图片压缩

//对图片进行压缩
BitmapFactory.Optionsoptions=newBitmapFactory.Options();
options.inJustDecodeBounds=true;

//获取这个图片的宽和高
Bitmapbitmap=BitmapFactory.decodeFile("/sdcard/dcim/Camera/hello.jpg",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=be;
//重新读入图片，注意这次要把options.inJustDecodeBounds设为false哦
bitmap=BitmapFactory.decodeFile("/sdcard/dcim/Camera/hello.jpg",options);
intw=bitmap.getWidth();
inth=bitmap.getHeight();
System.out.println(w+""+h);
myImageView.setImageBitmap(bitmap);


//保存入sdCard
Filefile2=newFile("/sdcard/dcim/Camera/test.jpg");
try{
FileOutputStreamout=newFileOutputStream(file2);
if(bitmap.compress(Bitmap.CompressFormat.JPEG,100,out)){
out.flush();
out.close();
}
}catch(Exceptione){
//TODO:handleexception
}


//读取sd卡
Filefile=newFile("/sdcard/dcim/Camera/test.jpg");
intmaxBufferSize=16*1024;

intlen=0;
ByteArrayOutputStreamoutStream=newByteArrayOutputStream();
BufferedInputStreambufferedInputStream;
try{
bufferedInputStream=newBufferedInputStream(newFileInputStream(file));
intbytesAvailable=bufferedInputStream.available();
intbufferSize=Math.min(bytesAvailable,maxBufferSize);
byte[]buffer=newbyte[bufferSize];
while((len=bufferedInputStream.read(buffer))!=-1)
{
outStream.write(buffer,0,bufferSize);
}
data=outStream.toByteArray();
outStream.close();
bufferedInputStream.close();

}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}