1

在我的活动中，我有 editText's (Username, Firstname, Lastname and Email Address)。当用户输入现有用户名时，他可以通过单击搜索按钮进行搜索，用户拥有的数据将出现在 editText 中。

MainActivity.java

btn_Search.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View arg0) {
        String searchableUser = txt_User.getText().toString();

        ConsUserRegistration consUserRegistration = db.searchUser(searchableUser);

        String searchUser = consUserRegistration.getUser().toString();
        String searchFirst = consUserRegistration.getFirstName().toString();
        String searchLast = consUserRegistration.getLastName().toString();
        String searchEmail = consUserRegistration.getEmail().toString();

        txt_User.setText(searchUser);
        txt_First.setText(searchFirst);
        txt_Last.setText(searchLast);
        txt_Email.setText(searchEmail);             
    }
});

数据库处理程序.java

public ConsUserRegistration searchUser(String username){

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.query(Constants.TABLE_USER, new String[] {Constants.KEY_USER, Constants.KEY_FIRST, 
            Constants.KEY_LAST, Constants.KEY_EMAIL}, Constants.KEY_USER + " =? ", 
            new String[] { String.valueOf(username) }, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    ConsUserRegistration search = new ConsUserRegistration (cursor.getString(0), cursor.getString(1), cursor.getString(2), cursor.getString(3));

    return search;

}

但是当用户单击搜索按钮并且没有从用户名 EditText 输入任何字符时，我CursorIndexOutOfBoundsException在 DatabaseHandler 中遇到错误： ConsUserRegistration search = new ConsUserRegistration (cursor.getString(0), cursor.getString(1) , cursor.getString(2), cursor.getString(3));

此外，由于数据库崩溃，我无法从数据库中检索数据。

4

2 回答 2

1

改变

db.searchUser(searchableUser);
ConsUserRegistration consUserRegistration = new ConsUserRegistration();

到

ConsUserRegistration consUserRegistration = db.searchUser(searchableUser);
于 2013-07-16T06:37:28.410 回答
-2

按钮 button_Search(button)findViewById(rI'd.itsIdInYourXml);

按钮可能需要声明或定义进一步需要查看整个代码

于 2013-07-16T06:52:25.190 回答