Base Adapter

In this tutorial, I will show you an example in android using BaseAdapter. See codes below!

MainActivity.java

package com.example.activity;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

import android.widget.Toast;

import com.example.adapters.BaseAdapters;

import com.example.models.RowItem;

public class MainActivity extends Activity {

private List<RowItem> row_items;

private ListView list;

private String title[] = {"Dota", "Counter Strike", "Dota 2"};

private String description[] = {"Defence of the Ancient", "Fire in the hole", "Defence of the Ancient Upgrade"};

private int image[] = {R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

try{

row_items = new ArrayList<RowItem>();

for(int x = 0; x <= title.length; x++){

RowItem item = new RowItem(image[x], title[x], description[x]);

row_items.add(item);

}

}catch(Exception e){

e.printStackTrace();

}

list = (ListView)findViewById(R.id.lv_display);

BaseAdapters adapter = new BaseAdapters(getApplicationContext(), row_items);

list.setAdapter(adapter);

list.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

// TODO Auto-generated method stub

Toast.makeText(getApplicationContext(), "Item "+ arg2+1 + ":" + row_items.get(arg2), Toast.LENGTH_SHORT).show();

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

BaseAdapters.java

package com.example.adapters;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

import com.example.activity.R;

import com.example.models.RowItem;

public class BaseAdapters extends BaseAdapter{

private Context m_context;

private List<RowItem> list;

public BaseAdapters(Context context, List<RowItem> row_items){

this.m_context = context;

this.list = row_items;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return list.size();

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return list.get(position);

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return list.indexOf(getItem(position));

}

private class ViewHolder{

ImageView images;

TextView title, description;

}

@SuppressWarnings("null")

@Override

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

// TODO Auto-generated method stub

try{

ViewHolder holder = null;

LayoutInflater inflates = (LayoutInflater) m_context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

if(convertView == null){

convertView = inflates.inflate(R.layout.list_item, null);

holder = new ViewHolder();

holder.images = (ImageView)convertView.findViewById(R.id.iv_image);

holder.title = (TextView)convertView.findViewById(R.id.tv_title);

holder.description = (TextView)convertView.findViewById(R.id.tv_description);

convertView.setTag(holder);

}else{

holder = (ViewHolder) convertView.getTag();

}

RowItem row = (RowItem) getItem(position);

holder.images.setImageResource(row.getImage());

holder.title.setText(row.getTitle());

holder.description.setText(row.getDescription());

}catch(Exception e){

e.printStackTrace();

}

return convertView;

}

}

RowItem.java

package com.example.models;

public class RowItem {

private int m_image;

private String m_title;

private String m_description;

public RowItem(int image, String title, String description){

this.m_image = image;

this.m_title = title;

this.m_description = description;

}

public void setImage(int image){

this.m_image = image;

}

public int getImage(){

return this.m_image;

}

public void setTitle(String title){

this.m_title = title;

}

public String getTitle(){

return this.m_title;

}

public void setDescription(String description){

this.m_description = description;

}

public String getDescription(){

return this.m_description;

}

public String toString(){

return this.m_title +"\n"+this.m_description;

}

}

activity_main.xml

<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" >

    <ListView

        android:id="@+id/lv_display"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true" >

    </ListView>

</RelativeLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="fill_parent" >

    <ImageView

        android:id="@+id/iv_image"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="10dp"

        android:layout_marginTop="10dp"

        android:scaleType="fitXY"

        android:src="@drawable/ic_launcher" />

    <TextView

        android:id="@+id/tv_title"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignTop="@+id/iv_image"

        android:layout_marginLeft="15dp"

        android:layout_toRightOf="@+id/iv_image"

        android:textSize="20sp"

        android:text="Title" />

    <TextView

        android:id="@+id/tv_description"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/tv_title"

        android:layout_below="@+id/tv_title"

        android:textSize="16sp"

        android:text="Description" />

</RelativeLayout>

Output:

That's it. Hope this simple tutorial may help you. Happy Coding!