Disabled Jack

I'd love to use Java 8 features, but Jack just isn't ready yet.

app/build.gradle

@@ -20,11 +20,11 @@ android {
         targetSdkVersion 25
         versionCode 9
         versionName "1.0-beta9"
-        jackOptions.enabled = true
+        jackOptions.enabled = false
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_1_7
-        targetCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_7
     }
     buildTypes {
         release {

app/src/main/java/ch/dissem/apps/abit/AbstractItemListFragment.java

@@ -37,8 +37,13 @@ public abstract class AbstractItemListFragment<T> extends ListFragment implement
      * A dummy implementation of the {@link ListSelectionListener} interface that does
      * nothing. Used only when this fragment is not attached to an activity.
      */
-    private static final ListSelectionListener<Object> dummyCallbacks = plaintext -> {
+    private static final ListSelectionListener<Object> dummyCallbacks =
-    };
+        new ListSelectionListener<Object>() {
+            @Override
+            public void onItemSelected(Object item) {
+                // NO OP
+            }
+        };
     /**
      * The fragment's current callback object, which is notified of list item
      * clicks.

app/src/main/java/ch/dissem/apps/abit/AddressDetailFragment.java

@@ -18,6 +18,7 @@ package ch.dissem.apps.abit;
 
 import android.app.Activity;
 import android.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.os.Bundle;
@@ -31,6 +32,7 @@ import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.CompoundButton;
 import android.widget.ImageView;
 import android.widget.Switch;
 import android.widget.TextView;
@@ -137,14 +139,17 @@ public class AddressDetailFragment extends Fragment {
                     warning = R.string.delete_contact_warning;
                 new AlertDialog.Builder(ctx)
                     .setMessage(warning)
-                    .setPositiveButton(android.R.string.yes, (dialog, which) -> {
+                    .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
-                        Singleton.getAddressRepository(ctx).remove(item);
+                        @Override
-                        MainActivity mainActivity = MainActivity.getInstance();
+                        public void onClick(DialogInterface dialog, int which) {
-                        if (item.getPrivateKey() != null && mainActivity != null) {
+                            Singleton.getAddressRepository(ctx).remove(item);
-                            mainActivity.removeIdentityEntry(item);
+                            MainActivity mainActivity = MainActivity.getInstance();
+                            if (item.getPrivateKey() != null && mainActivity != null) {
+                                mainActivity.removeIdentityEntry(item);
+                            }
+                            item = null;
+                            ctx.onBackPressed();
                         }
-                        item = null;
-                        ctx.onBackPressed();
                     })
                     .setNegativeButton(android.R.string.no, null)
                     .show();
@@ -153,17 +158,20 @@ public class AddressDetailFragment extends Fragment {
             case R.id.export: {
                 new AlertDialog.Builder(ctx)
                     .setMessage(R.string.confirm_export)
-                    .setPositiveButton(android.R.string.yes, (dialog, which) -> {
+                    .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
-                        Intent shareIntent = new Intent(Intent.ACTION_SEND);
+                        @Override
-                        shareIntent.setType("text/plain");
+                        public void onClick(DialogInterface dialog, int which) {
-                        shareIntent.putExtra(Intent.EXTRA_TITLE, item +
+                            Intent shareIntent = new Intent(Intent.ACTION_SEND);
-                            EXPORT_POSTFIX);
+                            shareIntent.setType("text/plain");
-                        WifExporter exporter = new WifExporter(Singleton
+                            shareIntent.putExtra(Intent.EXTRA_TITLE, item +
-                            .getBitmessageContext(ctx));
+                                EXPORT_POSTFIX);
-                        exporter.addIdentity(item);
+                            WifExporter exporter = new WifExporter(Singleton
-                        shareIntent.putExtra(Intent.EXTRA_TEXT, exporter.toString
+                                .getBitmessageContext(ctx));
-                            ());
+                            exporter.addIdentity(item);
-                        startActivity(Intent.createChooser(shareIntent, null));
+                            shareIntent.putExtra(Intent.EXTRA_TEXT, exporter.toString
+                                ());
+                            startActivity(Intent.createChooser(shareIntent, null));
+                        }
                     })
                     .setNegativeButton(android.R.string.no, null)
                     .show();
@@ -225,8 +233,12 @@ public class AddressDetailFragment extends Fragment {
             if (item.getPrivateKey() == null) {
                 Switch active = (Switch) rootView.findViewById(R.id.active);
                 active.setChecked(item.isSubscribed());
-                active.setOnCheckedChangeListener((buttonView, isChecked) ->
+                active.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
-                    item.setSubscribed(isChecked));
+                    @Override
+                    public void onCheckedChanged(CompoundButton button, boolean checked) {
+                        item.setSubscribed(checked);
+                    }
+                });
 
                 ImageView pubkeyAvailableImg = (ImageView) rootView.findViewById(R.id
                     .pubkey_available);

app/src/main/java/ch/dissem/apps/abit/AddressListFragment.java

@@ -33,6 +33,7 @@ import android.widget.TextView;
 import com.google.zxing.integration.android.IntentIntegrator;
 
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.List;
 
 import ch.dissem.apps.abit.listener.ActionBarListener;
@@ -56,28 +57,31 @@ public class AddressListFragment extends AbstractItemListFragment<BitmessageAddr
     public void updateList() {
         List<BitmessageAddress> addresses = Singleton.getAddressRepository(getContext())
             .getContacts();
-        Collections.sort(addresses, (lhs, rhs) -> {
+        Collections.sort(addresses, new Comparator<BitmessageAddress>() {
-            // Yields the following order:
+            @Override
-            // * Subscribed addresses come first
+            public int compare(BitmessageAddress lhs, BitmessageAddress rhs) {
-            // * Addresses with Aliases (alphabetically)
+                // Yields the following order:
-            // * Addresses (alphabetically)
+                // * Subscribed addresses come first
-            if (lhs.isSubscribed() == rhs.isSubscribed()) {
+                // * Addresses with Aliases (alphabetically)
-                if (lhs.getAlias() != null) {
+                // * Addresses (alphabetically)
-                    if (rhs.getAlias() != null) {
+                if (lhs.isSubscribed() == rhs.isSubscribed()) {
-                        return lhs.getAlias().compareTo(rhs.getAlias());
+                    if (lhs.getAlias() != null) {
+                        if (rhs.getAlias() != null) {
+                            return lhs.getAlias().compareTo(rhs.getAlias());
+                        } else {
+                            return -1;
+                        }
+                    } else if (rhs.getAlias() != null) {
+                        return 1;
                     } else {
-                        return -1;
+                        return lhs.getAddress().compareTo(rhs.getAddress());
                     }
-                } else if (rhs.getAlias() != null) {
-                    return 1;
-                } else {
-                    return lhs.getAddress().compareTo(rhs.getAddress());
                 }
-            }
+                if (lhs.isSubscribed()) {
-            if (lhs.isSubscribed()) {
+                    return -1;
-                return -1;
+                } else {
-            } else {
+                    return 1;
-                return 1;
+                }
             }
         });
         setListAdapter(new ArrayAdapter<BitmessageAddress>(

app/src/main/java/ch/dissem/apps/abit/ComposeMessageFragment.java

@@ -96,7 +96,12 @@ public class ComposeMessageFragment extends Fragment {
             final ContactAdapter adapter = new ContactAdapter(getContext());
             recipientInput.setAdapter(adapter);
             recipientInput.setOnItemClickListener(
-                (parent, view, position, id) -> recipient = adapter.getItem(position)
+                new AdapterView.OnItemClickListener() {
+                    @Override
+                    public void onItemClick(AdapterView<?> parent, View view, int pos, long id) {
+                        adapter.getItem(pos);
+                    }
+                }
             );
             recipientInput.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                 @Override

app/src/main/java/ch/dissem/apps/abit/CreateAddressActivity.java

@@ -20,6 +20,7 @@ import android.app.Activity;
 import android.net.Uri;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
+import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Switch;
@@ -60,28 +61,34 @@ public class CreateAddressActivity extends AppCompatActivity {
         }
 
         final Button cancel = (Button) findViewById(R.id.cancel);
-        cancel.setOnClickListener(v -> {
+        cancel.setOnClickListener(new View.OnClickListener() {
-            setResult(Activity.RESULT_CANCELED);
+            @Override
-            finish();
+            public void onClick(View view) {
+                setResult(Activity.RESULT_CANCELED);
+                finish();
+            }
         });
         final Button ok = (Button) findViewById(R.id.do_import);
-        ok.setOnClickListener(v -> {
+        ok.setOnClickListener(new View.OnClickListener() {
-            String addressText = String.valueOf(address.getText()).trim();
+            @Override
-            try {
+            public void onClick(View view) {
-                BitmessageAddress bmAddress = new BitmessageAddress(addressText);
+                String addressText = String.valueOf(address.getText()).trim();
-                bmAddress.setAlias(label.getText().toString());
+                try {
+                    BitmessageAddress bmAddress = new BitmessageAddress(addressText);
+                    bmAddress.setAlias(label.getText().toString());
 
-                BitmessageContext bmc = Singleton.getBitmessageContext
+                    BitmessageContext bmc = Singleton.getBitmessageContext
-                    (CreateAddressActivity.this);
+                        (CreateAddressActivity.this);
-                bmc.addContact(bmAddress);
+                    bmc.addContact(bmAddress);
-                if (subscribe.isChecked()) {
+                    if (subscribe.isChecked()) {
-                    bmc.addSubscribtion(bmAddress);
+                        bmc.addSubscribtion(bmAddress);
+                    }
+
+                    setResult(Activity.RESULT_OK);
+                    finish();
+                } catch (RuntimeException e) {
+                    address.setError(getString(R.string.error_illegal_address));
                 }
-
-                setResult(Activity.RESULT_OK);
-                finish();
-            } catch (RuntimeException e) {
-                address.setError(getString(R.string.error_illegal_address));
             }
         });
     }

app/src/main/java/ch/dissem/apps/abit/ImportIdentitiesFragment.java

@@ -67,15 +67,18 @@ public class ImportIdentitiesFragment extends Fragment {
         } catch (IOException e) {
             return super.onCreateView(inflater, container, savedInstanceState);
         }
-        view.findViewById(R.id.finish).setOnClickListener(v -> {
+        view.findViewById(R.id.finish).setOnClickListener(new View.OnClickListener() {
-            importer.importAll(adapter.getSelected());
+            @Override
-            MainActivity mainActivity = MainActivity.getInstance();
+            public void onClick(View view) {
-            if (mainActivity != null) {
+                importer.importAll(adapter.getSelected());
-                for (BitmessageAddress selected : adapter.getSelected()) {
+                MainActivity mainActivity = MainActivity.getInstance();
-                    mainActivity.addIdentityEntry(selected);
+                if (mainActivity != null) {
+                    for (BitmessageAddress selected : adapter.getSelected()) {
+                        mainActivity.addIdentityEntry(selected);
+                    }
                 }
+                getActivity().finish();
             }
-            getActivity().finish();
         });
         return view;
     }

app/src/main/java/ch/dissem/apps/abit/InputWifFragment.java

@@ -28,6 +28,7 @@ import android.view.ViewGroup;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.github.angads25.filepicker.controller.DialogSelectionListener;
 import com.github.angads25.filepicker.model.DialogConfigs;
 import com.github.angads25.filepicker.model.DialogProperties;
 import com.github.angads25.filepicker.view.FilePickerDialog;
@@ -60,16 +61,19 @@ public class InputWifFragment extends Fragment {
         View view = inflater.inflate(R.layout.fragment_import_input, container, false);
         wifData = (TextView) view.findViewById(R.id.wif_input);
 
-        view.findViewById(R.id.next).setOnClickListener(v -> {
+        view.findViewById(R.id.next).setOnClickListener(new View.OnClickListener() {
-            Bundle bundle = new Bundle();
+            @Override
-            bundle.putString(WIF_DATA, wifData.getText().toString());
+            public void onClick(View view) {
+                Bundle bundle = new Bundle();
+                bundle.putString(WIF_DATA, wifData.getText().toString());
 
-            ImportIdentitiesFragment fragment = new ImportIdentitiesFragment();
+                ImportIdentitiesFragment fragment = new ImportIdentitiesFragment();
-            fragment.setArguments(bundle);
+                fragment.setArguments(bundle);
 
-            getFragmentManager().beginTransaction()
+                getFragmentManager().beginTransaction()
-                .replace(R.id.content, fragment)
+                    .replace(R.id.content, fragment)
-                .commit();
+                    .commit();
+            }
         });
         return view;
     }
@@ -89,23 +93,26 @@ public class InputWifFragment extends Fragment {
         properties.extensions = null;
         FilePickerDialog dialog = new FilePickerDialog(getActivity(), properties);
         dialog.setTitle(getString(R.string.select_file_title));
-        dialog.setDialogSelectionListener(files -> {
+        dialog.setDialogSelectionListener(new DialogSelectionListener() {
-            if (files.length > 0) {
+            @Override
-                try (InputStream in = new FileInputStream(files[0])) {
+            public void onSelectedFilePaths(String[] files) {
-                    ByteArrayOutputStream data = new ByteArrayOutputStream();
+                if (files.length > 0) {
-                    byte[] buffer = new byte[1024];
+                    try (InputStream in = new FileInputStream(files[0])) {
-                    int length;
+                        ByteArrayOutputStream data = new ByteArrayOutputStream();
-                    //noinspection ConstantConditions
+                        byte[] buffer = new byte[1024];
-                    while ((length = in.read(buffer)) != -1) {
+                        int length;
-                        data.write(buffer, 0, length);
+                        //noinspection ConstantConditions
+                        while ((length = in.read(buffer)) != -1) {
+                            data.write(buffer, 0, length);
+                        }
+                        wifData.setText(data.toString("UTF-8"));
+                    } catch (IOException e) {
+                        Toast.makeText(
+                            getActivity(),
+                            R.string.error_loading_data,
+                            Toast.LENGTH_SHORT
+                        ).show();
                     }
-                    wifData.setText(data.toString("UTF-8"));
-                } catch (IOException e) {
-                    Toast.makeText(
-                        getActivity(),
-                        R.string.error_loading_data,
-                        Toast.LENGTH_SHORT
-                    ).show();
                 }
             }
         });

app/src/main/java/ch/dissem/apps/abit/MainActivity.java

@@ -24,10 +24,12 @@ import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.CompoundButton;
 import android.widget.RelativeLayout;
 import android.widget.Toast;
 
 import com.github.amlcurran.showcaseview.ShowcaseView;
+import com.github.amlcurran.showcaseview.targets.Target;
 import com.mikepenz.community_material_typeface_library.CommunityMaterial;
 import com.mikepenz.google_material_typeface_library.GoogleMaterial;
 import com.mikepenz.iconics.IconicsDrawable;
@@ -35,6 +37,7 @@ import com.mikepenz.materialdrawer.AccountHeader;
 import com.mikepenz.materialdrawer.AccountHeaderBuilder;
 import com.mikepenz.materialdrawer.Drawer;
 import com.mikepenz.materialdrawer.DrawerBuilder;
+import com.mikepenz.materialdrawer.interfaces.OnCheckedChangeListener;
 import com.mikepenz.materialdrawer.model.DividerDrawerItem;
 import com.mikepenz.materialdrawer.model.PrimaryDrawerItem;
 import com.mikepenz.materialdrawer.model.ProfileDrawerItem;
@@ -182,13 +185,16 @@ public class MainActivity extends AppCompatActivity
                 .setStyle(R.style.CustomShowcaseTheme)
                 .setContentTitle(R.string.full_node)
                 .setContentText(R.string.full_node_description)
-                .setTarget(() -> {
+                .setTarget(new Target() {
-                    View view = drawer.getStickyFooter();
+                    @Override
-                    int[] location = new int[2];
+                    public Point getPoint() {
-                    view.getLocationInWindow(location);
+                        View view = drawer.getStickyFooter();
-                    int x = location[0] + 7 * view.getWidth() / 8;
+                        int[] location = new int[2];
-                    int y = location[1] + view.getHeight() / 2;
+                        view.getLocationInWindow(location);
-                    return new Point(x, y);
+                        int x = location[0] + 7 * view.getWidth() / 8;
+                        int y = location[1] + view.getHeight() / 2;
+                        return new Point(x, y);
+                    }
                 })
                 .replaceEndButton(R.layout.showcase_button)
                 .hideOnTouchOutside()
@@ -246,32 +252,36 @@ public class MainActivity extends AppCompatActivity
             .withActivity(this)
             .withHeaderBackground(R.drawable.header)
             .withProfiles(profiles)
-            .withOnAccountHeaderListener((view, profile, currentProfile) -> {
+            .withOnAccountHeaderListener(new AccountHeader.OnAccountHeaderListener() {
-                switch ((int) profile.getIdentifier()) {
+                @Override
-                    case ADD_IDENTITY:
+                public boolean onProfileChanged(View view, IProfile profile, boolean current) {
-                        addIdentityDialog();
+                    switch ((int) profile.getIdentifier()) {
-                        break;
+                        case ADD_IDENTITY:
-                    case MANAGE_IDENTITY:
+                            addIdentityDialog();
-                        BitmessageAddress identity = Singleton.getIdentity(this);
+                            break;
-                        if (identity == null) {
+                        case MANAGE_IDENTITY:
-                            Toast.makeText(this, R.string.no_identity_warning, LENGTH_LONG).show();
+                            BitmessageAddress identity = Singleton.getIdentity(MainActivity.this);
-                        } else {
+                            if (identity == null) {
-                            Intent show = new Intent(MainActivity.this,
+                                Toast.makeText(MainActivity.this,
-                                AddressDetailActivity.class);
+                                    R.string.no_identity_warning, LENGTH_LONG).show();
-                            show.putExtra(AddressDetailFragment.ARG_ITEM, identity);
+                            } else {
-                            startActivity(show);
+                                Intent show = new Intent(MainActivity.this,
-                        }
+                                    AddressDetailActivity.class);
-                        break;
+                                show.putExtra(AddressDetailFragment.ARG_ITEM, identity);
-                    default:
+                                startActivity(show);
-                        if (profile instanceof ProfileDrawerItem) {
-                            Object tag = ((ProfileDrawerItem) profile).getTag();
-                            if (tag instanceof BitmessageAddress) {
-                                Singleton.setIdentity((BitmessageAddress) tag);
                             }
-                        }
+                            break;
+                        default:
+                            if (profile instanceof ProfileDrawerItem) {
+                                Object tag = ((ProfileDrawerItem) profile).getTag();
+                                if (tag instanceof BitmessageAddress) {
+                                    Singleton.setIdentity((BitmessageAddress) tag);
+                                }
+                            }
+                    }
+                    // false if it should close the drawer
+                    return false;
                 }
-                // false if it should close the drawer
-                return false;
             })
             .build();
         if (profiles.size() > 2) { // There's always the add and manage identity items
@@ -333,11 +343,15 @@ public class MainActivity extends AppCompatActivity
             .withName(R.string.full_node)
             .withIcon(CommunityMaterial.Icon.cmd_cloud_outline)
             .withChecked(isRunning())
-            .withOnCheckedChangeListener((drawerItem, buttonView, isChecked) -> {
+            .withOnCheckedChangeListener(new OnCheckedChangeListener() {
-                if (isChecked) {
+                @Override
-                    checkAndStartNode();
+                public void onCheckedChanged(IDrawerItem drawerItem, CompoundButton buttonView,
-                } else {
+                                             boolean isChecked) {
-                    stopService(new Intent(this, BitmessageService.class));
+                    if (isChecked) {
+                        checkAndStartNode();
+                    } else {
+                        stopService(new Intent(MainActivity.this, BitmessageService.class));
+                    }
                 }
             });
 
@@ -347,36 +361,39 @@ public class MainActivity extends AppCompatActivity
             .withAccountHeader(accountHeader)
             .withDrawerItems(drawerItems)
             .addStickyDrawerItems(nodeSwitch)
-            .withOnDrawerItemClickListener((view, position, item) -> {
+            .withOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
-                if (item.getTag() instanceof Label) {
+                @Override
-                    selectedLabel = (Label) item.getTag();
+                public boolean onItemClick(View view, int position, IDrawerItem item) {
-                    showSelectedLabel();
+                    if (item.getTag() instanceof Label) {
-                    return false;
+                        selectedLabel = (Label) item.getTag();
-                } else if (item instanceof Nameable<?>) {
+                        showSelectedLabel();
-                    Nameable<?> ni = (Nameable<?>) item;
+                        return false;
-                    switch (ni.getName().getTextRes()) {
+                    } else if (item instanceof Nameable<?>) {
-                        case R.string.contacts_and_subscriptions:
+                        Nameable<?> ni = (Nameable<?>) item;
-                            if (!(getSupportFragmentManager().findFragmentById(R.id
+                        switch (ni.getName().getTextRes()) {
-                                .item_list) instanceof AddressListFragment)) {
+                            case R.string.contacts_and_subscriptions:
-                                changeList(new AddressListFragment());
+                                if (!(getSupportFragmentManager().findFragmentById(R.id
-                            } else {
+                                    .item_list) instanceof AddressListFragment)) {
-                                ((AddressListFragment) getSupportFragmentManager()
+                                    changeList(new AddressListFragment());
-                                    .findFragmentById(R.id.item_list)).updateList();
+                                } else {
-                            }
+                                    ((AddressListFragment) getSupportFragmentManager()
-                            break;
+                                        .findFragmentById(R.id.item_list)).updateList();
-                        case R.string.settings:
+                                }
-                            startActivity(new Intent(MainActivity.this, SettingsActivity
+                                break;
-                                .class));
+                            case R.string.settings:
-                            break;
+                                startActivity(new Intent(MainActivity.this, SettingsActivity
-                        case R.string.archive:
+                                    .class));
-                            selectedLabel = null;
+                                break;
-                            showSelectedLabel();
+                            case R.string.archive:
-                            break;
+                                selectedLabel = null;
-                        case R.string.full_node:
+                                showSelectedLabel();
-                            return true;
+                                break;
+                            case R.string.full_node:
+                                return true;
+                        }
                     }
+                    return false;
                 }
-                return false;
             })
             .withShowDrawerOnFirstLaunch(true)
             .build();
@@ -461,11 +478,14 @@ public class MainActivity extends AppCompatActivity
     }
 
     public static void updateNodeSwitch() {
-        MainActivity i = getInstance();
+        final MainActivity i = getInstance();
         if (i != null) {
-            i.runOnUiThread(() -> {
+            i.runOnUiThread(new Runnable() {
-                i.nodeSwitch.withChecked(i.bmc.isRunning());
+                @Override
-                i.drawer.updateStickyFooterItem(i.nodeSwitch);
+                public void run() {
+                    i.nodeSwitch.withChecked(i.bmc.isRunning());
+                    i.drawer.updateStickyFooterItem(i.nodeSwitch);
+                }
             });
         }
     }

app/src/main/java/ch/dissem/apps/abit/MessageDetailFragment.java

@@ -31,6 +31,7 @@ import android.widget.TextView;
 import com.mikepenz.google_material_typeface_library.GoogleMaterial;
 
 import java.util.Iterator;
+import java.util.regex.Matcher;
 
 import ch.dissem.apps.abit.listener.ActionBarListener;
 import ch.dissem.apps.abit.service.Singleton;
@@ -110,7 +111,12 @@ public class MessageDetailFragment extends Fragment {
 
             Linkify.addLinks(messageBody, WEB_URLS);
             Linkify.addLinks(messageBody, BITMESSAGE_ADDRESS_PATTERN, BITMESSAGE_URL_SCHEMA, null,
-                (match, url) -> match.group()
+                new Linkify.TransformFilter() {
+                    @Override
+                    public String transformUrl(Matcher match, String url) {
+                        return match.group();
+                    }
+                }
             );
 
             messageBody.setLinksClickable(true);

app/src/main/java/ch/dissem/apps/abit/SettingsFragment.java

@@ -46,21 +46,27 @@ public class SettingsFragment
         addPreferencesFromResource(R.xml.preferences);
 
         Preference about = findPreference("about");
-        about.setOnPreferenceClickListener(preference -> {
+        about.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
-            new LibsBuilder()
+            @Override
-                .withActivityTitle(getActivity().getString(R.string.about))
+            public boolean onPreferenceClick(Preference preference) {
-                .withActivityStyle(Libs.ActivityStyle.LIGHT_DARK_TOOLBAR)
+                new LibsBuilder()
-                .withAboutIconShown(true)
+                    .withActivityTitle(getActivity().getString(R.string.about))
-                .withAboutVersionShown(true)
+                    .withActivityStyle(Libs.ActivityStyle.LIGHT_DARK_TOOLBAR)
-                .withAboutDescription(getString(R.string.about_app))
+                    .withAboutIconShown(true)
-                .start(getActivity());
+                    .withAboutVersionShown(true)
-            return true;
+                    .withAboutDescription(getString(R.string.about_app))
+                    .start(getActivity());
+                return true;
+            }
         });
 
         Preference status = findPreference("status");
-        status.setOnPreferenceClickListener(preference -> {
+        status.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
-            startActivity(new Intent(getActivity(), StatusActivity.class));
+            @Override
-            return true;
+            public boolean onPreferenceClick(Preference preference) {
+                startActivity(new Intent(getActivity(), StatusActivity.class));
+                return true;
+            }
         });
     }
 

app/src/main/java/ch/dissem/apps/abit/adapter/AddressSelectorAdapter.java

@@ -21,6 +21,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.CheckBox;
+import android.widget.CompoundButton;
 import android.widget.TextView;
 
 import java.util.ArrayList;
@@ -75,9 +76,12 @@ public class AddressSelectorAdapter
             super(v);
             checkbox = (CheckBox) v.findViewById(R.id.checkbox);
             address = (TextView) v.findViewById(R.id.address);
-            checkbox.setOnCheckedChangeListener((buttonView, isChecked) -> {
+            checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
-                if (data != null) {
+                @Override
-                    data.selected = isChecked;
+                public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
+                    if (data != null) {
+                        data.selected = isChecked;
+                    }
                 }
             });
         }

app/src/main/java/ch/dissem/apps/abit/adapter/SwipeableMessageAdapter.java

@@ -105,8 +105,18 @@ public class SwipeableMessageAdapter
     }
 
     public SwipeableMessageAdapter() {
-        itemViewOnClickListener = this::onItemViewClick;
+        itemViewOnClickListener = new View.OnClickListener() {
-        swipeableViewContainerOnClickListener = this::onSwipeableViewContainerClick;
+            @Override
+            public void onClick(View view) {
+                onItemViewClick(view);
+            }
+        };
+        swipeableViewContainerOnClickListener = new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                onSwipeableViewContainerClick(view);
+            }
+        };
 
         // SwipeableItemAdapter requires stable ID, and also
         // have to implement the getItemId() method appropriately.

app/src/main/java/ch/dissem/apps/abit/dialog/AddIdentityDialogFragment.java

@@ -19,6 +19,7 @@ package ch.dissem.apps.abit.dialog;
 import android.annotation.SuppressLint;
 import android.app.AlertDialog;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.AsyncTask;
 import android.os.Bundle;
@@ -60,47 +61,55 @@ public class AddIdentityDialogFragment extends AppCompatDialogFragment {
         getDialog().setTitle(R.string.add_identity);
         View view = inflater.inflate(R.layout.dialog_add_identity, container, false);
         final RadioGroup radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
-        view.findViewById(R.id.ok).setOnClickListener(v -> {
+        view.findViewById(R.id.ok).setOnClickListener(new View.OnClickListener() {
-            final Context ctx = getActivity().getBaseContext();
+            @Override
-            switch (radioGroup.getCheckedRadioButtonId()) {
+            public void onClick(View view) {
-                case R.id.create_identity:
+                final Context ctx = getActivity().getBaseContext();
-                    Toast.makeText(ctx,
+                switch (radioGroup.getCheckedRadioButtonId()) {
-                        R.string.toast_long_running_operation,
+                    case R.id.create_identity:
-                        Toast.LENGTH_SHORT).show();
+                        Toast.makeText(ctx,
-                    new AsyncTask<Void, Void, BitmessageAddress>() {
+                            R.string.toast_long_running_operation,
-                        @Override
+                            Toast.LENGTH_SHORT).show();
-                        protected BitmessageAddress doInBackground(Void... args) {
+                        new AsyncTask<Void, Void, BitmessageAddress>() {
-                            return bmc.createIdentity(false, Pubkey.Feature.DOES_ACK);
+                            @Override
-                        }
+                            protected BitmessageAddress doInBackground(Void... args) {
-
+                                return bmc.createIdentity(false, Pubkey.Feature.DOES_ACK);
-                        @Override
-                        protected void onPostExecute(BitmessageAddress chan) {
-                            Toast.makeText(ctx,
-                                R.string.toast_identity_created,
-                                Toast.LENGTH_SHORT).show();
-                            MainActivity mainActivity = MainActivity.getInstance();
-                            if (mainActivity != null) {
-                                mainActivity.addIdentityEntry(chan);
                             }
-                        }
+
-                    }.execute();
+                            @Override
-                    break;
+                            protected void onPostExecute(BitmessageAddress chan) {
-                case R.id.import_identity:
+                                Toast.makeText(ctx,
-                    startActivity(new Intent(ctx, ImportIdentityActivity.class));
+                                    R.string.toast_identity_created,
-                    break;
+                                    Toast.LENGTH_SHORT).show();
-                case R.id.add_chan:
+                                MainActivity mainActivity = MainActivity.getInstance();
-                    addChanDialog();
+                                if (mainActivity != null) {
-                    break;
+                                    mainActivity.addIdentityEntry(chan);
-                case R.id.add_deterministic_address:
+                                }
-                    new DeterministicIdentityDialogFragment().show(getFragmentManager(),
+                            }
-                        "dialog");
+                        }.execute();
-                    break;
+                        break;
-                default:
+                    case R.id.import_identity:
-                    return;
+                        startActivity(new Intent(ctx, ImportIdentityActivity.class));
+                        break;
+                    case R.id.add_chan:
+                        addChanDialog();
+                        break;
+                    case R.id.add_deterministic_address:
+                        new DeterministicIdentityDialogFragment().show(getFragmentManager(),
+                            "dialog");
+                        break;
+                    default:
+                        return;
+                }
+                dismiss();
+            }
+        });
+        view.findViewById(R.id.dismiss).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                dismiss();
             }
-            dismiss();
         });
-        view.findViewById(R.id.dismiss).setOnClickListener(v -> dismiss());
         return view;
     }
 
@@ -113,31 +122,34 @@ public class AddIdentityDialogFragment extends AppCompatDialogFragment {
         new AlertDialog.Builder(activity)
             .setTitle(R.string.add_chan)
             .setView(dialogView)
-            .setPositiveButton(R.string.ok, (dialogInterface, i) -> {
+            .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
-                TextView passphrase = (TextView) dialogView.findViewById(R.id.passphrase);
+                @Override
-                Toast.makeText(ctx, R.string.toast_long_running_operation,
+                public void onClick(DialogInterface dialogInterface, int i) {
-                    Toast.LENGTH_SHORT).show();
+                    TextView passphrase = (TextView) dialogView.findViewById(R.id.passphrase);
-                new AsyncTask<String, Void, BitmessageAddress>() {
+                    Toast.makeText(ctx, R.string.toast_long_running_operation,
-                    @Override
+                        Toast.LENGTH_SHORT).show();
-                    protected BitmessageAddress doInBackground(String... args) {
+                    new AsyncTask<String, Void, BitmessageAddress>() {
-                        String pass = args[0];
+                        @Override
-                        BitmessageAddress chan = bmc.createChan(pass);
+                        protected BitmessageAddress doInBackground(String... args) {
-                        chan.setAlias(pass);
+                            String pass = args[0];
-                        bmc.addresses().save(chan);
+                            BitmessageAddress chan = bmc.createChan(pass);
-                        return chan;
+                            chan.setAlias(pass);
-                    }
+                            bmc.addresses().save(chan);
-
+                            return chan;
-                    @Override
-                    protected void onPostExecute(BitmessageAddress chan) {
-                        Toast.makeText(ctx,
-                            R.string.toast_chan_created,
-                            Toast.LENGTH_SHORT).show();
-                        MainActivity mainActivity = MainActivity.getInstance();
-                        if (mainActivity != null) {
-                            mainActivity.addIdentityEntry(chan);
                         }
-                    }
+
-                }.execute(passphrase.getText().toString());
+                        @Override
+                        protected void onPostExecute(BitmessageAddress chan) {
+                            Toast.makeText(ctx,
+                                R.string.toast_chan_created,
+                                Toast.LENGTH_SHORT).show();
+                            MainActivity mainActivity = MainActivity.getInstance();
+                            if (mainActivity != null) {
+                                mainActivity.addIdentityEntry(chan);
+                            }
+                        }
+                    }.execute(passphrase.getText().toString());
+                }
             })
             .setNegativeButton(R.string.cancel, null)
             .show();

app/src/main/java/ch/dissem/apps/abit/dialog/DeterministicIdentityDialogFragment.java

@@ -56,68 +56,76 @@ public class DeterministicIdentityDialogFragment extends AppCompatDialogFragment
         getDialog().setTitle(R.string.add_deterministic_address);
         View view = inflater.inflate(R.layout.dialog_add_deterministic_identity, container, false);
         view.findViewById(R.id.ok)
-            .setOnClickListener(v -> {
+            .setOnClickListener(new View.OnClickListener() {
-                dismiss();
+                @Override
-                final Context context = getActivity().getBaseContext();
+                public void onClick(View view) {
-                View dialogView = getView();
+                    dismiss();
-                TextView label = (TextView) dialogView.findViewById(R.id.label);
+                    final Context context = getActivity().getBaseContext();
-                TextView passphrase = (TextView) dialogView.findViewById(R.id.passphrase);
+                    View dialogView = getView();
-                TextView numberOfAddresses = (TextView) dialogView.findViewById(R.id
+                    assert dialogView != null;
-                    .number_of_identities);
+                    TextView label = (TextView) dialogView.findViewById(R.id.label);
-                Switch shorter = (Switch) dialogView.findViewById(R.id.shorter);
+                    TextView passphrase = (TextView) dialogView.findViewById(R.id.passphrase);
+                    TextView numberOfAddresses = (TextView) dialogView.findViewById(R.id
+                        .number_of_identities);
+                    Switch shorter = (Switch) dialogView.findViewById(R.id.shorter);
 
-                Toast.makeText(context, R.string.toast_long_running_operation,
+                    Toast.makeText(context, R.string.toast_long_running_operation,
-                    Toast.LENGTH_SHORT).show();
+                        Toast.LENGTH_SHORT).show();
-                new AsyncTask<Object, Void, List<BitmessageAddress>>() {
+                    new AsyncTask<Object, Void, List<BitmessageAddress>>() {
-                    @Override
+                        @Override
-                    protected List<BitmessageAddress> doInBackground(Object... args) {
+                        protected List<BitmessageAddress> doInBackground(Object... args) {
-                        String label = (String) args[0];
+                            String label = (String) args[0];
-                        String pass = (String) args[1];
+                            String pass = (String) args[1];
-                        int numberOfAddresses = (int) args[2];
+                            int numberOfAddresses = (int) args[2];
-                        boolean shorter = (boolean) args[3];
+                            boolean shorter = (boolean) args[3];
-                        List<BitmessageAddress> identities = bmc.createDeterministicAddresses
+                            List<BitmessageAddress> identities = bmc.createDeterministicAddresses
-                            (pass,
+                                (pass,
-                                numberOfAddresses, Pubkey.LATEST_VERSION, 1L, shorter);
+                                    numberOfAddresses, Pubkey.LATEST_VERSION, 1L, shorter);
-                        int i = 0;
+                            int i = 0;
-                        for (BitmessageAddress identity : identities) {
-                            i++;
-                            if (identities.size() == 1) {
-                                identity.setAlias(label);
-                            } else {
-                                identity.setAlias(label + " (" + i + ")");
-                            }
-                            bmc.addresses().save(identity);
-                        }
-                        return identities;
-                    }
-
-                    @Override
-                    protected void onPostExecute(List<BitmessageAddress> identities) {
-                        int messageRes;
-                        if (identities.size() == 1) {
-                            messageRes = R.string.toast_identity_created;
-                        } else {
-                            messageRes = R.string.toast_identities_created;
-                        }
-                        Toast.makeText(context,
-                            messageRes,
-                            Toast.LENGTH_SHORT).show();
-                        MainActivity mainActivity = MainActivity.getInstance();
-                        if (mainActivity != null) {
                             for (BitmessageAddress identity : identities) {
-                                mainActivity.addIdentityEntry(identity);
+                                i++;
+                                if (identities.size() == 1) {
+                                    identity.setAlias(label);
+                                } else {
+                                    identity.setAlias(label + " (" + i + ")");
+                                }
+                                bmc.addresses().save(identity);
+                            }
+                            return identities;
+                        }
+
+                        @Override
+                        protected void onPostExecute(List<BitmessageAddress> identities) {
+                            int messageRes;
+                            if (identities.size() == 1) {
+                                messageRes = R.string.toast_identity_created;
+                            } else {
+                                messageRes = R.string.toast_identities_created;
+                            }
+                            Toast.makeText(context,
+                                messageRes,
+                                Toast.LENGTH_SHORT).show();
+                            MainActivity mainActivity = MainActivity.getInstance();
+                            if (mainActivity != null) {
+                                for (BitmessageAddress identity : identities) {
+                                    mainActivity.addIdentityEntry(identity);
+                                }
                             }
                         }
-                    }
+                    }.execute(
-                }.execute(
+                        label.getText().toString(),
-                    label.getText().toString(),
+                        passphrase.getText().toString(),
-                    passphrase.getText().toString(),
+                        Integer.valueOf(numberOfAddresses.getText().toString()),
-                    Integer.valueOf(numberOfAddresses.getText().toString()),
+                        shorter.isChecked()
-                    shorter.isChecked()
+                    );
-                );
+                }
             });
-        view.findViewById(R.id.dismiss)
+        view.findViewById(R.id.dismiss).setOnClickListener(new View.OnClickListener() {
-            .setOnClickListener(v -> dismiss());
+            @Override
+            public void onClick(View view) {
+                dismiss();
+            }
+        });
         return view;
     }
 

app/src/main/java/ch/dissem/apps/abit/dialog/FullNodeDialogActivity.java

@@ -19,6 +19,7 @@ package ch.dissem.apps.abit.dialog;
 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.View;
 
 import ch.dissem.apps.abit.R;
 import ch.dissem.apps.abit.service.BitmessageService;
@@ -34,11 +35,19 @@ public class FullNodeDialogActivity extends Activity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.dialog_full_node);
-        findViewById(R.id.ok).setOnClickListener(v -> {
+        findViewById(R.id.ok).setOnClickListener(new View.OnClickListener() {
-            startService(new Intent(this, BitmessageService.class));
+            @Override
-            updateNodeSwitch();
+            public void onClick(View view) {
-            finish();
+                startService(new Intent(FullNodeDialogActivity.this, BitmessageService.class));
+                updateNodeSwitch();
+                finish();
+            }
+        });
+        findViewById(R.id.dismiss).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                finish();
+            }
         });
-        findViewById(R.id.dismiss).setOnClickListener(v -> finish());
     }
 }

app/src/main/java/ch/dissem/apps/abit/listener/MessageListener.java

@@ -48,32 +48,38 @@ public class MessageListener implements BitmessageContext.Listener {
 
     @Override
     public void receive(final Plaintext plaintext) {
-        pool.submit(() -> {
+        pool.submit(new Runnable() {
-            unacknowledged.addFirst(plaintext);
+            @Override
-            numberOfUnacknowledgedMessages++;
+            public void run() {
-            if (unacknowledged.size() > 5) {
+                unacknowledged.addFirst(plaintext);
-                unacknowledged.removeLast();
+                numberOfUnacknowledgedMessages++;
-            }
+                if (unacknowledged.size() > 5) {
-            if (numberOfUnacknowledgedMessages == 1) {
+                    unacknowledged.removeLast();
-                notification.singleNotification(plaintext);
+                }
-            } else {
+                if (numberOfUnacknowledgedMessages == 1) {
-                notification.multiNotification(unacknowledged, numberOfUnacknowledgedMessages);
+                    notification.singleNotification(plaintext);
-            }
+                } else {
-            notification.show();
+                    notification.multiNotification(unacknowledged, numberOfUnacknowledgedMessages);
+                }
+                notification.show();
 
-            // If MainActivity is shown, update the sidebar badges
+                // If MainActivity is shown, update the sidebar badges
-            MainActivity main = MainActivity.getInstance();
+                MainActivity main = MainActivity.getInstance();
-            if (main != null) {
+                if (main != null) {
-                main.updateUnread();
+                    main.updateUnread();
+                }
             }
         });
     }
 
     public void resetNotification() {
-        pool.submit(() -> {
+        pool.submit(new Runnable() {
-            notification.hide();
+            @Override
-            unacknowledged.clear();
+            public void run() {
-            numberOfUnacknowledgedMessages = 0;
+                notification.hide();
+                unacknowledged.clear();
+                numberOfUnacknowledgedMessages = 0;
+            }
         });
     }
 }

app/src/main/java/ch/dissem/apps/abit/pow/ServerPowEngine.java

@@ -17,12 +17,14 @@
 package ch.dissem.apps.abit.pow;
 
 import android.content.Context;
+import android.support.annotation.NonNull;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
 
 import ch.dissem.apps.abit.service.Singleton;
 import ch.dissem.apps.abit.synchronization.SyncAdapter;
@@ -50,34 +52,40 @@ public class ServerPowEngine implements ProofOfWorkEngine, InternalContext
 
     public ServerPowEngine(Context ctx) {
         this.ctx = ctx;
-        pool = Executors.newCachedThreadPool(r -> {
+        pool = Executors.newCachedThreadPool(new ThreadFactory() {
-            Thread thread = Executors.defaultThreadFactory().newThread(r);
+            @Override
-            thread.setPriority(Thread.MIN_PRIORITY);
+            public Thread newThread(@NonNull Runnable r) {
-            return thread;
+                Thread thread = Executors.defaultThreadFactory().newThread(r);
+                thread.setPriority(Thread.MIN_PRIORITY);
+                return thread;
+            }
         });
     }
 
     @Override
     public void calculateNonce(final byte[] initialHash, final byte[] target, Callback callback) {
-        pool.execute(() -> {
+        pool.execute(new Runnable() {
-            BitmessageAddress identity = Singleton.getIdentity(ctx);
+            @Override
-            if (identity == null) throw new RuntimeException("No Identity for calculating POW");
+            public void run() {
+                BitmessageAddress identity = Singleton.getIdentity(ctx);
+                if (identity == null) throw new RuntimeException("No Identity for calculating POW");
 
-            ProofOfWorkRequest request = new ProofOfWorkRequest(identity, initialHash,
+                ProofOfWorkRequest request = new ProofOfWorkRequest(identity, initialHash,
-                CALCULATE, target);
+                    CALCULATE, target);
-            SyncAdapter.startPowSync(ctx);
+                SyncAdapter.startPowSync(ctx);
-            try {
+                try {
-                CryptoCustomMessage<ProofOfWorkRequest> cryptoMsg = new CryptoCustomMessage<>
+                    CryptoCustomMessage<ProofOfWorkRequest> cryptoMsg = new CryptoCustomMessage<>
-                    (request);
+                        (request);
-                cryptoMsg.signAndEncrypt(
+                    cryptoMsg.signAndEncrypt(
-                    identity,
+                        identity,
-                    cryptography().createPublicKey(identity.getPublicDecryptionKey())
+                        cryptography().createPublicKey(identity.getPublicDecryptionKey())
-                );
+                    );
-                context.getNetworkHandler().send(
+                    context.getNetworkHandler().send(
-                    Preferences.getTrustedNode(ctx), Preferences.getTrustedNodePort(ctx),
+                        Preferences.getTrustedNode(ctx), Preferences.getTrustedNodePort(ctx),
-                    cryptoMsg);
+                        cryptoMsg);
-            } catch (Exception e) {
+                } catch (Exception e) {
-                LOG.error(e.getMessage(), e);
+                    LOG.error(e.getMessage(), e);
+                }
             }
         });
     }

app/src/main/java/ch/dissem/apps/abit/service/ProofOfWorkService.java

@@ -92,23 +92,26 @@ public class ProofOfWorkService extends Service {
     }
 
     private void calculateNonce(final PowItem item) {
-        engine.calculateNonce(item.initialHash, item.targetValue, (initialHash, nonce) -> {
+        engine.calculateNonce(item.initialHash, item.targetValue, new ProofOfWorkEngine.Callback() {
-            try {
+            @Override
-                item.callback.onNonceCalculated(initialHash, nonce);
+            public void onNonceCalculated(byte[] initialHash, byte[] nonce) {
-            } finally {
+                try {
-                PowItem next;
+                    item.callback.onNonceCalculated(initialHash, nonce);
-                synchronized (queue) {
+                } finally {
-                    next = queue.poll();
+                    PowItem next;
-                    if (next == null) {
+                    synchronized (queue) {
-                        calculating = false;
+                        next = queue.poll();
-                        stopForeground(true);
+                        if (next == null) {
-                        stopSelf();
+                            calculating = false;
-                    } else {
+                            stopForeground(true);
-                        notification.update(queue.size()).show();
+                            stopSelf();
+                        } else {
+                            notification.update(queue.size()).show();
+                        }
+                    }
+                    if (next != null) {
+                        calculateNonce(next);
                     }
-                }
-                if (next != null) {
-                    calculateNonce(next);
                 }
             }
         });

app/src/main/java/ch/dissem/apps/abit/service/Singleton.java

@@ -110,9 +110,9 @@ public class Singleton {
         return powRepo;
     }
 
-    public static BitmessageAddress getIdentity(Context ctx) {
+    public static BitmessageAddress getIdentity(final Context ctx) {
         if (identity == null) {
-            BitmessageContext bmc = getBitmessageContext(ctx);
+            final BitmessageContext bmc = getBitmessageContext(ctx);
             synchronized (Singleton.class) {
                 if (identity == null) {
                     List<BitmessageAddress> identities = bmc.addresses()