Fix launching of specific settings.

AndroidManifest.xml

@@ -49,7 +49,8 @@
 
         <activity android:name="Settings" android:label="@string/settings_label"
                 android:taskAffinity="com.android.settings"
-                android:theme="@android:style/Theme.Holo">
+                android:theme="@android:style/Theme.Holo"
+                android:launchMode="singleTop">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <action android:name="android.settings.SETTINGS" />

src/com/android/settings/Settings.java

@@ -17,6 +17,7 @@
 package com.android.settings;
 
 import android.app.Fragment;
+import android.content.Intent;
 import android.os.Bundle;
 import android.preference.PreferenceActivity;
 
@@ -30,6 +31,32 @@ public class Settings extends PreferenceActivity implements
 
     // TODO: Update Call Settings based on airplane mode state.
 
+    /**
+     * Checks if the component name in the intent is different from the Settings class and
+     * returns the class name to load as a fragment.
+     */
+    private String getStartingFragmentClass(Intent intent) {
+        final String intentClass = intent.getComponent().getClassName();
+        if (intentClass.equals(getClass().getName())) return null;
+
+        return intentClass;
+    }
+
+    /**
+     * Override initial header when an activity-alias is causing Settings to be launched
+     * for a specific fragment encoded in the android:name parameter.
+     */
+    @Override
+    public Header onGetInitialHeader() {
+        String fragmentClass = getStartingFragmentClass(super.getIntent());
+        if (fragmentClass != null) {
+            Header header = new Header();
+            header.fragment = fragmentClass;
+            return header;
+        }
+        return super.onGetInitialHeader();
+    }
+
     /**
      * Populate the activity with the top-level headers.
      */