ProfileList: Convert to a fragment

This is required for a future two-fragment tablet layout, and simplifies
the code a bit since the profile detail (view/edit) will be implemented
as fragments anyway.

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

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

@@ -0,0 +1,96 @@
+package com.wireguard.android;
+
+import android.app.Activity;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.view.Menu;
+import android.view.MenuItem;
+
+import com.wireguard.config.Profile;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Activity that allows creating/viewing/editing/deleting WireGuard profiles.
+ */
+
+public class ProfileActivity extends Activity {
+    private final ServiceConnection connection = new ProfileServiceConnection();
+    private final List<ServiceConnectionListener> listeners = new ArrayList<>();
+    private ProfileServiceInterface service;
+
+    public void addServiceConnectionListener(ServiceConnectionListener listener) {
+        listeners.add(listener);
+    }
+
+    public ProfileServiceInterface getService() {
+        return service;
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.profile_activity);
+        // Ensure the long-running service is started. This only needs to happen once.
+        Intent intent = new Intent(this, ProfileService.class);
+        startService(intent);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.main, menu);
+        return true;
+    }
+
+    public void onMenuSettings(MenuItem item) {
+
+    }
+
+    public void onProfileSelected(Profile profile) {
+
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        Intent intent = new Intent(this, ProfileService.class);
+        bindService(intent, connection, Context.BIND_AUTO_CREATE);
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        if (service != null) {
+            unbindService(connection);
+            for (ServiceConnectionListener listener : listeners)
+                listener.onServiceDisconnected();
+            service = null;
+        }
+    }
+
+    public void removeServiceConnectionListener(ServiceConnectionListener listener) {
+        listeners.remove(listener);
+    }
+
+    private class ProfileServiceConnection implements ServiceConnection {
+        @Override
+        public void onServiceConnected(ComponentName component, IBinder binder) {
+            service = (ProfileServiceInterface) binder;
+            for (ServiceConnectionListener listener : listeners)
+                listener.onServiceConnected(service);
+        }
+
+        @Override
+        public void onServiceDisconnected(ComponentName component) {
+            // This function is only called when the service crashes or goes away unexpectedly.
+            for (ServiceConnectionListener listener : listeners)
+                listener.onServiceDisconnected();
+            service = null;
+        }
+    }
+}