Autosizing TextViews in RecyclerView causes text size to decrease

I packaged Michael Celey's answer into a class. The parameters app:autoSizeMinTextSize, app:autoSizeMaxTextSize, app:autoSizeTextType are taken from xml.

public class AutosizingTextView extends AppCompatTextView {

    private int minTextSize;
    private int maxTextSize;
    private int granularity;

    public AutosizingTextView(Context context) {
        super(context);
        init();
    }

    public AutosizingTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public AutosizingTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        minTextSize = TextViewCompat.getAutoSizeMinTextSize(this);
        maxTextSize = TextViewCompat.getAutoSizeMaxTextSize(this);
        granularity = TextViewCompat.getAutoSizeStepGranularity(this);
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        // this method is called on every setText
        disableAutosizing();
        super.setText(text, type);
        post(this::enableAutosizing); // enable after the view is laid out and measured at max text size
    }

    private void disableAutosizing() {
        TextViewCompat.setAutoSizeTextTypeWithDefaults(this, TextViewCompat.AUTO_SIZE_TEXT_TYPE_NONE);
    }

    private void enableAutosizing() {
        TextViewCompat.setAutoSizeTextTypeUniformWithConfiguration(this,
                minTextSize, maxTextSize, granularity, TypedValue.COMPLEX_UNIT_PX);
    }
}```

Pavel Haluza's answer's approach was great. However, it didn't work, probably because he missed a line setTextSize(TypedValue.COMPLEX_UNIT_PX, maxTextSize);.

Here is my updated version:

public class MyTextView extends AppCompatTextView {

private int minTextSize;
private int maxTextSize;
private int granularity;

public MyTextView(Context context) {
    super(context);
    init();
}

public MyTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

public MyTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
}

private void init() {
    minTextSize = TextViewCompat.getAutoSizeMinTextSize(this);
    maxTextSize = TextViewCompat.getAutoSizeMaxTextSize(this);
    granularity = Math.max(1, TextViewCompat.getAutoSizeStepGranularity(this));
}

@Override
public void setText(CharSequence text, BufferType type) {
    // this method is called on every setText
    disableAutoSizing();
    setTextSize(TypedValue.COMPLEX_UNIT_PX, maxTextSize);
    super.setText(text, type);
    post(this::enableAutoSizing); // enable after the view is laid out and measured at max text size
}

private void disableAutoSizing() {
    TextViewCompat.setAutoSizeTextTypeWithDefaults(this, TextViewCompat.AUTO_SIZE_TEXT_TYPE_NONE);
}

private void enableAutoSizing() {
    TextViewCompat.setAutoSizeTextTypeUniformWithConfiguration(this,
            minTextSize, maxTextSize, granularity, TypedValue.COMPLEX_UNIT_PX);
}}

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);
    }
});

Autosizing TextViews

Android 8.0 (API level 26) allows you to instruct a TextView to let the text size expand or contract automatically to fill its layout based on the TextView's characteristics and boundaries.

Note: If you set autosizing in an XML file, it is not recommended to use the value "wrap_content" for the layout_width or layout_height attributes of a TextView. It may produce unexpected results.

You should bound height

 android:layout_height="30dp"