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ContentResolver cr = this.getContentResolver();
try
{
InputStream in = cr.openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(in);
try
{
in.close();
}
catch (IOException e)
{
e.printStackTrace();
}
if(null == bitmap)
{
Toast.makeText(this, "Head is not set successful,Decode bitmap failure", 2000);
}
//原始图片的尺寸
int bmpWidth = bitmap.getWidth();
int bmpHeight = bitmap.getHeight();

//缩放图片的尺寸
float scaleWidth = (float) 40 / bmpWidth;
float scaleHeight = (float) 40 / bmpHeight;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);

//产生缩放后的Bitmap对象
Bitmap resizeBitmap = Bitmap.createBitmap(
bitmap, 0, 0, bmpWidth, bmpHeight, matrix, false);
bitmap.recycle();
//Bitmap to byte[]
byte[] photoData = Bitmap2Bytes(resizeBitmap);

//save file
String fileName = "/sdcard/test.jpg";
FileUtil.writeToFile(fileName, photoData);

//save photo check sum to db
DataCenter.GetInstance().ModifyIMMUser();
//refresh ImageView
}
catch (FileNotFoundException exp)
{
exp.printStackTrace();
}