引用：http://www.linuxidc.com/Linux/2011-09/43131.htm
// 简单的比较两个图像是否一致
private boolean compare2Image(Bitmap bmp1,Bitmap bmp2)
{
int iteration = 0;
int width = bmp1.getWidth();
int height = bmp1.getHeight();
if(width != bmp2.getWidth()) return false;
if(height != bmp2.getHeight()) return false;
if(width < height)
{
iteration = width;
}
else
{
iteration = height;
}
for(int i = 0; i < iteration; ++i)
{
if(bmp1.getPixel(i, i) != bmp2.getPixel(i,i)) return false;
}
return true;
}