<com.google.android.material.appbar.AppBarLayout
    android:layout_width="match_parent"
    android:alpha="0.7"
    android:id="@+id/bottombarAppbar"
    android:layout_height="wrap_content">

    <com.google.android.material.appbar.MaterialToolbar
        android:id="@+id/bottombarToolbar"
        app:navigationIcon="@drawable/ic_hide"
        app:title="Categories"
        app:titleTextColor="#fafafa"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize" />
</com.google.android.material.appbar.AppBarLayout>

bottombarToolbar.getTitleTextColor()

int color = ((ColorDrawable) mToolbar.getBackground()).getColor();

toolbar.setTitleTextColor(getColor(R.color.white));