从ListView中检索CheckBox的值并分配给数组列表

Question

我有一个应用程序，当前在ListView中显示名称列表。 ListView中的每个项目都包含一个CheckBox和一个EditText。

名称列表由'Prospects'对象的ArrayList提供

当用户选择CheckBox时，我想返回此复选框的状态，并在ArrayList中的相关位置为其分配Propsects对象，以便在下次打开应用程序时将其保存以供使用（这将是使用CSV完成。

我正在努力使用正确的侦听器来执行此操作，因为这是我第一次尝试Android编程。我一直无法找到任何符合我想要实现的例子，或者如果我没有理解它们！

任何帮助将不胜感激！

我的代码如下：

package com.veetox.networkmarketingmanager;

import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AdapterView;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.veetox.networkmarketingmanager.data.Prospects;
import com.veetox.networkmarketingmanager.helper.FileHelper;
import com.veetox.networkmarketingmanager.helper.ProspectListAdapter;
import com.veetox.networkmarketingmanager.helper.ProspectViewHolder;

import java.io.File;
import java.lang.reflect.Field;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity
{
    public static ArrayList<Prospects> prospectList = new ArrayList<>();
    Resources res;
    FileHelper fileHelper = new FileHelper(this);
    ListView prospectsListEntry;
    CheckBox prospectsCheckBox;
    EditText prospectsEditText;
    ProspectListAdapter pla;



    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        prospectsCheckBox = (CheckBox) findViewById(R.id.pr_checkBox);
        prospectsEditText = (EditText) findViewById(R.id.pr_name);

        res = getResources();

        createProspectList();

        prospectsListEntry.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            @Override
            public void onItemClick(AdapterView<?> parent, View item, int position, long id)
            {
                //Create new Prospect cloning Prospect at row in ItemList that was clicked
                Prospects prospect = pla.getItem(position);

                //Change the state of contacted from true to false or vice versa
                prospect.toggleContacted();

                //Create a ProspectViewHolder to hold the view for the row clicked
                ProspectViewHolder viewHolder = (ProspectViewHolder) item.getTag();
                viewHolder.getCheckBox().setChecked(prospect.isChecked());

                prospectList.get(position) ;
                pla.notifyDataSetChanged();

            }
        });



    }

    public void testProspects(View view)
    {
        prospectList = fileHelper.testProspects();
        pla.notifyDataSetChanged();

    }


    public void createProspectList()
    {
        fileHelper = new FileHelper(this);

        //Comment before testing
        //prospectList = fileHelper.loadProspects();

        //Uncomment for testing
        prospectList = fileHelper.testProspects();

        //Create the list
        pla = new ProspectListAdapter(this, R.layout.prospects_list_layout, prospectList);
        prospectsListEntry = (ListView) findViewById(R.id.prospects_list);
        prospectsListEntry.setAdapter(pla);

    }
}

package com.veetox.networkmarketingmanager.helper;

import android.content.Context;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.TextView;

import com.veetox.networkmarketingmanager.MainActivity;
import com.veetox.networkmarketingmanager.R;
import com.veetox.networkmarketingmanager.data.Prospects;

import java.util.ArrayList;

/**
 * Created by Matt on 29/09/2016.
 */

public class ProspectListAdapter extends ArrayAdapter<Prospects>
{

    private Context context;
    private int layoutResourceId;
    private ArrayList<Prospects> prospect;



    public ProspectListAdapter(Context context, int layoutResourceId, ArrayList<Prospects> prospect)
    {
        super(context, layoutResourceId, prospect);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.prospect = prospect;

    }

    public int getCount()
    {
        return prospect.size();
    }


    public Prospects getItem(int position)
    {
        return prospect.get(position);
    }

    public long getItemId(int position)
    {
        return position;
    }

    @Override
    @NonNull
    public View getView(int position, View convertView, @NonNull ViewGroup parent)
    {
        View v = convertView;

        if (v == null)
        {
            LayoutInflater vi;
            vi = LayoutInflater.from(context);
            v = vi.inflate(layoutResourceId, parent, false);
        }

        Prospects prospects = prospect.get(position);

        if (prospects != null)
        {
            TextView prname = (TextView) v.findViewById(R.id.pr_name);
            CheckBox complete = (CheckBox) v.findViewById(R.id.pr_checkBox);


            if (prname != null)
            {
                prname.setText(prospects.getName());
            }

            if (complete != null)
            {
                complete.setChecked(prospects.isChecked());
            }


        }




        return v;
    }



}

package com.veetox.networkmarketingmanager.data;


/**
 * A Prospective customer
 */

public class Prospects
{
    private String prospectname;
    private boolean contacted;
    private String stringContacted;

    public Prospects(String aName, boolean contacted)
    {
        prospectname = aName;
        this.contacted = contacted;
    }

    public Prospects(String aName, String contacted)
    {
        prospectname = aName;
        this.stringContacted = contacted;
    }

    public Prospects(String aName)
    {
        prospectname = aName;
    }

    public String getName()
    {
        return prospectname;
    }

    public boolean isChecked()
    {
        return contacted;
    }

    public void setName (String aName)
    {
        prospectname = aName;
    }

    public void setContacted(boolean contacted)
    {
        this.contacted = contacted;
    }

    public void toggleContacted()
    {
        if (contacted)
        {
            contacted = false;
        }
        else
        {
            contacted = true;
        }
    }




}

package com.veetox.networkmarketingmanager.helper;

import android.content.Context;
import android.widget.Toast;

import com.veetox.networkmarketingmanager.data.Prospects;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Map;
import java.util.Scanner;


/**
 * Created by Matt on 28/09/2016.
 */

public final class FileHelper
{
    Context context;


   public FileHelper(Context aContext)
   {
       context = aContext;




   }


    public void saveProspects(ArrayList<Prospects> prospects)
    {

        ArrayList<Prospects> p = prospects;

        BufferedWriter bufferedFileWriter = null;


        try
        {
            File aFile = new File(context.getFilesDir(), "prospects.csv");
            aFile.createNewFile();

            bufferedFileWriter = new BufferedWriter(new FileWriter(aFile));

            for (Prospects eachProspect : p)
            {
                bufferedFileWriter.write(eachProspect.getName());
                bufferedFileWriter.write(",");
                bufferedFileWriter.write(String.valueOf(eachProspect.isChecked()));
                bufferedFileWriter.newLine();
            }


        }
        catch (Exception e)
        {
            e.printStackTrace();
            // Toast.makeText(context, e.toString(), Toast.LENGTH_SHORT).show();
        }
        finally
        {
            try
            {
                bufferedFileWriter.close();
            }
            catch (Exception e)
            {
                e.printStackTrace();
                //Toast.makeText(context, e.toString(), Toast.LENGTH_SHORT).show();
            }
        }

    }

    public ArrayList<Prospects> loadProspects()
    {
        ArrayList<Prospects> prospectsList = new ArrayList<>();
        Scanner bufferedScanner = null;
        Scanner lineScanner = null;



            try
            {
                File aFile = new File(context.getFilesDir(), "prospects.csv");
                bufferedScanner = new Scanner(new BufferedReader(new FileReader(aFile)));
                while (bufferedScanner.hasNextLine())
                {
                    lineScanner = new Scanner(bufferedScanner.nextLine());
                    lineScanner.useDelimiter(",");
                    String prospect = lineScanner.next();
                    String contacted = lineScanner.next();

                    Prospects aProspect = new Prospects(prospect, contacted);
                    prospectsList.add(aProspect);

                }

            }
            catch (Exception e)
            {
                e.printStackTrace();
                //Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show();
            }
            finally
            {
                try
                {
                    bufferedScanner.close();
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                    //Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show();
                }
            }
                return prospectsList;
            }

        public ArrayList<Prospects> testProspects()
        {
            ArrayList<Prospects> p = new ArrayList<>();

            Prospects q = new Prospects("Matt Lee", true);
            Prospects r = new Prospects("Rosemary Watson", false);
            Prospects s = new Prospects("Joe Bloggs", false);
            Prospects t = new Prospects("Ronny Corbit", false);
            Prospects u = new Prospects("Mr Man", false);
            Prospects v = new Prospects("Mr Bond", true);
            Prospects w = new Prospects("Mr Blobby", true);
            Prospects x = new Prospects("Mary Rose", false);
            Prospects y = new Prospects("Jane Doe", false);
            Prospects z = new Prospects("Lucy Sanders", false);

            p.add(q);
            p.add(r);
            p.add(s);
            p.add(t);
            p.add(u);
            p.add(v);
            p.add(w);
            p.add(x);
            p.add(y);
            p.add(z);

            return p;
        }



}

Answer 1

您需要在适配器中移动复选框检查（选中/未检查）。您将需要ItemId来访问和检索ListView中单击的项目。