1-你必须找到你想保存图像的路径。
2-打开一个OutputStream对象并给予它文件路径。
3-将位图保存到输出流。
4-同花
5-很近。

// Get environment dir
String path = Environment.getExternalStorageDirectory().toString();
OutputStream fOut = null;
File file = new File(path, "MyImage"+".jpg"); // the File to save to
fOut = new FileOutputStream(file);
Bitmap pictureBitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath(), optons); // obtaining the Bitmap
pictureBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut); // saving the Bitmap to a file compressed as a JPEG with 85% compression rate
fOut.flush(); // Not really required
fOut.close(); // do not forget to close the stream