如何使表面視圖透明你好，我只想讓我的DrawinSurface視圖透明。我試了很多次，但都沒用。下面是我的xml代碼，以使我的表面視圖透明<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >     <FrameLayout         android:layout_width="fill_parent"         android:layout_height="fill_parent" >         <ImageView             android:id="@+id/imageView1"             android:layout_width="fill_parent"             android:layout_height="fill_parent"             android:src="@drawable/icon" >         </ImageView>         <LinearLayout             android:id="@+id/linearLayout1"             android:layout_width="fill_parent"             android:layout_height="fill_parent"             android:background="#00000000" >             <codewalla.android.drawings.DrawingSurface                 android:id="@+id/drawingSurface"                 android:layout_width="fill_parent"                 android:layout_height="fill_parent" >             </codewalla.android.drawings.DrawingSurface>         </LinearLayout>     </FrameLayout>     <LinearLayout         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:orientation="horizontal" >         <Button             android:id="@+id/colorRedBtn"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:layout_weight="10"             android:onClick="onClick"             android:text="R" />         <Button             android:id="@+id/colorBlueBtn"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:layout_weight="10"             android:onClick="onClick"             android:text="G" />       </LinearLayout></RelativeLayout>