comment implémenter SHARED PREFERENCE (java, sql base de données LOGIN)

Question

hey les gars, donc j'ai une activité de connexion qui vérifie nom d'utilisateur et mot de passe avec le serveur pour authentifier les utilisateurs. Je veux utiliser sharedpermissions pour stocker le nom d'utilisateur et le mot de passe afin que l'utilisateur ne se connecte pas à chaque fois. Je veux aussi créer un bouton de connexion. J'ai essayé de l'implémenter mais il saute juste l'acitivité de connexion et m'amène à ma deuxième activité. J'ai laissé certains codes de sharedpermission sous forme de commentaires (//)

Quelqu'un peut-il me montrer/me dire le mieux que je peux faire?

public class LoginActivity extends AppCompatActivity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_login); 


    //String username = ""; 
    //String password = ""; 
    //SharedPreferences pre; 


    final EditText etUsername = (EditText) findViewById(R.id.etUsername); 
    final EditText etPassword = (EditText) findViewById(R.id.etPassword); 
    final TextView tvRegisterLink = (TextView) findViewById(R.id.tvRegisterhere); 
    final Button bLogin = (Button) findViewById(R.id.bLogin); 

    if(TextUtils.isEmpty(etUsername.getText().toString())||TextUtils.isEmpty(etPassword.getText().toString())){ 
     Intent intent = new Intent(LoginActivity.this, UserAreaActivity.class); 
     LoginActivity.this.startActivity(intent); 
    } else { 
     Intent registerIntent = new Intent(LoginActivity.this, LoginActivity.class); 
     LoginActivity.this.startActivity(registerIntent); 
    } 




    final String username1 = SharedPreferenceUtils.getUsername(this); 
    final String password1 = SharedPreferenceUtils.getPassword(this); 

    // pre = getSharedPreferences("pref",MODE_PRIVATE); 
    //if(pre.getBoolean("username",true) && pre.getBoolean("password",true)){ 













    tvRegisterLink.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent registerIntent = new Intent(LoginActivity.this, RegisterActivity.class); 
      LoginActivity.this.startActivity(registerIntent); 
     } 
    }); 

    bLogin.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final String username = etUsername.getText().toString(); 
      final String password = etPassword.getText().toString(); 


      // Response received from the server 
      Response.Listener<String> responseListener = new Response.Listener<String>() { 
       @Override 
       public void onResponse(String response) { 
        try { 
         JSONObject jsonResponse = new JSONObject(response); 
         boolean success = jsonResponse.getBoolean("success"); 

         if (success) { 
          String name = jsonResponse.getString("name"); 
          SharedPreferenceUtils.createSP(LoginActivity.this,username1,password1); 





          Intent intent = new Intent(LoginActivity.this, UserAreaActivity.class); 
          intent.putExtra("name", name); 
          intent.putExtra("username", username); 

          LoginActivity.this.startActivity(intent); 


         } else { 
          AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this); 
          builder.setMessage("Login Failed") 
            .setNegativeButton("Retry", null) 
            .create() 
            .show(); 
         } 

        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 
       } 
      }; 

      LoginRequest loginRequest = new LoginRequest(username, password, responseListener); 
      RequestQueue queue = Volley.newRequestQueue(LoginActivity.this); 
      queue.add(loginRequest); 






     } 
    }); 


} 

}

public class UserAreaActivity extends AppCompatActivity { 

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


    final TextView etusername = (TextView) findViewById(R.id.textView2); 
    final TextView etwelcome = (TextView) findViewById(R.id.textView); 
    final ImageButton red = (ImageButton) findViewById(R.id.imageButton); 
    final ImageButton messages = (ImageButton) findViewById(R.id.imageButton2); 
    final ImageButton blue = (ImageButton) findViewById(R.id.imageButton3); 
    final ImageButton ping = (ImageButton) findViewById(R.id.imageButton4); 
    final TextView etuname = (TextView) findViewById(R.id.textView3); 
    final Button Logout = (Button) findViewById(R.id.logout); 

    //String Name = SharedPreferenceUtils.getName(this); 
    //etwelcome.setText(Name); 




    red.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent registerIntent = new Intent(UserAreaActivity.this, Report.class); 
      UserAreaActivity.this.startActivity(registerIntent); 

     } 
    }); 

    messages.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent registerIntent = new Intent(UserAreaActivity.this, Messages.class); 
      UserAreaActivity.this.startActivity(registerIntent); 


     } 
    }); 

    Logout.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      boolean isClear = SharedPreferenceUtils.clearSP(UserAreaActivity.this); 
      if(isClear){ 
       Intent registerIntent = new Intent(UserAreaActivity.this, LoginActivity.class); 
       UserAreaActivity.this.startActivity(registerIntent); 
      } 




     } 
    }); 

    Intent intent = getIntent(); 
    String name = intent.getStringExtra("name"); 
    String username = intent.getStringExtra("username"); 



    String message = "Welcome " + name; 
    etwelcome.setText(message); 
    etusername.setText(username); 








    //Intent in = new Intent(getApplicationContext(), Messages.class); 
    //in.putExtra("username", username); 
    //UserAreaActivity.this.startActivity(in); 

} 











} 

Answer 1

Vous pouvez utiliser SharedPreferences dans votre code.

Essayez ceci.

public class SharedPreferenceUtils { 

    private static final String SP_NAME = "sp"; 
    public static final String USERNAME = "username"; 
    public static final String PASSWORD = "password"; 


    // create 
    public static boolean createSP(Context context, String username, String password) { 
     SharedPreferences.Editor editor = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE).edit(); 
     editor.putString(USERNAME, username); 
     editor.putString(PASSWORD, password); 
     return editor.commit(); 
    } 

    // clear 
    public static boolean clearSP(Context context) { 
     SharedPreferences sharedPreferences = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); 
     SharedPreferences.Editor editor = sharedPreferences.edit(); 
     return editor.clear().commit(); 
    } 

    // get access info 
    public static String getUsername(Context context) { 
     SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); 
     return sp.getString(USERNAME, ""); 
    } 
    // get branch info 
    public static String getPassword(Context context) { 
     SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); 
     return sp.getString(PASSWORD, ""); 
    } 
} 

Utilisation dans LoginActivity

SharedPreferenceUtils.createSP(this,username,password); 

Et utiliser dans d'autres Activity

String username = SharedPreferenceUtils.getUsername(this); 
String password = SharedPreferenceUtils.getPassword(this); 

Modifier

if (success) { 
     String name = jsonResponse.getString("name"); 
     SharedPreferenceUtils.createSP(this, username, password); 
} 

Modifier

private EditText etUsername, etPassword; 

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

    etUsername = (EditText) findViewById(R.id.etUsername); 
    etPassword = (EditText) findViewById(R.id.etPassword); 

    String username = SharedPreferenceUtils.getUsername(this); 
    String password = SharedPreferenceUtils.getPassword(this); 
    etUsername.setText(username); 
    etPassword.setText(password); 
} 

Modifier

if(TextUtils.isEmpty(etUsername.getText().toString())||TextUtils.isEmpty(etPassword.getText().toString())){ 
     Intent intent = new Intent(LoginActivity.this, A.class); 
     LoginActivity.this.startActivity(intent); 
} else { 
     Intent registerIntent = new Intent(LoginActivity.this, B.class); 
     LoginActivity.this.startActivity(intent); 
} 

Modifier

boolean isClear = SharedPreferenceUtils.clearSP(UserAreaActivity.this); 
if(isClear){ 
     Intent registerIntent = new Intent(UserAreaActivity.this, LoginActivity.class); 
     UserAreaActivity.this.startActivity(registerIntent); 
}