android画图---Layer

在Layers例程中 主要使用了
private static final int LAYER_FLAGS = //Canvas.MATRIX_SAVE_FLAG |
                                           Canvas.CLIP_SAVE_FLAG |
                                            //Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
                                      Canvas.FULL_COLOR_LAYER_SAVE_FLAG |
                                           Canvas.CLIP_TO_LAYER_SAVE_FLAG;

这个参数的不同组合 只是没有具体高清有啥具体的效果，只是懂得 最底层可以不显示

@Override protected void onDraw(Canvas canvas) {
            canvas.drawColor(Color.WHITE);           
           
            canvas.translate(10, 10);
           
            canvas.saveLayerAlpha(0, 0, 200, 200, 0x66, LAYER_FLAGS);
           
            mPaint.setColor(Color.RED);
            canvas.drawCircle(75, 75, 75, mPaint);
            mPaint.setColor(Color.BLUE);
            canvas.drawCircle(125, 125, 75, mPaint);
           
            canvas.restore();