Listener interface example:
public interface Listener {
public void notifyMe(Object someParam);
}
Listener example (e.g. your Activity that will implement Listener):
...
protected void onResume() {
...
backgroundThread.registerListener(this);
}
protected void onPause() {
...
backgroundThread.unRegisterListener(this);
}
public void notifyMe(Object someParam) {
// do something, like putting data from someParam into the UI.
...
}
Your background thread implements these:
...
Listener listener;
...
public void registerListener(Listener listener) {
this.listener = listener; // could be added to a list of Listeners as well, if necessary, for broadcasting.
}
public void unRegisterListener(Listener listener) {
if (this.listener == listener)
this.listener = null; // could be removed from a list of Listeners as well, if necessary, for removing from broadcasting.
}
......
// Somewhere in your background thread's code, where you need to update the UI.
if (this.listener != null) {
// Be sure that this code here is running on the UI thread!
this.listener.notifyMe(someData);
}
...
...
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