LiveData,how to avoid the first callback when register observer
You could use SingleLiveEvent which won't be triggered as long as the content hasn't changed.
This is recommended by Google, though.
I found a simple solution,check the livedata value before load
@Override
public void onResume() {
super.onResume();
if (mainViewModel.increaseTaskList.getValue()==null) {
Log.d("ZZZ","IncreaseFragment loadTaskAsync");
mainViewModel.loadIncreasePointTaskList();
}
}