Android Example- ListView with BaseAdapter

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/lvCustomList"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

MainActivity.java

package in.kantapp.example30;


import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ListView lvDetail;
    Context context = MainActivity.this;
    ArrayList myList = new ArrayList();

    String[] title = new String[]{
            "Title 1", "Title 2", "Title 3", "Title 4",
            "Title 5", "Title 6", "Title 7", "Title 8"
    };
    String[] desc = new String[]{
            "Desc 1", "Desc 2", "Desc 3", "Desc 4",
            "Desc 5", "Desc 6", "Desc 7", "Desc 8"
    };
    int[] img = new int[]{
            R.drawable.a,
            R.drawable.b,
            R.drawable.c,
            R.drawable.d,
            R.drawable.e,
            R.drawable.f,
            R.drawable.g,
            R.drawable.h,
    };

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

        lvDetail = (ListView) findViewById(R.id.lvCustomList);
        // insert data into the list before setting the adapter
        // otherwise it will generate NullPointerException  - Obviously
        getDataInList();
        lvDetail.setAdapter(new MyBaseAdapter(context, myList));
    }

    private void getDataInList() {
        for (int i = 0; i < title.length; i++) {
            // Create a new object for each list item
            ListData ld = new ListData();
            ld.setTitle(title[i]);
            ld.setDescription(desc[i]);
            ld.setImgResId(img[i]);
            // Add this object into the ArrayList myList
            myList.add(ld);
        }
    }

}

ListData.java

package in.kantapp.example30;

public class ListData {

    String Description;
    String title;
    int imgResId;

    public String getDescription() {
        return Description;
    }

    public void setDescription(String description) {
        Description = description;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getImgResId() {
        return imgResId;
    }

    public void setImgResId(int imgResId) {
        this.imgResId = imgResId;
    }

}

MyBaseAdapter.java

package in.kantapp.example30;

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 java.util.ArrayList;

public class MyBaseAdapter extends BaseAdapter {

    ArrayList myList = new ArrayList();
    LayoutInflater inflater;
    Context context;


    public MyBaseAdapter(Context context, ArrayList myList) {
        this.myList = myList;
        this.context = context;
        inflater = LayoutInflater.from(this.context);
    }

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

    @Override
    public ListData getItem(int position) {
        return (ListData) myList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

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

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.layout_list_item, parent, false);
            mViewHolder = new MyViewHolder(convertView);
            convertView.setTag(mViewHolder);
        } else {
            mViewHolder = (MyViewHolder) convertView.getTag();
        }

        ListData currentListData = getItem(position);

        mViewHolder.tvTitle.setText(currentListData.getTitle());
        mViewHolder.tvDesc.setText(currentListData.getDescription());
        mViewHolder.ivIcon.setImageResource(currentListData.getImgResId());

        return convertView;
    }

    private class MyViewHolder {
        TextView tvTitle, tvDesc;
        ImageView ivIcon;

        public MyViewHolder(View item) {
            tvTitle = (TextView) item.findViewById(R.id.tvTitle);
            tvDesc = (TextView) item.findViewById(R.id.tvDesc);
            ivIcon = (ImageView) item.findViewById(R.id.ivIcon);
        }
    }
}

layout_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:padding="10dp">

    <ImageView
        android:id="@+id/ivIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="Title" />

        <TextView
            android:id="@+id/tvDesc"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="Description" />
    </LinearLayout>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.kantapp.example30">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>