SharedPreferences

private void saveAccount(String username, String password) {
        SharedPreferences sp = this.getPreferences(this.MODE_PRIVATE); // 获得Preferences
      SharedPreferences.Editor editor = sp.edit(); // 获得Editor
      editor.putString("username", username); // 将用户名存入Preferences
      editor.putString("password", password); // 将密码存入Preferences
      editor.commit();
     }
    
    private Map<String, String> getAccount(){
      SharedPreferences sp = this.getPreferences(this.MODE_PRIVATE);
      Map<String, String> m = new Map<String, String>();
      m.put("username", sp.getString("username", ""));
      m.put("password", sp.getString("password", ""));
    }