在具有Intent.ACTION_GET_CONTENT的startActivityForResult()之后未调用onActivityResult() [英] onActivityResult() not called after startActivityForResult() with Intent.ACTION_GET_CONTENT

问题描述

我的主Activity拥有不同的Fragment，一个片段使用户可以打开DialogFragment.该对话框将打开一个声音文件列表，并且该对话框还包含一个添加"按钮，用户应该可以从中添加自己的声音文件.为此，我想使用标准的Android文件选择功能并使用Intent.ACTION_GET_CONTENT.因此，当用户按下添加"按钮，并且按需启动Android文件选择功能时，我就消除了这种意图，但是当我选择一个文件时，什么也没有发生.我希望可以触发我的主要活动的onActivityResult()，但是它不会触发，并且我无法使其正常工作，并且我不理解为什么这不起作用.

I got my main Activity which holds different Fragment's, one fragment gives the user a possibility to open a DialogFragment. That dialog opens a list of sound files and the dialog also contains a 'Add' button from which the user should be able to add her own soundfile. To do this I thought to use the standard Android file picking functionality and make use of the Intent.ACTION_GET_CONTENT. So I fire away this intent when the user presses the 'Add' button and the Android file picking functionality comes up as it should, but when I choose a file, nothing happens what so ever. I would expect the onActivityResult()of my main activity to be triggered but it doesn't, and I can't get it to work and I don't understand why this doesn't work.

public class MyDialog extends DialogFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Rest omitted...
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    return new AlertDialog.Builder(context)
            .setIcon(android.R.drawable.ic_dialog_info) 
            .setTitle(R.string.TONE_PROMPT_TITLE)       

            .setNeutralButton(R.string.ADD, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent intent = new Intent();
                    intent.setAction(Intent.ACTION_GET_CONTENT);
                    intent.setType("audio/mpeg");
                    getActivity().startActivityForResult(intent, ADD_SOUND_REQUEST_CODE);
                }
            })

            .create();
}

}

我还试图通过以下方式实例化意图: Intent intent = new Intent(getActivity(), MyActivity.class); 但这也不起作用.

I have also tried to instantiate the intent the following way: Intent intent = new Intent(getActivity(), MyActivity.class); but this doesn't work either.

任何想法都会非常有帮助，谢谢！

Any ideas would be really helpful, thanks!

推荐答案

设法找出问题所在... 在清单中，我已将Activity声明为android:noHistory="false"，这就是问题所在.将其设置为android:noHistory="true"以进行我的活动并按以下方式触发Intent后，它就像一种魅力一样工作.

Managed to figure out what the problem was... In my manifest I have declared my Activity as android:noHistory="false" and this was the problem. After setting it to android:noHistory="true" for my activity and firing my Intentthe following way it worked like a charm.

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("audio/mpeg");           
getActivity().startActivityForResult(intent, ADD_SOUND_REQUEST_CODE);

就像这样，我的活动中的onActivityResult()会被触发，此后，我遵循@ Rohit5k2的关于如何触发Fragment的OnActivityResult()的建议，并且一切都非常好！

And just like that, the onActivityResult() in my activity was triggered just as it should and after that I followed @Rohit5k2's advice on how to get my Fragment's OnActivityResult() triggered and all has worked really great!

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    MyFragment fragmentObject = getSupportFragmentManager().findFragmentById(R.id.container);
    fragmentObject.onActivityResult(requestCode, resultCode, data);
}

谢谢大家的帮助！

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