1-1、MediaPlayer播放音频

1、基本使用

1-1、播放网络URL

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private MediaPlayer mediaPlayer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void start(View view) {
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                Log.d(TAG, "onPrepared: " + mp.toString());
                mediaPlayer.start();
            }
        });
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                Log.d(TAG, "onCompletion: " + mp.toString());
            }
        });
        mediaPlayer.setOnSeekCompleteListener(new MediaPlayer.OnSeekCompleteListener() {
            @Override
            public void onSeekComplete(MediaPlayer mp) {
                Log.d(TAG, "onSeekComplete: " + mp.toString());
            }
        });
        mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(MediaPlayer mp, int what, int extra) {
                Log.e(TAG, "onError: what = " + what + ", extra = " + extra);
                return false;
            }
        });
        try {
            String url = "http://hipanda.hf.openstorage.cn/talkres/LTP_Poem_Res/3f6ad10fe8e0434d99acaa6c9e4ee935.mp3";
            mediaPlayer.setDataSource(url);
            // 同步prepare
            mediaPlayer.prepare();
            mediaPlayer.setLooping(true);
            mediaPlayer.start();
        } catch (IOException e) {
            Log.e(TAG, "start: " + e.toString());
            e.printStackTrace();
        }
    }
    public void play(View view) {
        mediaPlayer.start();
    }
    public void pause(View view) {
        mediaPlayer.pause();
//        mediaPlayer.setVolume(0.5F,0.5F);
    }
    public void stop(View view) {
        mediaPlayer.stop();
//        mediaPlayer.setVolume(1,1);
    }
    public void statu(View view) {
        int currentPosition = mediaPlayer.getCurrentPosition();
        Log.e(TAG, "statu: currentPosition = " + currentPosition);
        int duration = mediaPlayer.getDuration();
        Log.e(TAG, "statu: duration = " + duration);
        boolean playing = mediaPlayer.isPlaying();
        Log.e(TAG, "statu: playing = " + playing);
        boolean looping = mediaPlayer.isLooping();
        Log.e(TAG, "statu: looping = " + looping);
    }
}

• 调用start之后会播放，播放过程中可以获取进度和总时长

  D/MainActivity: onPrepared: android.media.MediaPlayer@3b4d7c9
  E/MainActivity: statu: currentPosition = 6644
  E/MainActivity: statu: duration = 23518
  E/MainActivity: statu: currentPosition = 8221
  E/MainActivity: statu: duration = 23518
  E/MainActivity: statu: currentPosition = 9987
  E/MainActivity: statu: duration = 23518
  E/MainActivity: statu: currentPosition = 15639
  E/MainActivity: statu: duration = 23518
  E/MainActivity: statu: currentPosition = 17512
  E/MainActivity: statu: duration = 23518
  E/MainActivity: statu: currentPosition = 19003
  E/MainActivity: statu: duration = 23518
  E/MainActivity: statu: currentPosition = 22846
  E/MainActivity: statu: duration = 23518
  D/MainActivity: onCompletion: android.media.MediaPlayer@3b4d7c9

  1-2、播放raw

• main/res/raw/test.mp4

        mediaPlayer = MediaPlayer.create(this, R.raw.test);
        // 无须prepare，否者会报错
        // mediaPlayer.prepare();
        mediaPlayer.setLooping(true);
        mediaPlayer.start();

  1-3、播放本地文件

        try {
            mediaPlayer = new MediaPlayer();
            String url = Environment.getExternalStorageDirectory().getAbsolutePath()+ File.separator+"test.mp3";
            mediaPlayer.setDataSource(url);
            mediaPlayer.prepare();
            mediaPlayer.start();
        } catch (IOException e) {
            Log.e(TAG, "start: " + e.toString());
            e.printStackTrace();
        }

  1-4、播放assets

• main/assets/test.mp4

        try {
            mediaPlayer = new MediaPlayer();
            AssetFileDescriptor fileDescriptor = getAssets().openFd("test.mp3");
            mediaPlayer.setDataSource(fileDescriptor.getFileDescriptor(),fileDescriptor.getStartOffset(), fileDescriptor.getLength());
            mediaPlayer.prepare();
            mediaPlayer.start();
        } catch (IOException e) {
            Log.e(TAG, "start: " + e.toString());
            e.printStackTrace();
        }

  2、MediaPlayer常用API

• getCurrentPosition( )：得到当前的播放位置

• getDuration() ：得到文件的时间
• setLooping(boolean looping)：设置是否循环播放
• isLooping()：是否循环播放
• isPlaying()：是否正在播放
• start()：开始播放
• stop()：停止播放
• pause()：暂停
• prepare()：准备(同步)
• prepareAsync()：准备(异步)
• seekTo(int msec)：指定播放的位置（以毫秒为单位的时间）
• release()：释放MediaPlayer对象
• reset()：重置MediaPlayer对象
• setVolume(float leftVolume, float rightVolume)：设置音量
• 视频相关
  • setAudioStreamType(int streamtype)：指定流媒体的类型
  • setDisplay(SurfaceHolder sh)：设置用SurfaceHolder来显示多媒体
  • setScreenOnWhilePlaying(boolean screenOn)：设置是否使用SurfaceHolder显示
  • getVideoHeight() ：得到视频高度
  • getVideoWidth() ：得到视频宽度
• 回调相关
  • setOnBufferingUpdateListener(MediaPlayer.OnBufferingUpdateListener listener)： 网络流媒体的缓冲监听
  • setOnCompletionListener(MediaPlayer.OnCompletionListener listener)： 网络流媒体播放结束监听
  • setOnErrorListener(MediaPlayer.OnErrorListener listener)： 设置错误信息监听
  • setOnVideoSizeChangedListener(MediaPlayer.OnVideoSizeChangedListener listener)： 视频尺寸监听