I have a ListFragment that is called from a ListActivity, with a dual fragment layout on a tablet.
I have used the standard MasterDetail Fragment setup from Android Studio 0.3.6 API 19.
MyListFragment looks as follows:
import android.app.Activity;
import android.content.ContentUris;
import android.net.Uri;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.ActionMode;
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.AdapterView;
import android.widget.ListView;
import android.support.v4.widget.SimpleCursorAdapter;
import com.supascale.supascale.contentprovider.SupaScaleContentProvider;
import com.supascale.supascale.database.SupascaleDb;
/**
* A list fragment representing a list of Animals. This fragment
* also supports tablet devices by allowing list items to be given an
* 'activated' state upon selection. This helps indicate which item is
* currently being viewed in a {@link AnimalDetailFragment}.
* <p>
* Activities containing this fragment MUST implement the {@link Callbacks}
* interface.
*
* You can create new ones via the ActionBar entry "Insert".
* You can delete existing ones via a long press on the item.
*/
public class AnimalListFragment extends ListFragment implements
android.support.v4.app.LoaderManager.LoaderCallbacks<Cursor>{
private static final int ACTIVITY_CREATE = 0;
private static final int ACTIVITY_EDIT = 1;
private static final int DELETE_ID = Menu.FIRST + 1;
private SimpleCursorAdapter adapter;
protected Object mActionMode;
private ActionMode.Callback mActionModeCallback;
/**
* The serialization (saved instance state) Bundle key representing the
* activated item position. Only used on tablets.
*/
private static final String STATE_ACTIVATED_POSITION = "activated_position";
/**
* The fragment's current callback object, which is notified of list item
* clicks.
*/
private Callbacks mCallbacks = sDummyCallbacks;
/**
* The current activated item position. Only used on tablets.
*/
private int mActivatedPosition = ListView.INVALID_POSITION;
/**
* A callback interface that all activities containing this fragment must
* implement. This mechanism allows activities to be notified of item
* selections. NB AJW
*/
public interface Callbacks {
/**
* Callback for when an item has been selected.
*/
public void onItemSelected(Uri id);
}
/**
* A dummy implementation of the {@link Callbacks} interface that does
* nothing. Used only when this fragment is not attached to an activity.
*/
private static Callbacks sDummyCallbacks = new Callbacks() {
@Override
public void onItemSelected(Uri animalUri) {
}
};
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public AnimalListFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// super.onCreate(savedInstanceState);
return inflater.inflate(R.layout.animal_list, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
String[] from = new String[] { SupascaleDb.KEY_Animal_ANIMALIDENTIFICATION };
// Fields on the UI to which we map
int[] to = new int[] { R.id.label };
getLoaderManager().initLoader(0, null, this);
adapter = new SimpleCursorAdapter(getActivity(), R.layout.animal_row, null, from,
to, 0);
setListAdapter(adapter);
// Restore the previously serialized activated item position.
if (savedInstanceState != null
&& savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
}
mActionModeCallback = new ActionMode.Callback() {
// Called when the action mode is created; startActionMode() was called
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.listmenu, menu);
return true;
}
// Called each time the action mode is shown. Always called after onCreateActionMode, but
// may be called multiple times if the mode is invalidated.
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false; // Return false if nothing is done
}
// Called when the user selects a contextual menu item
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case DELETE_ID:
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item
.getMenuInfo();
Uri uri = Uri.parse(SupaScaleContentProvider.CONTENT_URI_ANIMAL + "/"
+ info.id);
getActivity().getContentResolver().delete(uri, null, null);
mode.finish(); // Action picked, so close the CAB
return true;
default:
return false;
}
}
// Called when the user exits the action mode
@Override
public void onDestroyActionMode(ActionMode mode) {
mActionMode = null;
}
};
getView().setOnLongClickListener( new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
if (mActionMode != null) {
return false;
}
// Start the CAB using the ActionMode.Callback defined above
mActionMode = view.startActionMode(mActionModeCallback);
view.setSelected(true);
return true;
}
});
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// Activities containing this fragment must implement its callbacks.
if (!(activity instanceof Callbacks)) {
throw new IllegalStateException("Activity must implement fragment's callbacks.");
}
mCallbacks = (Callbacks) activity;
}
@Override
public void onDetach() {
super.onDetach();
// Reset the active callbacks interface to the dummy implementation.
mCallbacks = sDummyCallbacks;
}
@Override
public void onListItemClick(ListView listView, View view, int position, long id) {
super.onListItemClick(listView, view, position, id);
// Notify the active callbacks interface (the activity, if the
// fragment is attached to one) that an item has been selected.
//2013-11-26 AJW Append the clicked item's row ID with the content provider Uri
Uri animalUri = ContentUris.withAppendedId(SupaScaleContentProvider.CONTENT_URI_ANIMAL, id);
// Send the event and Uri to the host activity
mCallbacks.onItemSelected(animalUri);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mActivatedPosition != ListView.INVALID_POSITION) {
// Serialize and persist the activated item position.
outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
}
}
/**
* Turns on activate-on-click mode. When this mode is on, list items will be
* given the 'activated' state when touched.
*/
public void setActivateOnItemClick(boolean activateOnItemClick) {
// When setting CHOICE_MODE_SINGLE, ListView will automatically
// give items the 'activated' state when touched.
getListView().setChoiceMode(activateOnItemClick
? ListView.CHOICE_MODE_SINGLE
: ListView.CHOICE_MODE_NONE);
}
private void setActivatedPosition(int position) {
if (position == ListView.INVALID_POSITION) {
getListView().setItemChecked(mActivatedPosition, false);
} else {
getListView().setItemChecked(position, true);
}
mActivatedPosition = position;
}
/**
* Creates a new loader after the initLoader () call
*/
//@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String[] projection = { SupascaleDb.KEY_ROWID, SupascaleDb.KEY_Animal_ANIMALIDENTIFICATION };
CursorLoader cursorLoader = new CursorLoader(getActivity(),
SupaScaleContentProvider.CONTENT_URI_ANIMAL, projection, null, null, null);
return cursorLoader;
}
//@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
adapter.swapCursor(data);
}
//@Override
public void onLoaderReset(Loader<Cursor> loader) {
// data is not available anymore, delete reference
adapter.swapCursor(null);
}
}
My AnimalListActivity looks as follows:
/**
* An activity representing a list of Animals. This activity
* has different presentations for handset and tablet-size devices. On
* handsets, the activity presents a list of items, which when touched,
* lead to a {@link AnimalDetailActivity} representing
* item details. On tablets, the activity presents the list of items and
* item details side-by-side using two vertical panes.
* <p>
* The activity makes heavy use of fragments. The list of items is a
* {@link AnimalListFragment} and the item details
* (if present) is a {@link AnimalDetailFragment}.
* <p>
* This activity also implements the required
* {@link AnimalListFragment.Callbacks} interface
* to listen for item selections.
*/
public class AnimalListActivity extends FragmentActivity
implements AnimalListFragment.Callbacks {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
private SimpleCursorAdapter adapter;
private static final int ACTIVITY_CREATE = 0;
private static final int ACTIVITY_EDIT = 1;
private static final int DELETE_ID = Menu.FIRST + 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_animal_list);
if (findViewById(R.id.animal_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-large and
// res/values-sw600dp). If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
// In two-pane mode, list items should be given the
// 'activated' state when touched.
((AnimalListFragment) getSupportFragmentManager()
.findFragmentById(R.id.animal_list))
.setActivateOnItemClick(true);
}
// TODO: If exposing deep links into your app, handle intents here.
}
/**
* Callback method from {@link AnimalListFragment.Callbacks}
* indicating that the item with the given ID was selected.
*/
@Override
public void onItemSelected(Uri animalUri) {
//String id = Long.toString(ContentUris.parseId(animalUri));
if (mTwoPane) {
// In two-pane mode, show the detail view in this activity by
// adding or replacing the detail fragment using a
// fragment transaction.
Bundle arguments = new Bundle();
arguments.putString(AnimalDetailFragment.ARG_URI, animalUri.toString()); //Key value pair Adrian "animal_uri = .."
AnimalDetailFragment fragment = new AnimalDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.animal_detail_container, fragment)
.commit();
} else {
// In single-pane mode, simply start the detail activity
// for the selected item ID.
Intent detailIntent = new Intent(this, AnimalDetailActivity.class);
//Uri todoUri = Uri.parse(SupaScaleContentProvider.CONTENT_URI_ANIMAL + "/" + id);
//detailIntent.putExtra(AnimalDetailFragment.ARG_ITEM_ID, id);
//startActivity(detailIntent);
detailIntent.putExtra(SupaScaleContentProvider.CONTENT_ITEM_TYPE, animalUri);
// Activity returns an result if called with startActivityForResult
startActivityForResult(detailIntent, ACTIVITY_EDIT);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.listmenu, menu);
return true;
}
// Reaction to the menu selection
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.insert:
createAnimal();
return true;
}
return super.onOptionsItemSelected(item);
}
private void createAnimal() {
if (mTwoPane) {
// In two-pane mode, show the detail view in this activity by
// adding or replacing the detail fragment using a
// fragment transaction.
Bundle arguments = new Bundle();
//arguments.putString(AnimalDetailFragment.ARG_URI, animalUri.toString()); //Key value pair Adrian "animal_uri = .."
AnimalDetailFragment fragment = new AnimalDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.animal_detail_container, fragment)
.commit();
} else {
// In single-pane mode, simply start the detail activity
Intent i = new Intent(this, AnimalDetailActivity.class);
startActivityForResult(i, ACTIVITY_EDIT);
}
}
}
AnimalListActivity.xml
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/animal_list"
android:name="com.supascale.supascale.AnimalListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
tools:context=".AnimalListActivity"
tools:layout="@android:layout/list_content" />
The List.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@android:id/list" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="No Animal Data"
android:id="@android:id/empty" />
</LinearLayout>
The row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/icon"
android:layout_width="30dp"
android:layout_height="24dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:src="@drawable/reminder" >
</ImageView>
<TextView
android:id="@+id/label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:lines="1"
android:text="@+id/textViewNormalTotal"
android:textSize="24sp"
>
</TextView>
</LinearLayout>
The fragment list scrolls correctly, and when clicked the detail fragment is correctly populated. When I long click, nothing happens, and when I release the longclick, the click event is fired.
I need for the long click to result in the CAB (Context Action Bar) to display, so that I can delete a record, or share a record etc.
mActionMode = view.startActionMode(mActionModeCallback); just never appears to be called.
Hope I have been clear enough.
Regards
Adrian
I edited and added the imports for the ListFragment, as it may have to do with support.v4?
https://stackoverflow.com/questions/20304140
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