samples/DeviceAdminWhitelistedAccount/src/com/example/android/app/admin/whitelistedaccount/MyMain.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.app.admin.whitelistedaccount;

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.Toast;

public class MyMain extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final Context context = getApplicationContext();

        new AsyncTask<Void, Void, Boolean>() {
            @Override
            protected Boolean doInBackground(Void... voids) {
                return MyAuthenticator.setUpAccount(context);
            }

            @Override
            protected void onPostExecute(Boolean ret) {
                Toast.makeText(context,
                        (ret ? "Account created" : "Account already exists"),
                        Toast.LENGTH_SHORT).show();

            }
        }.execute();

        finish();
    }
}