Question

我正在动态更改listviewAdapter行选定项。在适配器中，默认情况下selectedItem为-1。

public static int selectedItem = -1; // no item selected by default

和方法highlightItem在适配器getview方法中调用。

public View getView(final int position, View convertView, ViewGroup parent) {
        View vi = convertView;
        if (convertView == null) {
            vi = inflater.inflate(R.layout.catalogue_row, null);
            holder = new ViewHolder();

highlightItem(selectedItem,position,vi);

这是我的highlightItem方法。

private static void highlightItem(int selectedItem,int position, View result) {

    System.out.println("selected item "+selectedItem);
    if(position == selectedItem) {

        // you can define your own color of selected item here
        ViewHolder.lyCatalogueRow.setBackgroundColor(Color.parseColor(SharePreferenceController.getListViwHightlightColor()));

    } else {

        // you can define your own default selector here
        ViewHolder.lyCatalogueRow.setBackgroundColor(Color.parseColor(SharePreferenceController.getListViwBackgroundColor()));

    }
}

当我点击listview项目

时

private OnItemClickListener itemlistener = new OnItemClickListener(){

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
    // TODO Auto-generated method stub

    int item_position = position -1;

    System.out.println("selectedItemposition "+item_position);

    CatalogueEfficientAdapter.selectedItem=item_position;

    catalogueEfficientAdapter.notifyDataSetChanged();


}

};

我的arraylist包含三个项目。当我点击第三个项目时，它会被突出显示。现在，如果我单击第二个元素，则只应突出显示第二个元素，但第三个元素正在高亮显示。如何仅选择和高亮显示所选项目

更新问题是没有更新的highlightItem。

Answer 1

public View getView(final int position, View convertView, ViewGroup parent) {
        View vi = convertView;
        if (convertView == null) {
            vi = inflater.inflate(R.layout.catalogue_row, null);

    if(position == selectedItem) {

        // you can define your own color of selected item here
        vi.setBackgroundColor(Color.parseColor(SharePreferenceController.getListViwHightlightColor()));

    } else {

        // you can define your own default selector here
        vi.setBackgroundColor(Color.parseColor(SharePreferenceController.getListViwBackgroundColor()));

    }

Answer 2

如果您想手动和以编程方式选择项目，可以尝试从ViewHolder中丢弃。
确定getView方法中的每个元素！

Answer 3

public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
    // Dont decrement the position
    int item_position = position;

    System.out.println("selectedItemposition "+item_position);

    CatalogueEfficientAdapter.selectedItem=item_position;

    catalogueEfficientAdapter.notifyDataSetChanged();   
}

Answer 4

// try this way hope this will help you...

1.define your "ListView" item selector color in colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="list_item_selected_bg">#FF0000</color>
</resources>

2.define drawable selector for "ListView" item
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- Selected -->
    <item
        android:state_focused="true"
        android:state_selected="false"
        android:drawable="@color/list_item_selected_bg"/>

    <!-- Pressed -->
    <item
        android:state_selected="true"
        android:state_focused="false"
        android:drawable="@color/list_item_selected_bg" />

</selector>

3.use this selector for "ListView" item selection
yourListView.setSelector(R.drawable.list_item_selector);

Listview适配器选择行背景android

4 个答案: