如何从数据库中提取数据并将它们作为 ListView 查看

Question

我正在为我的 ListView 使用自定义列表适配器。我的每个列表项都有 4 个项目。它们来自 listArray。

这是从列表数组中提取列表项的代码。

   import android.app.Fragment;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;



import com.rupomkhondaker.sonalibank.adapter.PhoneListAdapter;
import com.rupomkhondaker.sonalibank.model.ContactItem;

import java.util.ArrayList;


public class GMOFragment extends Fragment {
    public GMOFragment(){}


    private boolean database;
    private static final String DB_NAME = "SBLdata.db";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_gmo, container, false);

        final ArrayList<ContactItem> listData = getListData();

        final ListView listView = (ListView) rootView.findViewById(R.id.gmolistView);
        listView.setAdapter(new PhoneListAdapter(getActivity(), listData));


        DataBaseHelper dataOpen = new DataBaseHelper((MainActivity) getActivity(), DB_NAME);
        //Trying to open the DataBase
        database = dataOpen.openDataBase();



        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> a, View v, int position, long id) {
                ContactItem newsData = (ContactItem) listView.getItemAtPosition(position);

                Intent intent = new Intent(getActivity(), ContactDetail.class);

                intent.putExtra("DATA_KEY", newsData);

                startActivity(intent);
            }

        });

        return rootView;
    }

  private ArrayList<ContactItem> getListData() {
        ArrayList<ContactItem> listMockData = new ArrayList<ContactItem>();


       String sqlQuery = "select BR_NAME,PHONE,MOBILE,EMAIL from SBL_Contact";
       Cursor contactsCursor = database.rawQuery(sqlQuery, null);

       ContactItem newsData = null;

      while (contactsCursor.moveToNext()) {
          newsData = new ContactItem();
          newsData.setName(contactsCursor.getString(0));
          newsData.setPhone(contactsCursor.getString(1));
          newsData.setMobile(contactsCursor.getString(2));
          newsData.setEmail(contactsCursor.getString(3));

          listMockData.add(newsData);
      }
        return listMockData;
    }

}

但现在我在 SBL_Contact（table 名称）列 1.NAME、2.PHONE 中的 SBLdata (databse_name) 中创建了相同的列表3.MOBILE , 4.EMAIL

现在请帮我拉取数据并将它们设置到 getListData()

Answer 1

您可以创建一个 sql 查询，例如：

String sqlQuery = "select name,phone,mobile,email from SBL_Contact";

然后配合游标使用得到结果：

Cursor contactsCursor = database.rawQuery(sqlQuery, null);

然后遍历您的光标：

ContactItem newsData = null;

while (contactsCursor.moveToNext()) {
       newsData = new ContactItem();
       newsData.setName(contactsCursor.getString(0));
       newsData.setPhone(contactsCursor.getString(1));
       newsData.setMobile(contactsCursor.getString(2));
       newsData.setEmail(contactsCursor.getString(3));

       listMockData.add(newsData);
    }

如何从数据库中提取数据并将它们作为 ListView 查看

How to pull data from database and view them as a ListView

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android-cursoradapter