Question

我试图通过在自定义视图中覆盖onDraw以编程方式创建一个带有BlurMaskFilter图层（投影效果）的灰色Rect和黑色Rect。我可以让它在屏幕上绘制没有任何问题，但当我尝试将视图绘制到位图时，结果是不同的。在绘制到位图时，看起来BlueMaskFilter应用于View而不是黑色Rect的特定图层。

我所缺少的是使绘制的位图与屏幕上绘制的输出相同？

CustomView的onDraw覆盖：

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    //  draw black box (shadow) first
    RectF rectShadow = new RectF();
    rectShadow.set(10, 10, 120, 120);
    Paint shadowPaint = new Paint();
    shadowPaint.setMaskFilter(new BlurMaskFilter(5, Blur.NORMAL));
    shadowPaint.setStyle(Paint.Style.FILL);
    shadowPaint.setColor(Color.DKGRAY);
    shadowPaint.setAntiAlias(true);
    canvas.drawRect(rectShadow, shadowPaint);
    setLayerType(View.LAYER_TYPE_SOFTWARE, shadowPaint);

    // draw grey box
    RectF rectGray = new RectF();
    rectGray.set(0, 0, 100, 100);
    Paint paint = new Paint();
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.parseColor("#656565"));
    paint.setAntiAlias(true);
    canvas.drawRoundRect(rectGray, paint);
}

将视图保存到位图的功能：

public void saveViewToBitmap( View customView int outWidth, int outHeight ) {
    customView.setLayoutParams(new ViewGroup.LayoutParams(outWidth, outHeight));
    customView.measure(
        ViewGroup.MeasureSpec.makeMeasureSpec(customView.getLayoutParams().width, 
                                              ViewGroup.MeasureSpec.EXACTLY),
        ViewGroup.MeasureSpec.makeMeasureSpec(customView.getLayoutParams().height,
                                              ViewGroup.MeasureSpec.EXACTLY));
    customView.layout(0, 0, 
        customView.getMeasuredWidth(), customView.getMeasuredHeight());
    customView.requestLayout();

    Bitmap outputBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(outputBitmap);
    customView.draw(canvas);

    return outputBitmap;
}

请注意，在下面的图像中，屏幕图像的灰色矩形具有清晰的边缘，而绘制的位图使灰色矩形的顶部和左侧边缘模糊，以显示问题。

屏幕上的图片：http://i.stack.imgur.com/0Hl0t.png

从saveViewToBitmap创建的位图保存的图像：http://i.stack.imgur.com/xNzi5.png

谢谢！

将视图保存到位图的Android View.draw（位图）不能正确渲染BlurMaskFilter

0 个答案: