Call requestPermissions from Asynctask

Question

I'm trying to request permissions from AsyncTask called by a android.support.v4.app.Fragment.

On doInBackground method has this piece of code

     int hasWriteContactsPermission = ContextCompat.checkSelfPermission((Context)ctx,
                Manifest.permission.SEND_SMS);

        if (hasWriteContactsPermission != PackageManager.PERMISSION_GRANTED) {
            if (!ActivityCompat.shouldShowRequestPermissionRationale((AppCompatActivity)ctx,
                    Manifest.permission.SEND_SMS)) {
                showMessageOKCancel("Necessary permissions", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                requestPermissions(new String[]{Manifest.permission.SEND_SMS},
                                        REQUEST_CODE_ASK_PERMISSIONS);
                            }
                        });
                return;
            }

           /******** PROBLEM
     requestPermissions(new String[] {Manifest.permission.SEND_SMS},
                    REQUEST_CODE_ASK_PERMISSIONS);

*************/
            return;
        }

Calling requestPermissions through AppCompatActivity is not valid for me because i need to catch onRequestPermissionsResult in Fragment, not in Activity

The problem is that requestPermissions says this error:

Cannot resolve method requestPermissions 

How can i call requestPermissions method from Asynctask to catch the result on the caller Fragment?

Answer 1

Actually you cannot ask for permission inside the doInBackground method, because as the name says, it is doing work in backgorund, and requesting permissions to the user needs to use UI thread. I suggest to you calling a request permission like this:

    public void checkPermissions() {
    final String[] permissions = new String[]{Manifest.permission.SEND_SMS}

    if ( ContextCompat.checkSelfPermission(this,
            android.Manifest.permission.SEND_SMS )
            != PackageManager.PERMISSION_GRANTED ) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                android.Manifest.permission.SEND_SMS )){

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Permission Needed");
            builder.setMessage("You must accept the permission.");
            builder.setPositiveButton(R.string.global_ok, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    ActivityCompat.requestPermissions(ConfigurarActivity.this,
                            permissions,
                            PERMISSION_REQUEST);
                }
            });
            builder.setNegativeButton(R.string.global_cancel, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.dismiss();
                }
            });
            AlertDialog dialog = builder.create();
            dialog.show();
        } else {
            ActivityCompat.requestPermissions(this,
                    permissions,
                    PERMISSION_REQUEST);
        }
    }else{
        //doTaskThatNeedThePermission can be async
    }
}

Answer 2

You can execute requestPermissions if you have an Activity reference

// in your Activity
final Activity act = this;

// onClick
act.requestPermissions(new String[]{Manifest.permission.SEND_SMS},
    REQUEST_CODE_ASK_PERMISSIONS);