MyHandler.java

static class MyHandler extends Handler {
    private final WeakReference<MyActivity> mRef;

    MyHandler(MyActivity activity) {
        mRef = new WeakReference<HomeActivity>(activity);
    }

    @Override
    public void handleMessage(Message msg) {
        MyActivity activity = mRef.get();
        if (activity != null) {
        
        }
    }
}