Android之简易音乐播发器

布局主要代码之ListView：

<span style="font-size:14px;"> <ListView
        android:id="@+id/music_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/handle_btnlayout"
        android:cacheColorHint="#00000000"      /*设置为透明，防止滑动时背景变成白色*/
        android:dividerHeight="1dip"
        android:divider="#88888888"          /*设置分割线的颜色和透明度*/
        android:listSelector="#00000000"
        android:layout_marginBottom="50dp" >
 </ListView></span>

Android之UI界面代码：

<span style="font-size:14px;">public class Music extends BaseActivity{       //BaseActivity继承Activity作为所有活动的父类
	public static final String ACTION_UPDATEUI = "action.updateUI";
	private ListView ls = null;
	private Button play_music = null;
	private Button previous_music =null;
	private Button next_music =null;
	private Button repeat_music = null;
	private Button shuffle_music =null;
	private TextView music_title = null;
	private TextView music_duration =null;
	public static List<Map<String, String>> list ;
	private Boolean start = false;
	private Boolean isrepeat = MusicService.repeat;
	UpdateUIBroadcastReceiver broadcastReceiver;
	@Override
	protected void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		super.setContentView(R.layout.home_activity_layout);
		play_music = (Button) findViewById(R.id.play_music);
		previous_music = (Button) findViewById(R.id.previous_music);
		next_music = (Button) findViewById(R.id.next_music);
		repeat_music = (Button) findViewById(R.id.repeat_music);
		shuffle_music = (Button) findViewById(R.id.shuffle_music);
		music_title = (TextView) findViewById(R.id.music_title);
		music_duration = (TextView) findViewById(R.id.music_duration);
		music_title.setText(MusicService.music_title);
		music_duration.setText(MusicService.music_time);

		play_music.setOnClickListener(new ButtonsetOnClickListener());
		previous_music.setOnClickListener(new ButtonsetOnClickListener());
		next_music.setOnClickListener(new ButtonsetOnClickListener());
		repeat_music.setOnClickListener(new ButtonsetOnClickListener());
		shuffle_music.setOnClickListener(new ButtonsetOnClickListener());
		if(MusicService.isplay){
			play_music.setBackgroundResource(R.drawable.pause_selector);
		}else{
			play_music.setBackgroundResource(R.drawable.play_selector);
		}
		if(isrepeat){
			repeat_music.setBackgroundResource(R.drawable.repeat_all_selector);
		}else{
			shuffle_music.setBackgroundResource(R.drawable.shuffle_selector);
		}
		//动态注册广播接收器
		IntentFilter filter = new IntentFilter();
		filter.addAction(ACTION_UPDATEUI);
		broadcastReceiver = new UpdateUIBroadcastReceiver();
		registerReceiver(broadcastReceiver, filter);

		ls = (ListView) findViewById(R.id.music_list);
		//接下来要将这些数据封装成ArrayAdapter对象
		SimpleAdapter adapter = this.getAdapter();
		ls.setAdapter(adapter);
		ls.setOnItemClickListener(new ItemClick());     //点击
		ls.setOnItemLongClickListener(null);   //长按
		ls.setOnItemSelectedListener(null);    //勾选
	}
	private class ButtonsetOnClickListener implements OnClickListener{
		Intent intent =new Intent(Music.this, MusicService.class);           //记得注册Service
		Bundle bundle = new Bundle();
		@Override
		public void onClick(View v) {
			switch(v.getId()){
			case R.id.play_music:
				if(start){
					play_music.setBackgroundResource(R.drawable.play_selector);
					bundle.putBoolean("start", false);
					start = false;
				}else{
					play_music.setBackgroundResource(R.drawable.pause_selector);
					bundle.putBoolean("start", true);
					start = true;
				}
				break;
			case R.id.previous_music:
				bundle.putBoolean("previous", true);
				break;
			case R.id.next_music:
				bundle.putBoolean("next", true);
				break;
			case R.id.repeat_music:
				bundle.putBoolean("repeat", true);
				repeat_music.setBackgroundResource(R.drawable.repeat_all_selector);
				shuffle_music.setBackgroundResource(R.drawable.shuffle_none_selector);
				break;
			case R.id.shuffle_music:
				bundle.putBoolean("shuffle", true);
				shuffle_music.setBackgroundResource(R.drawable.shuffle_selector);
				repeat_music.setBackgroundResource(R.drawable.repeat_none_selector);
				break;
				default:
				break;
			}
			intent.putExtras(bundle); 		//Intent传递参数
			Music.this.startService(intent);    //启动服务
		}
	}
	//定义广播接收器（内部类）
	private class UpdateUIBroadcastReceiver extends BroadcastReceiver{
		@Override
		public void onReceive(Context context, Intent intent) {
			music_title.setText(String.valueOf(intent.getExtras().getString("music_title")));
			music_duration.setText(String.valueOf(intent.getExtras().getString("music_time")));
		}
	}
	@SuppressLint("SimpleDateFormat")
	private SimpleAdapter getAdapter(){
		// 使用SimpleAdapter来封装数据时必需要把每个显示的数据封装成Map
		list=new ArrayList<Map<String, String>>();
		SimpleDateFormat format = new SimpleDateFormat("mm:ss");
		//取得所有在外部存储卡上的音乐文件的信息 ps : MediaStore.Audio.Media.INTERNAL_CONTENT_URI 获得内置存储
		Cursor cursor = Music.this.getContentResolver().query(
				MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
				MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
		cursor.moveToFirst();
		for(int i=0;i<cursor.getCount();i++){
			String title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));   //歌曲的名称
			String url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));   //歌曲文件的路径
			int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));	 //歌曲的总播放时长
			String hmsString = format.format(duration);
			Map<String, String>map =new HashMap<String, String>();
			map.put("title", title);
			map.put("time", hmsString);
			map.put("url", url);
			list.add(map);
			cursor.moveToNext();
		}
		SimpleAdapter adapter =new SimpleAdapter(this,               //上下文，显示对象
				list,                                                 // 要显示的数据，一定要上面的格式进行封装
				R.layout.music_list,                   // 列表中要显示的单项信息的布局
				new String[]{"title","time"},    // map中的key
				new int[]{R.id.music_title_my,R.id.music_time_my});    // 显示到组件

		return adapter;
	}
	//点击事件
	private class ItemClick implements OnItemClickListener{
		@Override
		public void onItemClick(AdapterView<?> parent, View view, int position,
				long id) {
			Intent intent =new Intent(Music.this, MusicService.class);           //记得注册Activity
			Bundle bundle = new Bundle();
			bundle.putBoolean("playing", true);
			bundle.putInt("position", position);
			intent.putExtras(bundle); 		//Intent传递参数
			Music.this.startService(intent);    //启动服务
			play_music.setBackgroundResource(R.drawable.pause_selector);
		}
	}
}
</span>

<span style="font-size:14px;">public class MusicService extends Service{
	public static String music_title ="";
	public static String music_time ="";
	private MediaPlayer mp ;
	private List<Map<String, String>> list = Music.list;
	private int position ;
	private boolean playing = false;
	private boolean start = true;
	private boolean previous = false;
	private boolean next =false;
	public static boolean repeat = true;
	private boolean shuffle = false;
	public static boolean isplay = false;
	Random random = new Random();
	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}
	@Override
	public void onCreate(){
		super.onCreate();
		/*
		final Intent intent = new Intent();
		intent.setAction(Music.ACTION_UPDATEUI);
		timer = new Timer();
		task = new TimerTask() {
			@Override
			public void run() {
				intent.putExtra("count", ++count);
				sendBroadcast(intent);
			}
		};
		timer.schedule(task, 1000,1000);
		*/
	}
	@SuppressLint("NewApi")
	@Override
	public int onStartCommand(Intent intent, int flags, int startId){
		start = intent.getBooleanExtra("start", true);       //取不到值，默认false
		playing = intent.getBooleanExtra("playing", false);
		previous = intent.getBooleanExtra("previous", false);
		next = intent.getBooleanExtra("next", false);
		if(repeat){
			shuffle = intent.getBooleanExtra("shuffle", false);
			if(shuffle){
				repeat = false;
			}
		}else if(shuffle){
			repeat = intent.getBooleanExtra("repeat", false);
			if(repeat){
				shuffle = false;
			}
		}
		if(playing){
			position = intent.getIntExtra("position",1);
			Uri uri = Uri.parse(list.get(position).get("url"));
			playsong(uri);
		}else if(previous){
			previoussong();
		}else if(next){
			nextsong();
		}
		if(mp!=null){
			if(start){
				mp.start();
				isplay = true;
			}else{
				mp.pause();   //暂停播放
				isplay = false;
			}
		}
		return super.onStartCommand(intent, flags, startId);
	}
	private void playsong(Uri uri){
		if(mp!=null&&mp.isPlaying()){
			mp.stop();    //停止播放
		}
		mp = MediaPlayer.create(this, uri);
		mp.start();
		mp.setOnCompletionListener(new CompletionListener());
		music_title = list.get(position).get("title");
		music_time = list.get(position).get("time");
		//发送广播，改变界面
		Intent intent = new Intent();
		intent.setAction(Music.ACTION_UPDATEUI);
		Bundle bundle = new Bundle();
		bundle.putString("music_title",music_title) ;
		bundle.putString("music_time", music_time);
		intent.putExtras(bundle);
		sendBroadcast(intent);
	}
	//获取随机数
	private int randomInt(){
		int num = random.nextInt(list.size());
		if(num>=1&&num<=list.size()-1){
			return num;
		}else{
			return randomInt();
		}
	}
	private void previoussong(){
		if(repeat){
			position--;
			if(position<=1){
				position = list.size()-1;
			}
		}else{
			position = randomInt();
		}
		String urlstr = list.get(position).get("url");
		Uri uri = Uri.parse(urlstr);
		playsong(uri);
	}
	private void nextsong(){
		if(repeat){
			position++;
			if(position>=list.size()){
				position = 1;
			}
		}else{
			position = randomInt();
		}
		String urlstr = list.get(position).get("url");
		Uri uri = Uri.parse(urlstr);
		playsong(uri);
	}
	private class CompletionListener implements OnCompletionListener{
		@Override
		public void onCompletion(MediaPlayer mp) {
			nextsong();
		}
	}
	@Override
	public void onDestroy(){
		super.onDestroy();
		if(mp!=null) mp.release();   //释放资源
		stopSelf();
	//	timer.cancel();
	}
}</span>