Autosizing TextViews in RecyclerView causes text size to decrease

Question

I am trying to use Autosizing TextViews in a RecyclerView, but when I scroll a few times the text gets so small that it's obviously not working properly.

Example of my TextView:

<android.support.v7.widget.AppCompatTextView
        android:id="@+id/textview_unit_title"
        android:layout_width="@dimen/tile_image_size"
        android:layout_height="wrap_content"
        android:maxLines="2"
        android:textSize="@dimen/medium_size"
        android:textColor="@color/color_text"
        android:paddingTop="@dimen/padding_title"
        android:layout_marginRight="2dp"
        android:layout_marginEnd="2dp"
        app:autoSizeMaxTextSize="@dimen/style_medium"
        app:autoSizeTextType="uniform"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@id/imageview_unit_icon"
        app:layout_constraintTop_toTopOf="parent"/>

Should I update this scaling somewhere else programmatically or is there another solution?

Answer 1

The issue I've seen with this is that setting your view height to be wrap_content allows the text size to get smaller, but the text will never get bigger again. This is why the documentation recommends to not use wrap_content for the view size. However, I've found that if you turn off the auto-resizing, set the text size to whatever the max is, then re-enable auto-resizing, the text size resets to the largest size and scales down as necessary.

So my view in XML would look like:

<android.support.v7.widget.AppCompatTextView
    android:id="@+id/text_title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ellipsize="end"
    android:textAllCaps="true"
    android:textColor="@android:color/white"
    android:textSize="42sp"
    app:autoSizeMinTextSize="26dp"
    app:autoSizeMaxTextSize="42dp"
    app:autoSizeTextType="none"/>

Then in my ViewHolder when I bind my text to the view:

TextView title = view.findViewById(R.id.text_title);
String titleValue = "Some Title Value";

// Turn off auto-sizing text.
TextViewCompat.setAutoSizeTextTypeWithDefaults(title, 
    TextViewCompat.AUTO_SIZE_TEXT_TYPE_NONE);

// Bump text size back up to the max value.
title.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 42);

// Set your text as normal.
title.setText(titleValue);

// Post a runnable to re-enable auto-sizing text so that it occurs
// after the view is laid out and measured at max text size.
title.post(new Runnable() {
    @Override
    public void run() {     
        TextViewCompat
            .setAutoSizeTextTypeUniformWithConfiguration(title,
                    26, 42, 1, TypedValue.COMPLEX_UNIT_DIP);
    }
});