添加新項目時更新自定義ArrayAdapter <Memory>以更新

Question

好吧，讓我有一個充滿ListFragment的MemoryListActivity。我填充列表與自定義的內存對象，並使用下面

public class MemoryAdapter extends ArrayAdapter<Memory> { 

private static final String TAG = "MemoryAdapter.TAG"; 
private Context context; 
private List<Memory> objects; 

public MemoryAdapter(Context context, int resource, List<Memory> memoryList) { 
    super(context,resource, memoryList); 
    this.context = context; 
    this.objects = memoryList; 


} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    Log.i(TAG, "getView entered"); 

    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 

    View view = inflater.inflate(R.layout.memory_list_item, null); 

    Memory memory = objects.get(position); 

    TextView eventTV = (TextView) view.findViewById(R.id.list_item_title); 
    eventTV.setText(memory.getEventName()); 

    TextView eventLocationTV = (TextView) view.findViewById(R.id.list_item_location); 
    eventLocationTV.setText(memory.getEventLocation()); 

    TextView numGuestsTV = (TextView) view.findViewById(R.id.list_item_guest_count); 
    numGuestsTV.setText(Integer.toString(memory.getNumGuests())); 

    return view; 
} 
} 

的MemoryAdapter.class我試圖從onActivityResult方法被稱爲更新它，當我回來，如果結果代碼是好的。

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    if (requestCode == NEW_MEM_CODE && resultCode == RESULT_OK) { 
     // TODO: force refresh with notifyDataSetChanged() 
     refresh(); 
    } 
} 

在這個refresh();方法中需要什麼代碼？這是我試過，但它不工作

private void refresh() { 

    MemoryListFragment frag = (MemoryListFragment) getFragmentManager().findFragmentByTag(MemoryListFragment.TAG); 

    ArrayAdapter<Memory> adapter = (ArrayAdapter<Memory>) frag.getListAdapter(); 

    adapter.notifyDataSetChanged(); 
} 

Answer 1

這樣做：

private void refresh() { 

    memoryAdapter=MemoryAdapter(context, updatedMemoryList); 

    memoryAdapter.notifyDataSetChanged(); 
}