Running code in main thread from another thread

Question

In an android service I have created thread(s) for doing some background task.

I have a situation where a thread needs to post certain task on main thread\'s message

Answer 1

If you run code in a thread, e.g. do delaying some action, then you need to invoke runOnUiThread from the context. For example, if your code is inside MainActivity class then use this:

MainActivity.this.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        myAction();
    }
});

If your method can be invoked either from main (UI thread) or from other threads you need a check like:

public void myMethod() {
   if( Looper.myLooper() == Looper.getMainLooper() ) {
       myAction();
   }
   else {

}