Question

我正在做一个项目，我想在ListView中显示联系人名称列表。从本地sqli db中检索名称。到目前为止，我已设法检索名称并使用标准ArrayAdapter类显示它们。

但是为了更多的控制，我正在尝试创建自己的适配器，以便我也可以在每一行上显示控制按钮。我对这段代码感到困惑：

private void fillData() {
    Cursor mContactsCursor = mDbAdapter.getAllContacts();
    startManagingCursor(mContactsCursor);

    String [] from = new String[] {ContactsDbAdapter.COLUMN_FNAME, ContactsDbAdapter.COLUMN_LNAME};
    int [] to = new int [] { R.id.fname, R.id.lname};


    //What variables should constructor take? 
    adapter = new ContactsListAdapter(this, from, to);

    data.setAdapter(adapter);

}

基本上我不知道如何将这些值传递给构造函数，或者我是否应该这样做？

String [] from = new String[] {ContactsDbAdapter.COLUMN_FNAME,   ContactsDbAdapter.COLUMN_LNAME};
    int [] to = new int [] { R.id.fname, R.id.lname};

这是我的ContactsListAdapter类：

public class ContactsListAdapter extends ArrayAdapter<Contact> {

private List<Contact> contacts;
private Button deleteBtn;
private Button editBtn;
private TextView name;

public ContactsListAdapter(Context context,List<Contact> contacts) {
    super(context, R.layout.contact_row, contacts);
    this.contacts = contacts;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    View v = convertView;

    if(v == null){
        LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.contact_row, null);
    }

    //assign values to the view
    final Contact c = this.contacts.get(position);

    //add listeners to buttons
    deleteBtn = (Button)v.findViewById(R.id.deleteBtn);
    deleteBtn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Toast.makeText(v.getContext(), "Deleted", Toast.LENGTH_SHORT).show();
        }
    });

    editBtn = (Button)v.findViewById(R.id.editBtn);
    editBtn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Toast.makeText(v.getContext(), "Edit", Toast.LENGTH_SHORT).show();
        }
    });


    //insert name into the text view
    name = (TextView)v.findViewById(R.id.name);
    name.setText(c.getName());

    return v;

}

}

这个类的代码取自我使用自定义列表适配器的示例，该适配器从硬编码数组中获取数据，因此在从数据库获取数据时我可能遗漏了一些东西。

非常感谢任何建议。非常感谢。

Answer 1

参考这个例子，

http://www.ezzylearning.com/tutorial.aspx?tid=1763429

请告诉我，如果您仍然对如何将值传递给Custom ArrayListAdapter ...

感到困惑

请从表中检索所有记录，如下所示，并将其添加到arrayList

contactList.add(contact);

代码片段

  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;
    }

new CustomerAdapter（this，resid，contactList）; //这就是您需要自定义适配器的方式在您的自定义适配器

中

公共类CustomAdapter扩展了ArrayAdapter {

Context context; 
ArrayList<Tip> objects; 

public CustomAdapter(Context applicationContext, int dovizLayout, ArrayList<Contact> ts) {
    super(applicationContext, dovizLayout);
    this.context = applicationContext;
    this.objects = (ArrayList) ts;
}

自定义ArrayAdapter，包含来自SQLite本地数据库的数据

1 个答案: