重新设置画布位图不能正常工作-resetingthecanvasbitmapdoesn'tworkcorrectly

i try to paint an arrow png on canvas with a png bitmap behind it. so every time i rotate the arrow i have to reset the background bitmap of the canvas becouse otherwise i would see duplicates of the old arrows.

我试着在画布上画一个带有png位图的箭头。所以每次我旋转箭头时，我都要重置画布的背景位图，否则我会看到旧箭头的重复。

i reset the background with:

我将背景重置为:

bMapLoad.eraseColor(0);

the problem is that sometimes it erases parts of the new arrow. sow that i sometimes only see a part of the arrow. i rotate it aber every 10-100 ms.

问题是有时它会擦去新箭头的部分。播种，我有时只看到箭头的一部分。我每10-100毫秒旋转一次。

can someone help me?

有人能帮助我吗?

i also tried:

我也试过:

bMapLoad=bMapcanvasBack.copy(bMapcanvasBack.getConfig(), true);
canvasLoad.setBitmap(bMapLoad);

this works fine but needs more memory. so is there a better way?

这个功能很好，但是需要更多的内存。那么有没有更好的方法呢?

edit:

编辑:

also

也

canvasLoad.drawColor(0, PorterDuff.Mode.CLEAR);

don't work

不工作

1 个解决方案