保存bitmap到sdcard

File f = new File("/sdcard/kkpy/image" + getString(etv_name) + ".png");
		try {
			f.createNewFile();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println("在保存图片时出错：" + e.toString());
		}
		FileOutputStream fOut = null;
		try {
			fOut = new FileOutputStream(f);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		QR_bmp.compress(Bitmap.CompressFormat.PNG, 100, fOut);
		try {
			fOut.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}
		try {
			fOut.close();
		} catch (IOException e) {
			e.printStackTrace();
		}