移动应用程序共享偏好保存和调用用户登录

Mobile Application Shared Preferences Saving and Calling User Login(移动应用程序共享偏好保存和调用用户登录)

问题描述

目前我的应用程序正在设备"表中搜索现有设备以启用登录访问.但是，我想在每次需要登录时注册一个新设备，并让他们在每次应用程序运行时绕过登录页面.目前，该应用程序说打开时存在无效凭据，因为用户名和密码未正确保存.我该如何解决?

Currently my application is searching for an existing device in "Device" table to enable login access. However, I want to register a new device every time they're required to log in and have them bypass the login page every time the application runs. Currently, the application says there's invalid credentials upon opening since the username and password aren't being saved properly. How do I solve this?

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    // declaring variables
    etUsername = (EditText)findViewById(R.id.etUsername);
    etPassword= (EditText)findViewById(R.id.etPassword);
    btnLogin = (Button)findViewById(R.id.btnLogin);
    etIpAddress = (EditText) findViewById(R.id.etIpAddress);
    String username = etUsername.getText().toString();
    String password = etPassword.getText().toString();
    String ipAddress = etIpAddress.getText().toString();

    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(LoginActivity.this);
    if (sharedPreferences.contains("ip")) {
        performLogin(username, password, sharedPreferences.getString("ip", ipAddress));
    }

    // setting up things for login button
    btnLogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String ipAddress = etIpAddress.getText().toString();

            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(LoginActivity.this);

            sharedPreferences.edit()
                    .putString("ip", ipAddress)
                    .apply();

            String username = etUsername.getText().toString().trim();
            String password = etPassword.getText().toString().trim();

            performLogin(username, password, ipAddress);
        }
    });
}

private void performLogin(String username, String password, String ipAddress) {
    try {
        Device.login(username, password, ipAddress, this);
    } catch (JSONException e) {
        onLoginFailure(e);
    }
}

推荐答案

为了保存登录凭据，我们始终遵循以下代码:-public static final String MyPREFERENCES = "MyPrefs" ;

For saving login credentials we always follow these code:- public static final String MyPREFERENCES = "MyPrefs" ;

   public static final String Name = "nameKey";
   public static final String Phone = "phoneKey";
   public static final String Email = "ip";
   SharedPreferences.Editor editor = sharedpreferences.edit();

            editor.putString(Name, n);
            editor.putString(Phone, ph);
            editor.putString(ip, e);
            editor.commit();

我认为你必须在你的代码中使用那个东西而不是 apply() meth

I think you must use that thing in your code rather then apply() meth

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