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Avoid weird case where batter status listener is unregistered without being registered?

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git-svn-id: https://zxing.googlecode.com/svn/trunk@2894 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen@gmail.com 2013-09-13 12:09:01 +00:00
parent f84c8470a4
commit 23ed9a790c
1 changed files with 17 additions and 5 deletions
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22
android/src/com/google/zxing/client/android/InactivityTimer.java
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@ -36,11 +36,13 @@ final class InactivityTimer {
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();
}
@ -50,17 +52,27 @@ final class InactivityTimer {
inactivityTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
public void onPause() {
public synchronized void onPause() {
cancel();
activity.unregisterReceiver(powerStatusReceiver);
if (registered) {
activity.unregisterReceiver(powerStatusReceiver);
registered = false;
} else {
Log.w(TAG, "PowerStatusReceiver was never registered?");
}
}
public void onResume(){
activity.registerReceiver(powerStatusReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
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() {
private synchronized void cancel() {
AsyncTask<?,?,?> task = inactivityTask;
if (task != null) {
task.cancel(true);