androidkotlintextviewhorizontalscrollview

Auto Scrollable Text View in Kotlin

I have been searching on this for awhile. I have textView and it is Scrollable. The issue is it doesn't scroll while text is added. I have listed all my code and photos for an example. What I am needing is the textView to auto scroll when text is typed. This will be horizontal since it is a calculator.

I have tried using cursor position, using spannable, and several things I would normally do. However this has me stumped. Maybe i have something added that is conflicting the movement. This is also done in the androidx.constraintlayout.widget.ConstraintLayout

Design

<HorizontalScrollView
        android:id="@+id/scrView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:fillViewport="true"
        android:overScrollMode="always"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@+id/tv_equation"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:layout_marginTop="8dp"
            android:maxLines="1"
            android:padding="5dp"
            android:paddingStart="20dp"
            android:paddingEnd="20dp"
            android:text="@string/tv_equation"
            android:textAlignment="textEnd"
            android:textColor="@color/white"
            android:textSize="45sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </HorizontalScrollView>

MainActivity

 binding.tvEquation.movementMethod = ScrollingMovementMethod()

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It seems to that the when the overScrollMode is called, it should auto scroll over. Maybe I am missing something?

android:overScrollMode="always"

So any advice would help.

Solution

  • Change this:

    <HorizontalScrollView......
   <TextView.......
   </TextView......
</HorizontalScrollView>

    to this:

    <EditText
        android:id="@+id/tv_equation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:layout_marginTop="8dp"
        android:inputType="text"
        android:maxLines="1"
        android:minLines="1"
        android:isScrollContainer="true"
        android:padding="5dp"
        android:paddingStart="20dp"
        android:paddingEnd="20dp"
        android:text="@string/tv_equation"
        android:textAlignment="textEnd"
        android:textColor="@color/white"
        android:textSize="45sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    And add this line in your code.

    Kotlin:

    binding.tv_equation.movementMethod = ScrollingMovementMethod()

    Java:

    EditText tv_equation = (EditText)findViewById(R.id.tv_equation); 
tv_equation.setMovementMethod(new ScrollingMovementMethod());