Question

我有一个列表视图，当我长按列表时，我想显示一个菜单（上下文操作模式）。当我第一次点击时它不起作用，但其他时候它起作用。我注意到onItemLongClick总是被调用，但是Contextual Action Mode只是第二次启动。这是我的代码：

 public void onActivityCreated(Bundle savedInstanceState)
 {
    super.onActivityCreated(savedInstanceState);

    stringList = new LinkedList<>();
    stringList.add("A");
    stringList.add("B");
    stringList.add("C");
    stringList.add("D");
    stringList.add("E");
    listView = getListView();
    arrayAdapter = new ArrayAdapter<String>(getActivity(),R.layout.support_simple_spinner_dropdown_item,stringList);
    listView.setAdapter(arrayAdapter);

    final AbsListView.MultiChoiceModeListener choiceModeListener = new AbsListView.MultiChoiceModeListener()
    {
        @Override
        public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked)
        {
            Toast.makeText(getActivity(),position+"",Toast.LENGTH_SHORT).show();
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu)
        {
            MenuInflater menuInflater = mode.getMenuInflater();
            menuInflater.inflate(R.menu.contentmenu2,menu);
            return true;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            return false;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {

        }
    };

    listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener()
    {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id)
        {
            listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
            listView.setMultiChoiceModeListener(choiceModeListener);
            Toast.makeText(getActivity(),"LONG CLICK",Toast.LENGTH_SHORT).show();
            return true;
        }
    });

}

Answer 1

我绕过了这部分代码的问题：

    listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
    listView.setMultiChoiceModeListener(choiceModeListener);

    listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener()
    {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id)
        {
            listView.setMultiChoiceModeListener(choiceModeListener);
            return true;
        }
    });

通过这种方式启动上下文菜单，因为我调用它两次，但我不明白为什么我要调用它两次......

Android：不立即调用setMultiChoiceModeListener（上下文操作模式）

1 个答案: