android - ListView 数据已删除并已更新，notifyDataSetChanged 被调用，但我的列表没有更新

Question

我有一个带有自定义适配器的ListView，它是从本地sqlite 数据库填充的。当用户长按该项目并选择“删除”时，将弹出对话框再次确认操作，确认点击后该项目将被删除。 我的问题是该项目已从数据库中删除，并且 arraylist(适配器的数据集)已更新，但即使我已经调用了 notificationDataSetChanged()，ListView 也没有更新。
//删除方法设置在AlertDialog/PositiveButton点击监听器

我已经检查或尝试了以下操作，但仍然......
1.重建它(继续创建)， ListView 将正确显示，所以应该不是其他问题。
2.我调用了相同的适配器，已通过相同的 hashCode 确认
3. mListView.setAdapter((ListViewAdapter)(ListViewer.mListView.getAdapter()));
4. allResArray.clear();加载数据()；

有人可以帮我吗？谢谢。我已经坚持了两天了!!

这是我的代码:

private static ListView mListView;                  
private ListViewAdapter mListViewAdapter;
public String[] strListRID;
public List<List<String>> allResArray;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);    
    setView(R.layout.listviewer);
    init(); 
}

public void init(){
    setTitle(getString(R.string.app_name));
    setTitleBar(R.drawable.title_home, 0, R.drawable.title_add, 0, 
            0, 0, R.drawable.titlebar_title, 0);
    initListView();     
}

//MainListView initialization    
private void initListView(){
    boolean SD_STATE = checkSDState();
    allResArray = new ArrayList<List<String>>();
    loadData();

    mListView = (ListView) findViewById(R.id.ListView);
    mListViewAdapter = new ListViewAdapter(this, SD_STATE, allResArray);
    mListView.setAdapter(mListViewAdapter);
    Log.i("mListViewAdapter", String.valueOf(mListViewAdapter.hashCode()));

    mListView.setCacheColorHint(0x00000000);    

    // Click listener to ListView
    mListView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            goIntent(5, strListRID[position]);
        }   
    });   

    // ContextMenu listener to ListView
    mListView.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {       
        @Override
        public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) {
            menu.setHeaderTitle(R.string.conext_menu_title);       
            menu.add(0, 0, 0, R.string.conext_menu_edit);
            menu.add(0, 1, 0, R.string.conext_menu_delete);
        }       
    });  
}

@Override  
public boolean onContextItemSelected(MenuItem item){
    AdapterView.AdapterContextMenuInfo menuInfo = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    switch (item.getItemId()) {
    case 0:         //Edit
        goIntent(5, strListRID[menuInfo.position]);
        return true;    
    case 1:         //Delete
        showDeleteDialog(strListRID[menuInfo.position], menuInfo.position);
        break;                  
    default:
        break;        
    }
    return super.onContextItemSelected(item); 
}

private void loadData() {
    allResArray = getAllDatabaseRes();
    int size = allResArray.get(0).size();
    strListRID = allResArray.get(0).toArray(new String[size]);
}

/**
 * AlertDialog: confirm before delete data
 * Remove it from ArrayList and notifyDataSetChanged() to adapter
 * @param strListRID
 */
private void showDeleteDialog(final String strListRID, final int position) {
    AlertDialog.Builder dialog = new AlertDialog.Builder(this);
    dialog.setIcon(R.drawable.dialog_notice);
    dialog.setMessage(R.string.text_delete);        
    dialog.setPositiveButton(R.string.btn_delete, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            if (delRes(Integer.parseInt(strListRID))){
                                    int size =((ListViewAdapter)(mListView.getAdapter())).mResArray.size();
                for (int i = 0; i < size; i++){
                    ((ListViewAdapter)(mListView.getAdapter())).mResArray.get(i).remove(position);
                }
                ((ListViewAdapter)(ListViewer.mListView.getAdapter())).notifyDataSetChanged();
                Log.i("mListViewAdapter_check", String.valueOf(((ListViewAdapter)(ListViewer.mListView.getAdapter())).hashCode()));
                showShortToast((String) getResources().getText(R.string.text_record_delete_ok));
            }
            else{
                showShortToast((String) getResources().getText(R.string.text_record_delete_ng));
            }   
        }
    });
    dialog.setNegativeButton(R.string.text_no, null);   
    dialog.show();      
}

BaseActivity中的delRes()代码:

 /**
 * Delete the specific rid record from database
 * @return boolean DEL_OK
 * @throws SQLException
 */
protected boolean delRes(int strRID) throws SQLException {    
    boolean DEL_OK = false;
    String deleteWhere = "rid=?";
    String[] deleteWhereValue = { String.valueOf(strRID)};
    Log.i("rid to delete", deleteWhereValue[0]);

    int delrow = dbHelper.delete(tables[0], deleteWhere, deleteWhereValue);
    Log.i("delrow", String.valueOf(delrow));

    if (delrow == 1){
        DEL_OK = true;
    }
    return DEL_OK;
}

还有 logCat:

02-09 15:19:59.744: I/mListViewAdapter(28235): 1163110296
02-09 15:19:59.784: I/tmp(28235): /sdcard/Photo/20120208164204.jpg
02-09 15:19:59.814: I/tmp(28235): /sdcard/Photo/20120208163627.jpg
02-09 15:19:59.854: I/tmp(28235): /sdcard/Photo/20120209151917.jpg
02-09 15:20:05.514: I/menuInfo.position(28235): 1
02-09 15:20:08.634: I/rid to delete(28235): 10
02-09 15:20:08.674: I/delrow(28235): 1
02-09 15:20:08.674: I/mListViewAdapter_check(28235): 1163110296

当前解决方案:设置新的listviewadapter

    /**
 * AlertDialog: confirm before delete data
 * Remove it from ArrayList and notifyDataSetChanged() to adapter
 * @param strListRID
 */
private void showDeleteDialog(final String mRID, final int position) {
    AlertDialog.Builder dialog = new AlertDialog.Builder(this);
    dialog.setIcon(R.drawable.dialog_notice);
    dialog.setMessage(R.string.text_delete);        
    dialog.setPositiveButton(R.string.btn_delete, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {

            if (delRes(Integer.parseInt(mRID))){    
                int size = allResArray.size();
                for (int i = 0; i < size; i++){
                    allResArray.get(i).remove(position);
                }
                strListRID = allResArray.get(0).toArray(new String[size-1]);

                //((ListViewAdapter)(mListView.getAdapter())).notifyDataSetChanged();
                mListView.setAdapter(new ListViewAdapter(getApplicationContext(), true, allResArray));
                showShortToast((String) getResources().getText(R.string.text_record_delete_ok));
            }
            else{
                showShortToast((String) getResources().getText(R.string.text_record_delete_ng));
            }   
        }
    });
    dialog.setNegativeButton(R.string.text_no, null);   
    dialog.show();      
}

Answer 1

尝试直接从适配器删除指定的行，然后调用notifyDataSetChanged()。或者，您可以创建新适配器，迭代 ArrayList 并将数据添加到新适配器，然后将此适配器设置为 ListView。