| /* |
| * 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.app.Activity; |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Finishes an activity after a period of inactivity if the device is on battery power. |
| */ |
| final class InactivityTimer { |
| |
| private static final int INACTIVITY_DELAY_SECONDS = 5 * 60; |
| |
| private final ScheduledExecutorService inactivityTimer = |
| Executors.newSingleThreadScheduledExecutor(new DaemonThreadFactory()); |
| private final Activity activity; |
| private ScheduledFuture<?> inactivityFuture = null; |
| private final BroadcastReceiver powerStatusReceiver = new PowerStatusReceiver(); |
| |
| InactivityTimer(Activity activity) { |
| this.activity = activity; |
| onActivity(); |
| } |
| |
| void onActivity() { |
| cancel(); |
| if (!inactivityTimer.isShutdown()) { |
| try { |
| inactivityFuture = inactivityTimer.schedule(new FinishListener(activity), |
| INACTIVITY_DELAY_SECONDS, |
| TimeUnit.SECONDS); |
| } catch (RejectedExecutionException ree) { |
| // surprising, but could be normal if for some reason the implementation just doesn't |
| // think it can shcedule again. Since this time-out is non-essential, just forget it |
| } |
| } |
| } |
| |
| public void onPause() { |
| cancel(); |
| activity.unregisterReceiver(powerStatusReceiver); |
| } |
| |
| public void onResume(){ |
| activity.registerReceiver(powerStatusReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); |
| onActivity(); |
| } |
| |
| private void cancel() { |
| ScheduledFuture<?> future = inactivityFuture; |
| if (future != null) { |
| future.cancel(true); |
| inactivityFuture = null; |
| } |
| } |
| |
| void shutdown() { |
| cancel(); |
| inactivityTimer.shutdown(); |
| } |
| |
| private static final class DaemonThreadFactory implements ThreadFactory { |
| public Thread newThread(Runnable runnable) { |
| Thread thread = new Thread(runnable); |
| thread.setDaemon(true); |
| return thread; |
| } |
| } |
| |
| 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 |
| // In Android 2.0+, use BatteryManager.EXTRA_PLUGGED |
| int batteryPlugged = intent.getIntExtra("plugged", -1); |
| if (batteryPlugged > 0) { |
| InactivityTimer.this.cancel(); |
| } |
| } |
| } |
| } |
| |
| } |