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我有一个线条图,我希望实现不会每次都重新绘制网格。我尝试了以下方法,但网格仅在第一次可见时,它会关闭saveLayer不起作用,或者我只是以错误的方式进行。如何储存背景?
protected void onDraw(Canvas canvas) {
if (mRedrawGrid) {
drawGrid(canvas);
mGridLayer = canvas.saveLayer(0, 0, getWidth(), getHeight(), mPaint, Canvas.MATRIX_SAVE_FLAG);
} else
canvas.restoreToCount(mGridLayer);
drawLineChart(canvas);
}