Request runtime permissions from v4.Fragment and h

问题:

I'm having a weird issue that is causing a conflict. I had to switch to native Fragments to fix it, but there are bugs with that.

My original problem: I have a navigation drawer setup with v4 Fragments. To ask for permission in one of my Fragments I call ActivityCompat.requestPermissions(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION, 1); The prompt shows up just fine, but when I accept or deny the permission, nothing happens. The callback onRequestPermissionsResult() is never called. Instead it gets called in the Activity that my Fragments are attached to. Useless to me, I need the callback to work in the Fragment.

With this in mind I was told that I need to use FragmentCompat, but that only works with native Fragments (v13+), so I changed navigation drawer to work from native Fragments instead of the v4 support library Fragments. However, because I'm using AppCompatActivity, certain things do not work, like addToBackStack() and going back to a previous fragment.

Long story short, does anyone know how I can use the v4.Fragment and still call for permission in the Fragment and get the callback to be in the Fragment? I feel like this is a bug in Android that hasn't been addressed but I'm not 100%.

Let me know if you need to see my code, it's just the standard methods that you need for runtime permissions, I would like to work with v4 Fragments though which doesn't work from my understanding.

回答1:

This behavior seems to be present in the v4 Fragment support class requestPermissions in Fragment. The Activity/FragmentCompat implementations exist for people who wish to use the native classes with the extended functionality on API levels between 11 and 23.

回答2:

Adding this to the parent activity works for me:

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    List<Fragment> fragments = getSupportFragmentManager().getFragments();
    if (fragments != null) {
        for (Fragment fragment : fragments) {
            fragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

Source: https://code.google.com/p/android/issues/detail?id=189121#c5

回答3:

If you need to get the permissionResult in fragment v4 make sure you use

Fragment.requestPermission(String[], int);

instead of

AppCompat.requestPermission(Activity, String[], int)

Check out this answer!

回答4:

You can use this part of code

requestPermissions(new String[]{Manifest.permission.GET_ACCOUNTS}, PERMISSION_REQUEST_CODE);

回答5:

I faced the same situation recently, when I needed to check for a permission inside the support fragment and get a callback there.

I was able to use ContextCompat to checkSelfPermission and then as @NasaGeek said called android.support.v4.app.Fragment's requestPermissions to request the permission and then got a call back to onRequestPermissionsResult in v4 Fragment.

Hope this helps.

Thanks.

回答6:

v4.Fragment works well. I have an issue with nested fragment of v4.Fragment. Permission is asked, but the callback onRequestPermissionsResult() is never called in nested fragment!

Issue opened

回答7:

At the moment the most stable solution is doing it by hand. I myself resolved it simply by notifying child fragments from the parent fragments.

if (fragment.getParentFragment() != null) {
                            Fragment parentFragment = fragment.getParentFragment();
                            try {
                                ChildFragmentPermissionRegistry registry = (ChildFragmentPermissionRegistry) parentFragment;
                                registry.registerPermissionListener((ChildFragmentPermissionCallback) fragment);
                                parentFragment.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_REQUEST_CODE);
                            } catch (ClassCastException e) {
                                Log.e(PermissionVerifier.class.getSimpleName(), e.getMessage());
                            }
                        } else {
                            fragment.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_REQUEST_CODE);
                        }

Where parent fragment implements interface ChildFragmentPermissionRegistry and registers child fragment,

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (callback != null) {
        callback.onRequestPermissionsResult(requestCode, permissions, grantResults);
        callback = null;
    }
}

and child fragments implements ChildFragmentPermissionCallback

and interfaces are something like this:

public interface ChildFragmentPermissionCallback {
    void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults);
}

public interface ChildFragmentPermissionRegistry {
    void registerPermissionListener(ChildFragmentPermissionCallback callback);
}

回答8:

I don't know if it's recently fixed by google, but I can reach the expected result without doing any tricks.

The most important thing is to call super.onRequestPermissionsResult(requestCode, permissions, grantResults); in the activity, so it will pass the result to fragment if it's requested from fragment.

So, what I do is:

1) in fragment, ask permission using v4 fragment.requestPermissions(permissions, requestCode)

2) in activity's onRequestPermissionsResult, must call super.onRequestPermissionsResult(requestCode, permissions, grantResults);

3) in fragment's onRequestPermissionsResult, write the code I want to handle the result.

回答9:

In my case I have requested the permission from the fragment and also need to get the response in fragment.

But my phone running on android 8.1

so I was need to add one more condition for check this

so eventually there is my solution

private void doOnWazeButtonClick()
{
    int permissionStatus = PackageManager.PERMISSION_DENIED;

    if (getContext() != null)
    {
        permissionStatus = ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION);
    }

    if (permissionStatus == PackageManager.PERMISSION_GRANTED)
    {
        showContentWaze();
    }
    else
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
        {
            Objects.requireNonNull(getActivity()).requestPermissions(new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE_PERMISSION_ACCESS_FINE_LOCATION);
        }
        else
        {
            requestPermissions(new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE_PERMISSION_ACCESS_FINE_LOCATION);
        }
    }
}

回答10:

Just use requestPermission("your permission/s in string array",your request code) simply no need to use Fragment.requestPermissons(String[],int );

This method in your fragment calls requestPermissions of android.support.v4.app.Fragment class i.e

public final void requestPermissions(@NonNull String[] permissions, int requestCode) {
        if (mHost == null) {
            throw new IllegalStateException("Fragment " + this + " not attached to Activity");
        }
        mHost.onRequestPermissionsFromFragment(this, permissions, requestCode);
    }