我一直试图让我的轨迹栏与我刚刚开始工作的音乐播放器配合使用。但是当我按下一个时,我会得到一个例外。 这是我的代码:
public class ThePlayer extends AppCompatActivity {
private static final String TAG = "MyActivity";
static MediaPlayer mp;
int position;
SeekBar mSeekBar;
Button btnPlay, btnFF, btnFB, btnNext, btnPrev;
int[] w2 = {R.raw.w2l01f01, R.raw.w2l01f03, R.raw.w2l01f04};
ArrayList<Integer> mysongs;
Thread updateSeekBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_the_player);
position = 0;
btnPlay = (Button) findViewById(R.id.btnPlay);
btnPlay.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
if (mp.isPlaying()) {
btnPlay.setText(">");
mp.pause();
} else {
btnPlay.setText("||");
mp.start();
}
}
});
btnNext = (Button) findViewById(R.id.btnNext);
btnNext.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
mp.stop();
mp.release();
position = (position + 1) % w2.length;
try {
mp = MediaPlayer.create(getApplicationContext(), w2[position]);
} catch (IllegalArgumentException e) {
Log.e(TAG, "Unable to play audio queue do to exception: " + e.getMessage(), e);
} catch (IllegalStateException e) {
Log.e(TAG, "Unable to play audio queue do to exception: " + e.getMessage(), e);
}
mSeekBar.setMax(mp.getDuration());
mp.start();
}
});
btnPrev = (Button) findViewById(R.id.btnPrev);
if (mp != null) {
mp.stop();
mp.release();
}
mSeekBar = (SeekBar) findViewById(R.id.seekBar);
updateSeekBar = new Thread() {
@Override
public void run() {
int currentPostion = 0;
while (mp.isPlaying() && mp != null && mp.getCurrentPosition() < mp.getDuration()) {
try {
sleep(500);
currentPostion = mp.getCurrentPosition();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
}
mSeekBar.setProgress(currentPostion);
}
}
};
mp = MediaPlayer.create(this, w2[0]);
mp.start();
mSeekBar.setMax(mp.getDuration());
updateSeekBar.start();
mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mp.seekTo(seekBar.getProgress());
}
});
}
}
每次我点击下一个按钮(btnNext),我都会收到此错误
01-04 08:45:01.028 1567-1585/com.wizardarapiraca.wizardplayer E/AndroidRuntime: FATAL EXCEPTION: Thread-93
01-04 08:45:01.028 1567-1585/com.wizardarapiraca.wizardplayer E/AndroidRuntime: Process: com.wizardarapiraca.wizardplayer, PID: 1567
01-04 08:45:01.028 1567-1585/com.wizardarapiraca.wizardplayer E/AndroidRuntime: java.lang.IllegalStateException
01-04 08:45:01.028 1567-1585/com.wizardarapiraca.wizardplayer E/AndroidRuntime: at android.media.MediaPlayer.getCurrentPosition(Native Method)
01-04 08:45:01.028 1567-1585/com.wizardarapiraca.wizardplayer E/AndroidRuntime: at com.wizardarapiraca.wizardplayer.ThePlayer$4.run(ThePlayer.java:107)
答案 0 :(得分:2)
来自评论:
您可以通过删除这些语句mp.stop();
mp.release();
并添加mp.pause();
在此状态下,媒体播放器无法停止并释放。因为......
当使用new创建MediaPlayer对象或在调用reset()
之后,它处于空闲状态;并且在调用release()
之后,它处于End状态。
调用setDataSource(FileDescriptor)
,setDataSource(String)
或setDataSource(Context, Uri)
或setDataSource(FileDescriptor, long, long)
或setDataSource(MediaDataSource)
会将处于空闲状态的MediaPlayer对象转移到初始化状态。
如果在任何其他州调用IllegalStateException
,则会引发setDataSource()
。for more