First try...

res/layout/activity_login.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@drawable/bg_gubben"
+    android:orientation="vertical" >
+
+    <EditText
+        android:id="@+id/tfUsername"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text"
+        android:ems="10"
+        android:hint="@string/usernameHint" >
+
+        <requestFocus />
+    </EditText>
+
+    <EditText
+        android:id="@+id/tfPassword"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ems="10"
+        android:hint="@string/passwordHint"
+        android:inputType="textPassword" />
+
+    <Button
+        android:id="@+id/btnTryLogin"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/btnLoginText" />
+
+</LinearLayout>