I tried following a tutorial (<https://guides.codepath.com/android/using-the-app-toolbar#custom-title-view>) on creating a custom TextView inside a Toolbar. What I want to do is have the ability to dynamically change the text inside the TextView using Java. However, the problem is that I can't and no error messages are being displayed.

**Toolbar code in XML:**

```
        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
            android:minHeight="?attr/actionBarSize"
            android:elevation="4dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

                <TextView
                    android:id="@+id/toolbarTitle"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="Test1"
                    android:textSize="16sp"
                    android:textColor="@color/textColor" />

        </androidx.appcompat.widget.Toolbar>

```

**Toolbar Java code in the Activity Class:**

```
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false);
        TextView toolbarTitle = toolbar.findViewById(R.id.toolbarTitle);

        toolbarTitle.setText("Test");

```

**Styles.xml:**

```
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorSecondary</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

```

A simple toolbarTitle.setText() should do the job but for some unknown reasons it doesn't. Even if I remove the android:text from the XML code and use setText() right after the Java code it still doesn't work.

Does this mean that TextViews inside Toolbars are immutable?

Thanks!

**Edit 1:**

So I managed to find the problem but haven't particularly found a solution. The problem is caused by the Data Binding in the activity\_main.xml file. Once the all code related to Data Binding is removed, I'm able to use setText() the way I want. Why is this causing a problem?

**activity\_main.xml:**

```
<?xml version="1.0" encoding="utf-8"?>
<layout
    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"
    tools:context=".activity.MainActivity">
    <data>
        <variable
            name="VM"
            type="com.tahmidu.app.view_model.IMainActivityNavViewModel" />
    </data>
    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorPrimary">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
            android:minHeight="?attr/actionBarSize"
            android:theme="?attr/actionBarTheme"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <TextView
                android:id="@+id/toolbarTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="@color/textColor" />

        </androidx.appcompat.widget.Toolbar>

        <FrameLayout
            android:id="@+id/audioMainFragment"
            android:name="com.tahmidu.app.fragment.AudioFragment"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/toolbar" />

        <com.google.android.material.bottomnavigation.BottomNavigationView
            android:id="@+id/bottomNavigationView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorSecondary"
            app:itemIconTint="@color/bottom_navigation_color"
            app:labelVisibilityMode="unlabeled"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:menu="@menu/bottom_navigation_main" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

```