/*
* 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 android.os.AsyncTask;
import android.os.BatteryManager;
import android.util.Log;
import com.google.zxing.client.android.common.executor.AsyncTaskExecInterface;
import com.google.zxing.client.android.common.executor.AsyncTaskExecManager;
/**
* 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 AsyncTaskExecInterface taskExec;
private final BroadcastReceiver powerStatusReceiver;
private InactivityAsyncTask inactivityTask;
InactivityTimer(Activity activity) {
this.activity = activity;
taskExec = new AsyncTaskExecManager().build();
powerStatusReceiver = new PowerStatusReceiver();
onActivity();
}
synchronized void onActivity() {
cancel();
inactivityTask = new InactivityAsyncTask();
taskExec.execute(inactivityTask);
}
public void onPause() {
cancel();
activity.unregisterReceiver(powerStatusReceiver);
}
public void onResume(){
activity.registerReceiver(powerStatusReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
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;
}
}
}