AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.chessclock.android" android:installLocation="auto"
          android:versionCode="31" android:versionName="2.12.0">
  <application android:label="@string/app_name" android:icon="@drawable/icon">
    <activity android:name=".ChessClock"
              android:label="@string/app_name"
              android:screenOrientation="portrait">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <activity android:name=".Prefs"
              android:label="@string/app_name"
              android:screenOrientation="portrait"
              android:theme="@style/android:Theme.Material">
    </activity>
    <meta-data android:name="android.max_aspect"
               android:value="2.1" />
  </application>
  <uses-sdk android:minSdkVersion="21"
            android:targetSdkVersion="27" />
</manifest>