android - 将 ListView 项设置为选中

Question

我有一个主从 ListView 设置，我想更改主 fragment 中所选项目的背景。

我曾经有以下代码，但这不允许我使用成熟的选择器:

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);

        // Highlight selected item
        if (position == selectedPos) {
            view.setBackgroundColor((view.getResources()
            .getColor(R.color.nw_white)));
        } else {
            view.setBackgroundColor((view.getResources()
            .getColor(R.color.nw_grey)));
        }
        return view;
    }

它工作正常，但我想使用选择器。 (因为我希望这些项目在焦点和点击时适本地改变背景。)

所以我改成了:

            @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);

        // Highlight selected item
        if (position == selectedPos) {
            view.setSelected(true);
            // view.setBackgroundColor((view.getResources()
            // .getColor(R.color.nw_row_download_master_selected)));
        } else {
            view.setSelected(false);
            // view.setBackgroundColor((view.getResources()
            // .getColor(R.color.nw_row_download_master_normal)));
        }
        Log.d(TAG, "pos " + position + " is selected: "
            + view.isSelected());

        return view;
    }

列表行如下所示:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/selector_row_collection_master"
    android:orientation="horizontal"
    >

   ...
</LinearLayout>

选择器是这样的:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/row_master_detail_pressed"
          android:state_pressed="true" />
    <item android:drawable="@drawable/row_master_detail_focused"
          android:state_focused="true" />
    <item android:drawable="@color/nw_row_master_master_selected"
          android:state_selected="true" />
    <item android:drawable="@color/nw_row_master_normal" />
</selector>

该行响应点击事件但不响应被选中，即使记录器说该 View 确实被选中!这是怎么回事？

Answer 1

我不知道为什么 View 不会显示为选中状态，即使它被设置为选中状态，但这段代码应该可以工作:

使用ListView.setItemChecked():

mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
mListView.setItemChecked(position, isActivated);

选择器:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/row_master_detail_pressed"
          android:state_pressed="true" />
    <item android:drawable="@drawable/row_master_detail_focused"
          android:state_focused="true" />
    <item android:drawable="@color/nw_row_master_master_selected"
          android:state_activated="true" />
    <item android:drawable="@color/nw_row_master_normal" />
</selector>

因为 android:state_activated 仅在 Honeycomb 后可用，将此添加到 getView():

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
                // Highlight selected item
                if (position == selectedPos) {
                    view.setBackgroundColor((view.getResources()
                            .getColor(R.color.nw_row_master_selected)));
                } else {
                    Drawable sel = view.getResources().getDrawable(
                            R.drawable.selector_row_collection_master);
                    view.setBackgroundDrawable(sel);
                }
            }