178 lines
6.0 KiB
Java
178 lines
6.0 KiB
Java
package ch.dissem.apps.abit;
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import android.app.Activity;
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import android.os.Bundle;
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import android.support.design.widget.FloatingActionButton;
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import android.support.v4.app.ListFragment;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ArrayAdapter;
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import android.widget.ListView;
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import android.widget.TextView;
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import android.widget.Toast;
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import ch.dissem.apps.abit.service.Singleton;
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import ch.dissem.bitmessage.BitmessageContext;
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import ch.dissem.bitmessage.entity.Plaintext;
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/**
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* A list fragment representing a list of Messages. This fragment
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* also supports tablet devices by allowing list items to be given an
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* 'activated' state upon selection. This helps indicate which item is
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* currently being viewed in a {@link MessageDetailFragment}.
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* <p/>
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* Activities containing this fragment MUST implement the {@link Callbacks}
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* interface.
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*/
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public class MessageListFragment extends ListFragment {
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/**
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* The serialization (saved instance state) Bundle key representing the
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* activated item position. Only used on tablets.
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*/
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private static final String STATE_ACTIVATED_POSITION = "activated_position";
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/**
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* The fragment's current callback object, which is notified of list item
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* clicks.
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*/
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private Callbacks mCallbacks = sDummyCallbacks;
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/**
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* The current activated item position. Only used on tablets.
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*/
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private int mActivatedPosition = ListView.INVALID_POSITION;
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private BitmessageContext bmc;
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/**
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* A callback interface that all activities containing this fragment must
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* implement. This mechanism allows activities to be notified of item
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* selections.
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*/
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public interface Callbacks {
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/**
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* Callback for when an item has been selected.
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*/
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void onItemSelected(Plaintext plaintext);
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}
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/**
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* A dummy implementation of the {@link Callbacks} interface that does
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* nothing. Used only when this fragment is not attached to an activity.
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*/
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private static Callbacks sDummyCallbacks = new Callbacks() {
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@Override
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public void onItemSelected(Plaintext plaintext) {
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}
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};
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/**
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* Mandatory empty constructor for the fragment manager to instantiate the
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* fragment (e.g. upon screen orientation changes).
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*/
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public MessageListFragment() {
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}
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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bmc = Singleton.getBitmessageContext(getActivity());
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// TODO: replace with a real list adapter.
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setListAdapter(new ArrayAdapter<>(
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getActivity(),
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android.R.layout.simple_list_item_activated_1,
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android.R.id.text1,
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bmc.messages().findMessages(((MessageListActivity) getActivity()).getSelectedLabel())));
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}
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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View rootView = inflater.inflate(R.layout.fragment_message_list, container, false);
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// Show the dummy content as text in a TextView.
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FloatingActionButton fab = (FloatingActionButton) rootView.findViewById(R.id.fab_compose_message);
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fab.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View view) {
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Toast.makeText(MessageListFragment.this.getActivity(), "TODO", Toast.LENGTH_SHORT).show();
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}
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});
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return rootView;
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}
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@Override
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public void onViewCreated(View view, Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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// Restore the previously serialized activated item position.
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if (savedInstanceState != null
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&& savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
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setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
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}
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}
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@Override
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public void onAttach(Activity activity) {
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super.onAttach(activity);
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// Activities containing this fragment must implement its callbacks.
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if (!(activity instanceof Callbacks)) {
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throw new IllegalStateException("Activity must implement fragment's callbacks.");
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}
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mCallbacks = (Callbacks) activity;
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}
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@Override
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public void onDetach() {
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super.onDetach();
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// Reset the active callbacks interface to the dummy implementation.
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mCallbacks = sDummyCallbacks;
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}
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@Override
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public void onListItemClick(ListView listView, View view, int position, long id) {
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super.onListItemClick(listView, view, position, id);
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// Notify the active callbacks interface (the activity, if the
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// fragment is attached to one) that an item has been selected.
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mCallbacks.onItemSelected((Plaintext) listView.getItemAtPosition(position));
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}
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@Override
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public void onSaveInstanceState(Bundle outState) {
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super.onSaveInstanceState(outState);
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if (mActivatedPosition != ListView.INVALID_POSITION) {
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// Serialize and persist the activated item position.
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outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
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}
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}
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/**
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* Turns on activate-on-click mode. When this mode is on, list items will be
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* given the 'activated' state when touched.
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*/
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public void setActivateOnItemClick(boolean activateOnItemClick) {
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// When setting CHOICE_MODE_SINGLE, ListView will automatically
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// give items the 'activated' state when touched.
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getListView().setChoiceMode(activateOnItemClick
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? ListView.CHOICE_MODE_SINGLE
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: ListView.CHOICE_MODE_NONE);
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}
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private void setActivatedPosition(int position) {
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if (position == ListView.INVALID_POSITION) {
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getListView().setItemChecked(mActivatedPosition, false);
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} else {
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getListView().setItemChecked(position, true);
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}
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mActivatedPosition = position;
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}
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}
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