don't show keyboard when launching the activity (#1329)

Author: tobrun

app/src/main/AndroidManifest.xml

@@ -18,7 +18,7 @@
         <activity
             android:name=".example.ui.ExampleActivity"
             android:screenOrientation="portrait"
-            android:windowSoftInputMode="adjustNothing">
+            android:windowSoftInputMode="stateHidden|adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>