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在MainActivity我已创建一个处理程序实例变量:搜索栏处理空异常
SeekBar seek_bar;
MediaPlayer player;
Handler seekHandler = new Handler();
然后,我必须在MainActivity以下两种方法来更新搜索条,如媒体播放器的音频播放:
public void getInit() {
seek_bar = (SeekBar) findViewById(R.id.seek_bar);
}
Runnable run = new Runnable() {
@Override
public void run() {
seekUpdation(); **//Exception comes here while closing the app**
}
};
public void seekUpdation() {
seek_bar.setProgress(mMediaPlayer.getCurrentPosition());
seekHandler.postDelayed(run, 1000);
}
我面临的问题是,当音频运行时,用户使用设备返回按钮关闭应用程序。我得到NullPointerException。破坏活动的方法是:
@Override
protected void onDestroy() {
super.onDestroy();
if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
该API是seekHandler.removeCallbacksAndMessages(null); – Sandeep