android 音频播放--MediaPlayer

最新推荐文章于 2024-11-18 23:06:42 发布

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#android #MediaPlayer #音频 #异步 #path

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本文介绍如何使用Android的MediaPlayer API创建基本的音频播放器应用，包括播放、暂停、重播和停止等功能，并提供了完整的代码示例。

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通常我们开发android 音频播放器有两种选择,一是MediaPlayer,二是soundpool.这里说下mediaplayer.

使用android API 我们new出 mediaplayer,直接对其操作.

四个button实现播放,暂停,重播,停止功能.

public class MainActivity extends Activity implements OnClickListener {
private EditText et_path;
private Button bt_play, bt_pause, bt_replay, bt_stop;
private MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_path = (EditText) findViewById(R.id.et_path);
bt_play = (Button) findViewById(R.id.bt_play);
bt_pause = (Button) findViewById(R.id.bt_pause);
bt_replay = (Button) findViewById(R.id.bt_replay);
bt_stop = (Button) findViewById(R.id.bt_stop);

bt_pause.setOnClickListener(this);
bt_play.setOnClickListener(this);
bt_replay.setOnClickListener(this);
bt_stop.setOnClickListener(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_play:
play();
break;
case R.id.bt_pause:
pause();
break;
case R.id.bt_replay:
replay();
break;
case R.id.bt_stop:
stop();
break;
}
}

private void pause() {

if ("继续".equals(bt_pause.getText().toString().trim())) {
mediaPlayer.start();
bt_pause.setText("暂停");
return;
}
if (mediaPlayer!=null&&mediaPlayer.isPlaying()) {
mediaPlayer.pause();
bt_pause.setText("继续");
return;
}

}

private void replay() {
if (mediaPlayer!=null&&mediaPlayer.isPlaying()) {
mediaPlayer.seekTo(0);
return;
}
play();
}

private void stop() {
if (mediaPlayer!=null&&mediaPlayer.isPlaying()) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
bt_play.setEnabled(true);
}
}

private void play() {
String path = et_path.getText().toString().trim();
File file = new File(path);
if (file.exists()&&file.length()>0) {
try {
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(path);
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {

@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();

}
});

mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

@Override
public void onCompletion(MediaPlayer mp) {
bt_play.setEnabled(true);
}
});

mediaPlayer.setOnErrorListener(new OnErrorListener() {

@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
bt_play.setEnabled(true);
return false;
}
});

bt_play.setEnabled(false);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
Toast.makeText(this, "播放失败", 0).show();
e.printStackTrace();
}
}else {
Toast.makeText(this, "音频不存在", 0).show();
}

}

}