part 29 : Custom ArrayList Adapter, mContext Instance Of

 CustomListView.java : 

package first.learn.androidlearningcourse.Listview_Simple;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;

import first.learn.androidlearningcourse.R;

public class CustomListview extends AppCompatActivity {
    ListView listView2;
    Context mContext;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_custom_listview);

        mContext = this;


        listView2 = (ListView) findViewById(R.id.listView2);

        ArrayList<String>  list = new ArrayList<>();

        for(int i=0; i<100; i++){

            list.add("Position : "+i + "#       Size Number : "+(i+1));
        }



        CustomAdapter customAdapter = new CustomAdapter(mContext, R.layout.custom_list_item, list );

        listView2.setAdapter(customAdapter);




    }
}

CheckInstance.java

package first.learn.androidlearningcourse.Listview_Simple;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;

import first.learn.androidlearningcourse.R;

public class CheckInstance extends AppCompatActivity {

    ListView listView2;
    Context mContext;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_custom_listview);

        mContext = this;


        listView2 = (ListView) findViewById(R.id.listView2);

        ArrayList<String> list = new ArrayList<>();

        for(int i=0; i<100; i++){

            list.add("Instance Position : "+i + "#      Instance Size Number : "+(i+1));
        }



        CustomAdapter customAdapter = new CustomAdapter(mContext, R.layout.custom_list_item, list );

        listView2.setAdapter(customAdapter);




    }
}

activity_custom_listview. xml : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Listview_Simple.SimpleListview"
    android:orientation="vertical"
    android:layout_margin="16dp">



    <ListView
        android:fastScrollAlwaysVisible="false"
        android:scrollbars="none"
        android:layout_marginTop="20dp"
        android:id="@+id/listView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>



</LinearLayout>

custom_list_item : 

<?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:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:orientation="vertical">

        <TextView
            android:padding="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tvOne"
            android:textStyle="bold"
            android:textSize="16dp"
            android:text=";skdj;lkfa slk;dfja"
            android:textColor="@color/purple_700"/>


        <TextView
            android:padding="10dp"
            android:text="blah blah"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tvTwo"/>



    </LinearLayout>

</LinearLayout>

CustomAdapter.java : 

package first.learn.androidlearningcourse.Listview_Simple;

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

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import java.util.ArrayList;
import java.util.List;

import first.learn.androidlearningcourse.R;

public class CustomAdapter extends ArrayAdapter<String> {


    ArrayList<String> list ;
    Context mContext;

    public CustomAdapter(@NonNull Context context, int resource, @NonNull ArrayList<String> objects) {
        super(context, resource, objects);

        this.list = objects;
        this.mContext = context ;
    }



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

        View view ;

        if(convertView == null){
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.custom_list_item, null);
        }else {

            view = convertView;
        }

        TextView tvOne = (TextView)view.findViewById(R.id.tvOne);
        TextView tvTwo = (TextView)view.findViewById(R.id.tvTwo);

        if(list.size()>position){

            String s = list.get(position);
            String [] ar = s.split("#");

            if(ar.length>1) {
                tvOne.setText(ar[0]);
                tvTwo.setText(ar[1]);
            }

            tvOne.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(mContext, "You Clicked On : "+ ar[0], Toast.LENGTH_SHORT).show();
                }
            });

            tvTwo.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    if(mContext instanceof  CustomListview) {

                        new AlertDialog.Builder(mContext)
                                .setTitle("You Clicked: ")
                                .setMessage(ar[1])
                                .setPositiveButton("Ok", null)
                                .create().show();
                    }

                    if(mContext instanceof  CheckInstance) {

                        new AlertDialog.Builder(mContext)
                                .setTitle("You Clicked Instance Of: ")
                                .setMessage(ar[1])
                                .setPositiveButton("Cancel", null)
                                .create().show();
                    }

                }
            });


        }



        return view ;
    }



}