Android登錄/共享偏好註冊

我是Android新手。我正在爲大學考試做一個應用程序。我必須爲旅行社申請。我想通過共享偏好來管理用戶會話，以便保存基本信息以及用戶預訂的最終旅行。我無法在網絡上找到結合註冊和登錄表單的示例。我寫了這段代碼，但它不起作用。它不顯示任何錯誤。我認爲我寫的不是邏輯。我想先註冊並登錄我在註冊表中提供的信息。感謝您的幫助。Android登錄/共享偏好註冊

這是我Login.java：

package com.example.trip; 

import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class Login extends ActionBarActivity { 

public static android.content.SharedPreferences SharedPreferences = null; 

private static final String PREFER_NAME = null; 

Button buttonLogin; 

EditText txtUsername, txtPassword; 

// User Session Manager Class 
UserSession session; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.login); 

    Button switchButton = (Button)findViewById(R.id.buttonReg); 
    switchButton.setOnClickListener (new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      Intent intent=new Intent(Login.this, Reg.class); 
      startActivity(intent); 

     } 
    }); 


    // User Session Manager 
    session = new UserSession(getApplicationContext());     

    // get Email, Password input text 
    txtUsername = (EditText) findViewById(R.id.txtUsername); 
    txtPassword = (EditText) findViewById(R.id.txtPassword); 

    Toast.makeText(getApplicationContext(), 
      "User Login Status: " + session.isUserLoggedIn(), 
      Toast.LENGTH_LONG).show(); 


    // User Login button 
    buttonLogin = (Button) findViewById(R.id.buttonLogin); 

    SharedPreferences = getSharedPreferences(PREFER_NAME, Context.MODE_PRIVATE); 


    // Login button click event 
    buttonLogin.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 

      // Get username, password from EditText 
      String username = txtUsername.getText().toString(); 
      String password = txtPassword.getText().toString(); 

      // Validate if username, password is filled    
      if(username.trim().length() > 0 && password.trim().length() > 0){ 

       if (SharedPreferences.contains("name")) 
        { 
        String uName = (SharedPreferences).getString("name", ""); 

        } 

        if (SharedPreferences.contains("email")) 
        { 
        String uEmail = (SharedPreferences).getString("email", ""); 

        } 

          Object uName = null; 
          Object uEmail = null; 
          if(username.equals(uName) && password.equals(uEmail)){ 

           session.createUserLoginSession(uName, 
            uEmail); 

           // Starting MainActivity 
           Intent i = new Intent(getApplicationContext(),MainActivity.class); 
           i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

           // Add new Flag to start new Activity 
           i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
           startActivity(i); 

           finish(); 

          }else{ 

           // username/password doesn't match& 
           Toast.makeText(getApplicationContext(), 
            "Username/Password is incorrect", 
             Toast.LENGTH_LONG).show(); 

          }    
         }else{ 

          // user didn't entered username or password 
          Toast.makeText(getApplicationContext(), 
           "Please enter username and password", 
             Toast.LENGTH_LONG).show(); 

         } 

        } 
       }); 
} 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = new MenuInflater(this); 
     inflater.inflate(R.menu.main, menu); 
     return true; 
    } 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 
     switch (id) { 
     case R.id.MENU_1: 
      Intent intent1 = new Intent(this, Login.class); 
      this.startActivity(intent1); 
      break; 
     case R.id.MENU_2: 
      Intent intent2 = new Intent(this, MainActivity.class); 
      this.startActivity(intent2); 
     break; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 

     return true; 
    }  
}

這是UserSession.java：

package com.example.trip; 

import java.util.HashMap; 

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 

public class UserSession { 
// Shared Preferences reference 
SharedPreferences pref; 

// Editor reference for Shared preferences 
Editor editor; 

// Context 
Context _context; 

// Shared preferences mode 
int PRIVATE_MODE = 0; 

// Shared preferences file name 
public static final String PREFER_NAME = "AndroidExamplePref"; 

// All Shared Preferences Keys 
public static final String IS_USER_LOGIN = "IsUserLoggedIn"; 

// User name (make variable public to access from outside) 
public static final String KEY_NAME = "name"; 

// Email address (make variable public to access from outside) 
public static final String KEY_EMAIL = "email"; 

// Constructor 
public UserSession(Context context){ 
    this._context = context; 
    pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE); 
    editor = pref.edit(); 
} 

//Create login session 
public void createUserLoginSession(Object uName, Object uEmail){ 
    // Storing login value as TRUE 
    editor.putBoolean(IS_USER_LOGIN, true); 

    // Storing name in preferences 
    editor.putString(KEY_NAME, (String) uName); 

    // Storing email in preferences 
    editor.putString(KEY_EMAIL, (String) uEmail); 

    // commit changes 
    editor.commit(); 
} 

/** 
* Check login method will check user login status 
* If false it will redirect user to login page 
* Else do anything 
* */ 
public boolean checkLogin(){ 
    // Check login status 
    if(!this.isUserLoggedIn()){ 

     // user is not logged in redirect him to Login Activity 
     Intent i = new Intent(_context, Login.class); 

     // Closing all the Activities from stack 
     i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

     // Add new Flag to start new Activity 
     i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 

     // Staring Login Activity 
     _context.startActivity(i); 

     return true; 
    } 
    return false; 
} 



/** 
* Get stored session data 
* */ 
public HashMap<String, String> getUserDetails(){ 

    //Use hashmap to store user credentials 
    HashMap<String, String> user = new HashMap<String, String>(); 

    // user name 
    user.put(KEY_NAME, pref.getString(KEY_NAME, null)); 

    // user email id 
    user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null)); 

    // return user 
    return user; 
} 

/** 
* Clear session details 
* */ 
public void logoutUser(){ 

    // Clearing all user data from Shared Preferences 
    editor.clear(); 
    editor.commit(); 

    // After logout redirect user to MainActivity 
    Intent i = new Intent(_context, MainActivity.class); 

    // Closing all the Activities 
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

    // Add new Flag to start new Activity 
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 

    // Staring Login Activity 
    _context.startActivity(i); 
} 


// Check for login 
public boolean isUserLoggedIn(){ 
    return pref.getBoolean(IS_USER_LOGIN, false); 
} 
}

這是MainActivity.java：

public class MainActivity extends ActionBarActivity { 

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

public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = new MenuInflater(this); 
    inflater.inflate(R.menu.main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
int id = item.getItemId(); 
    switch (id) { 
    case R.id.MENU_1: 
     Intent intent1 = new Intent(this, Login.class); 
     this.startActivity(intent1); 
     break; 
    case R.id.MENU_2: 
     Intent intent2 = new Intent(this, MainActivity.class); 
     this.startActivity(intent2); 
    break; 
    default: 
     return super.onOptionsItemSelected(item); 
    } 

    return true; 
} 
}

這是我的註冊.java：

package com.example.trip; 

import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 
import android.view.View.OnClickListener; 

public class Reg extends ActionBarActivity { 

SharedPreferences SharedPreferences; 
Editor editor; 
Button buttonReg2; 
EditText txtUsername, txtPassword, txtEmail; 
UserSession session; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.reg); 

txtUsername = (EditText) findViewById(R.id.Name); 
txtPassword = (EditText) findViewById(R.id.txtPassword); 
txtEmail = (EditText) findViewById(R.id.Email); 
buttonReg2 = (Button) findViewById(R.id.buttonReg2); 

// creating an shared Preference file for the information to be stored 
// first argument is the name of file and second is the mode, 0 is private mode 

SharedPreferences = getSharedPreferences("Reg", 0); 
// get editor to edit in file 
editor = SharedPreferences.edit(); 

buttonReg2.setOnClickListener(new View.OnClickListener() { 

    public void onClick (View v) { 
    String name = txtUsername.getText().toString(); 
    String email = txtEmail.getText().toString(); 
    String pass = txtPassword.getText().toString(); 

    if(txtUsername.getText().length()<=0){ 
     Toast.makeText(Reg.this, "Enter name", Toast.LENGTH_SHORT).show(); 
    } 
    else if(txtEmail.getText().length()<=0){ 
     Toast.makeText(Reg.this, "Enter email", Toast.LENGTH_SHORT).show(); 
    } 
    else if(txtPassword.getText().length()<=0){ 
     Toast.makeText(Reg.this, "Enter password", Toast.LENGTH_SHORT).show(); 
    } 
    else{ 

    // as now we have information in string. Lets stored them with the help of editor 
    editor.putString("Name", name); 
    editor.putString("Email",email); 
    editor.putString("txtPassword",pass); 
    editor.commit();} // commit the values 

    // after saving the value open next activity 
    Intent ob = new Intent(Reg.this, Login.class); 
    startActivity(ob); 

    } 
}); 
} 

    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = new MenuInflater(this); 
     inflater.inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 
     switch (id) { 
     case R.id.MENU_1: 
      Intent intent1 = new Intent(this, Login.class); 
      this.startActivity(intent1); 
      break; 
     case R.id.MENU_2: 
      Intent intent2 = new Intent(this, MainActivity.class); 
      this.startActivity(intent2); 
     break; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 

     return true; 
    } 
}

在MainActivity的XML代碼：

<?xml version="1.0" encoding="utf-8"?> 
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:gravity="top" 
    android:shrinkColumns="0" 
    android:stretchColumns="1" > 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/destinazione" /> 

     <EditText 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="text" /> 
    </TableRow> 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/checkin" /> 

     <EditText 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="date" /> 
    </TableRow> 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/checkout" /> 

     <EditText 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="date" /> 
    </TableRow> 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/viaggiatori" /> 

     <EditText 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="number" /> 
    </TableRow> 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/stelle" /> 

     <Spinner 
      android:id="@+id/spinner" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:entries="@array/stelle"/> 
    </TableRow> 

    <Button 
     android:id="@+id/buttonFind" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/buttonFind" /> 

    </TableLayout>

登錄表單的XML代碼：

<?xml version="1.0" encoding="utf-8"?> 
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:gravity="top" 
android:shrinkColumns="0" 
android:stretchColumns="1" > 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/txtUsername" /> 

     <EditText 
      android:id="@+id/txtUsername" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="text" /> 
    </TableRow> 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/txtPassword" /> 

     <EditText 
      android:id="@+id/txtPassword" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="textPassword" /> 
    </TableRow> 

    <Button 
     android:id="@+id/buttonLogin" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/buttonLogin" /> 

    <Button 
     android:id="@+id/buttonReg" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/buttonReg" /> 

</TableLayout>

這是爲登記表中的XML代碼：

<?xml version="1.0" encoding="utf-8"?> 
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:gravity="top" 
android:shrinkColumns="0" 
android:stretchColumns="1" > 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/Name" /> 

     <EditText 
      android:id="@+id/Name" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="text" /> 
    </TableRow> 

    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/Email" /> 

     <EditText 
      android:id="@+id/Email" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="textEmailAddress" /> 
    </TableRow> 


    <TableRow 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="fill_horizontal|center_vertical" > 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="fill_horizontal|center_vertical" 
      android:text="@string/txtPassword" /> 

     <EditText 
      android:id="@+id/txtPassword" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:inputType="textPassword" /> 
    </TableRow> 

    <Button 
     android:id="@+id/buttonReg2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/buttonReg2" /> 

</TableLayout>

來源

2014-11-04 Sonia

您的應用程序連接到服務器？ – Arshak92 2014-11-04 16:37:34

不，如果可能的話，我更喜歡沒有服務器。 – Sonia 2014-11-04 17:21:39

如果你想在沒有服務器端進行註冊，我不認爲你提供的代碼示例有任何問題。 – Arshak92 2014-11-04 17:23:51

這是工作代碼，試試吧。

MainActivity.java

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 

public class MainActivity extends ActionBarActivity { 

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

public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = new MenuInflater(this); 
    inflater.inflate(R.menu.main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
int id = item.getItemId(); 
    switch (id) { 
    case R.id.menu1: 
     Intent intent1 = new Intent(this, Login.class); 
     this.startActivity(intent1); 
     break; 
    case R.id.menu2: 
     Intent intent2 = new Intent(this, MainActivity.class); 
     this.startActivity(intent2); 
    break; 
    default: 
     return super.onOptionsItemSelected(item); 
    } 

    return true; 
} 
}

Reg.java

import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class Reg extends ActionBarActivity { 

SharedPreferences sharedPreferences; 
Editor editor; 
Button buttonReg2; 
EditText txtUsername, txtPassword, txtEmail; 
UserSession session; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.reg); 

txtUsername = (EditText) findViewById(R.id.Name); 
txtPassword = (EditText) findViewById(R.id.txtPassword); 
txtEmail = (EditText) findViewById(R.id.Email); 
buttonReg2 = (Button) findViewById(R.id.buttonReg2); 

// creating an shared Preference file for the information to be stored 
// first argument is the name of file and second is the mode, 0 is private mode 

sharedPreferences = getApplicationContext().getSharedPreferences("Reg", 0); 
// get editor to edit in file 
editor = sharedPreferences.edit(); 

buttonReg2.setOnClickListener(new View.OnClickListener() { 

    public void onClick (View v) { 
    String name = txtUsername.getText().toString(); 
    String email = txtEmail.getText().toString(); 
    String pass = txtPassword.getText().toString(); 

    if(txtUsername.getText().length()<=0){ 
     Toast.makeText(Reg.this, "Enter name", Toast.LENGTH_SHORT).show(); 
    } 
    else if(txtEmail.getText().length()<=0){ 
     Toast.makeText(Reg.this, "Enter email", Toast.LENGTH_SHORT).show(); 
    } 
    else if(txtPassword.getText().length()<=0){ 
     Toast.makeText(Reg.this, "Enter password", Toast.LENGTH_SHORT).show(); 
    } 
    else{ 

    // as now we have information in string. Lets stored them with the help of editor 
    editor.putString("Name", name); 
    editor.putString("Email",email); 
    editor.putString("txtPassword",pass); 
    editor.commit();} // commit the values 

    // after saving the value open next activity 
    Intent ob = new Intent(Reg.this, Login.class); 
    startActivity(ob); 

    } 
}); 
} 

    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = new MenuInflater(this); 
     inflater.inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 
     switch (id) { 
     case R.id.menu1: 
      Intent intent1 = new Intent(this, Login.class); 
      this.startActivity(intent1); 
      break; 
     case R.id.menu2: 
      Intent intent2 = new Intent(this, MainActivity.class); 
      this.startActivity(intent2); 
     break; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 

     return true; 
    } 
}

Login.java

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class Login extends ActionBarActivity { 

//public static android.content.SharedPreferences SharedPreferences = null; 

private static final String PREFER_NAME = "Reg"; 

Button buttonLogin; 

EditText txtUsername, txtPassword; 

// User Session Manager Class 
UserSession session; 

private SharedPreferences sharedPreferences; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.login); 

    Button switchButton = (Button)findViewById(R.id.buttonReg); 
    switchButton.setOnClickListener (new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      Intent intent=new Intent(Login.this, Reg.class); 
      startActivity(intent); 

     } 
    }); 


    // User Session Manager 
    session = new UserSession(getApplicationContext());     

    // get Email, Password input text 
    txtUsername = (EditText) findViewById(R.id.txtUsername); 
    txtPassword = (EditText) findViewById(R.id.txtPassword); 

    Toast.makeText(getApplicationContext(), 
      "User Login Status: " + session.isUserLoggedIn(), 
      Toast.LENGTH_LONG).show(); 


    // User Login button 
    buttonLogin = (Button) findViewById(R.id.buttonLogin); 

    sharedPreferences = getSharedPreferences(PREFER_NAME, Context.MODE_PRIVATE); 


    // Login button click event 
    buttonLogin.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 

      // Get username, password from EditText 
      String username = txtUsername.getText().toString(); 
      String password = txtPassword.getText().toString(); 

      // Validate if username, password is filled    
      if(username.trim().length() > 0 && password.trim().length() > 0){ 
        String uName = null; 
        String uPassword =null; 

       if (sharedPreferences.contains("Name")) 
        { 
        uName = sharedPreferences.getString("Name", ""); 

        } 

        if (sharedPreferences.contains("txtPassword")) 
        { 
        uPassword = sharedPreferences.getString("txtPassword", ""); 

        } 

          // Object uName = null; 
          // Object uEmail = null; 
          if(username.equals(uName) && password.equals(uPassword)){ 

           session.createUserLoginSession(uName, 
            uPassword); 

           // Starting MainActivity 
           Intent i = new Intent(getApplicationContext(),MainActivity.class); 
           i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

           // Add new Flag to start new Activity 
           i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
           startActivity(i); 

           finish(); 

          }else{ 

           // username/password doesn't match& 
           Toast.makeText(getApplicationContext(), 
            "Username/Password is incorrect", 
             Toast.LENGTH_LONG).show(); 

          }    
         }else{ 

          // user didn't entered username or password 
          Toast.makeText(getApplicationContext(), 
           "Please enter username and password", 
             Toast.LENGTH_LONG).show(); 

         } 

        } 
       }); 
} 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = new MenuInflater(this); 
     inflater.inflate(R.menu.main, menu); 
     return true; 
    } 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 
     switch (id) { 
     case R.id.menu1: 
      Intent intent1 = new Intent(this, Login.class); 
      this.startActivity(intent1); 
      break; 
     case R.id.menu2: 
      Intent intent2 = new Intent(this, MainActivity.class); 
      this.startActivity(intent2); 
     break; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 

     return true; 
    }  
}

UserSession.java

package com.example.tripmanager; 

import java.util.HashMap; 

import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 

public class UserSession { 
// Shared Preferences reference 
SharedPreferences pref; 

// Editor reference for Shared preferences 
Editor editor; 

// Context 
Context _context; 

// Shared preferences mode 
int PRIVATE_MODE = 0; 

// Shared preferences file name 
public static final String PREFER_NAME = "Reg"; 

// All Shared Preferences Keys 
public static final String IS_USER_LOGIN = "IsUserLoggedIn"; 

// User name (make variable public to access from outside) 
public static final String KEY_NAME = "Name"; 

// Email address (make variable public to access from outside) 
public static final String KEY_EMAIL = "Email"; 

// password 
public static final String KEY_PASSWORD = "txtPassword"; 

// Constructor 
public UserSession(Context context){ 
    this._context = context; 
    pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE); 
    editor = pref.edit(); 
} 

//Create login session 
public void createUserLoginSession(String uName, String uPassword){ 
    // Storing login value as TRUE 
    editor.putBoolean(IS_USER_LOGIN, true); 

    // Storing name in preferences 
    editor.putString(KEY_NAME, uName); 

    // Storing email in preferences 
    editor.putString(KEY_EMAIL, uPassword); 

    // commit changes 
    editor.commit(); 
} 

/** 
* Check login method will check user login status 
* If false it will redirect user to login page 
* Else do anything 
* */ 
public boolean checkLogin(){ 
    // Check login status 
    if(!this.isUserLoggedIn()){ 

     // user is not logged in redirect him to Login Activity 
     Intent i = new Intent(_context, Login.class); 

     // Closing all the Activities from stack 
     i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

     // Add new Flag to start new Activity 
     i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 

     // Staring Login Activity 
     _context.startActivity(i); 

     return true; 
    } 
    return false; 
} 



/** 
* Get stored session data 
* */ 
public HashMap<String, String> getUserDetails(){ 

    //Use hashmap to store user credentials 
    HashMap<String, String> user = new HashMap<String, String>(); 

    // user name 
    user.put(KEY_NAME, pref.getString(KEY_NAME, null)); 

    // user email id 
    user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null)); 

    // return user 
    return user; 
} 

/** 
* Clear session details 
* */ 
public void logoutUser(){ 

    // Clearing all user data from Shared Preferences 
    editor.clear(); 
    editor.commit(); 

    // After logout redirect user to MainActivity 
    Intent i = new Intent(_context, MainActivity.class); 

    // Closing all the Activities 
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

    // Add new Flag to start new Activity 
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 

    // Staring Login Activity 
    _context.startActivity(i); 
} 


// Check for login 
public boolean isUserLoggedIn(){ 
    return pref.getBoolean(IS_USER_LOGIN, false); 
} 
}

來源

2014-11-04 18:00:35

我編輯了我所做的問題。我做了你寫給我的更改，但仍然無法正常工作。 – Sonia 2014-11-06 09:57:56

仍然無法正常工作。當我觸摸按鈕「註冊我」時，什麼都沒有發生！ – Sonia 2014-11-06 10:17:42

這段代碼在我的項目中工作，一定要試穿一下

使用此代碼登錄驗證存儲登錄值後

String Username = textInputEditTextEmail.getText().toString(); 
     String Password = textInputEditTextPassword.getText().toString(); 
     final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this); 
     SharedPreferences.Editor editor = sharedPref.edit(); 
     editor.putBoolean("Registered", true); 
     editor.putString("Username", Username); 
     editor.putString("Password", Password); 
     editor.apply();

創建新的空活動並複製此代碼

Boolean Registered; 
    final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this); 
    Registered = sharedPref.getBoolean("Registered", false); 

    if (!Registered) 
    { 
     startActivity(new Intent(this,Splash.class)); 
    }else { 
     startActivity(new Intent(this,MainActivity.class)); 
    }

在Menifest文件中複製inten在初始訪問的新創建的空文件中過濾代碼。

對於註銷，創建任何按鈕，點擊複製此代碼監聽

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.this); 
     SharedPreferences.Editor editor = preferences.edit(); 
     editor.clear(); 
     editor.commit(); 
     Intent i = new Intent(MainActivity.this,Login.class); 
     startActivity(i);

來源

2017-07-11 06:05:04

Android登錄/共享偏好註冊

回答

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