0
在MainActivity我已創建一個處理程序實例變量:搜索欄處理空異常
SeekBar seek_bar;
MediaPlayer player;
Handler seekHandler = new Handler();
然後,我必須在MainActivity以下兩種方法來更新搜索條,如媒體播放器的音頻播放:
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);
}
我面臨的問題是,當音頻運行時,用戶使用設備返回按鈕關閉應用程序。我得到NullPointerException。破壞活動的方法是:
@Override
protected void onDestroy() {
super.onDestroy();
if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
該API是seekHandler.removeCallbacksAndMessages(null); – Sandeep