prebuilts/gradle/DeviceOwner/Application/src/main/java/com/example/android/deviceowner/MainActivity.java

/*
 * Copyright (C) 2015 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.deviceowner;

import android.app.Activity;
import android.app.Fragment;
import android.app.admin.DevicePolicyManager;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_real);
        if (savedInstanceState == null) {
            DevicePolicyManager manager =
                    (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
            if (manager.isDeviceOwnerApp(getApplicationContext().getPackageName())) {
                // This app is set up as the device owner. Show the main features.
                Log.d(TAG, "The app is the device owner.");
                showFragment(DeviceOwnerFragment.newInstance());
            } else {
                // This app is not set up as the device owner. Show instructions.
                Log.d(TAG, "The app is not the device owner.");
                showFragment(InstructionFragment.newInstance());
            }
        }
    }

    private void showFragment(Fragment fragment) {
        getFragmentManager().beginTransaction()
                .replace(R.id.container, fragment)
                .commit();
    }

}