如何在手指按压和手指释放时更改列表视图背景梯度

Question

如何在点击时改变背景梯度，并在手指释放时获得原始梯度…我使用列表视图适配器创建的列表确实更改为梯度，但当我抬起手指时不会更改回原始梯度。

下面的xml

main。xml

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:divider="#EDEDED"
    android:dividerHeight="1dp"
    android:listSelector="@drawable/list_selector"
  />

listrongelector.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Selector style for listrow -->
<item android:state_focused="true"
    android:drawable="@drawable/gradient_bg_hover"
    />
<item
 android:state_selected="false"
    android:state_pressed="false"
    android:drawable="@drawable/gradient_bg" />
    <item android:state_pressed="true"
    android:drawable="@drawable/gradient_bg_hover" />
   <item android:state_selected="true"
    android:state_pressed="false"
    android:drawable="@drawable/gradient_bg_hover" />
</selector>

row_list.xml

 <TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/txtListText"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:padding="15dp"
    android:textSize="45sp"

    />

gradient_bg和gradient_bghover是gradient xml的..

Answer 1

我认为，你不能一次定义state_selected和state_pressed…

正常工作的东西应该是这样的:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:drawable="@drawable/_bt_week_selected" />
    <item android:state_focused="true" android:drawable="@drawable/_bt_week_selected"/>
    <item android:state_pressed="true" android:drawable="@drawable/_bt_week_selected"/>
    <item android:drawable="@drawable/_bt_week_normal"/>
</selector>

并将列表项(row_list)的背景设置为选择器…比如android:background="@drawable/selector"……而不是用android:listSelector="@drawable/list_selector"