我有一个CustomView工作在前Lollipop,现在我尝试在Lollipop设备上应用
android：elevation和android：translateZ但似乎不起作用.
<com.example.CustomView
android:id="@+id/myview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:elevation="10dp">
</com.example.CustomView>
我错过了什么？
解决方法
如
Defining Shadows and Clipping Views所述
您应该实现ViewOutlineProvider抽象类,View构建其Outline,用于阴影投射和剪切
矩形CustomView
public class CustomView extends View {
// ..
@Override
protected void onSizeChanged(int w,int h,int oldw,int oldh) {
/// ..
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
setOutlineProvider(new CustomOutline(w,h));
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private class CustomOutline extends ViewOutlineProvider {
int width;
int height;
CustomOutline(int width,int height) {
this.width = width;
this.height = height;
}
@Override
public void getOutline(View view,Outline outline) {
outline.setRect(0,width,height);
}
}
//...
}
