當我點擊一個 listview item 時，為什么沒有 selector 出現？帖下我的代碼：ListView：<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:layout_width= "wrap_content" android:id="@+id/streamRelativeLayout">     <ListView android:layout_height="fill_parent" android:layout_width="fill_parent" android:id="@+id/streamListView" android:cach     eColorHint="#00000000" android:fadingEdge="none" android:listSelector="@drawable/swipeview_list_selector">   </ListView>     <TextView android:layout_centerInParent="true" android:layout_height="wrap_content" android:id="@+id/noStreamTextView" androi     d:layout_width="wrap_content" android:text="No Stream Available" android:visibility="invisible"></TextView>     <ProgressBar android:layout_centerInParent="true" android:layout_height="wrap_content" android:id="@+id/streamProgressBar" a     ndroid:layout_width="wrap_content"></ProgressBar> </RelativeLayout>my selector:<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android">   <item android:state_enabled="false" android:state_focused="true"         android:drawable="@drawable/stocks_gradient" />   <item android:state_pressed="true"         android:drawable="@drawable/stocks_gradient" />   <item android:state_focused="true"         android:drawable="@drawable/stocks_gradient" /> </selector>gradient:<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android">     <gradient          android:startColor="#ECECEC"         android:centerColor="#F6F6F4"         android:endColor="#F8F8F6"         android:angle="90"         android:dither="true"      /> </shape>我同時也在 getView()里設置了顏色轉換int colorPos = position % colors.length;             v.setBackgroundColor(colors[colorPos]);