ProfileList: Load fragment programmatically

This is necessary to replace it with the profile detail fragment later.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/android/ProfileActivity.java

@@ -1,6 +1,7 @@
 package com.wireguard.android;
 
 import android.app.Activity;
+import android.app.FragmentTransaction;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
@@ -35,7 +36,12 @@ public class ProfileActivity extends Activity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        // This layout consists only of containers for fragments.
         setContentView(R.layout.profile_activity);
+        // Fill the layout with the initial set of fragments.
+        FragmentTransaction transaction = getFragmentManager().beginTransaction();
+        transaction.add(R.id.list_fragment_container, new ProfileListFragment());
+        transaction.commit();
         // Ensure the long-running service is started. This only needs to happen once.
         Intent intent = new Intent(this, ProfileService.class);
         startService(intent);

app/src/main/res/layout/profile_activity.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<fragment xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/profile_list_fragment"
-    android:name="com.wireguard.android.ProfileListFragment"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/list_fragment_container"
     android:layout_width="match_parent"
     android:layout_height="match_parent" />