Fix Lint warnings

Author: friederbluemle

connectionclass-sample/src/main/AndroidManifest.xml

@@ -1,13 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="com.facebook.network.connectionclass.sample" >
 
     <uses-permission android:name="android.permission.INTERNET"/>
 
     <application
         android:allowBackup="true"
+        android:fullBackupContent="true"
         android:icon="@drawable/ic_launcher"
-        android:label="@string/app_name">
+        android:label="@string/app_name"
+        tools:ignore="GoogleAppIndexingWarning">
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name" >

connectionclass-sample/src/main/res/drawable-xxxhdpi/ic_launcher.png

@@ -13,14 +13,14 @@
 
     <TextView
             android:text="@string/connection_class"
-            android:textSize="20dp"
+            android:textSize="20sp"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginBottom="10dp"/>
 
     <TextView
             android:id="@+id/connection_class"
-            android:textSize="32dp"
+            android:textSize="32sp"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"/>
 
@@ -29,7 +29,6 @@
             style="?android:attr/progressBarStyleLarge"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:layout_centerHorizontal="true"
             android:layout_marginTop="15dp"
             android:visibility="gone"/>