如何防止 activity 使用以前的 InstanceState 数据重新启动

Question

我有一个从主 activity 打开的 activity。当它使用后退按钮关闭然后重新启动时，它使用以前的实例状态打开而不是像新的一样打开。

主要activity

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

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

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();
 }

我确定我缺少的是简单的东西。

总结：我希望应用程序在屏幕方向发生变化时表现良好，但是当用户按下后退按钮时，我希望之前的状态消失。

Answer 1

在 PerformActivity.This 中添加此代码将在按下后退按钮时完成 activity。

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

如何防止 activity 使用以前的 InstanceState 数据重新启动

How to prevent activity re-starting with previous InstanceState data

android

android-activity

instancestate