Implement custom multi select ListView with custom ArrayAdapter

The post "Multi Choice ListView" demonstrate how to implement multi select ListView with build-in layout with simple TextView. This exercise demonstrate how to implement multi select ListView with custom layout, using custom ArrayAdapter.

Create /res/layout/row.xml to define the layout of rows in our custom ListView.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    
    <ImageView 
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@drawable/ic_launcher"/>
    <CheckedTextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/listPreferredItemHeightSmall"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:gravity="center_vertical"
        android:checkMark="?android:attr/listChoiceIndicatorMultiple"
        android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
        android:paddingRight="?android:attr/listPreferredItemPaddingRight"/>
</LinearLayout>

Layout of our example.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/getresult"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Get Result"/>
    <ListView
        android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Main Java code.

package com.example.androidmultichoicelist;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {
 
 ListView myListView;
 Button getResult;
 
 private ArrayList<String> dayOfWeekList = new ArrayList<String>();

 private void initDayOfWeekList(){
  dayOfWeekList.add("Sunday");
  dayOfWeekList.add("Monday");
  dayOfWeekList.add("Tuesday");
  dayOfWeekList.add("Wednesday");
  dayOfWeekList.add("Thursday");
  dayOfWeekList.add("Friday");
  dayOfWeekList.add("Saturday");
  
 }
 
 MyArrayAdapter myArrayAdapter;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initDayOfWeekList();
        setContentView(R.layout.activity_main);
        
        myListView = (ListView)findViewById(R.id.list);

        myArrayAdapter = new MyArrayAdapter(
          this,
          R.layout.row,
          android.R.id.text1,
          dayOfWeekList
          );
        
        myListView.setAdapter(myArrayAdapter);
        myListView.setOnItemClickListener(myOnItemClickListener);
        
        getResult = (Button)findViewById(R.id.getresult);
        getResult.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    String result = "";
    
    /*
    //getCheckedItemPositions
    List<Integer> resultList = myArrayAdapter.getCheckedItemPositions();
    for(int i = 0; i < resultList.size(); i++){
     result += String.valueOf(resultList.get(i)) + " ";
    }
    */
    
    //getCheckedItems
    List<String> resultList = myArrayAdapter.getCheckedItems();
    for(int i = 0; i < resultList.size(); i++){
     result += String.valueOf(resultList.get(i)) + "\n";
    }
    
    myArrayAdapter.getCheckedItemPositions().toString();
    Toast.makeText(
      getApplicationContext(), 
      result, 
      Toast.LENGTH_LONG).show();
   }});
        
    }
    
    OnItemClickListener myOnItemClickListener
    = new OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   myArrayAdapter.toggleChecked(position);
   
  }};
    
    private class MyArrayAdapter extends ArrayAdapter<String>{
     
     private HashMap<Integer, Boolean> myChecked = new HashMap<Integer, Boolean>();

  public MyArrayAdapter(Context context, int resource,
    int textViewResourceId, List<String> objects) {
   super(context, resource, textViewResourceId, objects);
   
   for(int i = 0; i < objects.size(); i++){
    myChecked.put(i, false);
   }
  }
     
  public void toggleChecked(int position){
   if(myChecked.get(position)){
    myChecked.put(position, false);
   }else{
    myChecked.put(position, true);
   }
   
   notifyDataSetChanged();
  }
  
  public List<Integer> getCheckedItemPositions(){
   List<Integer> checkedItemPositions = new ArrayList<Integer>();
   
   for(int i = 0; i < myChecked.size(); i++){
    if (myChecked.get(i)){
     (checkedItemPositions).add(i);
    }
   }
   
   return checkedItemPositions;
  }
  
  public List<String> getCheckedItems(){
   List<String> checkedItems = new ArrayList<String>();
   
   for(int i = 0; i < myChecked.size(); i++){
    if (myChecked.get(i)){
     (checkedItems).add(dayOfWeekList.get(i));
    }
   }
   
   return checkedItems;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   View row = convertView;
   
   if(row==null){
    LayoutInflater inflater=getLayoutInflater();
    row=inflater.inflate(R.layout.row, parent, false);  
   }
   
   CheckedTextView checkedTextView = (CheckedTextView)row.findViewById(R.id.text1);
   checkedTextView.setText(dayOfWeekList.get(position));
   
   Boolean checked = myChecked.get(position);
   if (checked != null) {
    checkedTextView.setChecked(checked);
            }
   
   return row;
  }
  
    }

}

Download the files.