Android marshmallow request permission?

Question

Open a Dialog using the code below:

 ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    1);

Get the Activity result as below:

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 1: {

          // 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.          
            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
            }
            return;
        }

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

More info: https://developer.android.com/training/permissions/requesting.html

This structure I am using to check if my app has permission and than request if it does not have permission. So in my main code from where i want to check write following :

int MyVersion = Build.VERSION.SDK_INT;
if (MyVersion > Build.VERSION_CODES.LOLLIPOP_MR1) {
                if (!checkIfAlreadyhavePermission()) {
                    requestForSpecificPermission();
                }
}

Module checkIfAlreadyhavePermission() is implemented as :

private boolean checkIfAlreadyhavePermission() {
    int result = ContextCompat.checkSelfPermission(this, Manifest.permission.GET_ACCOUNTS);
    if (result == PackageManager.PERMISSION_GRANTED) {
        return true;
    } else {
        return false;
    }
}

Module requestForSpecificPermission() is implemented as :

private void requestForSpecificPermission() {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.GET_ACCOUNTS, Manifest.permission.RECEIVE_SMS, Manifest.permission.READ_SMS, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 101);
}

and Override in Activity :

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case 101:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //granted
            } else {
                //not granted
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

Refer this link for more details : http://revisitingandroid.blogspot.in/2017/01/how-to-check-and-request-for-run-time.html

Starting in Android Marshmallow, we need to request the user for specific permissions. We can also check through code if the permission is already given. Here is a list of commonly needed permissions:

• android.permission_group.CALENDAR

  • android.permission.READ_CALENDAR
  • android.permission.WRITE_CALENDAR

• android.permission_group.CAMERA

  • android.permission.CAMERA

• android.permission_group.CONTACTS

  • android.permission.READ_CONTACTS
  • android.permission.WRITE_CONTACTS
  • android.permission.GET_ACCOUNTS

• android.permission_group.LOCATION

  • android.permission.ACCESS_FINE_LOCATION
  • android.permission.ACCESS_COARSE_LOCATION

• android.permission_group.MICROPHONE

  • android.permission.RECORD_AUDIO

• android.permission_group.PHONE

  • android.permission.READ_PHONE_STATE
  • android.permission.CALL_PHONE
  • android.permission.READ_CALL_LOG
  • android.permission.WRITE_CALL_LOG
  • android.permission.ADD_VOICEMAIL
  • android.permission.USE_SIP
  • android.permission.PROCESS_OUTGOING_CALLS

• android.permission_group.SENSORS

  • android.permission.BODY_SENSORS

• android.permission_group.SMS

  • android.permission.SEND_SMS
  • android.permission.RECEIVE_SMS
  • android.permission.READ_SMS
  • android.permission.RECEIVE_WAP_PUSH
  • android.permission.RECEIVE_MMS
  • android.permission.READ_CELL_BROADCASTS

• android.permission_group.STORAGE

  • android.permission.READ_EXTERNAL_STORAGE
  • android.permission.WRITE_EXTERNAL_STORAGE

Here is sample code to check for permissions:

if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
    if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.WRITE_CALENDAR)) {
        AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
        alertBuilder.setCancelable(true);
        alertBuilder.setMessage("Write calendar permission is necessary to write event!!!");
        alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
            public void onClick(DialogInterface dialog, int which) {
                ActivityCompat.requestPermissions((Activity)context, new String[]{Manifest.permission.WRITE_CALENDAR}, MY_PERMISSIONS_REQUEST_WRITE_CALENDAR);
            }
        });
    } else {
        ActivityCompat.requestPermissions((Activity)context, new String[]{Manifest.permission.WRITE_CALENDAR}, MY_PERMISSIONS_REQUEST_WRITE_CALENDAR);
    }
}

I have used this wrapper (Recommended) written by google developers. Its super easy to use.

https://github.com/googlesamples/easypermissions

Function dealing with checking and ask for permission if required

public void locationAndContactsTask() {
    String[] perms = { Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.READ_CONTACTS };
    if (EasyPermissions.hasPermissions(this, perms)) {
        // Have permissions, do the thing!
        Toast.makeText(this, "TODO: Location and Contacts things", Toast.LENGTH_LONG).show();
    } else {
        // Ask for both permissions
        EasyPermissions.requestPermissions(this, getString(R.string.rationale_location_contacts),
                RC_LOCATION_CONTACTS_PERM, perms);
    }
}

Happy coding :)