如何驗證註冊頁面的android

Question

編輯：例如，如果我只是這樣做：

  boolean thiscreateserror = false; 
      if (thiscreateserror == true) { 
       mListener.register(userName, password); 
      } 
      else{} 

07-25 20:24:25.552 2385-2529/com.example.hoofdgebruiker.winkelskortrijk W/System: ClassLoader referenced unknown path: /data/data/com.example.hoofdgebruiker.winkelskortrijk/lib 
07-25 20:24:25.574 2385-2555/com.example.hoofdgebruiker.winkelskortrijk E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb4017ef0 
07-25 20:24:27.559 2385-2555/com.example.hoofdgebruiker.winkelskortrijk E/Surface: getSlotFromBufferLocked: unknown buffer: 0xaa1e6d10 

EDIT2：我很抱歉。每次我嘗試在註冊後重新啓動應用程序時，我似乎都會收到此錯誤。也許問題在別的地方？

我的數據庫：

public class MyDBHandler extends SQLiteOpenHelper { 

private static final int DATABASE_VERSION = 1; 
private static final String DATABASE_NAME = "winkelskortrijk.db"; 
private static final String TABLE_USERS = "users"; 
private static final String TABLE_FAVOURITES = "favorieten"; 

public static final String COLUMN_ID = "id"; 
public static final String COLUMN_USERNAME = "username"; 
public static final String COLUMN_PASSWORD = "password"; 

public static final String COLUMN_ID2 = "id2"; 
public static final String COLUMN_NAME = "naam"; 
public static final String COLUMN_STRAAT = "straat"; 
public static final String COLUMN_HUISNR = "nr"; 
public static final String COLUMN_POSTCODE = "postcode"; 
public static final String COLUMN_DEELGEMEENTE = "deelgemeente"; 
public static final String COLUMN_GEMEENTE = "gemeente"; 
public static final String COLUMN_ADRES = "adres"; 

public MyDBHandler(Context context, String name, 
        SQLiteDatabase.CursorFactory factory, int version) { 
    super(context, DATABASE_NAME, factory, DATABASE_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 

    String CREATE_USERS_TABLE = "CREATE TABLE " + 
      TABLE_USERS + "(" 
      + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," 
      + COLUMN_USERNAME + " TEXT," 
      + COLUMN_PASSWORD + " TEXT" 
      + ")"; 
    db.execSQL(CREATE_USERS_TABLE); 

    String CREATE_FAVOURITES_TABLE = "CREATE TABLE " + 
      TABLE_FAVOURITES + "(" 
      + COLUMN_ID2 + " INTEGER PRIMARY KEY," 
      + COLUMN_NAME + " TEXT," 
      + COLUMN_STRAAT + " TEXT," 
      + COLUMN_HUISNR + " INTEGER," 
      + COLUMN_POSTCODE + " INTEGER," 
      + COLUMN_DEELGEMEENTE + " TEXT," 
      + COLUMN_GEMEENTE + " TEXT," 
      + COLUMN_ADRES + " TEXT," 
      + COLUMN_ID + " INT, " 
      + "FOREIGN KEY(" + COLUMN_ID + ") REFERENCES " 
      + TABLE_USERS + "(id) " + ")"; 
    db.execSQL(CREATE_FAVOURITES_TABLE); 

} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, 
         int newVersion) { 

} 


public User findUser(User user) { 

    String selectQuery = "SELECT * FROM " + TABLE_USERS + " WHERE " 
      + COLUMN_USERNAME + " = '" + user.getUserName()+"'"; 

    SQLiteDatabase db = this.getWritableDatabase(); 

    Cursor cursor = db.rawQuery(selectQuery, null); 

    User findUser = new User(); 

    if (cursor.moveToFirst()) { 
     cursor.moveToFirst(); 
     findUser.setUserName(cursor.getString(1)); 
     findUser.setPassword(cursor.getString(2)); 
     cursor.close(); 
    } else { 
     findUser = null; 
    } 
    db.close(); 
    return findUser; 

} 

public void addOrUpdateUser(User user){ 

    ContentValues values = new ContentValues(); 
    values.put(COLUMN_USERNAME, user.getUserName()); 
    values.put(COLUMN_PASSWORD, user.getPassword()); 
    SQLiteDatabase db = this.getWritableDatabase(); 

    db.insert(TABLE_USERS, null, values); 
    db.close(); 
} 

我的主要活動：

@Override 
public void register(String userName, String password){ 
    User userNew = new User(); 
    User user = new User(); 
    userNew.setUserName(userName); 
    userNew.setPassword(password); 
    MyDBHandler dbHandler = new MyDBHandler(this,null,null,1); 
    user = dbHandler.findUser(userNew); 
    if (user == null){ 
     dbHandler.addOrUpdateUser(userNew); 
     navigateToLogin(); 
    } 
    else{ 
     navigateToRegister(); 
    } 
} 

} 

Answer 1

更改您的代碼是這樣的：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

    View view = inflater.inflate(R.layout.fragment_register, container, false); 
    Button btnRegister = (Button) view.findViewById(R.id.actionregister); 
    final EditText nameText = (EditText) view.findViewById(R.id.rusername); 
    final EditText passText = (EditText) view.findViewById(R.id.rpassword); 
    final EditText passConText = (EditText) view.findViewById(R.id.rpasswordr); 

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

      if(validate(nameText, passText, passConText)) 
       mListener.register(userName, password); 
     } 

    }); 
    return view; 
} 

private boolean validate(EditText nameText, EditText passText, EditText passConText) { 


     String userName = nameText.getText().toString(); 
     String password = passText.getText().toString(); 
     String passCon = passConText.getText().toString(); 
    boolean isValidated = true; 
    if(userName.trim().length() == 0){ 
     nameText.setError("Username has to be entered"); 
     isValidated = false; 
    } 
    if(password.trim().length() == 0) 
    { 
     passText.setError("Password has to be entered"); 
     isValidated = false; 
    } 
    else { 
    if(!pass.equals(passCon)){ 
      passText.setError("Passwords have to be matching"); 
      isValidated = false; 
    } 
return isValidated; 

} 

注意：請nameText，passText實例變量，因此是可訪問的 裏面的函數。

Answer 2

當你寫if(password != passCon) 你比較基準，而不是字符串值。 嘗試使用if(!passCon.equals(password))來代替。