package com.zxing.utils;
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import android.annotation.SuppressLint;
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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 android.os.Build;
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import android.util.Log;
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/**
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* Finishes an activity after a period of inactivity if the device is on battery
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* power.
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*/
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public class InactivityTimer {
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private static final String TAG = InactivityTimer.class.getSimpleName();
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private static final long INACTIVITY_DELAY_MS = 5 * 60 * 1000L;
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private Activity activity;
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private BroadcastReceiver powerStatusReceiver;
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private boolean registered;
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private AsyncTask<Object, Object, Object> inactivityTask;
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public InactivityTimer(Activity activity) {
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this.activity = activity;
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powerStatusReceiver = new PowerStatusReceiver();
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registered = false;
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onActivity();
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}
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@SuppressLint("NewApi")
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public synchronized void onActivity() {
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cancel();
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inactivityTask = new InactivityAsyncTask();
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if (Build.VERSION.SDK_INT >= 11) {
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inactivityTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
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} else {
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inactivityTask.execute();
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}
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}
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public synchronized 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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Log.w(TAG, "PowerStatusReceiver was never registered?");
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}
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}
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public synchronized void onResume() {
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if (registered) {
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Log.w(TAG, "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 synchronized 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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public void shutdown() {
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cancel();
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}
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private class PowerStatusReceiver extends BroadcastReceiver {
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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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boolean onBatteryNow = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) <= 0;
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if (onBatteryNow) {
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InactivityTimer.this.onActivity();
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} else {
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InactivityTimer.this.cancel();
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}
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}
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}
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}
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private class InactivityAsyncTask extends AsyncTask<Object, Object, Object> {
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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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Log.i(TAG, "Finishing activity due to inactivity");
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activity.finish();
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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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}
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