Date and time change listener in Android?

Question

In my application, there's a alarm service, and I find that if user change it's date or time to a passed time. My alarm will not be triggered at the time I expect.

So, I may have to reset all the alarms again. Is there an date and time change listener in android?

Answer 1

Create an intent filter :

static {
    s_intentFilter = new IntentFilter();
    s_intentFilter.addAction(Intent.ACTION_TIME_TICK);
    s_intentFilter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
    s_intentFilter.addAction(Intent.ACTION_TIME_CHANGED);
}

and a broadcast receiver:

private final BroadcastReceiver m_timeChangedReceiver = new BroadcastReceiver() {                                                                                             
    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();

        if (action.equals(Intent.ACTION_TIME_CHANGED) ||
                    action.equals(Intent.ACTION_TIMEZONE_CHANGED)) {
            doWorkSon();
        }
    }
};

register the receiver:

public void onCreate() {
    super.onCreate();
    registerReceiver(m_timeChangedReceiver, s_intentFilter);     
}

EDIT:

and unregister it:

public void onDestroy() {
    super.onDestroy();
    unregisterReceiver(m_timeChangedReceiver);     
}

Answer 2

In addition to the accepted answer

If you want to listen to time changes while your app is not running I would register in the manifest:

<receiver android:name="com.your.pacakge.TimeChangeBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.TIME_SET"/>
        <action android:name="android.intent.action.TIMEZONE_CHANGED"/>
    </intent-filter>
</receiver>

If you do this, do not explicitly register the receiver in the code with registerReceiver and unregisterReceiver.

Again, this is just an addition to the accepted answer.