Android Open Source - final_app Inactivity Timer

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The source code is released under:

CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors/*from w ww .  j a  v  a  2s  . c o  m*/
 *
 * 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 android.os.AsyncTask;
import android.os.BatteryManager;
import android.util.Log;

/**
 * Finishes an activity after a period of inactivity if the device is on battery power.
 */
final class InactivityTimer {

  private static final String TAG = InactivityTimer.class.getSimpleName();

  private static final long INACTIVITY_DELAY_MS = 5 * 60 * 1000L;

  private final Activity activity;
  private final BroadcastReceiver powerStatusReceiver;
  private boolean registered;
  private AsyncTask<?, ?, ?> inactivityTask;

  InactivityTimer(Activity activity) {
    this.activity = activity;
    powerStatusReceiver = new PowerStatusReceiver();
    registered = false;
    onActivity();
  }

  synchronized void onActivity() {
    cancel();
    inactivityTask = new InactivityAsyncTask();
    inactivityTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
  }

  public synchronized void onPause() {
    cancel();
    if (registered) {
      activity.unregisterReceiver(powerStatusReceiver);
      registered = false;
    } else {
      Log.w(TAG, "PowerStatusReceiver was never registered?");
    }
  }

  public synchronized void onResume() {
    if (registered) {
      Log.w(TAG, "PowerStatusReceiver was already registered?");
    } else {
      activity.registerReceiver(powerStatusReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
      registered = true;
    }
    onActivity();
  }

  private synchronized void cancel() {
    AsyncTask<?, ?, ?> task = inactivityTask;
    if (task != null) {
      task.cancel(true);
      inactivityTask = null;
    }
  }

  void shutdown() {
    cancel();
  }

  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
        boolean onBatteryNow = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) <= 0;
        if (onBatteryNow) {
          InactivityTimer.this.onActivity();
        } else {
          InactivityTimer.this.cancel();
        }
      }
    }
  }

  private final class InactivityAsyncTask extends AsyncTask<Object, Object, Object> {
    @Override
    protected Object doInBackground(Object... objects) {
      try {
        Thread.sleep(INACTIVITY_DELAY_MS);
        Log.i(TAG, "Finishing activity due to inactivity");
        activity.finish();
      } catch (InterruptedException e) {
        // continue without killing
      }
      return null;
    }
  }

}

Java Source Code List

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