Android Shadow 阴影制作[转]

public class helloWorld extends Activity {
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView( new drawCanvas(this) );
    }
   
    class drawCanvas extends View {
       
        public drawCanvas(Context context) {
            super(context);
        }
       
        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            
            // 建立 Paint 物件
            Paint vPaint = new Paint();
            Paint vPaint2 = new Paint();
            
            // --------------------------------------------
            // 設定顏色
            vPaint.setColor(0xFFFFFF00);
           
            // 實心矩形
            canvas.drawRect( 30
                           , 50
                           , 130
                           , 150
                           , vPaint
                           );
           
            // 設定陰影 (柔邊, X 軸位移, Y 軸位移, 陰影顏色)
            vPaint.setShadowLayer(5, 3, 3, 0xFFFF00FF);
           
            // 實心矩形 & 其陰影
            canvas.drawRect( 30
                           , 200
                           , 130
                           , 300
                           , vPaint
                           );
           
            // --------------------------------------------
            // 設定顏色
            vPaint2.setColor(0xFFFFFF00);
           
            // 空心
            vPaint2.setStyle(Style.STROKE);
           
            // 空心矩形
            canvas.drawRect( 200
                           , 50
                           , 300
                           , 150
                           , vPaint2
                           );
           
            // 設定陰影 (柔邊, X 軸位移, Y 軸位移, 陰影顏色)
            vPaint2.setShadowLayer(5, 3, 3, 0xFFFF00FF);
           
            // 空心矩形 & 其陰影
            canvas.drawRect( 200
                           , 200
                           , 300
                           , 300
                           , vPaint2
                           );
        }
    }
}