[英]TimerTask is already scheduled
I have a MediaPlayer
object which plays a local audio file. 我有一个播放本地音频文件的
MediaPlayer
对象。 I am using a TimerTask
to update the position of a SeekBar and text on a TextView while the audio plays. 我正在使用
TimerTask
在播放音频时更新SeekBar的位置和TextView上的文本。
There is one button. 有一个按钮。 When the user presses the button audio starts.
当用户按下按钮时音频开始。 When they press it a second time the audio stops.
当他们第二次按下它时音频停止。 When they press it a third time to begin playback again the app crashes with the error
当他们第三次按下它再次开始播放时,应用程序会因错误而崩溃
'causedby: TimerTask is scheduled already and InvocationTargetException'.
Here is my code: 这是我的代码:
public void onAudioClicked(View v) {
if (mainPlayer == null) {
mainPlayer = MediaPlayer.create(this, R.raw.session1);
// Get audio duration and set textview
int d = mainPlayer.getDuration();
TextView t = (TextView)findViewById(R.id.totalTime);
t.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes(d),
TimeUnit.MILLISECONDS.toSeconds(d) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(d))));
sb.setProgress(0);
sb.setMax(mainPlayer.getDuration());
mainPlayer.start();
timer = new Timer();
timer.schedule(task, 1000);
} else {
mainPlayer.stop();
mainPlayer.release();
mainPlayer = null;
timer.cancel();
task.cancel();
timer = null;
}
}
TimerTask task = new TimerTask(){
public void run(){
int currentPosition = 0;
int total = mainPlayer.getDuration();
sb.setMax(total);
while (mainPlayer != null && currentPosition < total) {
try {
Thread.sleep(1000);
currentPosition = mainPlayer.getCurrentPosition();
runOnUiThread(updateControlsRunnable);
} catch (InterruptedException e) {
return;
} catch (Exception e) {
return;
}
sb.setProgress(currentPosition);
}
}
};
final Runnable updateControlsRunnable = new Runnable () {
public void run(){
int d = mainPlayer.getCurrentPosition();
TextView t = (TextView)findViewById(R.id.currentTime);
t.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes(d),
TimeUnit.MILLISECONDS.toSeconds(d) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(d))));
}
};
Try this code block please: 请尝试此代码块:
sb.setProgress(0);
sb.setMax(mainPlayer.getDuration());
mainPlayer.start();
timer = new Timer();
MyTask task=new MyTask();
timer.schedule(task,0, 1000);
private class MyTask extends TimerTask {
public void run() {
//Your code...
}
}
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