Question

我在Fragment中有一个列表视图，您可以在其中检查项目，以及一个显示单击项目的按钮。但是当我取消选中项目并按下按钮时，它仍然显示为已选中。什么可以解决问题？

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout.feat, container, false);
     final ListView list=(ListView)view.findViewById(R.id.listView1);
    final Button button=(Button)view.findViewById(R.id.button1);
    list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    list.setItemChecked(4, true);

    ArrayAdapter<String> adapter=new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_multiple_choice,items);
    list.setAdapter(adapter);
    SparseBooleanArray checked = list.getCheckedItemPositions();

    button.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View arg0) {
            switch (arg0.getId()) {
                case R.id.button1:
                    SparseBooleanArray a = list.getCheckedItemPositions();
                    if (checked(a) > 0) {
                        String vCheckedList = "";
                        for (int i = 0; i < list.getAdapter().getCount(); i++) {
                            if (a.valueAt(i) && i < list.getAdapter().getCount() && a.size() > 1)
                                vCheckedList += list.getAdapter().getItem(a.keyAt(i)) + "\n";
                            else if (a.valueAt(i))
                                vCheckedList += list.getAdapter().getItem(a.keyAt(i));
                        }
                        Toast.makeText(getActivity().getApplicationContext(), vCheckedList + " is checked", Toast.LENGTH_SHORT).show();
                        a.clear();
                    } else
                        Toast.makeText(getActivity().getApplicationContext(), "No Item is Selected", Toast.LENGTH_SHORT).show();
                    break;
                default:
                    break;
            }
        }
    });

    return view;
}

这是xml：`

<!-- TODO: Update blank fragment layout -->
<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="382dp">
</ListView>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Search"
    android:id="@+id/button1"
    android:layout_gravity="center_horizontal|bottom" />

`

Answer 1

在xml文件中设置CheckBox

android:clickable="true"
android:focusable="false"

Answer 2

删除onClick（）中的a.clear();方法然后它将起作用。

ListView中的OnClick按钮无法正常工作

2 个答案: