我試圖爲應用程序創建一個acsess代碼

Question

我想爲Android應用程序創建一個訪問屏幕，其中用戶提交一次訪問代碼然後將其保存到一個文件，在以後啓動屏幕應該是跳過，它應該直接進入後面的佈局。

我不知道如何做到這一切。

Answer 1

它叫做SharedPreferences。將您的訪問代碼保存在SharedPreference中，並檢查是否有任何問題。之後，你不會有任何問題。

SharedPreferences tutorial

希望它能幫助。乾杯!

Answer 2

我會推薦最好的方法。無論什麼時候你被困在這樣的事情上，啓動屏幕將幫助你。你可以在啓動畫面上看到我正在檢查我是否曾經登錄過，並使用它轉移到其他活動。

讓我來解釋如何： -

只是要啓動屏幕啓動活動。如果你不想讓它顯示更長的時間，只需讓處理程序運行1-2秒。現在看下面的代碼。

SplashScreen.java

public class SplashScreen extends AppCompatActivity { 

    private String email; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 

     setContentView(R.layout.activity_splash); 

     //SharedPreference to Store API Result 
     SharedPreferences pref = getApplicationContext().getSharedPreferences("CachedResponse", 0); 
     SharedPreferences.Editor editor = pref.edit(); 
     editor.apply(); 

     email = pref.getString("login", null); 

     int SPLASH_TIME_OUT = 3000; 

     if (email != null) { 

      //It means User is already Logged in so I will take the user to Select_College Screen 

      new Handler().postDelayed(new Runnable() { 

       @Override 
       public void run() { 

        Intent intent = new Intent(SplashScreen.this, Select_College.class); 
        intent.putExtra("Email", email); 
        startActivity(intent); 
        finish(); 

       } 

      }, SPLASH_TIME_OUT); 

     } else { 

      //It means User is not Logged in so I will take the user to Login Screen 

      new Handler().postDelayed(new Runnable() { 

       @Override 
       public void run() { 

        Intent intent = new Intent(SplashScreen.this, Login.class); 
        startActivity(intent); 
        finish(); 

       } 

      }, SPLASH_TIME_OUT); 

     } 

    } 
} 

Login.java

public class Login extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_doctor_login); 

     //SharedPreference to Store API Result 
     pref = getApplicationContext().getSharedPreferences("CachedResponse", 0); 

     Login(); 

    } 

    private void login() { 

     //If login is successfull, before moving to next activity, store something in sharedpreference with name login. It can be email or just a string as "true" 

     SharedPreferences.Editor editor = pref.edit(); 
         editor.putString("login", email); 
         editor.apply(); 

         Intent intent = new Intent(DoctorLogin.this, Select_Collage.class); 
         intent.putExtra("Email", email); 
         startActivity(intent); 
         finish(); 

    } 
} 

Select_Collage.java

public class Select_Collage extends AppCompatActivity { 

    private SharedPreferences pref; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_doctor_message); 

     //SharedPreference to Store API Result 
     pref = getApplicationContext().getSharedPreferences("CachedResponse", 0); 

     //Somewhere on Signout button click, delete the login sharedpreference 
     signOut(); 

    } 

    private void signOut() { 

     SharedPreferences.Editor editor = pref.edit(); 
     editor.remove("login"); 
     editor.apply(); 

     Intent intent = new Intent(Select_Collage.this, Login.class); 
     startActivity(intent); 
     finish(); 

    } 
} 

所以這就是你如何解決這個問題。保持編碼:)