长按和鲍勃菜单[关闭]

Posted 2023-04-18

【中文标题】长按和鲍勃菜单[关闭]

【英文标题】：long click and bob menu [closed]

【发布时间】：2012-11-24 22:32:44

【问题描述】：

我不知道如何处理这段代码中的删除和编辑

@Override  
public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) 
    super.onCreateContextMenu(menu, v, menuInfo);  
    menu.setHeaderTitle("Select");  
    menu.add(0, R.id.editt, 0, "Edit");  
    menu.add(0, R.id.delete, 0, "Delete");  
    menu.add(0, R.id.DeleteAll, 0, "delete all");
  

public boolean onContextItemSelected(MenuItem item) 
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
    switch(item.getItemId())
    
    case R.id.editt: 
        Intent ed  = new Intent(DsTest2Activity.this, Edit.class);
        startActivity(ed);
        break; 

    case R.id.delete: 

        break; 

    case R.id.DeleteAll: 
        SQLiteDatabase ld = openOrCreateDatabase(dbName, Context.MODE_PRIVATE, null);
        ld.delete(tableName, null, null);
        String[] from = "task", "_id";
        int[] to = R.id.textview_id,R.id.checkbox_id;

        SimpleAdapter sa = new SimpleAdapter(this, lc, R.layout.checkbox, from, to);
        ListView li = (ListView) findViewById(R.id.listview_id);
        li.setAdapter(sa);
        sa.notifyDataSetChanged();
        li.setVisibility(ListView.INVISIBLE);
        break; 

    default:  return true; 

    

    return super.onContextItemSelected(item);

当用户长按时

li.setOnItemLongClickListener(new OnItemLongClickListener() 
    public boolean onItemLongClick(AdapterView<?> adapter, View view, int position, long id)
       
        registerForContextMenu(li);
        return false;
    
);

【参考方案1】：

您必须在活动的onCreate() 方法中调用registerForContextMenu(li)，如果使用片段，则必须在onActivityCreated() 方法中调用。

您不必拨打li.setOnItemLongClickListener(...)。请删除它。

另请参阅以下讨论： How do you implement context menu in a ListActivity on android? 和 Context menu in list activity