Part 28 - For Loop, Switch-Case, Transfer Activity to Another Project

 Simple_ListView.java

package first.learn.androidlearningcourse.Listview_Simple;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;

import first.learn.androidlearningcourse.R;

public class SimpleListview extends AppCompatActivity {


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

        mContext = this;

        
        listView2 = (ListView) findViewById(R.id.listView2);
        listView2.setFastScrollEnabled(false);
        listView2.setFastScrollAlwaysVisible(false);
        listView2.setVerticalScrollBarEnabled(false);
        


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

        for (int i = 0; i < 101; i++) {
            if(i==50)
                break;
            list.add("Item : " + i);

        }


        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 :


        ArrayAdapter<String> adapter2 = new ArrayAdapter<>(mContext, 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) {


//                if (position == 0) {
//                    Toast.makeText(mContext, "Books Subject : " + position, Toast.LENGTH_SHORT).show();
//
//                } else if (position == 1) {
//                    Toast.makeText(mContext, "Books Preface : " + position, Toast.LENGTH_SHORT).show();
//
//                } else if (position==2) {
//                    Toast.makeText(mContext, "Books Chapter : " + position, Toast.LENGTH_SHORT).show();
//
//                } else if (position==3) {
//                    Toast.makeText(mContext, "Introduction Two Modern World", Toast.LENGTH_SHORT).show();
//
//                }else {
//                    Toast.makeText(mContext, "Introduction Two Modern World extra", Toast.LENGTH_SHORT).show();
//
//                }


                switch (position) {
                    case 0:
                        Toast.makeText(mContext, "Books Subject : " + position, Toast.LENGTH_SHORT).show();
                        break;
                    case 1:
                        Toast.makeText(mContext, "Books Preface : " + position, Toast.LENGTH_SHORT).show();
                        break;
                    case 2:
                        Toast.makeText(mContext, "Books Chapter : " + position, Toast.LENGTH_SHORT).show();
                        break;
                    case 3:
                        Toast.makeText(mContext, "Introduction Two Modern World", Toast.LENGTH_SHORT).show();
                        break;
                    case 100:
                        Toast.makeText(mContext, "Introduction Two Modern World extra 100", Toast.LENGTH_SHORT).show();
                        break;

                    case 101:
                        Toast.makeText(mContext, "Introduction Two Modern World extra", Toast.LENGTH_SHORT).show();
                        break;
                    default:
                        Toast.makeText(mContext, "Introduction Two Modern World Default", Toast.LENGTH_SHORT).show();
                        break;

                }


//                String a = list.get(position);
//
//                new AlertDialog.Builder(mContext)
//                        .setTitle("You Clicked")
//                        .setMessage("Position : " + position + " Item : " + a)
//                        .setPositiveButton("ok", null)
//                        .create().show();

            }
        });


    }
}

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>