part 27 : String Array, ArrayList-String, List view, Array Adapter, String To Array ( String split), Extract Specific Character From String ( String replace ) .

MainActivity.java 

package first.learn.listviewproject;

import static first.learn.listviewproject.Common.showStaticCustomDialog;
import static first.learn.listviewproject.MainActivity2.Message;

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {


    Button btnOne, btnTwo;
    TextView tvOne;
    ListView listView, listView2;
    /*
   Activity Starting  :
    */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        setTitle("Screen One ");

 

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

       


        ArrayList<String> list = new ArrayList<>();
        list.add("a");
        list.add("b");
        list.add("c");
        list.add("d");

        if(list.size()>4) {
            System.out.println("Element List  : " + list.get(4));
        }else {

            // Again Network Call :
            System.out.println("Element List  : " + list.get(3));
        }





        String [] array = {"apple", "Banana", "Cucumber", "Dragon"};

        if(array.length>4) {
            System.out.println("Element : Array : " + array[4]);
        }else {
            System.out.println("Element : Array : " + "NetWork Call Again");
        }



                /// String To Array :
        String s = "a#b#whatever#?value#ddddd#lksajdflakjsdf#kasd;lfa#";
        String [] arb = s.split("#");


        ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, arb );
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                String a = arb[position];

                new AlertDialog.Builder(MainActivity.this)
                        .setTitle("You Clicked")
                        .setMessage("Position : "+ position + " Item : "+ a)
                        .setPositiveButton("ok", null)
                        .create().show();

            }
        });



        ArrayAdapter<String> adapter2 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, list );
        listView2.setAdapter(adapter2);

        listView2.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                String a = list.get(position);

                new AlertDialog.Builder(MainActivity.this)
                        .setTitle("You Clicked")
                        .setMessage("Position : "+ position + " Item : "+ a)
                        .setPositiveButton("ok", null)
                        .create().show();

            }
        });


        //////////////////////////////


        String [] ar = s.split("\\?");
        System.out.println("Array Length: "+ ar.length);
        System.out.println("Array : "+ ar[1]);




        // Extract Specific Character From String :
        String t = "noor@gmail.com";
        String [] tx = t.split("@");
        String found = tx[0];

        System.out.println("Name : "+ found);

       String hostProvider = tx[1].replace(".com", "");
       System.out.println("Name Host : "+ hostProvider);


    }

 
}

activity_main.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=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">


   

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>




    <ListView
        android:layout_marginTop="20dp"
        android:id="@+id/listView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>



</LinearLayout>