Java tutorial
/* * Copyright 2013 The Android Open Source Project * * 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.nearalias.musicplayer; import java.util.ArrayList; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.app.SearchManager; import android.content.Intent; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; import com.nearalias.musicplayer.fragments.PlayListFragment; public class MainActivity extends Activity { private DrawerLayout drawerLayout; private ListView drawerListView; private ActionBarDrawerToggle drawerToggle; private CharSequence drawerTitle; private CharSequence currentTitle; private String[] planetTitles; private ArrayList<String> names, artists, albums, genres, lyrics; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); currentTitle = drawerTitle = getTitle(); planetTitles = getResources().getStringArray(R.array.planets_array); drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); drawerListView = (ListView) findViewById(R.id.left_drawer); // set a custom shadow that overlays the main content when the drawer // opens drawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener drawerListView.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, planetTitles)); drawerListView.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the sliding drawer and the action bar app icon drawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ drawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { public void onDrawerClosed(View view) { getActionBar().setTitle(currentTitle); invalidateOptionsMenu(); // creates call to // onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(drawerTitle); invalidateOptionsMenu(); // creates call to // onPrepareOptionsMenu() } }; drawerLayout.setDrawerListener(drawerToggle); if (savedInstanceState == null) { selectItem(0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); return super.onCreateOptionsMenu(menu); } /* Called whenever we call invalidateOptionsMenu() */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // If the nav drawer is open, hide action items related to the content // view boolean drawerOpen = drawerLayout.isDrawerOpen(drawerListView); menu.findItem(R.id.action_websearch).setVisible(!drawerOpen); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // The action bar home/up action should open or close the drawer. // ActionBarDrawerToggle will take care of this. if (drawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action buttons switch (item.getItemId()) { case R.id.action_websearch: // create intent to perform web search for this planet Intent intent = new Intent(Intent.ACTION_WEB_SEARCH); intent.putExtra(SearchManager.QUERY, getActionBar().getTitle()); // catch event that there's no activity to handle intent if (intent.resolveActivity(getPackageManager()) != null) { startActivity(intent); } else { Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show(); } return true; default: return super.onOptionsItemSelected(item); } } /* The click listner for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } private void selectItem(int position) { // update the main content by replacing fragments if (getFragmentManager().findFragmentById(R.id.content_frame) == null) { Fragment fragment = new PlayListFragment(); Bundle args = new Bundle(); args.putInt(PlayListFragment.ARG_PLANET_NUMBER, position); makeUpFakeSongs(); args.putStringArrayList(PlayListFragment.ARG_SONG_NAME, names); args.putStringArrayList(PlayListFragment.ARG_SONG_ARTIST, artists); args.putStringArrayList(PlayListFragment.ARG_SONG_ALBUM, albums); args.putStringArrayList(PlayListFragment.ARG_SONG_GENRE, genres); args.putStringArrayList(PlayListFragment.ARG_SONG_LYRIC, lyrics); fragment.setArguments(args); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); } // update selected item and title, then close the drawer drawerListView.setItemChecked(position, true); setTitle(planetTitles[position]); drawerLayout.closeDrawer(drawerListView); } private void makeUpFakeSongs() { names = new ArrayList<String>(); artists = new ArrayList<String>(); albums = new ArrayList<String>(); genres = new ArrayList<String>(); lyrics = new ArrayList<String>(); for (int i = 0; i < 20; i++) { names.add("Song Number " + (i + 1)); artists.add("Artist Number " + (i + 1)); albums.add("Album Number " + (i + 1) + " - "); genres.add("Genre Number " + (i + 1)); lyrics.add("Lyric Number " + (i + 1)); } } @Override public void setTitle(CharSequence title) { currentTitle = title; getActionBar().setTitle(currentTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. drawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls drawerToggle.onConfigurationChanged(newConfig); } }