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/*
* Copyright (C) 2010 ZXing authors
*
* 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.zxing.client.android;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Handler;
/**
* Finishes an context after a period of inactivity if the device is on battery power.
*/
public final class InactivityTimer {
private static final String TAG = InactivityTimer.class.getSimpleName();
private static final long INACTIVITY_DELAY_MS = 5 * 60 * 1000L;
private final Context context;
private final BroadcastReceiver powerStatusReceiver;
private boolean registered = false;
private Handler handler;
private Runnable callback;
private boolean onBattery;
public InactivityTimer(Context context, Runnable callback) {
this.context = context;
this.callback = callback;
powerStatusReceiver = new PowerStatusReceiver();
handler = new Handler();
}
/**
* Trigger activity, resetting the timer.
*/
public void activity() {
cancelCallback();
if (onBattery) {
handler.postDelayed(callback, INACTIVITY_DELAY_MS);
}
}
/**
* Start the activity timer.
*/
public void start() {
registerReceiver();
activity();
}
/**
* Cancel the activity timer.
*/
public void cancel() {
cancelCallback();
unregisterReceiver();
}
private void unregisterReceiver() {
if (registered) {
context.unregisterReceiver(powerStatusReceiver);
registered = false;
}
}
private void registerReceiver() {
if (!registered) {
context.registerReceiver(powerStatusReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
registered = true;
}
}
private void cancelCallback() {
handler.removeCallbacksAndMessages(null);
}
private void onBattery(boolean onBattery) {
this.onBattery = onBattery;
// To make sure we're still running
if (registered) {
// This will either cancel or reschedule, depending on the battery status.
activity();
}
}
private final class PowerStatusReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())) {
// 0 indicates that we're on battery
final boolean onBatteryNow = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) <= 0;
// post on handler to run in main thread
handler.post(() -> onBattery(onBatteryNow));
}
}
}
}
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