如何防止活动从以前的InstanceState数据重新开始

Question

我有一项活动是从我的主要活动开始的。当它被关闭，使用后退按钮，然后重新启动，它是打开使用上一个实例，而不是打开，好像它是新的。

主要活动

​

	public void onPerformButtonClick(View view)
	{
    	Intent performActivity = new Intent(getBaseContext(), PerformActivity.class);

    	//start lyric activity
        startActivityForResult(performActivity, MAIN_PERFORM_MODE);		
		
	}

​

The PerformActivity

​

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

        setContentView(R.layout.perform_main);

		//reload state on orientation change or wake up
		if (savedInstanceState != null) {

			if (mPlayList == null) {
				mPlayList = new PlayList(getBaseContext());
			}
			mPlayList.removePlayListListener();
			mPlayList.setPlayListListener(new PlayListListener() {
				@Override
				public void onPlayListDataUpdate() {
					updateSetListData();
				}
			});
			mPlayList.loadState(savedInstanceState.getBundle("playlist"));

			if (mTimeLine == null) {
				mTimeLine = new TimeLine();
			}
			mTimeLine.removeTimeLineListener();
			mTimeLine.loadState(savedInstanceState.getBundle("timeline"));
		}

     .....

	}

	@Override
	protected void onSaveInstanceState (Bundle outState) {

		super.onSaveInstanceState(outState);

		Bundle playlist = mPlayList.saveState();
		outState.putBundle("playlist", playlist);

		Bundle timeline = mTimeLine.saveState();
		outState.putBundle("timeline", timeline);

	}

	private void doFinish()
	{
		finish();
	}

​

我确信这是一件很简单的事情，我错过了。

概括地说:我希望应用程序在屏幕方向变化的情况下表现良好，但是当用户按下后退按钮时，我希望先前的状态消失。

Answer 1

在PerformActivity.This中添加此代码将完成按回按钮上的活动。

@Override
public void onBackPressed() {
   if(null!=this){
       finish();
   }
   super.onBackPressed();
}