144 lines
4.5 KiB
Java
144 lines
4.5 KiB
Java
package com.king.zxing;
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/*
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* Copyright (C) 2010 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import android.app.Activity;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.os.AsyncTask;
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import android.os.BatteryManager;
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import com.king.zxing.util.LogUtils;
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import java.lang.ref.WeakReference;
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import java.util.concurrent.RejectedExecutionException;
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/**
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* Finishes an activity after a period of inactivity if the device is on battery power.
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*/
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final class InactivityTimer {
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private static final long INACTIVITY_DELAY_MS = 5 * 60 * 1000L;
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private final Activity activity;
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private final BroadcastReceiver powerStatusReceiver;
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private boolean registered;
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private AsyncTask<Object,Object,Object> inactivityTask;
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InactivityTimer(Activity activity) {
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this.activity = activity;
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powerStatusReceiver = new PowerStatusReceiver(this);
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registered = false;
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onActivity();
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}
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void onActivity() {
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cancel();
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inactivityTask = new InactivityAsyncTask(activity);
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try {
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inactivityTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
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} catch (RejectedExecutionException ree) {
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LogUtils.w( "Couldn't schedule inactivity task; ignoring");
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}
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}
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void onPause() {
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cancel();
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if (registered) {
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activity.unregisterReceiver(powerStatusReceiver);
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registered = false;
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} else {
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LogUtils.w( "PowerStatusReceiver was never registered?");
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}
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}
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void onResume() {
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if (registered) {
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LogUtils.w( "PowerStatusReceiver was already registered?");
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} else {
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activity.registerReceiver(powerStatusReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
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registered = true;
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}
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onActivity();
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}
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private void cancel() {
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AsyncTask<?,?,?> task = inactivityTask;
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if (task != null) {
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task.cancel(true);
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inactivityTask = null;
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}
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}
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void shutdown() {
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cancel();
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}
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private static class PowerStatusReceiver extends BroadcastReceiver {
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private WeakReference<InactivityTimer> weakReference;
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public PowerStatusReceiver(InactivityTimer inactivityTimer){
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weakReference = new WeakReference<>(inactivityTimer);
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}
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@Override
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public void onReceive(Context context, Intent intent) {
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if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())) {
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// 0 indicates that we're on battery
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InactivityTimer inactivityTimer = weakReference.get();
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if(inactivityTimer!=null){
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boolean onBatteryNow = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) <= 0;
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if (onBatteryNow) {
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inactivityTimer.onActivity();
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} else {
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inactivityTimer.cancel();
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}
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}
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}
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}
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}
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private static class InactivityAsyncTask extends AsyncTask<Object,Object,Object> {
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private WeakReference<Activity> weakReference;
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public InactivityAsyncTask(Activity activity){
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weakReference = new WeakReference<>(activity);
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}
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@Override
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protected Object doInBackground(Object... objects) {
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try {
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Thread.sleep(INACTIVITY_DELAY_MS);
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LogUtils.i( "Finishing activity due to inactivity");
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Activity activity = weakReference.get();
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if(activity!=null){
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activity.finish();
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}
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} catch (InterruptedException e) {
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// continue without killing
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}
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return null;
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}
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}
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} |