Question

我在ListView上实现了CAB和MultiChoiceModeListener，除了在选择时更改列表项的背景颜色（多选）时，一切都很完美。这是我的代码：

listView.xml：

<ListView 
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="#ebebeb"
    android:dividerHeight="1dip"
    android:listSelector="@drawable/list_selector"/>

list_selector：

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="@android:color/holo_green_light"/>
<item android:state_pressed="true" android:drawable="@android:color/holo_blue_light"/>
<item android:state_focused="true" android:drawable="@android:color/holo_blue_dark"/>
<item android:drawable="@android:color/white"/>
</selector>

片段：

l.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
l.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
        @Override
        public void onItemCheckedStateChanged(android.view.ActionMode mode, int position, long id, boolean checked) {
            int checkedCount = l.getCheckedItemCount();
            mode.setTitle(checkedCount + " Selected");
        }

        @Override
        public boolean onCreateActionMode(android.view.ActionMode mode, Menu menu) {
            return true;
        }

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

        @Override
        public boolean onActionItemClicked(android.view.ActionMode mode, MenuItem item) {
        }

        @Override
        public void onDestroyActionMode(android.view.ActionMode mode) {
        }
    });

Answer 1

我所做的是保存有关项目的数据，看它是否被选中，然后只需调用适配器的xcdatamodel再次创建视图。在我的情况下，它是关于更改项目列表中的图标。

这是相关的notifyDataSetChanged部分：

MultiChoiceModeListener

这就是我在适配器中所做的：

mylist.setMultiChoiceModeListener(new MultiChoiceModeListener()
    {

        private int numberOfSelected = 0;

        @Override
        public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked)
        {
            // Here you can do something when items are
            // selected/de-selected,
            // such as update the title in the CAB
            if (checked)
            {
                numberOfSelected++;
            } else
            {
                numberOfSelected--;
            }
            mode.setTitle(numberOfSelected + " items selected");
            itemsData.get(position).isChecked = checked; //a collection of data item's status
            m_listAdapter.notifyDataSetChanged();
        }
        ...

所以我只是在选择一个项目后再次构建列表项。

Android ListItem选择器不适用于MultiChoiceModeListener

1 个答案: