Refactor settings from activity to fragment implementation.

app/src/main/java/org/yaaic/activity/MainActivity.java

@@ -20,6 +20,8 @@ along with Yaaic.  If not, see <http://www.gnu.org/licenses/>.
  */
 package org.yaaic.activity;
 
+import android.app.Fragment;
+import android.app.FragmentTransaction;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
@@ -29,8 +31,6 @@ import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarActivity;
 import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.widget.Toolbar;
-import android.util.Log;
-import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.LinearLayout;
@@ -39,14 +39,13 @@ import android.widget.TextView;
 import org.yaaic.R;
 import org.yaaic.Yaaic;
 import org.yaaic.fragment.OverviewFragment;
+import org.yaaic.fragment.SettingsFragment;
 import org.yaaic.irc.IRCBinder;
 import org.yaaic.irc.IRCService;
 import org.yaaic.model.Extra;
 import org.yaaic.model.Server;
 import org.yaaic.model.Status;
 
-import java.util.List;
-
 /**
  * The main activity of Yaaic. We'll add, remove and replace fragments here.
  */
@@ -64,6 +63,10 @@ public class MainActivity extends ActionBarActivity implements OverviewFragment.
 
         initializeToolbar();
         initializeDrawer();
+
+        if (savedInstanceState == null) {
+            onOverview(null);
+        }
     }
 
     public void initializeToolbar() {
@@ -80,7 +83,7 @@ public class MainActivity extends ActionBarActivity implements OverviewFragment.
         LinearLayout drawerContent = (LinearLayout) findViewById(R.id.drawer_content);
 
         for (final Server server : Yaaic.getInstance().getServersAsArrayList()) {
-            TextView serverView = (TextView) getLayoutInflater().inflate(R.layout.item_navigation, drawer, false);
+            TextView serverView = (TextView) getLayoutInflater().inflate(R.layout.item_drawer_server, drawer, false);
             serverView.setText(server.getTitle());
 
             serverView.setOnClickListener(new View.OnClickListener() {
@@ -148,10 +151,20 @@ public class MainActivity extends ActionBarActivity implements OverviewFragment.
 
     }
 
+    public void onOverview(View view) {
+        switchToFragment(new OverviewFragment(), OverviewFragment.TRANSACTION_TAG);
+    }
+
     public void onSettings(View view) {
+        switchToFragment(new SettingsFragment(), SettingsFragment.TRANSACTION_TAG);
+    }
+
+    private void switchToFragment(Fragment fragment, String tag) {
         drawer.closeDrawers();
 
-        startActivity(new Intent(this, SettingsActivity.class));
+        FragmentTransaction transaction = getFragmentManager().beginTransaction();
+        transaction.replace(R.id.container, fragment, tag);
+        transaction.commit();
     }
 
     public void onAbout(View view) {

app/src/main/java/org/yaaic/fragment/OverviewFragment.java

@@ -55,6 +55,8 @@ import org.yaaic.receiver.ServerReceiver;
  * Fragment showing a list of configured servers.
  */
 public class OverviewFragment extends Fragment implements ServerListener, ServersAdapter.ClickListener, View.OnClickListener {
+    public static final String TRANSACTION_TAG = "fragment_overview";
+
     /**
      * Callback interface to be implemented by Activities using this fragment.
      */

app/src/main/java/org/yaaic/fragment/SettingsFragment.java

@@ -0,0 +1,20 @@
+package org.yaaic.fragment;
+
+import android.os.Bundle;
+import android.preference.PreferenceFragment;
+
+import org.yaaic.R;
+
+/**
+ * Fragment displaying all settings.
+ */
+public class SettingsFragment extends PreferenceFragment {
+    public static final String TRANSACTION_TAG = "fragment_settings";
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        addPreferencesFromResource(R.xml.preferences);
+    }
+}

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

@@ -36,13 +36,7 @@ along with Yaaic.  If not, see <http://www.gnu.org/licenses/>.
         <FrameLayout
             android:id="@+id/container"
             android:layout_width="match_parent"
-            android:layout_height="match_parent">
-
-            <fragment
-                android:name="org.yaaic.fragment.OverviewFragment"
-                android:layout_width="match_parent"
             android:layout_height="match_parent" />
-        </FrameLayout>
 
     </LinearLayout>