Android 实现画图并保存图片
2010-08-21 06:25:00 来源:WEB开发网return newb;
}
/**
* 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;
}
对图片进行缩小的方法:
Java代码
/**
* lessen the bitmap
*
* @param src bitmap
* @param destWidth the dest bitmap width
* @param destHeigth
* @return new bitmap if successful ,oherwise null
*/
private Bitmap lessenBitmap( Bitmap src, int destWidth, int destHeigth )
{
String tag = "lessenBitmap";
if( src == null )
{
return null;
}
int w = src.getWidth();//源文件的大小
int h = src.getHeight();
// calculate the scale - in this case = 0.4f
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