Use view in an XML file on Android to draw a line above a control; Android:listselector's property description; android:visibility= "Gone"

First, for example relativelayout in android:visibility= "Gone"

It has three properties: visible display; invisible display black background bar; gone not displayed

In a class, you can set its display or not, setvisibility (View.gone);

Setvisibility (view.visible); display

Second, the attribute description of Android:listselector

<gridview
Android:id= "@+id/gridview_numberkeyboard"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_alignparentbottom= "true"
Android:layout_marginbottom= "0DP"
Android:background= "#efeff4"
android:gravity= "Center"
Android:horizontalspacing= "1DP"
Android:numcolumns= "3"
android:verticalspacing= "1DP" >
</GridView>

When you click on an item in the GridView as shown above, the orange display background (the Android system default color) is displayed.

If you want to set a colorless (transparent color, no system background color), and set their own click Effect, just set the above settings android:listselector= "@android: Color/transparent"

(iii) Use view to draw a line above a control in an XML file

<view
Android:id= "@+id/view_line"
Android:layout_width= "Match_parent"
android:layout_height= "1DP"//height of the line
android:layout_aligntop= "@id/gridview_numberkeyboard"//Line aligns with a control
android:background= "#efeff4" >
</View>

Use view in an XML file on Android to draw a line above a control; Android:listselector's property description; android:visibility= "Gone"