android 保存bitmap到SD卡

public void saveMyBitmap(String bitName,Bitmap mBitmap){
File f = new File(Environment.getExternalStorageDirectory()					, fileName);
FileOutputStream fOut = null;
try {
f.createNewFile();
fOut = new FileOutputStream(f);
} catch (IOException e) {
e.printStackTrace();
}
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
try {
fOut.flush();
fOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}