prevent orientation change

Author: quaap

app/src/main/AndroidManifest.xml

@@ -10,10 +10,13 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".GraphicDemonActivity"
-            android:parentActivityName=".MainActivity">
-        </activity>
-        <activity android:name=".MainActivity">
+        <activity
+            android:name=".GraphicDemonActivity"
+            android:parentActivityName=".MainActivity"
+            android:screenOrientation="portrait"/>
+        <activity
+            android:name=".MainActivity"
+            android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />