protected void askAllPermissions() {
    Toast.makeText(MainActivity.this, "before 1", Toast.LENGTH_LONG).show();
    while(!askPermission(Manifest.permission.ACCESS_COARSE_LOCATION)) {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        }
    }
    Toast.makeText(MainActivity.this, "after 1", Toast.LENGTH_LONG).show();

    if (permissionValue != 1) {
        Toast.makeText(MainActivity.this, R.string.permission_required, Toast.LENGTH_LONG).show();
        finish();
    }

    dialogDisplayed = false;
    permissionValue = 0;
    permissionAnswered=false;

    Toast.makeText(MainActivity.this, "before 2", Toast.LENGTH_LONG).show();

    while(!askPermission(Manifest.permission.READ_PHONE_STATE)) {
        try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); }
    }

    Toast.makeText(MainActivity.this, "after 2", Toast.LENGTH_LONG).show();

    if (permissionValue != 1) {
        Toast.makeText(MainActivity.this, R.string.permission_required, Toast.LENGTH_LONG).show();
        finish();
    }

    dialogDisplayed = false;
    permissionValue = 0;
    permissionAnswered=false;

    while(!askPermission(Manifest.permission.CALL_PHONE)) {
        try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); }
    }

    if (permissionValue != 1) {
        Toast.makeText(MainActivity.this, R.string.permission_required, Toast.LENGTH_LONG).show();
        finish();
    }


}

protected boolean askPermission(String permmission) {
    if (ContextCompat.checkSelfPermission(MainActivity.this, permmission) != PackageManager.PERMISSION_GRANTED) {
        if (!dialogDisplayed) {
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{permmission},
                    REQUEST_ACCESS_RESPONSE);
            dialogDisplayed = true;
        }
            // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
            // app-defined int constant. The callback method gets the
            // result of the request.
    } else {
        permissionValue = 1;
        permissionAnswered=true;
    }

    return permissionAnswered;
}

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

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