Java tutorial
/******************************************************************************* * Copyright (c) 2013 Humberto Fraga <xisberto@gmail.com>. * All rights reserved. This program and the accompanying materials * are made available under the terms of the GNU Public License v3.0 * which accompanies this distribution, and is available at * http://www.gnu.org/licenses/gpl.html * * Contributors: * Humberto Fraga <xisberto@gmail.com> - initial API and implementation ******************************************************************************/ package net.xisberto.phonetodesktop; import net.xisberto.phonetodesktop.database.DatabaseHelper; import net.xisberto.phonetodesktop.database.TableTasks; import net.xisberto.phonetodesktop.network.GoogleTasksService; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.database.Cursor; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.widget.SimpleCursorAdapter; import android.util.SparseArray; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import com.actionbarsherlock.app.SherlockListActivity; import com.actionbarsherlock.view.ActionMode; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; public class WaitListActivity extends SherlockListActivity implements OnItemClickListener { SimpleCursorAdapter adapter; ActionMode actionMode; SparseArray<Long> selectedItems; BroadcastReceiver receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Utils.log("WaitListActivity received broadcast"); new ListLocalTask(ListLocalTask.ACTION_LIST).execute(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getSupportActionBar().setDisplayHomeAsUpEnabled(true); setContentView(R.layout.activity_link_list); selectedItems = new SparseArray<Long>(); } @Override protected void onStart() { super.onStart(); getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); getListView().setOnItemClickListener(this); new ListLocalTask(ListLocalTask.ACTION_LIST).execute(); LocalBroadcastManager.getInstance(this).registerReceiver(receiver, new IntentFilter(Utils.ACTION_LIST_LOCAL_TASKS)); } @Override protected void onStop() { super.onStop(); LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver); } @Override public boolean onCreateOptionsMenu(Menu menu) { getSupportMenuInflater().inflate(R.menu.activity_wait_list, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: NavUtils.navigateUpFromSameTask(this); return true; case R.id.action_sendall: new ListLocalTask(ListLocalTask.ACTION_SEND_ALL).execute(); } return super.onOptionsItemSelected(item); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Utils.log("Item id: " + id); if (selectedItems.get(position) == null) { selectedItems.put(position, id); getListView().setItemChecked(position, true); } else { selectedItems.remove(position); getListView().setItemChecked(position, false); } if (selectedItems.size() > 0) { String title = getResources().getQuantityString(R.plurals.txt_selected_items, selectedItems.size()); title = String.format(title, selectedItems.size()); if (actionMode == null) { actionMode = startActionMode(new ActionModeCallback()); } actionMode.setTitle(title); } else { if (actionMode != null) { actionMode.finish(); } } } private class ListLocalTask extends AsyncTask<Long, Void, Cursor> { private static final int ACTION_LIST = 1, ACTION_SEND_ALL = 2, ACTION_DELETE_SELECTED = 3, ACTION_SEND_SELECTED = 4; private int action; public ListLocalTask(int action) { this.action = action; } @Override protected Cursor doInBackground(Long... params) { DatabaseHelper databaseHelper = DatabaseHelper.getInstance(WaitListActivity.this); switch (action) { case ACTION_SEND_SELECTED: return databaseHelper.listTasksAsCursorById(params); case ACTION_DELETE_SELECTED: databaseHelper.delete(params); case ACTION_LIST: case ACTION_SEND_ALL: return databaseHelper.listTaskQueueAsCursor(); default: return databaseHelper.listTaskQueueAsCursor(); } } @Override protected void onPostExecute(Cursor result) { switch (action) { case ACTION_LIST: case ACTION_DELETE_SELECTED: if (adapter == null) { adapter = new SimpleCursorAdapter(WaitListActivity.this, R.layout.listitem_localtask, result, new String[] { TableTasks.COLUMN_TITLE }, new int[] { android.R.id.text1 }, 0); getListView().setAdapter(adapter); } else { adapter.swapCursor(result); } break; case ACTION_SEND_ALL: case ACTION_SEND_SELECTED: if (result.getCount() == 0) { return; } long[] tasks_ids = new long[result.getCount()]; for (int i = 0; i < result.getCount(); i++) { result.moveToNext(); tasks_ids[i] = result.getLong(0); } Intent service = new Intent(WaitListActivity.this, GoogleTasksService.class); service.setAction(Utils.ACTION_SEND_TASKS); service.putExtra(Utils.EXTRA_TASKS_IDS, tasks_ids); startService(service); break; default: break; } } } private final class ActionModeCallback implements ActionMode.Callback { @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { getSupportMenuInflater().inflate(R.menu.cab_wait_list, menu); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { Long[] selected_ids = new Long[selectedItems.size()]; for (int i = 0; i < selected_ids.length; i++) { selected_ids[i] = selectedItems.get(selectedItems.keyAt(i)); } switch (item.getItemId()) { case R.id.action_delete_multiple: new ListLocalTask(ListLocalTask.ACTION_DELETE_SELECTED).execute(selected_ids); break; case R.id.action_send_multiple: new ListLocalTask(ListLocalTask.ACTION_SEND_SELECTED).execute(selected_ids); break; } actionMode.finish(); return true; } @Override public void onDestroyActionMode(ActionMode mode) { for (int i = 0; i < getListView().getAdapter().getCount(); i++) { getListView().setItemChecked(i, false); } selectedItems.clear(); if (mode == actionMode) { actionMode = null; } } } }