無法讀取來自CursorWindow的行

Question

我在做一個Android應用程序，我想在其中添加一個新用戶來實現註冊功能。

起初，我創建了一個稱爲註冊的活動，並且當按下按鈕，它調用添加用戶的方法：

public User createUser(String username, String password, String email) { 
      ContentValues values = new ContentValues(); 
      values.put(MySQLiteHelperUsers.COLUMN_USERNAME, username); 
      values.put(MySQLiteHelperUsers.COLUMN_PASSWORD, password); 
      values.put(MySQLiteHelperUsers.COLUMN_EMAIL, email); 
      long insertId = database.insert(MySQLiteHelperUsers.TABLE_USERS, null, 
       values); 
      Cursor cursor = database.query(MySQLiteHelperUsers.TABLE_USERS, 
       allColumns, MySQLiteHelperUsers.COLUMN_ID + " = " + insertId, null, 
       null, null, null); 
      cursor.moveToFirst(); 
      User newUser = cursorToUser(cursor); 
      cursor.close(); 
      return newUser; 
} 

這裏是cursorToUser方法：

private User cursorToUser(Cursor cursor) { 
     User user = new User(); 
     user.setId(cursor.getLong(cursor.getColumnIndex("_id"))); 
     user.setUsername(cursor.getString(cursor.getColumnIndex("_username"))); 
     user.setPassword(cursor.getString(cursor.getColumnIndex("_password"))); 
     user.setEmail(cursor.getString(cursor.getColumnIndex("_email"))); 
     return user; 
} 

但它給了我這個錯誤：

05-10 13:09:35.081: E/AndroidRuntime(16380): FATAL EXCEPTION: main 
05-10 13:09:35.081: E/AndroidRuntime(16380): java.lang.IllegalStateException: Could not execute method of the activity 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.view.View$1.onClick(View.java:3704) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.view.View.performClick(View.java:4232) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.view.View$PerformClick.run(View.java:17298) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.os.Handler.handleCallback(Handler.java:615) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.os.Handler.dispatchMessage(Handler.java:92) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.os.Looper.loop(Looper.java:137) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.app.ActivityThread.main(ActivityThread.java:4921) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at java.lang.reflect.Method.invokeNative(Native Method) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at java.lang.reflect.Method.invoke(Method.java:511) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at dalvik.system.NativeStart.main(Native Method) 
05-10 13:09:35.081: E/AndroidRuntime(16380): Caused by: java.lang.reflect.InvocationTargetException 
05-10 13:09:35.081: E/AndroidRuntime(16380): at java.lang.reflect.Method.invokeNative(Native Method) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at java.lang.reflect.Method.invoke(Method.java:511) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.view.View$1.onClick(View.java:3699) 
05-10 13:09:35.081: E/AndroidRuntime(16380): ... 11 more 
05-10 13:09:35.081: E/AndroidRuntime(16380): Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.database.CursorWindow.nativeGetLong(Native Method) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.database.CursorWindow.getLong(CursorWindow.java:511) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at android.database.AbstractWindowedCursor.getLong(AbstractWindowedCursor.java:75) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at dao.UsersDataSource.cursorToUser(UsersDataSource.java:75) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at dao.UsersDataSource.createUser(UsersDataSource.java:44) 
05-10 13:09:35.081: E/AndroidRuntime(16380): at com.example.pocket_city.Registration.registrationClick(Registration.java:47) 
05-10 13:09:35.081: E/AndroidRuntime(16380): ... 14 more 
05-10 13:09:35.141: D/dalvikvm(16380): GC_CONCURRENT freed 177K, 14% free 9641K/11143K, paused 15ms+4ms, total 79ms 

這裏是MySQLiteHelperUsers類：

public class MySQLiteHelperUsers extends SQLiteOpenHelper{ 
    public static final String TABLE_USERS = "users"; 
    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_EMAIL = "_email"; 

    private static final String DATABASE_NAME = "users.db"; 
    private static final int DATABASE_VERSION = 1; 

    // Database creation sql statement 
    private static final String DATABASE_CREATE = "CREATE TABLE " 
      + TABLE_USERS.trim() + "(" 
      + COLUMN_ID.trim() + " INTEGER PRIMARY KEY AUTOINCREMENT, " 
      + COLUMN_USERNAME.trim() + " TEXT NOT NULL, " 
      + COLUMN_PASSWORD.trim() + " TEXT NOT NULL, " 
      + COLUMN_EMAIL.trim() 
      + " TEXT NOT NULL)"; 

    public MySQLiteHelperUsers(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase database) { 
     database.execSQL(DATABASE_CREATE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_USERS); 
     onCreate(db); 
    } 

註冊活動：

public class Registration extends Activity { 
     UsersDataSource usersDataSource = null; 
     User user = null; 

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


      usersDataSource = new UsersDataSource(getApplicationContext()); 
      usersDataSource.open(); 
     } 


     public void registrationClick(View view){ 
      EditText editUsername = (EditText) findViewById(R.id.editUsername); 
       String username = editUsername.getText().toString(); 
      EditText editPassw = (EditText) findViewById(R.id.editPassw); 
       String passw = editPassw.getText().toString(); 
      EditText editPassw2 = (EditText) findViewById(R.id.editPassw2); 
       String passw2 = editPassw2.getText().toString(); 
      EditText editEmail = (EditText) findViewById(R.id.editEmail); 
       String email = editEmail.getText().toString(); 
      EditText editEmail2 = (EditText) findViewById(R.id.editEmail2); 
       String email2 = editEmail2.getText().toString(); 
      System.out.println("PASSW= "+passw+" "+passw2); 
      System.out.println("EMAIL= "+email+" "+email2); 

      /*if(!passw.equals(passw2) && !email.equals(email2)){ 
       Toast.makeText(getApplicationContext(), "Le password/email non sono uguali!", Toast.LENGTH_LONG).show(); 
      }*/ 

      usersDataSource.createUser(username, passw, email); 
      /*Toast.makeText(getApplicationContext(), "Registrazione riuscita!", Toast.LENGTH_LONG).show();*/  


     }  
} 

Answer 1

這似乎是一個或多個你試圖讓缺少光標列。

檢查，當你創建allColumns它包括所有列：

String[] allColumns = {"_id", "_username", "_password", "_email"};