tests/LockTaskTests/src/com/google/android/example/locktasktests/LaunchActivity.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.google.android.example.locktasktests;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.view.View;
import android.widget.EditText;

public class LaunchActivity extends Activity {

    Runnable mBackgroundPolling;
    boolean mRunning;
    Handler mHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_launch);
        mBackgroundPolling = new Runnable() {
            @Override
            public void run() {
                if (!mRunning) {
                    return;
                }
                ActivityManager activityManager =
                        (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
                final int color = activityManager.getLockTaskModeState() !=
                        ActivityManager.LOCK_TASK_MODE_NONE ? 0xFFFFC0C0 : 0xFFFFFFFF;
                findViewById(R.id.root_launch).setBackgroundColor(color);
                mHandler.postDelayed(this, 1000);
            }
        };
        mHandler = new Handler(Looper.getMainLooper());
    }

    @Override
    public void onResume() {
        super.onResume();
        mRunning = true;
        mBackgroundPolling.run();
    }

    @Override
    public void onPause() {
        super.onPause();
        mRunning = false;
    }

    public void onTryLock(View view) {
        startLockTask();
    }

    public void onTryUnlock(View view) {
        stopLockTask();
    }

    public void onLaunchMain(View view) {
        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
    }
}