Much more usable sign activity

OpenPGP-Keychain/res/layout/select_secret_key_layout_fragment.xml

@@ -22,12 +22,16 @@
         android:orientation="vertical"
         android:paddingLeft="16dp" >
 
+        <!-- Has been made focusable to display error messages with setError -->
+
         <TextView
             android:id="@+id/select_secret_key_user_id"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="right"
             android:ellipsize="end"
+            android:focusable="true"
+            android:focusableInTouchMode="true"
             android:singleLine="true"
             android:text="@string/api_settings_no_key"
             android:textAppearance="?android:attr/textAppearanceMedium" />