图片水印的生成方法
生成水印的过程。其实分为三个环节：第一，载入原始图片；第二，载入水印图片；第三，保存新的图片。
/**
* create the?bitmap?from a byte array
*
* @param src the?bitmap?object you want proecss
* @param watermark the water mark above the src
* @return return a?bitmap?object ,if paramter’s length is 0,return null
*/
private?Bitmap createBitmap( Bitmap src, Bitmap watermark )
{
String tag =?”createBitmap”;
Log.d( tag,?”create a new?bitmap”?);
if( src ==?null?)
{
return?null;
}
int?w = src.getWidth();
int?h = src.getHeight();
int?ww = watermark.getWidth();
int?wh = watermark.getHeight();
//create the new blank?bitmap
Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//创建一个新的和SRC长度宽度一样的位图
Canvas cv =?new?Canvas( newb );
//draw src into
cv.drawBitmap( src,?0,?0,?null?);//在 0，0坐标开始画入src
//draw watermark into
cv.drawBitmap( watermark, w – ww +?5, h – wh +?5,?null?);//在src的右下角画入水印
//save all clip
cv.save( Canvas.ALL_SAVE_FLAG );//保存
//store
cv.restore();//存储
return?newb;
}
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