Java tutorial
/* * Copyright (C) 2012 Felix Ableitner * * 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 com.github.nutomic.pegasus.activities; import android.app.AlertDialog; import android.app.ListActivity; import android.content.ContentValues; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.content.res.TypedArray; import android.database.Cursor; import android.os.AsyncTask; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.widget.SimpleCursorAdapter; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.WindowManager; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.EditText; import android.widget.ListView; import com.github.nutomic.pegasus.LocationService; import com.github.nutomic.pegasus.R; import com.github.nutomic.pegasus.content.AreaColumns; import com.github.nutomic.pegasus.content.CellColumns; import com.github.nutomic.pegasus.content.CellLogColumns; import com.github.nutomic.pegasus.content.Database; import com.github.nutomic.pegasus.content.ProfileColumns; /** * Displays a list of areas. * * @author Felix Ableitner * */ public class AreaList extends ListActivity { public static final String AREANAME = "areaname"; public static final String PROFILENAME = "profilename"; private static final String FIRST_RUN = "first_run"; SimpleCursorAdapter mAdapter; /** * AsyncTask that refreshes the ListView and LocationService after finishing. * * @author Felix Ableitner * */ private abstract class UpdateTask extends AsyncTask<Void, Void, Long> { @Override protected void onPostExecute(Long result) { updateCursor(); LocationService.sendUpdateIntent(AreaList.this); } } /** * Initializes layout. */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); registerForContextMenu(getListView()); mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, null, new String[] { AREANAME, PROFILENAME }, new int[] { android.R.id.text1, android.R.id.text2 }, 0); setListAdapter(mAdapter); // Show welcome dialog only on first start. SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); if (prefs.getBoolean(FIRST_RUN, true)) { Editor e = prefs.edit(); e.putBoolean(FIRST_RUN, false); e.commit(); new AlertDialog.Builder(this).setTitle(R.string.arealist_intro_title) .setMessage(R.string.arealist_intro_text).setPositiveButton(android.R.string.ok, null).show(); } // Make sure LocationService is running. startService(new Intent(this, LocationService.class)); } /** * Open SQL cursor. */ @Override protected void onStart() { super.onStart(); updateCursor(); } /** * Close SQL cursor. */ @Override protected void onStop() { super.onStop(); mAdapter.changeCursor(null); } /** * Replace the current list cursor with a new one. */ private void updateCursor() { // Default string if noe profile is set. String noProfile = getResources().getString(R.string.arealist_profile_none); mAdapter.changeCursor(Database.getInstance(this).getReadableDatabase() .rawQuery("SELECT a._id, a.name as " + AREANAME + ", " + "ifnull(p.name, '" + noProfile + "') as " + PROFILENAME + " " + "FROM " + AreaColumns.TABLE_NAME + " as a " + "LEFT JOIN " + ProfileColumns.TABLE_NAME + " as p " + "ON a.profile_id = p._id " + "ORDER BY a." + AreaColumns._ID + " ASC", null)); } /** * Open corresponding sound profile. */ @Override protected void onListItemClick(ListView l, View v, int position, long id) { Intent i = new Intent(this, AreaEdit.class); i.putExtra(AreaEdit.AREA_ID, id); startActivity(i); } /** * Create context menu for ListView items. Modifiers are hidden for the * default area. */ public void onCreateContextMenu(android.view.ContextMenu menu, View v, android.view.ContextMenu.ContextMenuInfo menuInfo) { getMenuInflater().inflate(R.menu.area_list_context, menu); AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo; String name = getAreaName(info); menu.setHeaderTitle(name); // Default area selected, can't rename, learn or delete. if (info.id == AreaColumns.AREA_DEFAULT) { menu.removeItem(R.id.rename); menu.removeItem(R.id.learn); menu.removeItem(R.id.delete); } } private String getAreaName(AdapterContextMenuInfo info) { Cursor c = (Cursor) mAdapter.getItem(info.position); return c.getString(c.getColumnIndex(AREANAME)); } /** * Context item on ListView selected, allow choosing the associated sound * profile, renaming, learning or deleting the area. */ @Override public boolean onContextItemSelected(MenuItem item) { final AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); final Database db = Database.getInstance(this); switch (item.getItemId()) { case R.id.rename: renameArea(info.id, getAreaName((AdapterContextMenuInfo) item.getMenuInfo())); return true; case R.id.learn: new AlertDialog.Builder(this).setTitle(R.string.arealist_learn) .setItems(R.array.arealist_learn_area_strings, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { TypedArray millisecondValues = getResources() .obtainTypedArray(R.array.arealist_learn_area_values); long interval = millisecondValues.getInt(which, 0); if (interval > 0) { // Add future cells during interval. Intent i = new Intent(AreaList.this, LocationService.class); i.putExtra(LocationService.MESSAGE_LEARN_AREA, info.id); i.putExtra(LocationService.MESSAGE_LEARN_INTERVAL, interval); startService(i); // Add only the current cell from database. interval = 0; } else { // Do not pass the negativity to Database. interval = -interval; } final long selectionStartTime = System.currentTimeMillis() - interval; new UpdateTask() { @Override protected Long doInBackground(Void... params) { ContentValues cv = new ContentValues(); cv.put(CellColumns.AREA_ID, info.id); // Set current area in current cell and in any cell that was visited during interval. db.getWritableDatabase().update(CellColumns.TABLE_NAME, cv, CellColumns._ID + " = (SELECT " + CellLogColumns.CELL_ID + " FROM " + CellLogColumns.TABLE_NAME + " ORDER BY " + CellLogColumns.TIMESTAMP + " DESC Limit 1) OR " + CellColumns._ID + " IN (SELECT " + CellLogColumns.CELL_ID + " FROM " + CellLogColumns.TABLE_NAME + " WHERE " + CellLogColumns.TIMESTAMP + " > ?)", new String[] { Long.toString(selectionStartTime) }); return null; } }.execute((Void) null); } }).show(); return true; case R.id.delete: new AlertDialog.Builder(this).setTitle(R.string.arealist_delete) .setMessage(R.string.arealist_delete_message) .setPositiveButton(android.R.string.yes, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { new UpdateTask() { @Override protected Long doInBackground(Void... params) { // Don't delete default area. if (info.id != AreaColumns.AREA_DEFAULT) { db.getWritableDatabase().delete(AreaColumns.TABLE_NAME, AreaColumns._ID + " = ?", new String[] { Long.toString(info.id) }); // Reset cells to default area. ContentValues cv = new ContentValues(); cv.put(CellColumns.AREA_ID, AreaColumns.AREA_DEFAULT); db.getWritableDatabase().update(CellColumns.TABLE_NAME, cv, CellColumns.AREA_ID + " = ?", new String[] { Long.toString(info.id) }); } return null; } }.execute((Void) null); } }).setNegativeButton(android.R.string.no, null).show(); return true; default: return super.onContextItemSelected(item); } } /** * Show an AlertDialog to edit the name of an area. * * @param area ID of the area to rename. */ private void renameArea(final long id, String name) { final Database db = Database.getInstance(this); final EditText input = new EditText(this); input.setText(name); input.setSingleLine(); AlertDialog alert = new AlertDialog.Builder(this).setTitle(R.string.arealist_rename).setView(input) .setPositiveButton(android.R.string.ok, new OnClickListener() { public void onClick(DialogInterface dialog, int which) { new UpdateTask() { @Override protected Long doInBackground(Void... params) { // Don't rename default area. if (id != AreaColumns.AREA_DEFAULT) { ContentValues cv = new ContentValues(); cv.put(AreaColumns.NAME, input.getText().toString()); db.getWritableDatabase().update(AreaColumns.TABLE_NAME, cv, AreaColumns._ID + " = ?", new String[] { Long.toString(id) }); } return null; } }.execute((Void) null); } }).setNegativeButton(android.R.string.cancel, null).create(); alert.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE); alert.show(); input.selectAll(); } /** * Create ActionBar menu from xml. */ @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.area_list, menu); return true; } /** * Handle ActionBar item selections. */ @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case R.id.profiles: startActivity(new Intent(this, ProfileList.class)); return true; case R.id.new_area: new UpdateTask() { @Override protected Long doInBackground(Void... arg0) { ContentValues cv = new ContentValues(); cv.put(AreaColumns.NAME, getResources().getString(R.string.arealist_new)); cv.put(AreaColumns.PROFILE_ID, Database.ROW_NONE); cv.put(AreaColumns.WIFI_ENABLED, true); cv.put(AreaColumns.BLUETOOTH_ENABLED, false); return Database.getInstance(AreaList.this).getWritableDatabase().insert(AreaColumns.TABLE_NAME, null, cv); } @Override protected void onPostExecute(Long result) { super.onPostExecute(result); renameArea(result, getAreaName((AdapterContextMenuInfo) item.getMenuInfo())); } }.execute((Void) null); return true; default: return super.onOptionsItemSelected(item); } } }