public class MainMenu extends AppCompatActivity {

ListView listView;
EditText editTextView;
ArrayList<Lesson> ItemModelList;
CustomAdapter customAdapter;
Button BLogout;


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


    final TextView welcomeMessage = (TextView) findViewById(R.id.tvWelcome);
    final Button BLogout = (Button) findViewById(R.id.BLogout);

    Intent intent = getIntent();
    String username = intent.getStringExtra("username");


    String message = username + " Welcome";
    welcomeMessage.setText(message);


    BLogout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent registerIntent = new Intent(MainMenu.this, Login.class);
            MainMenu.this.startActivity(registerIntent);
        }
    });

    listView = (ListView) findViewById(R.id.listview);
    editTextView = (EditText) findViewById(R.id.editTextView);
    ItemModelList = new ArrayList<Lesson>();
    customAdapter = new CustomAdapter(getApplicationContext(), ItemModelList);
    listView.setEmptyView(findViewById(R.id.empty));
    listView.setAdapter(customAdapter);
}

@SuppressLint("NewApi")
public void addValue(View v) {
    String name = editTextView.getText().toString();
    if (name.isEmpty()) {
        Toast.makeText(getApplicationContext(), "Plz enter Values",
                Toast.LENGTH_SHORT).show();
    } else {
        Lesson md = new Lesson(name);
        ItemModelList.add(md);
        customAdapter.notifyDataSetChanged();
        editTextView.setText("");


    }

}}

ublic class CustomAdapter extends BaseAdapter {
Context context;
ArrayList<Lesson> itemLessonList;
public CustomAdapter(Context context, ArrayList<Lesson> lessonList) {
    this.context = context;
    this.itemLessonList = lessonList;
}
@Override
public int getCount() {
    return itemLessonList.size();
}
@Override
public Object getItem(int position) {
    return itemLessonList.get(position);
}
@Override
public long getItemId(int position) {
    return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    convertView = null;
    if (convertView == null) {
        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        convertView = mInflater.inflate(R.layout.item, null);
        TextView tvName = (TextView) convertView.findViewById(R.id.tvName);
        ImageView imgRemove = (ImageView) convertView.findViewById(R.id.BDelete);
        Lesson m = itemLessonList.get(position);
        tvName.setText(m.getName());
        // click listener for remove button
        imgRemove.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                itemLessonList.remove(position);
                notifyDataSetChanged();
            }
        });
    }
    return convertView;
}}

public class Lesson {
String name;
public Lesson(String name) {
    this.name = name;
}

public String getName() {
    return name;
}}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/gradient">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="35dp"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:gravity="left"
    android:text="Lesson Board"
    android:textColor="@android:color/holo_blue_dark"
    android:textSize="27sp" />

<Button
    android:id="@+id/BLogout"
    android:layout_width="wrap_content"
    android:layout_height="35dp"
    android:layout_alignParentEnd="true"
    android:layout_alignParentTop="true"
    android:text="Logout"
    android:background="@android:color/holo_blue_dark"/>

<TextView
    android:id="@+id/tvWelcome"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="22dp"
    android:text="hello world"
    android:textColor="@android:color/holo_blue_dark"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentEnd="true"
    android:layout_below="@+id/tvWelcome"
    android:orientation="vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
        <EditText
            android:id="@+id/editTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Add lesson"
            android:textColor="@android:color/holo_blue_dark"
            />
        <ImageView
            android:id="@+id/imgViewAdd"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="addValue"
            android:background="@android:drawable/ic_input_add"
            />
    </LinearLayout>
    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dividerHeight="2dp"
        android:textColor="@android:color/holo_blue_dark">
    </ListView>
</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
    android:id="@+id/tvName"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:gravity="left"
    android:padding="8dp"
    android:textColor="#000000"
    android:textSize="18sp" />
<ImageView
    android:id="@+id/BDelete"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:focusable="false"
    android:background="@android:drawable/ic_delete" />