0
我有一個線條圖,我希望實現不會每次都重新繪製網格。我嘗試了以下方法,但網格僅在第一次可見時,它會關閉saveLayer不起作用,或者我只是以錯誤的方式進行。如何儲存背景?
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);
}