Android ListView with Adapter Example

How android ListView with adapter works is not so clear to me until I read this awesome examples and article of Lucas Rocha: Performance Tips for Android’s ListView.

Today I’m going to show you the code I use whenever I wanted the user to select an “item” in an AlertDialog with ListView. If you are looking for an example AlertDialog with simple ListView (without an adapter), here’s a blog post I made: Android AlertDialog with ListView.

A ListView item here contains a text (item name) and an ID (item ID), so whenever the user selects an item in the pop up, you’ll be able to get the text and ID of that selected item. This is very useful if the items are from a database – records with IDs and names. The tags (item IDs) were set using the TextView’s setTag() method.

Video Demo

Here’s the final output of our code for today. Name and ID were fetched and show via toast.

Code Download

You can download the code we used here: ListViewPopUpWithAdapter.zip

Let’s Code!

We only need 6 files to run this sample code successfully.

1. activity_main.xml – our main layout. Our trigger to show the ListView is a button.

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/buttonShowPopUp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Show AlertDialog with ListView" />

</RelativeLayout>

2. MainActivity.java – will show the main layout, a button at the center of the screen. Clicking that button will show our awesome ListView.

package com.example.listviewpopupwithadapter;

import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.app.Activity;
import android.app.AlertDialog;

public class MainActivity extends Activity {

    AlertDialog alertDialogStores;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // a button to show the pop up with a list view
        View.OnClickListener handler = new View.OnClickListener(){
            public void onClick(View v) {
                switch (v.getId()) {

                    case R.id.buttonShowPopUp:
                        showPopUp();
                        break;
                }
            }
        };

        findViewById(R.id.buttonShowPopUp).setOnClickListener(handler);

    }

    public void showPopUp(){

        // add your items, this can be done programatically
        // your items can be from a database
        ObjectItem[] ObjectItemData = new ObjectItem[20];

        ObjectItemData[0] = new ObjectItem(91, "Mercury");
        ObjectItemData[1] = new ObjectItem(92, "Watson");
        ObjectItemData[2] = new ObjectItem(93, "Nissan");
        ObjectItemData[3] = new ObjectItem(94, "Puregold");
        ObjectItemData[4] = new ObjectItem(95, "SM");
        ObjectItemData[5] = new ObjectItem(96, "7 Eleven");
        ObjectItemData[6] = new ObjectItem(97, "Ministop");
        ObjectItemData[7] = new ObjectItem(98, "Fat Chicken");
        ObjectItemData[8] = new ObjectItem(99, "Master Siomai");
        ObjectItemData[9] = new ObjectItem(100, "Mang Inasal");
        ObjectItemData[10] = new ObjectItem(101, "Mercury 2");
        ObjectItemData[11] = new ObjectItem(102, "Watson 2");
        ObjectItemData[12] = new ObjectItem(103, "Nissan 2");
        ObjectItemData[13] = new ObjectItem(104, "Puregold 2");
        ObjectItemData[14] = new ObjectItem(105, "SM 2");
        ObjectItemData[15] = new ObjectItem(106, "7 Eleven 2");
        ObjectItemData[16] = new ObjectItem(107, "Ministop 2");
        ObjectItemData[17] = new ObjectItem(108, "Fat Chicken 2");
        ObjectItemData[18] = new ObjectItem(109, "Master Siomai 2");
        ObjectItemData[19] = new ObjectItem(110, "Mang Inasal 2");

        // our adapter instance
        ArrayAdapterItem adapter = new ArrayAdapterItem(this, R.layout.list_view_row_item, ObjectItemData);

        // create a new ListView, set the adapter and item click listener
        ListView listViewItems = new ListView(this);
        listViewItems.setAdapter(adapter);
        listViewItems.setOnItemClickListener(new OnItemClickListenerListViewItem());

        // put the ListView in the pop up
        alertDialogStores = new AlertDialog.Builder(MainActivity.this)
            .setView(listViewItems)
            .setTitle("Stores")
            .show();

    }

}

3. ObjectItem.java – each item in the list is considered as an object with name and ID.

package com.example.listviewpopupwithadapter;

//another class to handle item's id and name
public class ObjectItem {

    public int itemId;
    public String itemName;

    // constructor
    public ObjectItem(int itemId, String itemName) {
        this.itemId = itemId;
        this.itemName = itemName;
    }

}

4. ArrayAdapterItem.java – where our ListView performance depends.

package com.example.listviewpopupwithadapter;

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

// here's our beautiful adapter
public class ArrayAdapterItem extends ArrayAdapter<ObjectItem> {

    Context mContext;
    int layoutResourceId;
    ObjectItem data[] = null;

    public ArrayAdapterItem(Context mContext, int layoutResourceId, ObjectItem[] data) {

        super(mContext, layoutResourceId, data);

        this.layoutResourceId = layoutResourceId;
        this.mContext = mContext;
        this.data = data;
    }

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

        /*
         * The convertView argument is essentially a "ScrapView" as described is Lucas post 
         * http://lucasr.org/2012/04/05/performance-tips-for-androids-listview/
         * It will have a non-null value when ListView is asking you recycle the row layout. 
         * So, when convertView is not null, you should simply update its contents instead of inflating a new row layout.
         */
        if(convertView==null){
            // inflate the layout
            LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
            convertView = inflater.inflate(layoutResourceId, parent, false);
        }

        // object item based on the position
        ObjectItem objectItem = data[position];

        // get the TextView and then set the text (item name) and tag (item ID) values
        TextView textViewItem = (TextView) convertView.findViewById(R.id.textViewItem);
        textViewItem.setText(objectItem.itemName);
        textViewItem.setTag(objectItem.itemId);

        return convertView;

    }

}

5. OnItemClickListenerListViewItem.java – answers what will happen if the user clicks an item in the list?

package com.example.listviewpopupwithadapter;

import android.content.Context;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.TextView;
import android.widget.Toast;

/*
 * Here you can control what to do next when the user selects an item
 */
public class OnItemClickListenerListViewItem implements OnItemClickListener {

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

        Context context = view.getContext();

        TextView textViewItem = ((TextView) view.findViewById(R.id.textViewItem));

        // get the clicked item name
        String listItemText = textViewItem.getText().toString();

        // get the clicked item ID
        String listItemId = textViewItem.getTag().toString();

        // just toast it
        Toast.makeText(context, "Item: " + listItemText + ", Item ID: " + listItemId, Toast.LENGTH_SHORT).show();

        ((MainActivity) context).alertDialogStores.cancel();

    }

}

6. list_view_row_item.xml – the layout of each item in the list. You can modify this if you want to have an image or subtitle for each item of your ListView.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp" >

    <TextView
        android:id="@+id/textViewItem"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="Item name here..."
        android:textSize="15dp" />

</RelativeLayout>

 

Reference: Android ListView with Adapter Example from our JCG partner Mike Dalisay at the The Code of a Ninja blog.
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10 Responses to "Android ListView with Adapter Example"

  1. Bill says:

    Love that you’re excited and publishing tutorials. JCG gets a pretty wide distribution. Can I suggest that you implement the ViewHolder pattern in your adapter as it’s an accepted pattern that can significantly increase performance. In your tutorial? Probably not, but people will use your solution as gospel ;) You’ll notice that my friends and I have further extended the ViewHolder pattern with a constructor that accepts a View. We did this to encourage the next person in your code to do it right. We’re calling this “Offensive Programming.” Cheers.

    https://github.com/androidfu/CodeExamples/blob/master/ContactGroupListExample/src/com/androidfu/contactgrouplistexample/ContactGroupListExampleActivity.java

  2. HoangQuan says:

    Hi,Mike Dalisay
    i have a trouble and i hope you could help me.
    This is my code:

    ArrayListApdapter arr=new ArrayListApdapter(MainActivity.this, R.layout.list_custom, ObjectItemData);
    ListView list=(ListView)findViewById(R.id.listView1);
    list.setAdapter(arr);

    i want to show my data into this listView1 but it “Unfortunately,listView1 has stopped”.You can show me how the way to do that.Thanks u

    • NightQh says:

      Hey you, i think
      ArrayListApdapter arr=new ArrayListApdapter(MainActivity.this, R.layout.list_custom, ObjectItemData);\
      you dont have type of ArrayAdapter

  3. James Fiala says:

    Just a heads up- the code download link isn’t working for me. But still, this was a great introductory tutorial. Thanks.

  4. Kazim says:

    Hi,Mike Dalisay,
    I made new project and paste your code in the files as you mentioned the names

    Their is only 1 error in the following line:
    findViewById(R.id.buttonShowPopUp).setOnClickListener(handler);

    Error: handler cannot be resolved to a variable

    I am confused what to do now, I have tried to many things to resolve the issue, but didn’t get success :(
    Hope i will get your reply soon

  5. gaptek says:

    dude, im stuck on step 2.
    using android studio 0.8.0 as IDE, cannot resolve symbol ‘ObjectItem’, ‘ArrayAdapterItem’, ‘list_view_row_item’ and ‘OnItemClickListenerListViewItem’.

    what should i do?

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