Added back button to preferences ActionBar for honeycomb and later.

AndroidManifest.xml

@@ -43,7 +43,13 @@
         
         <activity
             android:name=".gui.PreferencesActivity"
-            android:label="@string/settings_title" />
+            android:label="@string/settings_title" >
+
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="com.github.nutomic.controldlna.gui.MainActivity" />
+
+        </activity>
             
 		<service android:name="org.teleal.cling.android.AndroidUpnpServiceImpl" />
   		

src/com/github/nutomic/controldlna/gui/PreferencesActivity.java

@@ -29,10 +29,13 @@ package com.github.nutomic.controldlna.gui;
 
 import android.content.Intent;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceScreen;
+import android.support.v4.app.NavUtils;
+import android.view.MenuItem;
 
 import com.github.nutomic.controldlna.R;
 
@@ -46,11 +49,28 @@ public class PreferencesActivity extends PreferenceActivity {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        // There is currently no way to get ActionBar in PreferenceActivity on pre-honeycomb with
+        // compatibility library, so we'll have to do a version check.
+        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+                getActionBar().setDisplayHomeAsUpEnabled(true);
+        }
+
         addPreferencesFromResource(R.xml.preferences);
         final PreferenceScreen screen = getPreferenceScreen();
         mContactDev = screen.findPreference(KEY_CONTACT_DEV);
     }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                NavUtils.navigateUpFromSameTask(this);
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
     @Override
     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
                                          Preference preference) {