android-testing-runtime-permissions-checking-permissions

MainActivity.java

@Override
protected void onResume() {  
    super.onResume();

    int permissionStatus = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS);
    if (permissionStatus == PackageManager.PERMISSION_GRANTED) {
        loadContacts();
    } else if (!isPermissionAlreadyDenied) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CONTACTS},
                    REQ_CODE_PERMISSIONS_READ_CONTACTS);
    }
}