在onActivityResult中弹出DialogFragment的解决方案 activity和fragment

最新推荐文章于 2020-12-23 13:33:49 发布

原创最新推荐文章于 2020-12-23 13:33:49 发布 · 701 阅读

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当在onActivityResult中需要弹出DialogFragment时，可以通过设置一个标志并利用onResumeFragments方法来实现。首先在onActivityResult中设置mShowDialog为true，然后在onResumeFragments中检查该标志，如果为true则显示DialogFragment。另一种解决方案是使用Handler延迟创建和显示DialogFragment，以确保在正确的时机执行。

http://stackoverflow.com/a/15802094/1290235

[java] view plain copy
private boolean mShowDialog = false;  
  
@Override  
protected void onActivityResult(int requestCode, int resultCode, Intent data){  
  super.onActivityResult(requestCode, resultCode, data);  
  
  // remember that dialog should be shown  
  mShowDialog = true;  
}  
  
@Override  
protected void onResumeFragments() {  
  super.onResumeFragments();  
  
  // play with fragments here  
  if (mShowDialog) {  
    mShowDialog = false;  
  
    // Show only if is necessary, otherwise FragmentManager will take care  
    if (getSupportFragmentManager().findFragmentByTag(PROG_DIALOG_TAG) == null) {  
      new ProgressFragment().show(getSupportFragmentManager(), PROG_DIALOG_TAG);  
    }  
  }  
}  
[java] view plain copy
  
[java] view plain copy
I took a look at the source for FragmentActivity, and it looks like it's calling an internal fragment manager in order to resume fragments without losing state.  
  
I found a solution that's not listed here. I create a Handler, and start the dialog fragment in the Handler. So, editing your code a bit:  
  
onActivityResult(int requestCode, int resultCode, Intent data) {  
  
   //other code  
  
   final FragmentManager manager = getActivity().getSupportFragmentManager();  
   Handler handler = new Handler();  
   handler.post(new Runnable() {  
       public void run() {  
           ProgressFragment progFragment = new ProgressFragment();    
           progFragment.show(manager, PROG_DIALOG_TAG);  
       }  
   });   
  
  // other code  
}