在android中将数据从URL添加到SQLite数据库时，记录在10秒后重复

我试图将URL中的一些字段添加到SQLite数据库中。在这里，我遇到了一个问题，比如在添加10条记录之后，这些记录从一开始就添加了。我正在CustomAdapter的getView方法中执行此操作。如果我所做的是错误的，建议我任何解决方案或指导我

这是我的DatabaseHandler类

public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 2;

// Database Name
private static final String DATABASE_NAME = "contactsManager";

// Contacts table name
private static final String TABLE_CONTACTS = "contacts";

// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_PH_NO = "phone_number";

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

// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
            + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
            + KEY_PH_NO + " TEXT" + ")";
    db.execSQL(CREATE_CONTACTS_TABLE);
}

// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // Drop older table if existed
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);

    // Create tables again
    onCreate(db);
}

/**
 * All CRUD(Create, Read, Update, Delete) Operations
 */

// Adding new contact
void addContact(Contact contact) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_NAME, contact.getName()); // Contact Name
    values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone

    // Inserting Row
    db.insert(TABLE_CONTACTS, null, values);
    db.close(); // Closing database connection
}


// Getting All Contacts
public List<Contact> getAllContacts() {
    List<Contact> contactList = new ArrayList<Contact>();
    // Select All Query
    String selectQuery = "SELECT  * FROM " + TABLE_CONTACTS;

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

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            Contact contact = new Contact();
            contact.setID(Integer.parseInt(cursor.getString(0)));
            contact.setName(cursor.getString(1));
            contact.setPhoneNumber(cursor.getString(2));
            // Adding contact to list
            contactList.add(contact);
        } while (cursor.moveToNext());
    }

    // return contact list
    return contactList;
}

我的适配器类的getView方法是

public View getView(int i, View view, ViewGroup viewGroup) {
    view = inflater.inflate(R.layout.single_item,null);
    TextView tvName = (TextView)view.findViewById(R.id.txtName);
    TextView tvMobile = (TextView)view.findViewById(R.id.txtPhone);
    DatabaseHandler db = new DatabaseHandler(activity);
    db.addContact(new Contact(dataList.get(i).getName(),dataList.get(i).getPhoneNumber()));
    List<Contact> contacts = db.getAllContacts();
    Log.d("contacts",contacts.get(i).getName()+"");
    tvName.setText(contacts.get(i).getName());
    tvMobile.setText(contacts.get(i).getPhoneNumber());
    return view;
}

logcat的响应类似于

---

实际数据包含14条记录，但最后4条记录没有出现

getView方法是一种在需要渲染屏幕时调用的方法。所以getView方法可以被多次调用。因此，您应该在此方法之外执行数据库操作

例如，在活动类中：

    ...
    contactListView (ListView)findViewById(R.id.lv_contacts_container);<-- your xml
    contactList = db.getAllContacts();
    adapter = new ContactListViewAdapter(this, contactList);
    contactListView.setAdapter(adapter);

    contactListView.setOnItemClickListener(new 
    AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {

            //Selected contact entity
            ContactEntity entity = adapter.getData().get(position);
            ...
        }

    });

您的适配器类可能如下所示：

public class ContactListViewAdapter extends BaseAdapter {

Context context;
LayoutInflater inflater;
private List<ContactEntity> contactList;

public ContactListViewAdapter(Context context, List<ContactEntity> contactList) {
    this.context = context;
    this.contactList = new ArrayList<>();
    this.contactList.addAll(contactList);
}

@Override
public int getCount() {
    return contactList.size();
}

public List<ContactEntity> getData() {
    return this.contactList;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ContactRowViewHolder holder;
    if (convertView == null) {
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.contact_list_row, parent, false); <--your row xml
        holder = new ContactRowViewHolder();
        holder.contactNameTextView = (TextView) convertView.findViewById(R.id.contact_text); <-- your text view in row 
        convertView.setTag(holder);
    } else {
        holder = (ContactRowViewHolder) convertView.getTag();
    }

    ContactEntity contact = contactList.get(position);
    if (contact == null || contact.getContactName() == null) {
        // error log
    }
    holder.contactNameTextView.setText(contact.getContactName());
    return convertView;
}

static class ContactRowViewHolder {
    private TextView contactNameTextView;
}
}

---

注意：holder模式适用于长列表

能否显示getCount方法。要显示多少记录，以及每次getview调用时添加新记录，这不是首选方式。public int getCount{return dataList.size；}count与bro匹配，但最后4个字段被前4个字段替换。如何在getview方法之外添加？是否有可能？谢谢你兄弟。。。通过添加外部getview，问题已经解决了。欢迎您：您可以将其作为已接受的答案进行检查吗？