Updating adapter after SQLIte update

Question

This is my app architecture so far:

I have a MainActivity which has a Fragment which has an Adapter:

Activity > Fragment > Adapter

I update my SQLiteDb from my Activity, I would like to know how I can call the method:

adapter.notifySetDataChange();

from there (or from my DatabaseHandler Class) DatabaseHandler is just a class that I can create anywhere and retrieve my SQLiteDB.

I guess this might be a suitable use case for the observer pattern, but I'm not quite sure how I can go about it.

Answer 1

我建议使用游标加载器模式，该模式将自动更新适配器： http : //developer.android.com/training/load-data-background/setup-loader.html

Answer 2

You can expose a public method (eg updateMyAdapter() ) in your fragment that updates your adapter and call it from your activity. You can get the fragment from your activity using

YourFragment f = (YourFragment)getFragmentManager().findFragmentById(...);
if(f != null)
    f.updateMyAdapter();