Added swipe actions for messages.

- there is a minor layout problem on pre-Lollipop devices

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

@@ -28,7 +28,7 @@ import ch.dissem.bitmessage.entity.valueobject.Label;
 /**
  * @author Christian Basler
  */
-public abstract class AbstractItemListFragment<T> extends ListFragment {
+public abstract class AbstractItemListFragment<T> extends ListFragment implements ListHolder {
     /**
      * The serialization (saved instance state) Bundle key representing the
      * activated item position. Only used on tablets.
@@ -55,8 +55,6 @@ public abstract class AbstractItemListFragment<T> extends ListFragment {
     private int activatedPosition = ListView.INVALID_POSITION;
     private boolean activateOnItemClick;
 
-    abstract void updateList(Label label);
-
     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);

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

@@ -166,7 +166,7 @@ public class AddressListFragment extends AbstractItemListFragment<BitmessageAddr
     }
 
     @Override
-    void updateList(Label label) {
+    public void updateList(Label label) {
         updateList();
     }
 }

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

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2016 Christian Basler
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.dissem.apps.abit;
+
+import ch.dissem.bitmessage.entity.valueobject.Label;
+
+/**
+ * @author Christian Basler
+ */
+public interface ListHolder {
+    void updateList(Label label);
+
+    void setActivateOnItemClick(boolean activateOnItemClick);
+}

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

@@ -216,7 +216,7 @@ public class MainActivity extends AppCompatActivity
         }
     }
 
-    private void changeList(AbstractItemListFragment<?> listFragment) {
+    private <F extends Fragment & ListHolder> void changeList(F listFragment) {
         getSupportFragmentManager()
             .beginTransaction()
             .replace(R.id.item_list, listFragment)

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

@@ -204,7 +204,7 @@ public class MessageDetailFragment extends Fragment {
         }
     }
 
-    private boolean isInTrash(Plaintext item) {
+    public static boolean isInTrash(Plaintext item) {
         for (Label label : item.getLabels()) {
             if (label.getType() == Label.Type.TRASH) {
                 return true;

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

@@ -17,19 +17,29 @@
 package ch.dissem.apps.abit;
 
 import android.content.Intent;
-import android.graphics.Typeface;
 import android.os.Bundle;
 import android.support.design.widget.FloatingActionButton;
+import android.support.v4.app.Fragment;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.ArrayAdapter;
-import android.widget.ImageView;
-import android.widget.TextView;
 
+import com.h6ah4i.android.widget.advrecyclerview.animator.GeneralItemAnimator;
+import com.h6ah4i.android.widget.advrecyclerview.animator.SwipeDismissItemAnimator;
+import com.h6ah4i.android.widget.advrecyclerview.decoration.SimpleListDividerDecorator;
+import com.h6ah4i.android.widget.advrecyclerview.swipeable.RecyclerViewSwipeManager;
+import com.h6ah4i.android.widget.advrecyclerview.touchguard.RecyclerViewTouchActionGuardManager;
+import com.h6ah4i.android.widget.advrecyclerview.utils.WrapperAdapterUtils;
+
+import java.util.List;
+
+import ch.dissem.apps.abit.adapter.SwipeableMessageAdapter;
 import ch.dissem.apps.abit.listener.ActionBarListener;
 import ch.dissem.apps.abit.listener.ListSelectionListener;
 import ch.dissem.apps.abit.service.Singleton;
@@ -37,6 +47,8 @@ import ch.dissem.bitmessage.entity.Plaintext;
 import ch.dissem.bitmessage.entity.valueobject.Label;
 import ch.dissem.bitmessage.ports.MessageRepository;
 
+import static ch.dissem.apps.abit.MessageDetailFragment.isInTrash;
+
 /**
  * A list fragment representing a list of Messages. This fragment
  * also supports tablet devices by allowing list items to be given an
@@ -46,10 +58,19 @@ import ch.dissem.bitmessage.ports.MessageRepository;
  * Activities containing this fragment MUST implement the {@link ListSelectionListener}
  * interface.
  */
-public class MessageListFragment extends AbstractItemListFragment<Plaintext> {
+public class MessageListFragment extends Fragment implements ListHolder {
+
+    private RecyclerView recyclerView;
+    private RecyclerView.LayoutManager layoutManager;
+    private SwipeableMessageAdapter adapter;
+    private RecyclerView.Adapter wrappedAdapter;
+    private RecyclerViewSwipeManager recyclerViewSwipeManager;
+    private RecyclerViewTouchActionGuardManager recyclerViewTouchActionGuardManager;
 
     private Label currentLabel;
     private MenuItem emptyTrashMenuItem;
+    private MessageRepository messageRepo;
+    private List<Plaintext> messages;
 
     /**
      * Mandatory empty constructor for the fragment manager to instantiate the
@@ -68,8 +89,10 @@ public class MessageListFragment extends AbstractItemListFragment<Plaintext> {
     @Override
     public void onResume() {
         super.onResume();
+        MainActivity activity = (MainActivity) getActivity();
+        messageRepo = Singleton.getMessageRepository(activity);
 
-        doUpdateList(((MainActivity) getActivity()).getSelectedLabel());
+        doUpdateList(activity.getSelectedLabel());
     }
 
     @Override
@@ -82,34 +105,7 @@ public class MessageListFragment extends AbstractItemListFragment<Plaintext> {
     }
 
     private void doUpdateList(Label label) {
-        setListAdapter(new ArrayAdapter<Plaintext>(
+        messages = Singleton.getMessageRepository(getContext()).findMessages(label);
-                getActivity(),
-                android.R.layout.simple_list_item_activated_1,
-                android.R.id.text1,
-                Singleton.getMessageRepository(getContext()).findMessages(label)) {
-            @Override
-            public View getView(int position, View convertView, ViewGroup parent) {
-                if (convertView == null) {
-                    LayoutInflater inflater = LayoutInflater.from(getContext());
-                    convertView = inflater.inflate(R.layout.message_row, null, false);
-                }
-                Plaintext item = getItem(position);
-                ((ImageView) convertView.findViewById(R.id.avatar)).setImageDrawable(new Identicon(item.getFrom()));
-                TextView sender = (TextView) convertView.findViewById(R.id.sender);
-                sender.setText(item.getFrom().toString());
-                TextView subject = (TextView) convertView.findViewById(R.id.subject);
-                subject.setText(item.getSubject());
-                ((TextView) convertView.findViewById(R.id.text)).setText(item.getText());
-                if (item.isUnread()) {
-                    sender.setTypeface(Typeface.DEFAULT_BOLD);
-                    subject.setTypeface(Typeface.DEFAULT_BOLD);
-                } else {
-                    sender.setTypeface(Typeface.DEFAULT);
-                    subject.setTypeface(Typeface.DEFAULT);
-                }
-                return convertView;
-            }
-        });
         if (getActivity() instanceof ActionBarListener) {
             if (label != null) {
                 ((ActionBarListener) getActivity()).updateTitle(label.toString());
@@ -120,26 +116,127 @@ public class MessageListFragment extends AbstractItemListFragment<Plaintext> {
         if (emptyTrashMenuItem != null) {
             emptyTrashMenuItem.setVisible(label != null && label.getType() == Label.Type.TRASH);
         }
+        adapter.setData(label, messages);
+        adapter.notifyDataSetChanged();
     }
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
+        savedInstanceState) {
         View rootView = inflater.inflate(R.layout.fragment_message_list, container, false);
+        recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
+        layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
 
         // Show the dummy content as text in a TextView.
-        FloatingActionButton fab = (FloatingActionButton) rootView.findViewById(R.id.fab_compose_message);
+        FloatingActionButton fab = (FloatingActionButton) rootView.findViewById(R.id
+            .fab_compose_message);
         fab.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
-                Intent intent = new Intent(getActivity().getApplicationContext(), ComposeMessageActivity.class);
+                Intent intent = new Intent(getActivity().getApplicationContext(),
-                intent.putExtra(ComposeMessageActivity.EXTRA_IDENTITY, Singleton.getIdentity(getActivity()));
+                    ComposeMessageActivity.class);
+                intent.putExtra(ComposeMessageActivity.EXTRA_IDENTITY, Singleton.getIdentity
+                    (getActivity()));
                 startActivity(intent);
             }
         });
 
+        // touch guard manager  (this class is required to suppress scrolling while swipe-dismiss
+        // animation is running)
+        recyclerViewTouchActionGuardManager = new RecyclerViewTouchActionGuardManager();
+        recyclerViewTouchActionGuardManager.setInterceptVerticalScrollingWhileAnimationRunning
+            (true);
+        recyclerViewTouchActionGuardManager.setEnabled(true);
+
+        // swipe manager
+        recyclerViewSwipeManager = new RecyclerViewSwipeManager();
+
+        //adapter
+        adapter = new SwipeableMessageAdapter();
+        adapter.setEventListener(new SwipeableMessageAdapter.EventListener() {
+            @Override
+            public void onItemDeleted(Plaintext item) {
+                if (isInTrash(item)) {
+                    messageRepo.remove(item);
+                } else {
+                    item.getLabels().clear();
+                    item.addLabels(messageRepo.getLabels(Label.Type.TRASH));
+                    messageRepo.save(item);
+                }
+            }
+
+            @Override
+            public void onItemArchived(Plaintext item) {
+                item.getLabels().clear();
+                messageRepo.save(item);
+            }
+
+            @Override
+            public void onItemViewClicked(View v, boolean pinned) {
+                int position = recyclerView.getChildAdapterPosition(v);
+                if (position != RecyclerView.NO_POSITION) {
+                    Plaintext item = adapter.getItem(position);
+                    ((MainActivity) getActivity()).onItemSelected(item);
+                }
+            }
+        });
+
+        // wrap for swiping
+        wrappedAdapter = recyclerViewSwipeManager.createWrappedAdapter(adapter);
+
+        final GeneralItemAnimator animator = new SwipeDismissItemAnimator();
+
+        // Change animations are enabled by default since support-v7-recyclerview v22.
+        // Disable the change animation in order to make turning back animation of swiped item
+        // works properly.
+        animator.setSupportsChangeAnimations(false);
+
+        recyclerView.setLayoutManager(layoutManager);
+        recyclerView.setAdapter(wrappedAdapter);  // requires *wrapped* adapter
+        recyclerView.setItemAnimator(animator);
+
+        recyclerView.addItemDecoration(new SimpleListDividerDecorator(
+            ContextCompat.getDrawable(getContext(), R.drawable.list_divider_h), true));
+
+        // NOTE:
+        // The initialization order is very important! This order determines the priority of
+        // touch event handling.
+        //
+        // priority: TouchActionGuard > Swipe > DragAndDrop
+        recyclerViewTouchActionGuardManager.attachRecyclerView(recyclerView);
+        recyclerViewSwipeManager.attachRecyclerView(recyclerView);
+
         return rootView;
     }
 
+    @Override
+    public void onDestroyView() {
+        if (recyclerViewSwipeManager != null) {
+            recyclerViewSwipeManager.release();
+            recyclerViewSwipeManager = null;
+        }
+
+        if (recyclerViewTouchActionGuardManager != null) {
+            recyclerViewTouchActionGuardManager.release();
+            recyclerViewTouchActionGuardManager = null;
+        }
+
+        if (recyclerView != null) {
+            recyclerView.setItemAnimator(null);
+            recyclerView.setAdapter(null);
+            recyclerView = null;
+        }
+
+        if (wrappedAdapter != null) {
+            WrapperAdapterUtils.releaseAll(wrappedAdapter);
+            wrappedAdapter = null;
+        }
+        adapter = null;
+        layoutManager = null;
+
+        super.onDestroyView();
+    }
+
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.message_list, menu);
@@ -164,4 +261,8 @@ public class MessageListFragment extends AbstractItemListFragment<Plaintext> {
         }
     }
 
+    @Override
+    public void setActivateOnItemClick(boolean activateOnItemClick) {
+        // TODO
+    }
 }

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

@@ -0,0 +1,282 @@
+package ch.dissem.apps.abit.adapter;
+
+import android.graphics.Typeface;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.h6ah4i.android.widget.advrecyclerview.swipeable.SwipeableItemAdapter;
+import com.h6ah4i.android.widget.advrecyclerview.swipeable.SwipeableItemConstants;
+import com.h6ah4i.android.widget.advrecyclerview.swipeable.action.SwipeResultAction;
+import com.h6ah4i.android.widget.advrecyclerview.swipeable.action
+    .SwipeResultActionMoveToSwipedDirection;
+import com.h6ah4i.android.widget.advrecyclerview.swipeable.action.SwipeResultActionRemoveItem;
+import com.h6ah4i.android.widget.advrecyclerview.utils.AbstractSwipeableItemViewHolder;
+import com.h6ah4i.android.widget.advrecyclerview.utils.RecyclerViewAdapterUtils;
+
+import java.util.Collections;
+import java.util.List;
+
+import ch.dissem.apps.abit.Identicon;
+import ch.dissem.apps.abit.R;
+import ch.dissem.bitmessage.entity.Plaintext;
+import ch.dissem.bitmessage.entity.valueobject.Label;
+
+/**
+ * @author Christian Basler
+ */
+public class SwipeableMessageAdapter
+    extends RecyclerView.Adapter<SwipeableMessageAdapter.MyViewHolder>
+    implements SwipeableItemAdapter<SwipeableMessageAdapter.MyViewHolder>, SwipeableItemConstants {
+
+    private List<Plaintext> data = Collections.emptyList();
+    private EventListener eventListener;
+    private View.OnClickListener itemViewOnClickListener;
+    private View.OnClickListener swipeableViewContainerOnClickListener;
+
+    private Label label;
+
+    public interface EventListener {
+        void onItemDeleted(Plaintext item);
+
+        void onItemArchived(Plaintext item);
+
+        void onItemViewClicked(View v, boolean pinned);
+    }
+
+    public static class MyViewHolder extends AbstractSwipeableItemViewHolder {
+        public FrameLayout container;
+        public final ImageView avatar;
+        public final TextView sender;
+        public final TextView subject;
+        public final TextView extract;
+
+        public MyViewHolder(View v) {
+            super(v);
+            container = (FrameLayout) v.findViewById(R.id.container);
+            avatar = (ImageView) v.findViewById(R.id.avatar);
+            sender = (TextView) v.findViewById(R.id.sender);
+            subject = (TextView) v.findViewById(R.id.subject);
+            extract = (TextView) v.findViewById(R.id.text);
+        }
+
+        @Override
+        public View getSwipeableContainerView() {
+            return container;
+        }
+    }
+
+    public SwipeableMessageAdapter() {
+        itemViewOnClickListener = new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                onItemViewClick(v);
+            }
+        };
+        swipeableViewContainerOnClickListener = new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                onSwipeableViewContainerClick(v);
+            }
+        };
+
+        // SwipeableItemAdapter requires stable ID, and also
+        // have to implement the getItemId() method appropriately.
+        setHasStableIds(true);
+    }
+
+    public void setData(Label label, List<Plaintext> data) {
+        this.label = label;
+        this.data = data;
+    }
+
+    private void onItemViewClick(View v) {
+        if (eventListener != null) {
+            eventListener.onItemViewClicked(v, true); // pinned
+        }
+    }
+
+    private void onSwipeableViewContainerClick(View v) {
+        if (eventListener != null) {
+            eventListener.onItemViewClicked(
+                RecyclerViewAdapterUtils.getParentViewHolderItemView(v), false);  // not pinned
+        }
+    }
+
+    public Plaintext getItem(int position) {
+        return data.get(position);
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return (long) data.get(position).getId();
+    }
+
+    @Override
+    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
+        final View v = inflater.inflate(R.layout.message_row, parent, false);
+        return new MyViewHolder(v);
+    }
+
+    @Override
+    public void onBindViewHolder(MyViewHolder holder, int position) {
+        final Plaintext item = data.get(position);
+
+        // set listeners
+        // (if the item is *pinned*, click event comes to the itemView)
+        holder.itemView.setOnClickListener(itemViewOnClickListener);
+        // (if the item is *not pinned*, click event comes to the container)
+        holder.container.setOnClickListener(swipeableViewContainerOnClickListener);
+
+        // set data
+        holder.avatar.setImageDrawable(new Identicon(item.getFrom()));
+        holder.sender.setText(item.getFrom().toString());
+        holder.subject.setText(item.getSubject());
+        holder.extract.setText(item.getText());
+        if (item.isUnread()) {
+            holder.sender.setTypeface(Typeface.DEFAULT_BOLD);
+            holder.subject.setTypeface(Typeface.DEFAULT_BOLD);
+        } else {
+            holder.sender.setTypeface(Typeface.DEFAULT);
+            holder.subject.setTypeface(Typeface.DEFAULT);
+        }
+    }
+
+    @Override
+    public int getItemCount() {
+        return data.size();
+    }
+
+    @Override
+    public int onGetSwipeReactionType(MyViewHolder holder, int position, int x, int y) {
+        if (label == null) {
+            return REACTION_CAN_NOT_SWIPE_BOTH_H_WITH_RUBBER_BAND_EFFECT;
+        }
+        if (label.getType() == Label.Type.TRASH) {
+            return REACTION_CAN_SWIPE_LEFT | REACTION_CAN_NOT_SWIPE_RIGHT_WITH_RUBBER_BAND_EFFECT;
+        }
+        return REACTION_CAN_SWIPE_BOTH_H;
+    }
+
+    @Override
+    public void onSetSwipeBackground(MyViewHolder holder, int position, int type) {
+        int bgRes = 0;
+        if (label == null) {
+            bgRes = R.drawable.bg_swipe_item_neutral;
+        } else {
+            switch (type) {
+                case DRAWABLE_SWIPE_NEUTRAL_BACKGROUND:
+                    bgRes = R.drawable.bg_swipe_item_neutral;
+                    break;
+                case DRAWABLE_SWIPE_LEFT_BACKGROUND:
+                    bgRes = R.drawable.bg_swipe_item_left;
+                    break;
+                case DRAWABLE_SWIPE_RIGHT_BACKGROUND:
+                    if (label.getType() == Label.Type.TRASH) {
+                        bgRes = R.drawable.bg_swipe_item_neutral;
+                    } else {
+                        bgRes = R.drawable.bg_swipe_item_right;
+                    }
+                    break;
+            }
+        }
+        holder.itemView.setBackgroundResource(bgRes);
+    }
+
+    @Override
+    public SwipeResultAction onSwipeItem(MyViewHolder holder, final int position, int result) {
+        switch (result) {
+            // swipe right
+            case RESULT_SWIPED_RIGHT:
+                return new SwipeRightResultAction(this, position);
+            case RESULT_SWIPED_LEFT:
+                return new SwipeLeftResultAction(this, position);
+            // other --- do nothing
+            case RESULT_CANCELED:
+            default:
+                return null;
+        }
+    }
+
+    public void setEventListener(EventListener eventListener) {
+        this.eventListener = eventListener;
+    }
+
+    private static class SwipeLeftResultAction extends SwipeResultActionMoveToSwipedDirection {
+        private SwipeableMessageAdapter adapter;
+        private final int position;
+        private final Plaintext item;
+
+        SwipeLeftResultAction(SwipeableMessageAdapter adapter, int position) {
+            this.adapter = adapter;
+            this.position = position;
+            this.item = adapter.data.get(position);
+        }
+
+        @Override
+        protected void onPerformAction() {
+            super.onPerformAction();
+
+            adapter.data.remove(position);
+            adapter.notifyItemRemoved(position);
+        }
+
+        @Override
+        protected void onSlideAnimationEnd() {
+            super.onSlideAnimationEnd();
+
+            if (adapter.eventListener != null) {
+                adapter.eventListener.onItemDeleted(item);
+            }
+        }
+
+        @Override
+        protected void onCleanUp() {
+            super.onCleanUp();
+            // clear the references
+            adapter = null;
+        }
+    }
+
+    private static class SwipeRightResultAction extends SwipeResultActionRemoveItem {
+        private SwipeableMessageAdapter adapter;
+        private final int position;
+        private final Plaintext item;
+
+        SwipeRightResultAction(SwipeableMessageAdapter adapter, int position) {
+            this.adapter = adapter;
+            this.position = position;
+            this.item = adapter.data.get(position);
+        }
+
+        @Override
+        protected void onPerformAction() {
+            super.onPerformAction();
+
+            adapter.data.remove(position);
+            adapter.data.remove(position);
+            adapter.notifyItemRemoved(position);
+        }
+
+        @Override
+        protected void onSlideAnimationEnd() {
+            super.onSlideAnimationEnd();
+
+            if (adapter.eventListener != null) {
+                adapter.eventListener.onItemArchived(item);
+            }
+        }
+
+        @Override
+        protected void onCleanUp() {
+            super.onCleanUp();
+            // clear the references
+            adapter = null;
+        }
+    }
+}

app/src/main/java/ch/dissem/apps/abit/synchronization/SyncAdapter.java

@@ -28,6 +28,7 @@ import android.os.Bundle;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.util.List;
 
 import ch.dissem.apps.abit.service.Singleton;
@@ -35,6 +36,7 @@ import ch.dissem.apps.abit.util.Preferences;
 import ch.dissem.bitmessage.BitmessageContext;
 import ch.dissem.bitmessage.entity.BitmessageAddress;
 import ch.dissem.bitmessage.entity.CustomMessage;
+import ch.dissem.bitmessage.exception.DecryptionFailedException;
 import ch.dissem.bitmessage.extensions.CryptoCustomMessage;
 import ch.dissem.bitmessage.extensions.pow.ProofOfWorkRequest;
 import ch.dissem.bitmessage.ports.ProofOfWorkRepository;
@@ -68,18 +70,24 @@ public class SyncAdapter extends AbstractThreadedSyncAdapter {
     @Override
     public void onPerformSync(Account account, Bundle extras, String authority,
                               ContentProviderClient provider, SyncResult syncResult) {
-        if (account.equals(Authenticator.ACCOUNT_SYNC)) {
+        try {
-            if (Preferences.isConnectionAllowed(getContext())) {
+            if (account.equals(Authenticator.ACCOUNT_SYNC)) {
-                syncData();
+                if (Preferences.isConnectionAllowed(getContext())) {
+                    syncData();
+                }
+            } else if (account.equals(Authenticator.ACCOUNT_POW)) {
+                syncPOW();
+            } else {
+                syncResult.stats.numAuthExceptions++;
             }
-        } else if (account.equals(Authenticator.ACCOUNT_POW)) {
+        } catch (IOException e) {
-            syncPOW();
+            syncResult.stats.numIoExceptions++;
-        } else {
+        } catch (DecryptionFailedException e) {
-            throw new RuntimeException("Unknown " + account);
+            syncResult.stats.numAuthExceptions++;
         }
     }
 
-    private void syncData() {
+    private void syncData() throws IOException {
         // If the Bitmessage context acts as a full node, synchronization isn't necessary
         if (bmc.isRunning()) {
             LOG.info("Synchronization skipped, Abit is acting as a full node");
@@ -87,61 +95,53 @@ public class SyncAdapter extends AbstractThreadedSyncAdapter {
         }
         LOG.info("Synchronizing Bitmessage");
 
-        try {
+        LOG.info("Synchronization started");
-            LOG.info("Synchronization started");
+        bmc.synchronize(
-            bmc.synchronize(
+            Preferences.getTrustedNode(getContext()),
-                    Preferences.getTrustedNode(getContext()),
+            Preferences.getTrustedNodePort(getContext()),
-                    Preferences.getTrustedNodePort(getContext()),
+            Preferences.getTimeoutInSeconds(getContext()),
-                    Preferences.getTimeoutInSeconds(getContext()),
+            true);
-                    true);
+        LOG.info("Synchronization finished");
-            LOG.info("Synchronization finished");
-        } catch (RuntimeException e) {
-            LOG.error(e.getMessage(), e);
-        }
     }
 
-    private void syncPOW() {
+    private void syncPOW() throws IOException, DecryptionFailedException {
         // If the Bitmessage context acts as a full node, synchronization isn't necessary
         LOG.info("Looking for completed POW");
 
-        try {
+        BitmessageAddress identity = Singleton.getIdentity(getContext());
-            BitmessageAddress identity = Singleton.getIdentity(getContext());
+        byte[] privateKey = identity.getPrivateKey().getPrivateEncryptionKey();
-            byte[] privateKey = identity.getPrivateKey().getPrivateEncryptionKey();
+        byte[] signingKey = cryptography().createPublicKey(identity.getPublicDecryptionKey());
-            byte[] signingKey = cryptography().createPublicKey(identity.getPublicDecryptionKey());
+        ProofOfWorkRequest.Reader reader = new ProofOfWorkRequest.Reader(identity);
-            ProofOfWorkRequest.Reader reader = new ProofOfWorkRequest.Reader(identity);
+        ProofOfWorkRepository powRepo = Singleton.getProofOfWorkRepository(getContext());
-            ProofOfWorkRepository powRepo = Singleton.getProofOfWorkRepository(getContext());
+        List<byte[]> items = powRepo.getItems();
-            List<byte[]> items = powRepo.getItems();
+        for (byte[] initialHash : items) {
-            for (byte[] initialHash : items) {
+            ProofOfWorkRepository.Item item = powRepo.getItem(initialHash);
-                ProofOfWorkRepository.Item item = powRepo.getItem(initialHash);
+            byte[] target = cryptography().getProofOfWorkTarget(item.object, item
-                byte[] target = cryptography().getProofOfWorkTarget(item.object, item
+                .nonceTrialsPerByte, item.extraBytes);
-                        .nonceTrialsPerByte, item.extraBytes);
+            CryptoCustomMessage<ProofOfWorkRequest> cryptoMsg = new CryptoCustomMessage<>(
-                CryptoCustomMessage<ProofOfWorkRequest> cryptoMsg = new CryptoCustomMessage<>(
+                new ProofOfWorkRequest(identity, initialHash, CALCULATE, target));
-                        new ProofOfWorkRequest(identity, initialHash, CALCULATE, target));
+            cryptoMsg.signAndEncrypt(identity, signingKey);
-                cryptoMsg.signAndEncrypt(identity, signingKey);
+            CustomMessage response = bmc.send(
-                CustomMessage response = bmc.send(
+                Preferences.getTrustedNode(getContext()),
-                        Preferences.getTrustedNode(getContext()),
+                Preferences.getTrustedNodePort(getContext()),
-                        Preferences.getTrustedNodePort(getContext()),
+                cryptoMsg
-                        cryptoMsg
+            );
-                );
+            if (response.isError()) {
-                if (response.isError()) {
+                LOG.error("Server responded with error: " + new String(response.getData(),
-                    LOG.error("Server responded with error: " + new String(response.getData(),
+                    "UTF-8"));
-                            "UTF-8"));
+            } else {
-                } else {
+                ProofOfWorkRequest decryptedResponse = CryptoCustomMessage.read(
-                    ProofOfWorkRequest decryptedResponse = CryptoCustomMessage.read(
+                    response, reader).decrypt(privateKey);
-                            response, reader).decrypt(privateKey);
+                if (decryptedResponse.getRequest() == COMPLETE) {
-                    if (decryptedResponse.getRequest() == COMPLETE) {
+                    bmc.internals().getProofOfWorkService().onNonceCalculated(
-                        bmc.internals().getProofOfWorkService().onNonceCalculated(
+                        initialHash, decryptedResponse.getData());
-                                initialHash, decryptedResponse.getData());
-                    }
                 }
             }
-            if (items.size() == 0) {
-                stopPowSync(getContext());
-            }
-            LOG.info("Synchronization finished");
-        } catch (Exception e) {
-            LOG.error(e.getMessage(), e);
         }
+        if (items.size() == 0) {
+            stopPowSync(getContext());
+        }
+        LOG.info("Synchronization finished");
     }
 
     public static void startSync(Context ctx) {

app/src/main/java/ch/dissem/apps/abit/util/Preferences.java

@@ -23,6 +23,7 @@ import android.preference.PreferenceManager;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 
@@ -49,7 +50,7 @@ public class Preferences {
      * Warning, this method might do a network call and therefore can't be called from
      * the UI thread.
      */
-    public static InetAddress getTrustedNode(Context ctx) {
+    public static InetAddress getTrustedNode(Context ctx) throws IOException {
         String trustedNode = getPreference(ctx, PREFERENCE_TRUSTED_NODE);
         if (trustedNode == null) return null;
         trustedNode = trustedNode.trim();
@@ -59,15 +60,7 @@ public class Preferences {
             int index = trustedNode.lastIndexOf(':');
             trustedNode = trustedNode.substring(0, index);
         }
-        try {
             return InetAddress.getByName(trustedNode);
-        } catch (UnknownHostException e) {
-            new ErrorNotification(ctx)
-                    .setError(R.string.error_invalid_sync_host)
-                    .show();
-            LOG.error(e.getMessage(), e);
-            return null;
-        }
     }
 
     public static int getTrustedNodePort(Context ctx) {

app/src/main/res/drawable/bg_item_normal_state.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <color android:color="@color/bg_item_normal_state"/>
+    </item>
+</selector>

app/src/main/res/drawable/bg_item_swiping_active_state.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <color android:color="@color/bg_item_swiping_active_state"/>
+    </item>
+</layer-list>

app/src/main/res/drawable/bg_item_swiping_state.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <color android:color="@color/bg_item_swiping_state"/>
+    </item>
+</layer-list>

app/src/main/res/drawable/bg_swipe_item_left.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <color android:color="@color/bg_swipe_item_trash"/>
+    </item>
+    <item
+        android:drawable="@drawable/ic_item_swipe_trash"
+        android:gravity="right|center_vertical"
+        android:width="24dp"
+        android:height="24dp"
+        android:right="16dp"/>
+</layer-list>

app/src/main/res/drawable/bg_swipe_item_neutral.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<color
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@color/bg_swipe_item_neutral"/>

app/src/main/res/drawable/bg_swipe_item_right.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <color android:color="@color/bg_swipe_item_archive"/>
+    </item>
+    <item
+        android:drawable="@drawable/ic_item_swipe_archive"
+        android:gravity="left|center_vertical"
+        android:left="16dp"/>
+</layer-list>

app/src/main/res/drawable/ic_item_swipe_archive.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M19,3L4.99,3c-1.11,0 -1.98,0.89 -1.98,2L3,19c0,1.1 0.88,2 1.99,2L19,21c1.1,0 2,-0.9 2,-2L21,5c0,-1.11 -0.9,-2 -2,-2zM19,15h-4c0,1.66 -1.35,3 -3,3s-3,-1.34 -3,-3L4.99,15L4.99,5L19,5v10z"/>
+</vector>

app/src/main/res/drawable/ic_item_swipe_trash.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"/>
+</vector>

app/src/main/res/drawable/list_divider_h.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+       Copyright (C) 2015 Haruki Hasegawa
+
+       Licensed under the Apache License, Version 2.0 (the "License");
+       you may not use this file except in compliance with the License.
+       You may obtain a copy of the License at
+
+           http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing, software
+       distributed under the License is distributed on an "AS IS" BASIS,
+       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       See the License for the specific language governing permissions and
+       limitations under the License.
+-->
+<shape
+    android:shape="rectangle"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <size android:height="1px"/>
+    <solid android:color="@color/divider"/>
+</shape>

app/src/main/res/layout/fragment_message_list.xml

@@ -4,26 +4,26 @@
                 android:layout_width="match_parent"
                 android:layout_height="match_parent">
 
-    <ListView
+    <android.support.v7.widget.RecyclerView
-            android:layout_width="wrap_content"
+        android:id="@+id/recycler_view"
-            android:layout_height="wrap_content"
+        android:layout_width="match_parent"
-            android:id="@id/android:list"
+        android:layout_height="0dp"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentStart="true"
+        android:layout_alignParentTop="true"
+        android:clipToPadding="false"
 
-            android:paddingBottom="88dp"
+        android:paddingBottom="88dp"
-            android:clipToPadding="false"
+        android:scrollbarStyle="outsideOverlay"
-            android:scrollbarStyle="outsideOverlay"
+        android:scrollbars="vertical"/>
-
-            android:layout_alignParentTop="true"
-            android:layout_alignParentStart="true"
-            android:layout_alignParentBottom="true"/>
 
     <android.support.design.widget.FloatingActionButton
-            android:id="@+id/fab_compose_message"
+        android:id="@+id/fab_compose_message"
-            android:layout_width="wrap_content"
+        android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
+        android:layout_height="wrap_content"
-            android:src="@drawable/ic_action_compose_message"
+        android:layout_alignParentBottom="true"
-            app:elevation="8dp"
+        android:layout_alignParentEnd="true"
-            android:layout_alignParentBottom="true"
+        android:layout_margin="16dp"
-            android:layout_alignParentEnd="true"
+        android:src="@drawable/ic_action_compose_message"
-            android:layout_margin="16dp"/>
+        app:elevation="8dp"/>
-</RelativeLayout>
+</RelativeLayout>

app/src/main/res/layout/message_row.xml

@@ -15,64 +15,85 @@
   ~ limitations under the License.
   -->
 
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout
-                xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android"
-                android:layout_width="match_parent"
+    xmlns:tools="http://schemas.android.com/tools"
-                android:layout_height="wrap_content">
+    android:layout_width="match_parent"
-    <ImageView
+    android:layout_height="wrap_content"
-            android:id="@+id/avatar"
+    android:background="@drawable/bg_swipe_item_neutral">
-            android:layout_width="40dp"
-            android:layout_height="40dp"
-            android:layout_alignParentTop="true"
-            android:layout_alignParentStart="true"
-            android:src="@color/colorAccent"
-            android:layout_margin="16dp"
-            tools:ignore="ContentDescription"/>
 
-    <TextView
+    <FrameLayout
-            android:id="@+id/sender"
+        android:id="@+id/container"
-            android:layout_width="wrap_content"
+        android:layout_width="match_parent"
-            android:layout_height="wrap_content"
+        android:layout_height="match_parent"
-            tools:text="Sender"
+        android:clickable="true"
-            android:lines="1"
+        android:foreground="?attr/selectableItemBackground"
-            android:ellipsize="end"
+        android:background="@drawable/bg_item_normal_state"
-            android:textAppearance="?android:attr/textAppearanceMedium"
+        tools:ignore="UselessParent">
-            android:layout_alignTop="@+id/avatar"
-            android:layout_toEndOf="@+id/avatar"
-            android:layout_marginTop="-5dp"
-            android:paddingTop="0dp"
-            android:paddingLeft="8dp"
-            android:paddingRight="8dp"
-            android:paddingBottom="0dp"
-            android:textStyle="bold"
-            />
 
-    <TextView
+        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-            android:id="@+id/subject"
+                        xmlns:tools="http://schemas.android.com/tools"
-            android:layout_width="wrap_content"
+                        android:layout_width="match_parent"
-            android:layout_height="wrap_content"
+                        android:layout_height="wrap_content">
-            tools:text="Subject"
-            android:lines="1"
-            android:ellipsize="end"
-            android:textAppearance="?android:attr/textAppearanceSmall"
-            android:paddingLeft="8dp"
-            android:paddingRight="8dp"
-            android:layout_below="@+id/sender"
-            android:layout_toEndOf="@+id/avatar"/>
 
-    <TextView
+            <ImageView
-            android:id="@+id/text"
+                android:id="@+id/avatar"
-            android:layout_width="wrap_content"
+                android:layout_width="40dp"
-            android:layout_height="wrap_content"
+                android:layout_height="40dp"
-            tools:text="Text"
+                android:layout_alignParentStart="true"
-            android:lines="1"
+                android:layout_alignParentTop="true"
-            android:ellipsize="end"
+                android:layout_margin="16dp"
-            android:textAppearance="?android:attr/textAppearanceSmall"
+                android:src="@color/colorAccent"
-            android:gravity="center_vertical"
+                tools:ignore="ContentDescription"/>
-            android:paddingLeft="8dp"
-            android:paddingRight="8dp"
-            android:paddingBottom="8dp"
-            android:layout_below="@+id/subject"
-            android:layout_toEndOf="@+id/avatar"/>
 
-</RelativeLayout>
+            <TextView
+                android:id="@+id/sender"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignTop="@+id/avatar"
+                android:layout_marginTop="-5dp"
+                android:layout_toEndOf="@+id/avatar"
+                android:ellipsize="end"
+                android:lines="1"
+                android:paddingBottom="0dp"
+                android:paddingLeft="8dp"
+                android:paddingRight="8dp"
+                android:paddingTop="0dp"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:textStyle="bold"
+                tools:text="Sender"
+                />
+
+            <TextView
+                android:id="@+id/subject"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_below="@+id/sender"
+                android:layout_toEndOf="@+id/avatar"
+                android:ellipsize="end"
+                android:lines="1"
+                android:paddingLeft="8dp"
+                android:paddingRight="8dp"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                tools:text="Subject"/>
+
+            <TextView
+                android:id="@+id/text"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_below="@+id/subject"
+                android:layout_toEndOf="@+id/avatar"
+                android:ellipsize="end"
+                android:gravity="center_vertical"
+                android:lines="1"
+                android:paddingBottom="8dp"
+                android:paddingLeft="8dp"
+                android:paddingRight="8dp"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                tools:text="Text"/>
+
+        </RelativeLayout>
+
+    </FrameLayout>
+
+</FrameLayout>

app/src/main/res/values/colors.xml

@@ -45,4 +45,12 @@
     <color name="material_drawer_dark_selected_text">@color/material_drawer_primary</color>
     <color name="material_drawer_dark_header_selection_text">#FFF</color>
 
+    <!-- swipeable list -->
+    <color name="bg_item_normal_state">#ffffffff</color>
+    <color name="bg_item_swiping_state">@color/colorPrimaryLight</color>
+    <color name="bg_item_swiping_active_state">@color/colorPrimary</color>
+    <color name="bg_swipe_item_neutral">@android:color/transparent</color>
+    <color name="bg_swipe_item_trash">#fff45f30</color>
+    <color name="bg_swipe_item_archive">#fff9930d</color>
+
 </resources>