如何从数据库中获取列表视图项目中每个项目的ID

Question

这是我在 activity

中的代码

 @Override
        protected void onCreate( Bundle savedInstanceState ) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.patient_list);

            try{

                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                displaypatientinfo = (ListView)findViewById(R.id.lv_patientlist);
                mydb  = new DatabaseHelper(getApplicationContext());
                sqLiteDatabase = mydb.getReadableDatabase();
                String selection = "pat_type=? OR pat_type=? AND is_active=?";
                String[] selectionargs = {"Infant","Mother","1"};
                cursor  = mydb.getallpatient(sqLiteDatabase,selection,selectionargs);
                listDataAdapter = new ListDataAdapter(this, R.layout.resource_patientlist);
                displaypatientinfo.setAdapter(listDataAdapter);
                if(cursor.moveToFirst()){
                    do{
                        String id, firstname, middlename, lastname, birthdate;
                        id = cursor.getString(0);`enter code here`
                        firstname = cursor.getString(1);
                        middlename = cursor.getString(2);
                        lastname = cursor.getString(3);
                        birthdate = cursor.getString(4);
                        DataProvider dataProvider = new DataProvider(id, firstname, middlename, lastname, birthdate);
                        listDataAdapter.add(dataProvider);
                    }while(cursor.moveToNext());
                }else{


                }

       displaypatientinfo.setOnItemClickListener(new OnItemClickListener() {
                    @Override
 public void onItemClick( AdapterView<?> parent, View view, int position, long id ) {
                       // just wanna ask your help here that if the user click item on listview it will return the id from the database 



                    }
                });
            }catch (Exception e){
                e.printStackTrace();
            }

        }

这是我的列表适配器中的代码

package com.example.asus.wombapp;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.asus.wombapp.onclicklistener.PatientList_Listener;

import java.util.ArrayList;
import java.util.List;


/**
 * Created by asus on 11/04/2018.
 */

public class ListDataAdapter extends ArrayAdapter {

    private Context context;

    List list = new ArrayList();

    public ListDataAdapter( Context context, int resource) {

        super(context, resource);
        this.context = context;
    }




    static class LayoutHandler
    {
        TextView id, name, birthdate;
        ImageView patientimage,edit,delete;

    }

    @Override
    public void add(Object object){
        super.add(object);
        list.add(object);
    }


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

    @Override
    public Object getItem(int position){

        return list.get(position);
    }


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

        ImageView delete;
        View row = ConvertView;
        LayoutHandler layoutHandler;
        DataProvider dataprovider = (DataProvider) this.getItem(position);
        if(row  == null){
            LayoutInflater layoutInflater= (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            row  = layoutInflater.inflate(R.layout.resource_patientlist,parent,false);
            layoutHandler = new LayoutHandler();
            final PatientList patientList = new PatientList();
            layoutHandler.id = (TextView)row.findViewById(R.id.tv_id);
            layoutHandler.name = (TextView)row.findViewById(R.id.tv_patientname);
            layoutHandler.birthdate = (TextView)row.findViewById(R.id.tv_actualbirthdate);
            layoutHandler.patientimage = (ImageView) row.findViewById(R.id.image_patient);
            layoutHandler.edit = (ImageView)row.findViewById(R.id.image_edit);
            layoutHandler.delete = (ImageView)row.findViewById(R.id.image_delete);
            layoutHandler.delete.setOnClickListener(new PatientList_Listener(this.context,dataprovider.getId()));
            layoutHandler.edit.setOnClickListener(new PatientList_Listener(this.context,dataprovider.getId()));
            row.setTag(layoutHandler);
        }else{
            layoutHandler = (LayoutHandler)row.getTag();
        }
        //set value from database to resourceview

        layoutHandler.id.setText(dataprovider.getId());
        layoutHandler.name.setText(dataprovider.getFirtsname() + " " + dataprovider.getMiddlename() +" " + dataprovider.getLastname());
        layoutHandler.birthdate.setText(dataprovider.getBirthdate());
        layoutHandler.patientimage.setImageResource(R.drawable.picture);
        layoutHandler.delete.setImageResource(R.drawable.delete_data);
        layoutHandler.edit.setImageResource(R.drawable.edit_data);

        return row;
    }

}

希望你能帮助我 activity 我有一个列表视图，其中所有数据都来自数据库我只是想请你帮忙如何获取列表视图中项目的 ID。一旦用户单击列表视图上的项目，我就可以获得该项目的主键，请帮助我我试图获取的 ID 是 listAdapter 中的 dataprovider.getId() 请希望任何人都可以提供帮助

Answer 1

您可以使用以下内容：

((DataProvider)listDataAdapter.getItem(position)).getId();

Answer 2

首先，将 listDataAdapter 按位置获取到 return DataProvider，然后像这样获取它的 Id：

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

        String id = listDataAdapter.get(position).getId();

    }
});

如何从数据库中获取列表视图项目中每个项目的ID

How to get ID in each item in the listview item is from the database

android

listview

android-cursor