Canvas.drawTextOnPath(...)无法在Lollipop上运行

Question

canvas.DrawTextOnPath似乎不适用于Lollipop设备.看到这里的差异.(Nexus 10图像正确但Lollipop显示不正确)

代码是一个简单的路径绘制.

// Path for the inner circle
unitPath = new Path();
unitPath.addArc(unitRect, 180.0f, 180.0f);

// Draw the text and the path
canvas.drawTextOnPath("Inner Circle", unitPath, 0.0f, 0.0f, unitPaint);
canvas.drawPath(unitPath,unitPaint);

对于想要查看此问题的人,可以在此处看到说明此问题的Android Studio测试项目. https://dl.dropboxusercontent.com/u/6768304/WebLinks/TestApp.rar

我需要在这台设备上做些什么"不同"吗？

Answer 1

好的，看来 DrawTextOnPath 现在有点破损，字体大小低于 1.0f

解决方案是将所有内容放大，绘制文本，然后将其缩小。

演示项目中的drawTitle方法将从此改变：

private void drawTitle(Canvas canvas) {
    canvas.drawTextOnPath(upperTitle, upperTitlePath, 0.0f, 0.02f, unitPaint);
    canvas.drawTextOnPath(lowerTitle, lowerTitlePath, 0.0f, 0.0f, unitPaint);
    canvas.drawTextOnPath(unitTitle, unitPath, 0.0f, 0.0f, unitPaint);
    canvas.drawPath(unitPath,unitPaint);
}

对此：

private void drawTitle(Canvas canvas) {
    //Save original font size
    float originalTextSize = unitPaint.getTextSize();

    // set a magnification factor
    final float magnifier = 100f;

    // Scale the canvas
    canvas.save();
    canvas.scale(1f / magnifier, 1f / magnifier);

    // create new rects and paths based on the new scale
    unitRect = new RectF();
    unitRect.set((faceRect.left + unitPosition) * magnifier, (faceRect.top + unitPosition) * magnifier, (faceRect.right - unitPosition) * magnifier, (faceRect.bottom - unitPosition) * magnifier);
    unitPath = new Path();
    unitPath.addArc(unitRect, 180.0f, 180.0f);

    titleRect = new RectF();
    titleRect.set((faceRect.left + titlePosition) * magnifier, (faceRect.top + titlePosition) * magnifier, (faceRect.right - titlePosition) * magnifier, (faceRect.bottom - titlePosition) * magnifier);
    upperTitlePath = new Path();
    upperTitlePath.addArc(titleRect, 180.0f, 180.0f);

    titleRect = new RectF();
    titleRect.set((faceRect.left + titlePosition) * magnifier, (faceRect.top + titlePosition) * magnifier, (faceRect.right - titlePosition) * magnifier, (faceRect.bottom - titlePosition) * magnifier);
    lowerTitlePath = new Path();
    lowerTitlePath.addArc(titleRect, -180.0f, -180.0f);

    // increase the font size
    unitPaint.setTextSize(originalTextSize * magnifier);

    // do the drawing of the text
    canvas.drawTextOnPath(unitTitle, unitPath, 0.0f, 0.0f, unitPaint);
    canvas.drawTextOnPath(upperTitle, upperTitlePath, 0.0f, 0.02f, unitPaint);
    canvas.drawTextOnPath(lowerTitle, lowerTitlePath, 0.0f, 0.0f, unitPaint);

    // bring everything back to normal
    canvas.restore();
    unitPaint.setTextSize(originalTextSize);

    canvas.drawPath(unitPath, unitPaint);
}