part 31 : LocalBroadCast Manager

 CustomListview.java : 

package first.learn.androidlearningcourse.Listview_Simple;

import androidx.appcompat.app.AppCompatActivity;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;

import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.Arrays;

import first.learn.androidlearningcourse.R;

public class CustomListview extends AppCompatActivity {
    ListView listView2;
    Context mContext;
    EditText etName,
    etAge,
            etAddress;
    Button btnAdd, btnListSize;

    ArrayList<String> list1 ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_custom_listview);

        mContext = this;

        etName= (EditText)findViewById(R.id.etName);
        etAge= (EditText)findViewById(R.id.etAge);
        etAddress= (EditText)findViewById(R.id.etAddress);
        btnAdd = (Button)findViewById(R.id.btnAdd);

        btnListSize = (Button)findViewById(R.id.btnListSize);







        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));
        }


        String [] array = {"Name : Noor Hossain#Age: 49#Address: Shibchar","Name : Ruhul Amin#Age: 27#Address: Munshi Ganj", "Name : Ahsanul Islam#Age: 38#Address: Rangpur" };


       // ArrayList<String> list1 = new ArrayList<>(Arrays.asList(array));

         list1 = new ArrayList<>();

        for(int i = 0; i<array.length; i++){
            list1.add(array[i]);
        }





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


        CustomAdapter customAdapter = new CustomAdapter(mContext, R.layout.custom_list_item,  list1);
        listView2.setAdapter(customAdapter);


        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = etName.getText().toString();
                String age = etAge.getText().toString();
                String address = etAddress.getText().toString();

                list1.add("Name : "+name+"#Age : "+age+ "#Address : "+address);

                //customAdapter.add("Name : "+name+"#Age : "+age+ "#Address : "+address);

                customAdapter.notifyDataSetChanged();

                btnListSize.setText("List Size : "+list1.size());

                new Handler().post(new Runnable() {
                    @Override
                    public void run() {
                        customAdapter.notifyDataSetChanged();
                    }
                });

                listView2.setSelection((list1.size()-1));


                listView2.post(new Runnable() {
                    @Override
                    public void run() {
                        listView2.setSelection((list1.size()-1));
                    }
                });

            }
        });


        btnListSize.setText("List Size : "+list1.size());
        btnListSize.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                new AlertDialog.Builder(mContext)
                        .setTitle("List Size")
                        .setMessage("List Size : "+ list1.size())
                        .create().show();
            }
        });


    }



    BroadcastReceiver adapterReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            String s = intent.getStringExtra("deleteOneData");

            if(s!=null){
                
                btnListSize.setText("List Size : "+list1.size());

                String position = intent.getStringExtra("position");

                int n = -1;

                n = Integer.parseInt(position);

                System.out.println("Deleted Position : "+ n);
            }

        }
    };


    @Override
    protected void onResume() {
        super.onResume();

        LocalBroadcastManager.getInstance(mContext).registerReceiver(adapterReceiver, new IntentFilter("RowDeleteIntent"));

    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        LocalBroadcastManager.getInstance(mContext).unregisterReceiver(adapterReceiver);

    }
}

activiti_custom_list_view.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">

    <EditText
        android:hint="Name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etName"
        />

    <EditText
        android:hint="age"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etAge"
        />

    <EditText
        android:hint="Address"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etAddress"
        />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add To List"
        android:id="@+id/btnAdd"/>


    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="List Size"
        android:id="@+id/btnListSize"/>



    <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>

customAdapter.java

package first.learn.androidlearningcourse.Listview_Simple;

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

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;

import java.util.ArrayList;

import first.learn.androidlearningcourse.R;

public class CustomAdapter extends ArrayAdapter<String> {


    ArrayList<String> mainlist = null ;
    String []  mainArray = null ;
    Context mContext;

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

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


    public CustomAdapter(@NonNull Context context, int resource, @NonNull String [] objects) {
        super(context, resource, objects);

        this.mainArray = 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);
        TextView tvThree = (TextView)view.findViewById(R.id.tvThree);
        ImageView btnDelete = (ImageView) view.findViewById(R.id.btnDelete);


        if(mainlist!=null&&mainlist.size()>position){

            tvThree.setVisibility(View.VISIBLE);
            String s = mainlist.get(position);
            String [] ar = s.split("#");

            if(ar.length>2) {
                tvOne.setText(ar[0]);
                tvTwo.setText(ar[1]);
                tvThree.setText(ar[2]);
            }

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

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

                    if(mContext instanceof  CustomListview) {

                        new AlertDialog.Builder(mContext)
                                .setTitle("Do You Really Want To Delete The Item ")
                                .setMessage(ar[1])
                                .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog, int which) {

                                        mainlist.remove(position);
                                        notifyDataSetChanged();

                                        Intent intent = new Intent("RowDeleteIntent");
                                        intent.putExtra("deleteOneData", "deleteOneData");
                                        intent.putExtra("position", String.valueOf(position) );
                                        LocalBroadcastManager.getInstance(mContext).sendBroadcast(intent);


                                    }
                                })
                                .create().show();
                    }

                    if(mContext instanceof  CheckInstance) {

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

                }
            });


        }



        if(mainArray!=null&&mainArray.length>position){
            tvThree.setVisibility(View.VISIBLE);

            String s = mainArray[position];

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

            if(ar.length>2) {
                tvOne.setText(ar[0]);
                tvTwo.setText(ar[1]);
                tvThree.setText(ar[2]);
            }


        }



        return view ;
    }



}

custom_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:orientation="vertical"
    android:layout_margin="15dp">




    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="10"
        android:orientation="horizontal"
        >
        <LinearLayout
            android:layout_weight="8"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_margin="16dp"
            android:orientation="vertical">

            <TextView
                android:padding="2dp"
                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="2dp"
                android:text="blah blah"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/tvTwo"/>

            <TextView
                android:padding="2dp"
                android:text="blah blah"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/tvThree"/>



        </LinearLayout>


        <LinearLayout

            android:gravity="center"
            android:layout_gravity="center"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/btnDelete"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@android:drawable/ic_delete"/>

        </LinearLayout>



    </LinearLayout>





</LinearLayout>