java - Android ListView CHOICE_MODE_SINGLE 不会设置

Question

这是一个针对 Android 4.1+ 的应用。我希望 ListView 处于 Activity 状态。我正在其他应用程序中使用代码，这些代码可以正常工作。不确定这里有什么区别(除了 API 版本更高)。

我有这个Java:

    DrawerAdapter lAdapter = new DrawerAdapter(this, modeList);
    mDrawerList.setAdapter(lAdapter);
    mDrawerList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    mDrawerList.setItemChecked(0, true);

    mDrawerList.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> arg0, View v, int pos,
                long id) {

            mDrawerList.setItemChecked(pos, true);
           }

抽屉布局:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:id="@+id/main_frag"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ListView
        android:id="@+id/drawer_list"
        android:layout_width="250dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:cacheColorHint="#ececec"
        android:background="@drawable/tile_repeat"
        android:fadingEdge="none"
        android:listSelector="@drawable/nav_selector"
        android:scrollbars="none" />

</android.support.v4.widget.DrawerLayout>

选择器:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <!-- pressed -->
    <item android:drawable="@drawable/nav_press" android:state_activated="false" android:state_pressed="true"/>

    <!-- CHECKED -->
    <item android:drawable="@drawable/nav_active" android:state_activated="true" android:state_pressed="false" />

</selector>

nav_active:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="#cecece" />
</shape>

我是不是少了一步？ Press 状态工作正常，只是未激活。

DrawerAdapter 的 Root View row_drawer_layout.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tvMenuItem"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:textColor="#005348"/>

    </LinearLayout>

抽屉适配器:

public class DrawerAdapter extends ArrayAdapter<String> {
private final Context context;

public DrawerAdapter(Context context, String[] sizeList) {
    super(context, 0, sizeList);
    this.context = context;
}


static class ViewHolder {
    public TextView tv1;
    public TextView tv2;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    View rowView = convertView;

    if (rowView == null) {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        rowView = inflater.inflate(R.layout.row_drawer_layout, null, true);

        holder = new ViewHolder();
        holder.tv1 = (TextView) rowView.findViewById(R.id.tvMenuItem);
        rowView.setTag(holder);
    } else {
        holder = (ViewHolder) rowView.getTag();
    }

    String s = getItem(position);
    holder.tv1.setText(s);

    return rowView;

}

}

Answer 1

您的ListView项目的 Root View 应该实现Checkable接口(interface)。在您的情况下，LinearLayout 确实实现了Checkable。您应该在布局中使用 CheckedTextView。

它应该看起来像这样。

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/tvMenuItem"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="TextView"
        android:textColor="#005348"
        android:background="@drawable/checkable_item"/>

如果您想在项目中拥有更复杂的布局，您可以扩展 Android 布局之一并向其添加 Checkable 接口(interface)。 Here是 `RelativeLayout`` 的一个例子

要更改选中项目的背景，您应该在选择器中使用选中状态:

checkable_item.xml
<selector>
    ...
    <item android:state_checked="true" android:drawable="@drawable/some_drawable" />
    ...
</selector>