如何监听DialogFragment的dismiss事件

Question

我已经实现了一个自定义的DialogFragment，我在postReviewFragment中的RatingBar评分监听事件中显示它，当用户关闭对话框时，我想将我的RatingBar评分设置回0。在SO上搜索后，我找到了这些线程，但解决方案似乎对我不起作用： DialogFragment Close Event Can't use onDismiss() when using custom dialogs DialogFragment and onDismiss 到目前为止，我尝试使用上述线程实现以下内容：

在postReviewFragment上实现DialogInterface.OnDismissListener并覆盖onDismiss()方法

   @Override
    public void onDismiss(final DialogInterface dialog) {

        userRating.setRating(0);

    }

在DialogFragment中，我重写了onDismiss()方法

@Override
public void onDismiss(DialogInterface dialog) {
    super.onDismiss(dialog);
    final Fragment parentFragment = getParentFragment();
    if (parentFragment instanceof DialogInterface.OnDismissListener) {
        ((DialogInterface.OnDismissListener) parentFragment).onDismiss(dialog);
    }
}

但是当DialogFragment被解除时，onDismiss()方法仍然没有触发，我做错了什么？

- RamithDR

Answer 1

好的，我成功地解决了它：

1. First of all make sure you've implemented DialogInterface.OnDismissListener and overriden onDismiss() method on both DialogFragment and the Fragment showing the dialog.

2. Then when you show the DialogFragment set a target fragment, here I pass the rating via a Bundle to the DialogFragment

   android.support.v4.app.FragmentManager fm = getActivity().getSupportFragmentManager();
               PostReviewDialogFragment dialog = new PostReviewDialogFragment();
   
               // optionally pass arguments to the dialog fragment
               Bundle args = new Bundle();
               args.putInt("usersRating", rating);
               dialog.setArguments(args);
   
               dialog.setTargetFragment(RestaurantReviewFragment.this,REVIEW_FRAGMENT);
   
   
               dialog.show(fm, TAG);
   

3. On DialogFraments's onDismiss() method I set the rating to 0 and add it to an intent extra and set ratingbar in dialogFragment to user selected value.

   Intent i = new Intent()
           .putExtra("rating1", rating);
   getTargetFragment().onActivityResult(getTargetRequestCode(), Activity.RESULT_OK, i);
   

4. Then I override onActivityResult() method to read the values and set ratingbar value on the fragment to 0 when dismissed.

这可能不是最佳方法，但它可以工作。如果我找到比这种方法更好的方法，我会更新答案。如果我的解释不太清楚，请查看下面的线程以获取更详细的解释。

参考文献： 如何从DialogFragment发送数据到Fragment？

- RamithDR

Answer 2

使用可用的OnDismissListener。

dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
                    public void onDismiss(DialogInterface dialog) {
                        MainActivity.this.finish();
                    }
                });

- Srikar Reddy

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这是危险的，因为它会覆盖DialogFragments内部的dismiss监听器。 - M. Smith