[教学] Android GridView backpressed maintain scroll position, not back on top

Maintain/Save/Restore scroll position when returning to a GridView Android
Maintain Scroll Position of Android  GridView through Screen Rotation
Scroll position jumps on Android GridView
记录和恢复滚动位置-Android   GridView

1. static int index;
   
2. private GridView gridView;
   
3. 
   
4. @Override
   
5. public void onResume(){
   
6. 
   
7.     gridView.setSelection(index);
   
8.     super.onResume();
   
9. }
   
10. 
    
11. @Override
    
12. public void onPause(){  
    
13.     index = gridView.getFirstVisiblePosition();
    
14.     super.onPause();
    
15. }
    
16. 
    
17. @Override
    
18. public View onCreateView(LayoutInflater inflater, ViewGroup container,
    
19.                 Bundle savedInstanceState) {
    
20.     View view = inflater.inflate(R.layout.fragment_home, container, false);
    
21.                
    
22.    
    
23.     gridView= (GridView) view.findViewById(R.id.gridview);
    
24. 
    
25.        
    
26.     gridView.setOnItemClickListener(new OnItemClickListener() {
    
27.                 @Override
    
28.                 public void onItemClick(AdapterView<?> parent, View view,
    
29.                                 int position, long id) {
    
30.                         index = gridView.getFirstVisiblePosition();
    
31.                         Intent myIntent = new Intent(getActivity(), NewsList_Activity.class);
    
32.                         myIntent.putExtra("oStateItem", oStateItems.get(position));
    
33.                         startActivity(myIntent);
    
34.                 }
    
35.     })
    
36. 
    
37.     return view;
    
38. }
    
39. 
    

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