ListView控件使用SimpleCursorAdapter獲取ID錯誤

Question

這是我的SQLite表

我想用onItemClick獲得ID。 這是我的代碼：

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {        
     // TODO Auto-generated method stub 

     int id_To_Search = (int)arg3; 
     //Toast.makeText(getActivity(), arg0.getItemAtPosition(arg2).getLong(0), Toast.LENGTH_LONG).show(); 
     Toast.makeText(getActivity(), "ID: " + arg3 , Toast.LENGTH_LONG).show(); 


     Bundle dataBundle = new Bundle(); 
     dataBundle.putInt("id", id_To_Search); 

     Intent intent = new Intent(getActivity().getApplicationContext(),DisplayContact1.class); 

     intent.putExtras(dataBundle); 
     startActivity(intent); 
} 

但onItemClick正在通過數據庫行「名稱」。 幫我嗎？

這是我的DBHelper

public class DBHelper extends SQLiteOpenHelper { 

public static final String DATABASE_NAME = "MyDBName.db"; 
public static final String CONTACTS_TABLE_NAME = "contacts"; 
public static final String CONTACTS_COLUMN_NAME = "name"; 
public static final String CONTACTS_COLUMN_EMAIL = "email"; 
public static final String CONTACTS_COLUMN_STREET = "street"; 
public static final String CONTACTS_COLUMN_CITY = "place"; 
public static final String CONTACTS_COLUMN_PHONE = "phone"; 
public static final String CONTACTS_COLUMN_INCOME = "income"; 
public static final String CONTACTS_COLUMN_LEGEND = "legend"; 
public static final String CONTACTS_COLUMN_DATE = "date"; 



private HashMap hp; 
SQLiteDatabase db = null; 



public DBHelper(Context context) { 
    super(context, DATABASE_NAME , null, 1); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    // TODO Auto-generated method stub 
    db.execSQL(
      "create table contacts " + "(_id integer primary key, name text,phone text,email text, street text,place text)" 
    ); 
    db.execSQL("create table contacts2 " + "(id integer primary key,income text, legend text, date text)"); 


} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    // TODO Auto-generated method stub 
    db.execSQL("DROP TABLE IF EXISTS contacts"); 
    db.execSQL("DROP TABLE IF EXISTS contacts2"); 
    onCreate(db); 
} 

public Cursor select() 
{ 
    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor cursor = db.query("contacts", null, null, null, null, null, null); 
    return cursor; 
} 

public Cursor select2() 
{ 
    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor cursor = db.query("contacts2", null, null, null, null, null, null); 
    return cursor; 
} 


public boolean insertContact (String name, String phone, String email, String street,String place) { 
    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues contentValues = new ContentValues(); 
    contentValues.put("name", name); 
    contentValues.put("phone", phone); 
    contentValues.put("email", email); 
    contentValues.put("street", street); 
    contentValues.put("place", place); 
    db.insert("contacts", null, contentValues); 
    return true; 
} 

public boolean insertContact2 (String income, String legend, String date) { 
    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues contentValues = new ContentValues(); 
    contentValues.put("income", income); 
    contentValues.put("legend", legend); 
    contentValues.put("date", date); 
    db.insert("contacts2", null, contentValues); 
    return true; 
} 

public Cursor getData(int id) { 
    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from contacts where id="+id+"", null); 
    return res; 
} 

public Cursor getData2(int id) { 
    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from contacts2 where id="+id+"", null); 
    return res; 
} 




public int numberOfRows(){ 
    SQLiteDatabase db = this.getReadableDatabase(); 
    int numRows = (int) DatabaseUtils.queryNumEntries(db, CONTACTS_TABLE_NAME); 
    return numRows; 
} 



public boolean updateContact (Integer id, String name, String phone, String email, String street,String place) { 
    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues contentValues = new ContentValues(); 
    contentValues.put("name", name); 
    contentValues.put("phone", phone); 
    contentValues.put("email", email); 
    contentValues.put("street", street); 
    contentValues.put("place", place); 
    db.update("contacts", contentValues, "id = ? ", new String[] { Integer.toString(id) }); 
    return true; 
} 

public boolean updateContact2 (Integer id, String income, String legend, String date) { 
    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues contentValues = new ContentValues(); 
    contentValues.put("income", income); 
    contentValues.put("legend", legend); 
    contentValues.put("date", date); 
    db.update("contacts2", contentValues, "id = ? ", new String[] { Integer.toString(id) }); 
    return true; 
} 

public Integer deleteContact (Integer id) { 
    SQLiteDatabase db = this.getWritableDatabase(); 
    return db.delete("contacts", "id = ? ", new String[] { Integer.toString(id) }); 

} 

public Integer deleteContact2 (Integer id) { 
    SQLiteDatabase db = this.getWritableDatabase(); 
    return db.delete("contacts2", "id = ? ", new String[] { Integer.toString(id) }); 

} 

public ArrayList<String> getAllCotacts() { 
    ArrayList<String> array_list = new ArrayList<String>(); 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from contacts", null); 
    res.moveToFirst(); 

    while(res.isAfterLast() == false){ 
     array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME))); 
     res.moveToNext(); 
    } 
    return array_list; 
} 

public ArrayList<Float> getFloat() { 
    ArrayList<Float> array_list = new ArrayList<Float>(); 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from contacts", null); 
    res.moveToFirst(); 

    while(res.isAfterLast() == false){ 
     array_list.add(res.getFloat(res.getColumnIndex(CONTACTS_COLUMN_NAME))); 
     res.moveToNext(); 
    } 
    return array_list; 
} 

public ArrayList<String> getItem() { 
    ArrayList<String> array_list = new ArrayList<String>(); 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from contacts", null); 
    res.moveToFirst(); 

    while(res.isAfterLast() == false){ 
     array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_PHONE))); 
     res.moveToNext(); 
    } 
    return array_list; 
} 

public ArrayList<String> getAllCotacts2() { 
    ArrayList<String> array_list = new ArrayList<String>(); 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from contacts2", null); 
    res.moveToFirst(); 

    while(res.isAfterLast() == false){ 
     array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_INCOME))); 
     res.moveToNext(); 
    } 
    return array_list; 
} 

}

我該怎麼辦獲得ID？

ps。我用cursor.getString(cursor.getColumnIndex("id")但錯誤是： Couldn't read row 2, col -1 from CursorWindow.

Answer 1

1.在你DBHelper onCreate()方法，看來你已經創建的表contacts與first列名_id和你的其他方法，比如getdate(), deleteContact(), updateContact()，您使用的first列如id。

2.您正在使用cursor.getString(cursor.getColumnIndex("id")其中id是INTEGER值。您應該使用cursor.getInt(cursor.getColumnIndex("id")

更新您的DBHelper如下類：

public class DBHelper extends SQLiteOpenHelper { 

    public static final String DATABASE_NAME = "MyDBName.db"; 
    public static final String CONTACTS_TABLE_NAME = "contacts"; 
    public static final String CONTACTS_COLUMN_NAME = "name"; 
    public static final String CONTACTS_COLUMN_EMAIL = "email"; 
    public static final String CONTACTS_COLUMN_STREET = "street"; 
    public static final String CONTACTS_COLUMN_CITY = "place"; 
    public static final String CONTACTS_COLUMN_PHONE = "phone"; 
    public static final String CONTACTS_COLUMN_INCOME = "income"; 
    public static final String CONTACTS_COLUMN_LEGEND = "legend"; 
    public static final String CONTACTS_COLUMN_DATE = "date"; 


    private HashMap hp; 
    SQLiteDatabase db = null; 

    public DBHelper(Context context) { 
     super(context, DATABASE_NAME, null, 1); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     // TODO Auto-generated method stub 
     db.execSQL("create table contacts " + "(id integer primary key, name text, phone text, email text, street text, place text)"); 
     db.execSQL("create table contacts2 " + "(id integer primary key, income text, legend text, date text)"); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // TODO Auto-generated method stub 
     db.execSQL("DROP TABLE IF EXISTS contacts"); 
     db.execSQL("DROP TABLE IF EXISTS contacts2"); 
     onCreate(db); 
    } 

    public Cursor select() { 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor cursor = db.query("contacts", null, null, null, null, null, null); 
     return cursor; 
    } 

    public Cursor select2() { 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor cursor = db.query("contacts2", null, null, null, null, null, null); 
     return cursor; 
    } 


    public boolean insertContact(String name, String phone, String email, String street, String place) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(CONTACTS_COLUMN_NAME, name); 
     contentValues.put(CONTACTS_COLUMN_PHONE, phone); 
     contentValues.put(CONTACTS_COLUMN_EMAIL, email); 
     contentValues.put(CONTACTS_COLUMN_STREET, street); 
     contentValues.put(CONTACTS_COLUMN_CITY, place); 

     db.insert("contacts", null, contentValues); 

     return true; 
    } 

    public boolean insertContact2(String income, String legend, String date) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(CONTACTS_COLUMN_INCOME, income); 
     contentValues.put(CONTACTS_COLUMN_LEGEND, legend); 
     contentValues.put(CONTACTS_COLUMN_DATE, date); 

     db.insert("contacts2", null, contentValues); 

     return true; 
    } 

    public Cursor getData(int id) { 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor res = db.rawQuery("select * from contacts where id = " + id, null); 
     return res; 
    } 

    public Cursor getData2(int id) { 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor res = db.rawQuery("select * from contacts2 where id = " + id, null); 
     return res; 
    } 

    public int numberOfRows() { 
     SQLiteDatabase db = this.getReadableDatabase(); 
     int numRows = (int) DatabaseUtils.queryNumEntries(db, CONTACTS_TABLE_NAME); 
     return numRows; 
    } 


    public boolean updateContact(int id, String name, String phone, String email, String street, String place) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(CONTACTS_COLUMN_NAME, name); 
     contentValues.put(CONTACTS_COLUMN_PHONE, phone); 
     contentValues.put(CONTACTS_COLUMN_EMAIL, email); 
     contentValues.put(CONTACTS_COLUMN_STREET, street); 
     contentValues.put(CONTACTS_COLUMN_CITY, place); 

     db.update("contacts", contentValues, "id = ? ", new String[]{String.valueOf(id)}); 

     return true; 
    } 

    public boolean updateContact2(int id, String income, String legend, String date) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put("income", income); 
     contentValues.put("legend", legend); 
     contentValues.put("date", date); 
     db.update("contacts2", contentValues, "id = ? ", new String[]{String.valueOf(id)}); 
     return true; 
    } 

    public Integer deleteContact(int id) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     return db.delete("contacts", "id = ? ", new String[]{String.valueOf(id)}); 

    } 

    public Integer deleteContact2(int id) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     return db.delete("contacts2", "id = ? ", new String[]{String.valueOf(id)}); 

    } 

    public ArrayList<String> getAllCotacts() { 
     ArrayList<String> array_list = new ArrayList<String>(); 

     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor res = db.rawQuery("select * from contacts", null); 
     res.moveToFirst(); 

     while (res.isAfterLast() == false) { 
      array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME))); 
      res.moveToNext(); 
     } 
     return array_list; 
    } 

    public ArrayList<Float> getFloat() { 
     ArrayList<Float> array_list = new ArrayList<Float>(); 

     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor res = db.rawQuery("select * from contacts", null); 
     res.moveToFirst(); 

     while (res.isAfterLast() == false) { 
      array_list.add(res.getFloat(res.getColumnIndex(CONTACTS_COLUMN_NAME))); 
      res.moveToNext(); 
     } 
     return array_list; 
    } 

    public ArrayList<String> getItem() { 
     ArrayList<String> array_list = new ArrayList<String>(); 

     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor res = db.rawQuery("select * from contacts", null); 
     res.moveToFirst(); 

     while (res.isAfterLast() == false) { 
      array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_PHONE))); 
      res.moveToNext(); 
     } 
     return array_list; 
    } 

    public ArrayList<String> getAllCotacts2() { 
     ArrayList<String> array_list = new ArrayList<String>(); 

     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor res = db.rawQuery("select * from contacts2", null); 
     res.moveToFirst(); 

     while (res.isAfterLast() == false) { 
      array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_INCOME))); 
      res.moveToNext(); 
     } 
     return array_list; 
    } 
} 

希望這將有助於〜