Android 如何刷新当前activity的显示数据？

Question

如何我在一个界面上有两个listview，当触发某项操作，使数据库数据发生变化，两个listview里面的数据都需要更新一下，应该如何刷新呢？

Answer 1

Adapter has notifyDataSetChanged() method

Answer 2

Add a listener. The implementation of the function is to execute notifyDataSetChanged of two listview adapters
Write a function to monitor database changes. When receiving database changes, execute the listener interface function

Answer 3

After you add the list to the adapter, ListView set adapter, when the data source list changes, calling the adapter's notifyDataChange method should refresh it~

Answer 4

Use eventbus to distribute events, and then call the adapter’s notifyDataSetChanged() method

Answer 5

If I understand "a certain operation causes data changes" correctly, you can use the observer mode to handle it, because one operation triggers another operation, and it is relatively simple and worry-free.

First register data monitoring:

 getContentResolver().registerContentObserver(Uri uri, boolean notifyForDescendents, ContentObserver observer) ;

ContentObserver accepts callbacks after changes occur. You can put the code to update the ListView here:

 private ContentObserver mObserver = new ContentObserver(new Handler()) {
        @Override
        public void onChange(boolean selfChange) {
             // 重新查询数据
             
             ...
             
             // 更新ListView1
             listView1.notifyDataSetChanged();
             // 更新ListView2
             listView2.notifyDataSetChanged();
        }
    }

Notify ListView to update data:

getContentResolver().notifyChange(Uri uri, null, false);

The above is just an explanation of the idea. The actual implementation is up to you. You can also refer to my project

PS: Thanks @dabaooline for the reminder