textSize Property under Textview is not showing in my layout Editor?-CodePudding

I am begineer in Android Development. I am making a XML layout but the property of textSize not showing also the code which generated automatically when we type not generating like if we type match then studio will show match_parent that is not generating. How to solve this?

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"// this line is showing in black
    android:id="@ id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="?attr/actionBarSize">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@ id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

 <TextView
    android:layout_height="wrap_content"
android:layout_width="match_parent"/>
    
</androidx.constraintlayout.widget.ConstraintLayout>

also when I tried to drag and drop it again not showing attributes of textview like textstyle, textsize etc.

I am trying to increase my text size but the property in attributes not showing it.

CodePudding user response：

You seem to be having project and/or IDE errors. Have you tried syncing with gradle or Invalidating cache and restarting Android Studio?

CodePudding user response：

It seem to occur error, and TextView if in ConstraintLayout must be have app:layout_constraintBottom_toBottomOf property

so I suggest below code

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@ id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="?attr/actionBarSize">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@ id/nav_view"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:menu="@menu/bottom_nav_menu"/>

 <TextView
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    app:layout_constraintBottom_toBottomOf="parent"/>
    
</androidx.constraintlayout.widget.ConstraintLayout>