Android permissions: Perform task after user pressed “Allow”

问题

I would like to know if there is a way we can identify the event when the user has pressed "Allow" button for contact details access/ calendar access etc.,

I know there is a way to ask for permissions with the ActivityCompat.requestPermissions but is there a way to perform an action right after the user grants a permission?

回答1:

First Define the variable:

public static int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;

request permission using:

if (ActivityCompat.checkSelfPermission(this,
        android.Manifest.permission.ACCESS_FINE_LOCATION)
        != PackageManager.PERMISSION_GRANTED) {
    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(this,
            android.Manifest.permission.ACCESS_FINE_LOCATION)) {
        // Show an explanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.
    } else {
        // No explanation needed, we can request the permission.
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
}

now catch the result using:

     @Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION : {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.
                Toast.makeText(getApplicationContext(), "Permission granted", Toast.LENGTH_SHORT).show();

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(getApplicationContext(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

FOR FRAGMENT

if you are trying this code in a fragment, change

checkSelfPermission()

ActivityCompact.checkSelfPermission()

and Also change

ActivityCompat.requestPermissions()

requestPermissions()

Handling of Permission Result (Allow or Deny) are same as activity.

For a More Complete Example See This Answer Here

回答2:

I used this code for that very purpose.

   public boolean isPermissionGranted() {

    if (Build.VERSION.SDK_INT >= 23) {
        if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.CAMERA)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v(TAG, "Permission is granted");
            return true;
        } else {
            ActivityCompat.requestPermissions(this, new String[]{
                    Manifest.permission.CAMERA
            }, 1);
            return false;
        }
    } else { //permission is automatically granted on sdk<23 upon installation
        Log.v(TAG, "Permission is granted");
        return true;
    }

}

You can then call :

    if(isPermissionGranted())
    {
       // do your stuff
    }

回答3:

Call requestPermissions() to request the permissions. You find out the result in onRequestPermissionsResult() and can determine if they granted the permission or not. That is "right after", from the standpoint of your app's code.

来源：https://stackoverflow.com/questions/41620466/android-permissions-perform-task-after-user-pressed-allow

标签

android

android-permissions