SagiLow SagiLow - 1 year ago 59
Android Question

Why onReceive is not called extending BroadcastReceiver in Android

the onReceive method isn't called for some reason

I've not applied any filters or anything,

Here is the class :

import java.util.ArrayList;
import java.util.Calendar;

import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.util.Log;

public class RegisterListener extends BroadcastReceiver {
private final int DELAY_TIME = 5;
private int m_seconds = 0;
private int m_minutes = 0;
private int m_hours = 0;
static ArrayList<BroadcastReceiverListener> listeners = new ArrayList<BroadcastReceiverListener>();

@Override
public void onReceive(Context context, Intent intent) {

Log.d("ScreenReceiver Action:",intent.getAction());

Calendar c = Calendar.getInstance();
m_seconds = c.get(Calendar.SECOND);
m_minutes = c.get(Calendar.MINUTE);
m_hours = c.get(Calendar.HOUR);

for (BroadcastReceiverListener listener:listeners){
listener.onReceive(m_hours, m_minutes, m_seconds);
}
}


public static void addBroadcastReceiveListener (BroadcastReceiverListener listener){
if(!listeners.contains(listener)){
listeners.add(listener);
}
}

public void removeBroadcastReceiveListener (BroadcastReceiverListener listener){
if(listeners.contains(listener)){
listeners.remove(listener);
}
}


Here is the declaration in the manifest (child of Application)

<receiver android:name=".RegisterListener"></receiver>


Edit :
This is the filter i tried to add (inside the onReceive() )

IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
BroadcastReceiver mReceiver = new RegisterListener();
registerReceiver(mReceiver, filter);


I get an error :

The method registerReceiver(BroadcastReceiver, IntentFilter) is undefined for the type RegisterListener

Sam Sam
Answer Source

If you always want to listen for ACTION_USER_PRESENT, try:

<receiver android:name=".RegisterListener">
    <intent-filter>
        <action android:name="android.intent.action.USER_PRESENT" />
    </intent-filter>
</receiver>

Explanations

The method registerReceiver(BroadcastReceiver, IntentFilter) is undefined for the type RegisterListener

You must use registerReceiver() with a Context, for example context.registerReceiver(...). But:

This is the filter i tried to add (inside the onReceive() )

It doesn't make sense to register a receiver inside onReceive() because onReceive() will not run until you have registered a receiver... So it will never happen. You can put this code in onCreate() in your Activity, like this:

IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
BroadcastReceiver mReceiver = new RegisterListener();
registerReceiver(mReceiver, filter);

This will only listen for ACTION_USER_PRESENT while your app is already running.