Android Canvas.drawText 不渲染

Question

我有一个自定义 View ，可以在屏幕上绘制几个不同的东西。每一个都有自己的绘画对象。除了文字，一切都很好。它在 Gingerbread 中工作得很好，但 ICS+ 没有文本。

这是我的绘制方法:

protected void onDraw(Canvas canvas)
{
   canvas.save(Canvas.MATRIX_SAVE_FLAG);
   canvas.scale(getWidth(), getHeight());

   drawGrid(canvas);
   drawHeader(canvas);
   drawSelected(canvas);
   drawDays(canvas);
   drawToday(canvas);

   canvas.restore();
}

Grid、Selected 和 Today 工作正常。 Header 和 Days 是文本绘图，它们不起作用。

这里是 drawHeader 方法:

private void drawHeader(Canvas canvas)
{
   canvas.drawText("Sun", DAYS[0], .05f, paintDaysOfTheWeek);
   canvas.drawText("Mon", DAYS[1], .05f, paintDaysOfTheWeek);
   canvas.drawText("Tues", DAYS[2], .05f, paintDaysOfTheWeek);
   canvas.drawText("Wed", DAYS[3], .05f, paintDaysOfTheWeek);
   canvas.drawText("Thurs", DAYS[4], .05f, paintDaysOfTheWeek);
   canvas.drawText("Fri", DAYS[5], .05f, paintDaysOfTheWeek);
   canvas.drawText("Sat", DAYS[6], .05f, paintDaysOfTheWeek);

   canvas.drawLine(.01f, .0f, .99f, .0f, paintMediumBlack);
   canvas.drawLine(.01f, .07f, .99f, .07f, paintMediumBlack);
}

有什么想法吗？

Answer 1

我通过添加解决了这个问题

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
    setLayerType(LAYER_TYPE_SOFTWARE, paint)

到我的自定义 View 。不确定我为什么需要它，如果有人能解释一下，那就太好了。