android 处理图片工具类

importjava.io.ByteArrayOutputStream;
importjava.io.File;
importjava.io.FileNotFoundException;
importjava.io.FileOutputStream;
importjava.io.IOException;

importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.ColorMatrix;
importandroid.graphics.ColorMatrixColorFilter;
importandroid.graphics.Paint;
importandroid.graphics.PorterDuffXfermode;
importandroid.graphics.Rect;
importandroid.graphics.RectF;
importandroid.graphics.Bitmap.Config;
importandroid.graphics.PorterDuff.Mode;
importandroid.graphics.drawable.BitmapDrawable;
importandroid.graphics.drawable.Drawable;

/**
*处理图片的工具类.
*/
publicclassimageTool{
publicstaticfinalintLEFT=0;
publicstaticfinalintRIGHT=1;
publicstaticfinalintTOP=3;
publicstaticfinalintBOTTOM=4;

/***/
/**
*图片去色,返回灰度图片
*
*@parambmpOriginal
*传入的图片
*@return去色后的图片
*/
publicstaticBitmaptoGrayscale(BitmapbmpOriginal){
intwidth,height;
height=bmpOriginal.getHeight();
width=bmpOriginal.getWidth();
BitmapbmpGrayscale=Bitmap.createBitmap(width,height,
Bitmap.Config.RGB_565);
Canvasc=newCanvas(bmpGrayscale);
Paintpaint=newPaint();
ColorMatrixcm=newColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilterf=newColorMatrixColorFilter(cm);
paint.setColorFilter(f);
c.drawBitmap(bmpOriginal,0,0,paint);
returnbmpGrayscale;
}

/***/
/**
*去色同时加圆角
*
*@parambmpOriginal
*原图
*@parampixels
*圆角弧度
*@return修改后的图片
*/
publicstaticBitmaptoGrayscale(BitmapbmpOriginal,intpixels){
returntoRoundCorner(toGrayscale(bmpOriginal),pixels);
}

/***/
/**
*把图片变成圆角
*
*@parambitmap
*需要修改的图片
*@parampixels
*圆角的弧度
*@return圆角图片
*/
publicstaticBitmaptoRoundCorner(Bitmapbitmap,intpixels){
Bitmapoutput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
.getHeight(),Config.ARGB_8888);
Canvascanvas=newCanvas(output);
finalintcolor=0xff424242;
finalPaintpaint=newPaint();
finalRectrect=newRect(0,0,bitmap.getWidth(),bitmap.getHeight());
finalRectFrectF=newRectF(rect);
finalfloatroundPx=pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0,0,0,0);
paint.setColor(color);
canvas.drawRoundRect(rectF,roundPx,roundPx,paint);
paint.setXfermode(newPorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap,rect,rect,paint);
returnoutput;
}

/***/
/**
*使圆角功能支持BitampDrawable
*
*@parambitmapDrawable
*@parampixels
*@return
*/
publicstaticBitmapDrawabletoRoundCorner(BitmapDrawablebitmapDrawable,
intpixels){
Bitmapbitmap=bitmapDrawable.getBitmap();
bitmapDrawable=newBitmapDrawable(toRoundCorner(bitmap,pixels));
returnbitmapDrawable;
}

/**
*读取路径中的图片，然后将其转化为缩放后的bitmap
*
*@parampath
*/
publicstaticvoidsaveBefore(Stringpath){
BitmapFactory.Optionsoptions=newBitmapFactory.Options();
options.inJustDecodeBounds=true;
//获取这个图片的宽和高
Bitmapbitmap=BitmapFactory.decodeFile(path,options);//此时返回bm为空
options.inJustDecodeBounds=false;
//计算缩放比
intbe=(int)(options.outHeight/(float)200);
if(be<=0)
be=1;
options.inSampleSize=2;//图片长宽各缩小二分之一
//重新读入图片，注意这次要把options.inJustDecodeBounds设为false哦
bitmap=BitmapFactory.decodeFile(path,options);
intw=bitmap.getWidth();
inth=bitmap.getHeight();
System.out.println(w+""+h);
//savePNG_After(bitmap,path);
saveJPGE_After(bitmap,path);
}

/**
*保存图片为PNG
*
*@parambitmap
*@paramname
*/
publicstaticvoidsavePNG_After(Bitmapbitmap,Stringname){
Filefile=newFile(name);
try{
FileOutputStreamout=newFileOutputStream(file);
if(bitmap.compress(Bitmap.CompressFormat.PNG,100,out)){
out.flush();
out.close();
}
}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}

/**
*保存图片为JPEG
*
*@parambitmap
*@parampath
*/
publicstaticvoidsaveJPGE_After(Bitmapbitmap,Stringpath){
Filefile=newFile(path);
try{
FileOutputStreamout=newFileOutputStream(file);
if(bitmap.compress(Bitmap.CompressFormat.JPEG,100,out)){
out.flush();
out.close();
}
}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}

/**
*水印
*
*@parambitmap
*@return
*/
publicstaticBitmapcreateBitmapForWatermark(Bitmapsrc,Bitmapwatermark){
if(src==null){
returnnull;
}
intw=src.getWidth();
inth=src.getHeight();
intww=watermark.getWidth();
intwh=watermark.getHeight();
//createthenewblankbitmap
Bitmapnewb=Bitmap.createBitmap(w,h,Config.ARGB_8888);//创建一个新的和SRC长度宽度一样的位图
Canvascv=newCanvas(newb);
//drawsrcinto
cv.drawBitmap(src,0,0,null);//在0，0坐标开始画入src
//drawwatermarkinto
cv.drawBitmap(watermark,w-ww+5,h-wh+5,null);//在src的右下角画入水印
//saveallclip
cv.save(Canvas.ALL_SAVE_FLAG);//保存
//store
cv.restore();//存储
returnnewb;
}

/**
*图片合成
*
*@return
*/
publicstaticBitmappotoMix(intdirection,Bitmap...bitmaps){
if(bitmaps.length<=0){
returnnull;
}
if(bitmaps.length==1){
returnbitmaps[0];
}
BitmapnewBitmap=bitmaps[0];
//newBitmap=createBitmapForFotoMix(bitmaps[0],bitmaps[1],direction);
for(inti=1;i<bitmaps.length;i++){
newBitmap=createBitmapForFotoMix(newBitmap,bitmaps[i],direction);
}
returnnewBitmap;
}

privatestaticBitmapcreateBitmapForFotoMix(Bitmapfirst,Bitmapsecond,
intdirection){
if(first==null){
returnnull;
}
if(second==null){
returnfirst;
}
intfw=first.getWidth();
intfh=first.getHeight();
intsw=second.getWidth();
intsh=second.getHeight();
BitmapnewBitmap=null;
if(direction==LEFT){
newBitmap=Bitmap.createBitmap(fw+sw,fh>sh?fh:sh,
Config.ARGB_8888);
Canvascanvas=newCanvas(newBitmap);
canvas.drawBitmap(first,sw,0,null);
canvas.drawBitmap(second,0,0,null);
}elseif(direction==RIGHT){
newBitmap=Bitmap.createBitmap(fw+sw,fh>sh?fh:sh,
Config.ARGB_8888);
Canvascanvas=newCanvas(newBitmap);
canvas.drawBitmap(first,0,0,null);
canvas.drawBitmap(second,fw,0,null);
}elseif(direction==TOP){
newBitmap=Bitmap.createBitmap(sw>fw?sw:fw,fh+sh,
Config.ARGB_8888);
Canvascanvas=newCanvas(newBitmap);
canvas.drawBitmap(first,0,sh,null);
canvas.drawBitmap(second,0,0,null);
}elseif(direction==BOTTOM){
newBitmap=Bitmap.createBitmap(sw>fw?sw:fw,fh+sh,
Config.ARGB_8888);
Canvascanvas=newCanvas(newBitmap);
canvas.drawBitmap(first,0,0,null);
canvas.drawBitmap(second,0,fh,null);
}
returnnewBitmap;
}

/**
*将Bitmap转换成指定大小
*
*@parambitmap
*@paramwidth
*@paramheight
*@return
*/
publicstaticBitmapcreateBitmapBySize(Bitmapbitmap,intwidth,intheight){
returnBitmap.createScaledBitmap(bitmap,width,height,true);
}

/**
*Drawable转Bitmap
*
*@paramdrawable
*@return
*/
publicstaticBitmapdrawableToBitmapByBD(Drawabledrawable){
BitmapDrawablebitmapDrawable=(BitmapDrawable)drawable;
returnbitmapDrawable.getBitmap();
}

/**
*Bitmap转Drawable
*
*@parambitmap
*@return
*/
publicstaticDrawablebitmapToDrawableByBD(Bitmapbitmap){
Drawabledrawable=newBitmapDrawable(bitmap);
returndrawable;
}

/**
*byte[]转bitmap
*
*@paramb
*@return
*/
publicstaticBitmapbytesToBimap(byte[]b){
if(b.length!=0){
returnBitmapFactory.decodeByteArray(b,0,b.length);
}else{
returnnull;
}
}

/**
*bitmap转byte[]
*
*@parambm
*@return
*/
publicstaticbyte[]bitmapToBytes(Bitmapbm){
ByteArrayOutputStreambaos=newByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG,100,baos);
returnbaos.toByteArray();
}
}

转载：http://www.cnblogs.com/TerryBlog/archive/2012/01/08/2316482.html

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