UnRegister BroadcastReceiver Dynamically While Exiting App throws IllegalArgumentException

[Django_Untaken]

Hello there. I have this BroadcastReciever which I register and unregister dynamically, in a BASE activity. The purpose, of this receiver, is very simple. I check if HOME button is pressed? The registration of the receiver is as follows: ActivityBase

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mHomeWatcher = new HomeWatcher(this);
    mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
        @Override
        public void onHomePressed() {
          // my code goes here
        }
        @Override
        public void onHomeLongPressed() {
          // my code goes here
        }
    });
    mHomeWatcher.startWatch();

}

protected void stopHomeWatcher(){
    if(mHomeWatcher != null) {
        mHomeWatcher.stopWatch();
        mHomeWatcher.setOnHomePressedListener(null);
        mHomeWatcher = null;
    }
}

HomeWatcher

public class HomeWatcher {
public HomeWatcher(Context context) {
mContext = context;
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
}

public void setOnHomePressedListener(OnHomePressedListener listener) {
    mListener = listener;
    mReceiver = new InnerReceiver();
}

public void startWatch() {
    if (mReceiver != null) {
        mContext.registerReceiver(mReceiver, mFilter);
    }
}

/* EXCEPTION IN THIS FUNCTION */
public void stopWatch() {
if (mReceiver != null) {
if(mContext != null)
mContext.unregisterReceiver(mReceiver);// <<==========THIS IS WHERE I GET EXCEPTION
}
}

class InnerReceiver extends BroadcastReceiver {
    final String SYSTEM\_DIALOG\_REASON\_KEY = "reason";
    final String SYSTEM\_DIALOG\_REASON\_GLOBAL\_ACTIONS = "globalactions";
    final String SYSTEM\_DIALOG\_REASON\_RECENT\_APPS = "recentapps";
    final String SYSTEM\_DIALOG\_REASON\_HOME\_KEY = "homekey";

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(Intent.ACTION\_CLOSE\_SYSTEM\_DIALOGS)) {
            String reason = intent.getStringExtra(SYSTEM\_DIALOG\_REASON\_KEY);
            if (reason != null) {
                if(reason.trim().toLowerCase().equals("homekey")

[Richard Deeming]

Does the exception say that the receiver is not registered? At a guess, you're calling unregisterReceiver twice. I don't "do" Android dev, but I suspect you'd want something more like this:

public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
}

public void startWatch() {
if (mListener != null && mReceiver == null) {
mReceiver = new InnerReceiver();
mContext.registerReceiver(mReceiver, mFilter);
}
}

public void stopWatch() {
if (mReceiver != null) {
mContext.unregisterReceiver(mReceiver);
mReceiver = null;
}
}

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