AutoSizing TextView

In this video we will learn, how to use the autosizing feature which was introduced with Android Oreo (API level 26). By setting autoSizeTextType to “uniform” the text can now grow and shrink in it’s size depending on it’s room in the TextView. We will also learn how to change the minTextSize, maxTextSize, granularity and how to define an array of different size steps.

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activity_main.xmlarrays.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.codinginflow.autosizingtextviewexample.MainActivity">

    <TextView
        android:layout_width="50sp"
        android:layout_height="50sp"
        android:text="Hello World!"
        app:autoSizeMaxTextSize="100sp"
        app:autoSizeMinTextSize="20sp"
        app:autoSizePresetSizes="@array/autosize_text_sizes"
        app:autoSizeTextType="uniform"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingPrefix" />

</android.support.constraint.ConstraintLayout>
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <array name="autosize_text_sizes">
        <item>10sp</item>
        <item>50sp</item>
        <item>150sp</item>
    </array>

</resources>