com/android/server/location/injector/SystemScreenInteractiveHelper.java

/*
 * Copyright (C) 2020 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.android.server.location.injector;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.UserHandle;

import com.android.internal.util.Preconditions;
import com.android.server.FgThread;

/**
 * Provides accessors and listeners for screen interactive state (screen on/off).
 */
public class SystemScreenInteractiveHelper extends ScreenInteractiveHelper {

    private final Context mContext;

    private boolean mReady;

    private volatile boolean mIsInteractive;

    public SystemScreenInteractiveHelper(Context context) {
        mContext = context;
    }

    /** Called when system is ready. */
    public void onSystemReady() {
        if (mReady) {
            return;
        }

        IntentFilter screenIntentFilter = new IntentFilter();
        screenIntentFilter.addAction(Intent.ACTION_SCREEN_OFF);
        screenIntentFilter.addAction(Intent.ACTION_SCREEN_ON);
        mContext.registerReceiverAsUser(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                boolean interactive;
                if (Intent.ACTION_SCREEN_ON.equals(intent.getAction())) {
                    interactive = true;
                } else if (Intent.ACTION_SCREEN_OFF.equals(intent.getAction())) {
                    interactive = false;
                } else {
                    return;
                }

                onScreenInteractiveChanged(interactive);
            }
        }, UserHandle.ALL, screenIntentFilter, null, FgThread.getHandler());

        mReady = true;
    }

    void onScreenInteractiveChanged(boolean interactive) {
        if (interactive == mIsInteractive) {
            return;
        }

        mIsInteractive = interactive;
        notifyScreenInteractiveChanged(interactive);
    }

    @Override
    public boolean isInteractive() {
        Preconditions.checkState(mReady);
        return mIsInteractive;
    }
}