android 札记 - Android Shadow 阴影制作

android 笔记 --- Android Shadow 阴影制作
在Android View 中, 要制作阴影,

可以利用 Paint 物件的 setShadowLayer 函数.

Java 程式码范例 :

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();             // --------------------------------------------            // 设定颜色            vPaint.setColor(0xFFFFFF00);             // 实心矩形            canvas.drawRect( 30                           , 50                           , 130                           , 150                           , vPaint                           );             // 设定阴影(柔边, X 轴位移, Y 轴位移, 阴影颜色)            vPaint .setShadowLayer (5, 3, 3, 0xFFFF00FF);             // 实心矩形& 其阴影            canvas.drawRect( 30                           , 200                           , 130                           , 300                           , vPaint                           );             // --------------------------------------------            // 设定颜色            vPaint2.setColor(0xFFFFFF00);             // 空心            vPaint2 .setStyle(Style.STROKE);             // 空心矩形            canvas.drawRect( 200                           , 50                           , 300                           , 150                           , vPaint2                           );             // 设定阴影(柔边, X 轴位移, Y 轴位移, 阴影颜色)            vPaint2 .setShadowLayer (5, 3, 3, 0xFFFF00FF);             // 空心矩形& 其阴影            canvas.drawRect( 200                           , 200                           , 300                           , 300                           , vPaint2                           );        }    }}