6.0 holes stepped by fragment request permission in the system

6.0 It's been a long time since I came out , The project is not equipped 6.0 Caused a lot of permissions BUG. After that, I saw Hong Yang's Blog, Basically know how to request permission , Administrative authority .

But recently found in Fragment There is something wrong with the permission request in .

There are two pits ： One is Fragment The way of request in , The second one is Fragment Request permission callback in .

 

How to achieve Fragment Permission requests in

see Blog We all know , Permission can be requested in the following ways , The simulated request here is GPS Location jurisdiction

 

private void checkBlueToothPermission() {
        if (Build.VERSION.SDK_INT >= 23) {
            boolean hasLocationPermission =
                    ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED;
            if (!hasLocationPermission) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_ENABLE_BT);
            }
        }
    }

 

 

But in Fragment We can't pass ActivityCompat.requestPermissions To request , Because of this paper request Fragment Can't receive onRequestPermissionsResult. So we should directly use XXXfragment.this.requestPermissions To request permission .

 

Fragment Request permission callback

Maybe I wonder , Maybe everyone dalao The project will not have such problems , But this problem happened in my project . I'm asking for it according to the above XXXfragment.this.requestPermissions To request permission , But my Fragment Still can't receive onRequestPermissionsResult Callback .

 

Observe the project and find , In this Fragment Of Activity There are the same permission requests , There are also onRequestPermissionsResult. But every time I ask , Will be Activity Of onRequestPermissionsResult Intercepted , and Fragment There will never be onRequestPermissionsResult Callback .

 

So I found out , stay Activity Medium onRequestPermissionsResult No call to super.onRequestPermissionsResult(requestCode, permissions, grantResults);   When I add it, there is a magical effect ,Fragment You can receive onRequestPermissionsResult It's called back ！！！

I found that the source code did something for me ：

 

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
            @NonNull int[] grantResults) {
        int index = (requestCode>>16)&0xffff;
        if (index != 0) {
            index--;

            // there mPendingFragmentActivityResults It's using SparseArrayCompat structure 
	    // Store requestCode And specific requests Fragment.
	    String who = mPendingFragmentActivityResults.get(index);
            mPendingFragmentActivityResults.remove(index);
            if (who == null) {
                Log.w(TAG, "Activity result delivered for unknown Fragment.");
                return;
            }
            Fragment frag = mFragments.findFragmentByWho(who);			// find Fragment And callback 
            if (frag == null) {
                Log.w(TAG, "Activity result no fragment exists for who: " + who);
            } else {
                frag.onRequestPermissionsResult(requestCode&0xffff, permissions, grantResults);
            }
        }
    }	    // Store requestCode And specific requests Fragment.
	    String who = mPendingFragmentActivityResults.get(index);
            mPendingFragmentActivityResults.remove(index);
            if (who == null) {
                Log.w(TAG, "Activity result delivered for unknown Fragment.");
                return;
            }
            Fragment frag = mFragments.findFragmentByWho(who);			// find Fragment And callback 
            if (frag == null) {
                Log.w(TAG, "Activity result no fragment exists for who: " + who);
            } else {
                frag.onRequestPermissionsResult(requestCode&0xffff, permissions, grantResults);
            }
        }
    }

 

 

 

 

 

 

 

Remember Activity Permission is also requested in , Remember in onRequestPermissionsResult Add... To the callback super The callback .

Don't accidentally delete the callback like me and look confused