Fragment中调用onActivityForResult处理

最新推荐文章于 2021-11-24 08:23:52 发布

转载最新推荐文章于 2021-11-24 08:23:52 发布 · 5.5k 阅读

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#onactivity #activity #fragment #android #处理结果

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本文讨论了在Android应用开发中，Fragment如何正确使用startActivityForResult来处理Activity返回的结果，避免了由Activity直接接收并处理这些结果的情况。通过在Fragment内部直接调用startActivityForResult方法，并确保调用getActivity().startActivityForResult方法时使用正确的参数，可以确保Fragment正确接收到并处理来自外部Activity的结果。同时，文章提供了解决方案，确保Fragment在适当情况下捕获并响应来自外部交互（如相机应用）的反馈。

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The activity hosting this fragment has its onActivityResult called when the camera activity returns

My fragment starts an activity for result with the intent sent for the camera to take a picture. The picture application loads fine, takes a picture, and returns. The onActivityResult however is never hit. I’ve set break points but nothing is triggered. Can a fragment have onActivityResult? I’d think so since its a provided function. Thoughts on why this isn’t being triggered?

ImageView myImage = (ImageView)inflatedView.findViewById(R.id.image);
myImage.setOnClickListener(new OnClickListener() { 
    @Override 
    public void onClick(View view) {
        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(cameraIntent, 1888);
    } 
}); 

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if( requestCode == 1888 ) {
        Bitmap photo = (Bitmap) data.getExtras().get("data");
        ((ImageView)inflatedView.findViewById(R.id.image)).setImageBitmap(photo);
    } 
}

So I figured out the problem and will post the answer for anyone else experiencing this issue. The hosting activity overrode the onActivityResult but did not make a call to super.onActivityResult for unhandled result codes. Apparently even though the fragment is the one making the startActivityForResult call, the activity gets the first shot at handling the result. This makes sense when you consider the modularity of fragments. Once I implemented super.onActivityResult for all unhandled results, the fragment got a shot at handling the result.

And also from @siqing answer

To get the result in your fragment make sure you call : startActivityForResult(intent,111);instead of
getActivity().startActivityForResult(intent,111); inside your fragment.

解决方法就是:
在Fragment中直接调用startActivityForResult()方法，
而不是调用 getActivity().startActivityForResult()。

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