Android 数据回显

public class EchoDataUtils {
    /**
     * 保存文件到手机内存
     * @param context
     * @param number
     * @param psw
     * @return
     */
    public static boolean SaveUserInfo(Context context, String number,
                                       String psw) {
        try {
            File fileDir = context.getFilesDir();
            File f = new File(fileDir, "data.txt");
            FileOutputStream fos;

            fos = new FileOutputStream(f);

            String data = number + "##" + psw;
            fos.write(data.getBytes());
            fos.flush();
            fos.close();
            return true;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }
    /**
     * 从手机内存读取
     * @param context
     * @return
     */
    public static Map<String, String> GetUserInfo(Context context) {

        try {
            File fileDir = context.getFilesDir();
            File f = new File(fileDir, "data.txt");
            FileInputStream fis;
            fis = new FileInputStream(f);
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    fis));
            String text = reader.readLine();
            if (!text.isEmpty()) {
                String split[] = text.split("##");
                Map<String, String> userInfoMap = new HashMap<String, String>();
                userInfoMap.put("number", split[0]);
                userInfoMap.put("psw", split[1]);
                return userInfoMap;
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;

    }
}