如何设置描边颜色以在 canvas 上绘制矩形？

Question

我想画一个蓝色描边红色填充的圆角矩形，但是在画图class中找不到设置描边颜色的方法。我该怎么做？

    mCanvas.drawColor(mBackgroundColor, PorterDuff.Mode.CLEAR);
    mCanvas.setDrawFilter(mPaintFlagsDrawFilter);

    mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
    mPaint.setColor(Color.RED);
    mPaint.setStrokeWidth(2);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mRectF.set(0, 0, mWidth, mHeight);
    mCanvas.drawRoundRect(mRectF, 10, 10, mPaint);

Answer 1

Paint 一次只允许一种颜色。

mCanvas.drawColor(mBackgroundColor, PorterDuff.Mode.CLEAR);
mCanvas.setDrawFilter(mPaintFlagsDrawFilter);

mFillPaint.setStyle(Paint.Style.FILL);
mFillPaint.setColor(Color.RED);
mStrokePaint.setStyle(Paint.Style.STROKE);
mStrokePaint.setColor(Color.BLUE);
mStrokePaint.setStrokeWidth(2);
mStrokePaint.setStrokeCap(Paint.Cap.ROUND);
mRectF.set(0, 0, mWidth, mHeight);
mCanvas.drawRoundRect(mRectF, 10, 10, mFillPaint);
mCanvas.drawRoundRect(mRectF, 10, 10, mStrokePaint);

如果您发现您的圆角矩形看起来不正确，它可能会在视图的边界处被剪裁。调整 RectF 以允许 StrokeWidth 的一半：

mRectF.set(1, 1, mWidth - 1, mHeight - 1);

如何设置描边颜色以在 canvas 上绘制矩形？

How to set stroke color to draw a rectangle on canvas?

android

android-canvas