1. Create a new project

2. Add the DBHelper.java file as follows:
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import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;

public class DBHelper extends SQLiteOpenHelper {

    public static final String DATABASE_NAME = "MyDBName.db";
    public static final String CONTACTS_TABLE_NAME = "contacts";
    public static final String CONTACTS_COLUMN_ID = "id";
    public static final String CONTACTS_COLUMN_NAME = "name";
    public static final String CONTACTS_COLUMN_EMAIL = "email";
    public static final String CONTACTS_COLUMN_STREET = "street";
    public static final String CONTACTS_COLUMN_CITY = "place";
    public static final String CONTACTS_COLUMN_PHONE = "phone";
    private HashMap hp;

    public DBHelper(Context context) {
        super(context, DATABASE_NAME , null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(
                "create table contacts " +
                        "(id integer primary key, name text,phone text,email text, street text,place text)"
        );
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS contacts");
        onCreate(db);
    }

    public boolean insertContact (String name, String phone, String email, String street,String place) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put("name", name);
        contentValues.put("phone", phone);
        contentValues.put("email", email);
        contentValues.put("street", street);
        contentValues.put("place", place);
        db.insert("contacts", null, contentValues);
        return true;
    }

    public Cursor getData(int id) {
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from contacts where id="+id+"", null );
        return res;
    }

    public int numberOfRows(){
        SQLiteDatabase db = this.getReadableDatabase();
        int numRows = (int) DatabaseUtils.queryNumEntries(db, CONTACTS_TABLE_NAME);
        return numRows;
    }

    public boolean updateContact (Integer id, String name, String phone, String email, String street,String place) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put("name", name);
        contentValues.put("phone", phone);
        contentValues.put("email", email);
        contentValues.put("street", street);
        contentValues.put("place", place);
        db.update("contacts", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
        return true;
    }

    public Integer deleteContact (Integer id) {
        SQLiteDatabase db = this.getWritableDatabase();
        return db.delete("contacts",
                "id = ? ",
                new String[] { Integer.toString(id) });
    }

    public ArrayList<String> getAllCotacts() {
        ArrayList<String> array_list = new ArrayList<String>();

        //hp = new HashMap();
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from contacts", null );
        res.moveToFirst();

        while(res.isAfterLast() == false){
            array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME)));
            res.moveToNext();
        }
        return array_list;
    }
}
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3. Change MainActivity.java 
-------------------------------------------
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

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

    public class MainActivity extends AppCompatActivity {
        public final static String EXTRA_MESSAGE = "MESSAGE";
        private ListView obj;
        DBHelper mydb;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            mydb = new DBHelper(this);
            ArrayList array_list = mydb.getAllCotacts();
            ArrayAdapter arrayAdapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1, array_list);

            obj = (ListView)findViewById(R.id.listView1);
            obj.setAdapter(arrayAdapter);
            obj.setOnItemClickListener(new OnItemClickListener(){
                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
                    // TODO Auto-generated method stub
                    int id_To_Search = arg2 + 1;

                    Bundle dataBundle = new Bundle();
                    dataBundle.putInt("id", id_To_Search);

                    Intent intent = new Intent(getApplicationContext(),DisplayContact.class);

                    intent.putExtras(dataBundle);
                    startActivity(intent);
                }
            });
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main_menu, menu);
            return true;
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item){
            super.onOptionsItemSelected(item);

            switch(item.getItemId()) {
                case R.id.item1:Bundle dataBundle = new Bundle();
                    dataBundle.putInt("id", 0);

                    Intent intent = new Intent(getApplicationContext(),DisplayContact.class);
                    intent.putExtras(dataBundle);

                    startActivity(intent);
                    return true;
                default:
                    return super.onOptionsItemSelected(item);
            }
        }

        public boolean onKeyDown(int keycode, KeyEvent event) {
            if (keycode == KeyEvent.KEYCODE_BACK) {
                moveTaskToBack(true);
            }
            return super.onKeyDown(keycode, event);
        }
    }
                  
----------------------------------------------------
4. Change Activity_Main.xml
----------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    
    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/scrollView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true">

        <ListView
            android:id="@+id/listView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true" >
        </ListView>

    </ScrollView>

</RelativeLayout>

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5. Add another activity - DisplayContact.java
---------------------------------------------------------

import android.os.Bundle;
import android.app.Activity;

import android.content.Intent;
import android.database.Cursor;

import android.view.Menu;
import android.view.View;

import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class DisplayContact extends Activity {
    private DBHelper mydb;
    TextView name ;
    TextView phone;
    TextView email;
    TextView street;
    TextView place;
    int id_To_Update = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display_contact);
        name = (TextView) findViewById(R.id.editTextName);
        phone = (TextView) findViewById(R.id.editTextPhone);
        email = (TextView) findViewById(R.id.editTextStreet);
        street = (TextView) findViewById(R.id.editTextEmail);
        place = (TextView) findViewById(R.id.editTextCity);

        mydb = new DBHelper(this);

        Bundle extras = getIntent().getExtras();
        if(extras !=null) {
            int Value = extras.getInt("id");

            if(Value>0){
                Cursor rs = mydb.getData(Value);
                id_To_Update = Value;
                rs.moveToFirst();

                String nam = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_NAME));
                String phon = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_PHONE));
                String emai = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_EMAIL));
                String stree = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_STREET));
                String plac = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_CITY));

                if (!rs.isClosed())  {
                    rs.close();
                }
                Button b = (Button)findViewById(R.id.button1);
                b.setVisibility(View.INVISIBLE);

                name.setText((CharSequence)nam);
                name.setFocusable(false);
                name.setClickable(false);

                phone.setText((CharSequence)phon);
                phone.setFocusable(false);
                phone.setClickable(false);

                email.setText((CharSequence)emai);
                email.setFocusable(false);
                email.setClickable(false);

                street.setText((CharSequence)stree);
                street.setFocusable(false);
                street.setClickable(false);

                place.setText((CharSequence)plac);
                place.setFocusable(false);
                place.setClickable(false);
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        Bundle extras = getIntent().getExtras();

        if(extras !=null) {
            int Value = extras.getInt("id");
                 getMenuInflater().inflate(R.menu.main_menu, menu);
            }
        return true;
    }

    public void run(View view) {
        Bundle extras = getIntent().getExtras();
        if(extras !=null) {
            int Value = extras.getInt("id");
            if(Value>0){
                if(mydb.updateContact(id_To_Update,name.getText().toString(),
                        phone.getText().toString(), email.getText().toString(),
                        street.getText().toString(), place.getText().toString())){
                    Toast.makeText(getApplicationContext(), "Updated", Toast.LENGTH_SHORT).show();
                    Intent intent = new Intent(getApplicationContext(),MainActivity.class);
                    startActivity(intent);
                } else{
                    Toast.makeText(getApplicationContext(), "not Updated", Toast.LENGTH_SHORT).show();
                }
            } else{
                if(mydb.insertContact(name.getText().toString(), phone.getText().toString(),
                        email.getText().toString(), street.getText().toString(),
                        place.getText().toString())){
                    Toast.makeText(getApplicationContext(), "done",
                            Toast.LENGTH_SHORT).show();
                } else{
                    Toast.makeText(getApplicationContext(), "not done",
                            Toast.LENGTH_SHORT).show();
                }
                Intent intent = new Intent(getApplicationContext(),MainActivity.class);
                startActivity(intent);
            }
        }
    }
}

---------------------------------------------------------
6. Add activity_display_contact.xml
---------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context=".DisplayContact" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="370dp">
        <EditText
            android:id="@+id/editTextName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="82dp"
            android:ems="10"
            android:inputType="text" >
        </EditText>

        <EditText
            android:id="@+id/editTextEmail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/editTextStreet"
            android:layout_below="@+id/editTextStreet"
            android:layout_marginTop="22dp"
            android:ems="10"
            android:inputType="textEmailAddress" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/editTextName"
            android:layout_alignParentLeft="true"
            android:text="name"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/editTextCity"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="28dp"
            android:onClick="run"
            android:text="save" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/editTextEmail"
            android:layout_alignLeft="@+id/textView1"
            android:text="email"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/editTextPhone"
            android:layout_alignLeft="@+id/textView1"
            android:text="phone"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@+id/editTextEmail"
            android:layout_alignLeft="@+id/textView5"
            android:text="street"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <EditText
            android:id="@+id/editTextCity"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignRight="@+id/editTextName"
            android:layout_below="@+id/editTextEmail"
            android:layout_marginTop="30dp"
            android:ems="10"
            android:inputType="text" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/editTextCity"
            android:layout_alignBottom="@+id/editTextCity"
            android:layout_alignParentLeft="true"
            android:layout_toLeftOf="@+id/editTextEmail"
            android:text="country"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <EditText
            android:id="@+id/editTextStreet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/editTextName"
            android:layout_below="@+id/editTextPhone"
            android:ems="10"
            android:inputType="text" >

            <requestFocus />
        </EditText>

        <EditText
            android:id="@+id/editTextPhone"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/editTextStreet"
            android:layout_below="@+id/editTextName"
            android:ems="10"
            android:inputType="phone|text" />

    </RelativeLayout>
</ScrollView>

--------------------------------------------------------------
7. Create the "menu" Android Resource Directly
    Create the "Menu Resource File" - main_menu.xml
--------------------------------------------------------------- 
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:id="@+id/item1"
        android:icon="@drawable/ic_launcher_background"
        android:title="Add New Item" >
    </item>

</menu>

-------------------------------------
8. Change the Android Manifest:
-------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.database" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name="com.example.database.MainActivity"
            android:label="@string/app_name" >

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

        </activity>

        <activity android:name="com.example.database.DisplayContact"/>

    </application>
</manifest>