DrawerLayout.java 文件源码

@Override
protected void dispatchDraw(@NonNull Canvas canvas) {
    PaintFlagsDrawFilter pfd = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint
            .FILTER_BITMAP_FLAG);
    canvas.setDrawFilter(pfd);
    final int count = getChildCount();
    for (int i = 0; i < count; i++) {
        final View child = getChildAt(i);
        if (child == null)
            return;
    }
    super.dispatchDraw(canvas);
}