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 ;
    }



}

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>

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>

part 26 - Activity Lifecycle

MainActivity.java

package first.learn.listviewproject;

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

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {


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

        setTitle("Screen One ");

        btnOne = (Button)findViewById(R.id.btnOne);
        tvOne = (TextView)findViewById(R.id.tvOne);
        btnTwo = (Button)findViewById(R.id.btnTwo);

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

                startActivity(new Intent(MainActivity.this, MainActivity2.class));
            }
        });


        btnTwo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new AlertDialog.Builder(MainActivity.this)
                        .setTitle("Alert ")
                        .setMessage("yes ")
                        .setPositiveButton("Ok", null)
                        .create().show();
            }
        });

        System.out.println("Calling Method : Oncreate - Activity 1");

    }
   @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);

        System.out.println("Calling Method : onWindowFocusChanged - Activity 1");
    }
    @Override
    protected void onStart() {
        super.onStart();

        System.out.println("Calling Method : OnStart - Activity 1");

    }



    @Override
    protected void onResume() {
        super.onResume();
        System.out.println("Calling Method : OnResume - Activity 1 ");
        tvOne.setText(Message);
    }


    /*
    Activity Closing :
     */

    @Override
    protected void onPause() {
        super.onPause();
        System.out.println("Calling Method : onPause - Activity 1");
    }


    @Override
    protected void onStop() {
        super.onStop();
        System.out.println("Calling Method : onStop - Activity 1");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        System.out.println("Calling Method : onDestroy - Activity 1");
    }
}

 

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">


    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnOne"
        android:text="Next Activity 2"/>


    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnTwo"
        android:text="Show Alert"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="25dp"
        android:id="@+id/tvOne"
        />

</LinearLayout>

ActivityMain2.Java

package first.learn.listviewproject;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.widget.EditText;

public class MainActivity2 extends AppCompatActivity {


    public  static String  Message = "";

    EditText etOne;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        setTitle("Screen 2");

        etOne = (EditText)findViewById(R.id.etOne);
        System.out.println("Calling Method : OnCreate - Activity 2");


        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {

                System.out.println("Calling Method : Post Delayed - Activity 2");

            }
        },500);

    }

    @Override
    protected void onStart() {
        super.onStart();
        System.out.println("Calling Method : OnStart - Activity 2");

    }

    @Override
    protected void onResume() {
        super.onResume();
        System.out.println("Calling Method : OnResume - Activity 2");
    }


    /*
    Activity Closing :
     */

    @Override
    protected void onPause() {
        super.onPause();
        System.out.println("Calling Method : onPause - Activity 2");
    }


    @Override
    protected void onStop() {
        super.onStop();
        System.out.println("Calling Method : onStop - Activity 2");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        System.out.println("Calling Method : onDestroy - Activity 2");
    }

    @Override
    public void onBackPressed() {


        String s = etOne.getText().toString();

        Message = s ;



        super.onBackPressed();
    }
}

Activity_main2.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=".MainActivity2"
    android:orientation="vertical"
    android:layout_margin="16dp">


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etOne"
        android:hint="Write"
        android:inputType="number"/>


</LinearLayout>