Android中常用的bitmap处理方法（bitmap工具类）

收集了很多bitmap相关的处理方法，几乎全部应用在项目中，所以特记录下！

[java] view plain copy

packagecom.tmacsky.utils;
importjava.io.ByteArrayOutputStream;
importjava.io.IOException;
importandroid.content.Context;
importandroid.content.res.Resources;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.Matrix;
importandroid.graphics.Paint;
importandroid.graphics.PixelFormat;
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;
importandroid.view.View;
importandroid.view.View.MeasureSpec;
publicclassImageUtils{
//--->bitmap相关
//参考网站http://www.cnblogs.com/fighter/archive/2012/02/20/android-bitmap-drawable.html
//见博客：http://blog.sina.com.cn/s/blog_afb547c60101j7qn.html
/**
*View转成bitmap
*@paramview
*@return
*/
publicstaticBitmapconvertViewToBitmap(Viewview){
view.setDrawingCacheEnabled(true);
view.measure(MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED));
view.layout(0,0,view.getMeasuredWidth(),view.getMeasuredHeight());
view.buildDrawingCache();
returnview.getDrawingCache();
}
/**
*缩放Drawable
*@paramdrawable
*@paramw缩放后需要的宽度
*@paramh缩放后需要的高度
*@return
*/
publicstaticDrawablezoomDrawable(Drawabledrawable,intw,inth){
intwidth=drawable.getIntrinsicWidth();
intheight=drawable.getIntrinsicHeight();
//drawable转换成bitmap
Bitmapoldbmp=drawableToBitmap(drawable);
//创建操作图片用的Matrix对象
Matrixmatrix=newMatrix();
//计算缩放比例
floatsx=((float)w/width);
floatsy=((float)h/height);
//设置缩放比例
matrix.postScale(sx,sy);
//建立新的bitmap，其内容是对原bitmap的缩放后的图
Bitmapnewbmp=Bitmap.createBitmap(oldbmp,0,0,width,height,
matrix,true);
returnnewBitmapDrawable(newbmp);
}
/**
*缩放bitmap
*@paramoldBitmap输入bitmap
*@paramnewWidth
*@paramnewHeight
*@return
*/
publicstaticBitmapzoomBitmap(BitmapoldBitmap,intnewWidth,intnewHeight){
//获得图片的宽高
intwidth=oldBitmap.getWidth();
intheight=oldBitmap.getHeight();
//计算缩放比例
floatscaleWidth=((float)newWidth)/width;
floatscaleHeight=((float)newHeight)/height;
//取得想要缩放的matrix参数
Matrixmatrix=newMatrix();
matrix.postScale(scaleWidth,scaleHeight);
//得到新的图片
Bitmapnewbm=Bitmap.createBitmap(oldBitmap,0,0,width,height,matrix,
true);
returnnewbm;
}
/**
*缩放网络图片依赖于zoomBitmap
*@paramimg
*@paramnewWidth
*@paramnewHeight
*@return
*/
publicstaticBitmapzoomImg(Stringimg,intnewWidth,intnewHeight){
//图片源
Bitmapbm=BitmapFactory.decodeFile(img);
if(null!=bm){
returnzoomBitmap(bm,newWidth,newHeight);
}
returnnull;
}
/**
*缩放网络图片依赖于zoomBitmap
*@paramcontext
*@paramimg
*@paramnewWidth
*@paramnewHeight
*@return
*/
publicstaticBitmapzoomImg(Contextcontext,Stringimg,intnewWidth,
intnewHeight){
//图片源
try{
Bitmapbm=BitmapFactory.decodeStream(context.getAssets()
.open(img));
if(null!=bm){
returnzoomBitmap(bm,newWidth,newHeight);
}
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
returnnull;
}
/**
*判断bitmap是否存在
*@parambitmap
*@return
*/
publicstaticbooleanbitmapAvailable(Bitmapbitmap){
returnbitmap!=null&&bitmap.getWidth()>0&&bitmap.getHeight()>0;
}
/**
*drawable转成bitmap
*@paramdrawable
*@return
*/
publicstaticBitmapdrawableToBitmap(Drawabledrawable){
//取drawable的长宽
intw=drawable.getIntrinsicWidth();
inth=drawable.getIntrinsicHeight();
//取drawable的颜色格式
Bitmap.Configconfig=drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
:Bitmap.Config.RGB_565;
//建立对应bitmap
Bitmapbitmap=Bitmap.createBitmap(w,h,config);
//建立对应bitmap的画布
Canvascanvas=newCanvas(bitmap);
drawable.setBounds(0,0,w,h);
//把drawable内容画到画布中
drawable.draw(canvas);
returnbitmap;
}
/**
*Bitmap转换成Drawable
*@paramcontext
*@parambitmap
*@return
*/
publicstaticDrawablebitmapToDrawable(Contextcontext,Bitmapbitmap){
//因为BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。
BitmapDrawablebd=newBitmapDrawable(context.getResources(),bitmap);
returnbd;
}
/**
*从资源中获取Bitmap
*@paramcontext
*@paramreqR.drawable.icon(eg.)
*@return
*/
publicBitmapgetBitmapFromResources(Contextcontext,intreq){
Resourcesres=context.getResources();
Bitmapbmp=BitmapFactory.decodeResource(res,req);
returnbmp;
}
/**
*Byte[]->Bitmap的转换
*/
publicBitmapBytes2Bimap(byte[]b){
if(b.length!=0){
returnBitmapFactory.decodeByteArray(b,0,b.length);
}else{
returnnull;
}
}
/**
*Bitmap->Byte[]的转换
*@parambm
*@return
*/
publicbyte[]Bitmap2Bytes(Bitmapbm){
ByteArrayOutputStreambaos=newByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG,100,baos);
returnbaos.toByteArray();
}
/**
*获取圆角图片
*@parambitmap
*@paramroundPx圆角的弧度
*@return
*/
publicstaticBitmapgetRoundedCornerBitmap(Bitmapbitmap,floatroundPx){
intw=bitmap.getWidth();
inth=bitmap.getHeight();
Bitmapoutput=Bitmap.createBitmap(w,h,Config.ARGB_8888);
Canvascanvas=newCanvas(output);
finalintcolor=0xff424242;
finalPaintpaint=newPaint();
finalRectrect=newRect(0,0,w,h);
finalRectFrectF=newRectF(rect);
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;
}
}

转自：http://blog.csdn.net/tmacsky/article/details/38121283

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