MediaPlayer播放歌曲

MediaPlayer状态图

State Diagram

Playback control of audio/video files and streams is managed as a state machine. The following diagram shows the life cycle and the states of a MediaPlayer object driven by the supported playback control operations. The ovals represent the states a MediaPlayer object may reside in. The arcs represent the playback control operations that drive the object state transition. There are two types of arcs. The arcs with a single arrow head represent synchronous method calls, while those with a double arrow head represent asynchronous method calls.

第一步：设置权限（很重要，千万别忘了）

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

第二步：按照状态图的顺序调用方法播放歌曲

mButtonPaly.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mButtonPaly.setBackgroundColor(Color.BLUE);
        MediaPlayer mediaPlayer = new MediaPlayer();
        mediaPlayer.reset();
        Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);
        Log.d("music",""+Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getAbsolutePath());
        File filesDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);
        File[] files = filesDir.listFiles();
        for(File file:files){
            Log.d("music",""+file.getAbsolutePath());
        }
        try {
            mediaPlayer.setDataSource(files[0].getAbsolutePath());
            mediaPlayer.prepare();
            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mp.start();
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
});