Android Open Source - ivotingverification Inactivity Timer

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Back to project page ivotingverification.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 *// ww  w.  j a va 2 s  . co  m
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 *
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and  
 * permission notice:  
 * 
 * Copyright (C) 2008 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 ee.vvk.ivotingverification.qr;

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;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

/**
 * Finishes an activity after a period of inactivity if the device is on battery
 * power.
 */
public 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();

  public InactivityTimer(Activity activity) {
    this.activity = activity;
    onActivity();
  }

  public void onActivity() {
    cancel();
    if (!inactivityTimer.isShutdown()) {
      try {
        inactivityFuture = inactivityTimer.schedule(new FinishListener(
            activity), INACTIVITY_DELAY_SECONDS, TimeUnit.SECONDS);
      } catch (RejectedExecutionException ree) {
      }
    }
  }

  public void onPause() {
    cancel();
    try {
      activity.unregisterReceiver(powerStatusReceiver);
    } catch (Exception e) {
    }
  }

  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;
    }
  }

  public void shutdown() {
    cancel();
    inactivityTimer.shutdown();
  }

  private static final class DaemonThreadFactory implements ThreadFactory {
    @Override
    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())) {
        int batteryPlugged = intent.getIntExtra("plugged", -1);
        if (batteryPlugged > 0) {
          InactivityTimer.this.cancel();
        }
      }
    }
  }
}

Java Source Code List

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