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>