Settings: Fix inflate exception on search. Dynamically replace nested fragment.

   When PrivacyGuard is opened, the parent fragment would inflate the layout
   which contained a nested fragment. This is bad behavior. Since we couldn't
   keep track of the fragments lifecycle, the fragment we instantiated during
   inflation would cause an inflate exception if and when we toggled the search
   view within the current context.

   Mitigate the crash by programmatically replacing the fragment after instantiating it once.

   AndroidRuntime
          E  FATAL EXCEPTION: main
          E  Process: com.android.settings, PID: 12372
          E  android.view.InflateException: Binary XML file line SlimRoms#21: Error inflating class fragment
          E      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
          E      at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
          E      at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
           ...
          E  Caused by: java.lang.IllegalArgumentException: Binary XML file line SlimRoms#21: Duplicate id 0x7f1001a2, tag nul
             l, or parent id 0xffffffff with another fragment for com.android.settings.privacyguard.PrivacyGuardPrefs
          E      at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2120)
          E      at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:177)
          E      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
          E      ... 25 more

Change-Id: I6820ad7d35814f150eedf91140e21c0b8e23322b

Author: Adnan Begovic

res/layout/privacy_guard_manager.xml

@@ -18,9 +18,8 @@
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
-    <fragment
+    <FrameLayout
         android:id="@+id/privacy_guard_prefs"
-        android:name="com.android.settings.privacyguard.PrivacyGuardPrefs"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
     <View

src/com/android/settings/privacyguard/PrivacyGuardManager.java

@@ -16,6 +16,7 @@
 
 package com.android.settings.privacyguard;
 
+import android.app.FragmentTransaction;
 import android.view.animation.AnimationUtils;
 import android.app.Activity;
 import android.app.AlertDialog;
@@ -84,6 +85,9 @@ public class PrivacyGuardManager extends Fragment
     private final static String LAST_LIST_POS = "last_list_pos";
     private final static String LAST_LIST_OFFSET = "last_list_offset";
 
+    // Privacy Guard Fragment
+    private final static String PRIVACY_GUARD_FRAGMENT_TAG = "privacy_guard_fragment";
+
     // holder for package data passed into the adapter
     public static final class AppInfo {
         String title;
@@ -96,21 +100,17 @@ public static final class AppInfo {
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
-
         mActivity = getActivity();
         mAppOps = (AppOpsManager)getActivity().getSystemService(Context.APP_OPS_SERVICE);
 
-        return inflater.inflate(R.layout.privacy_guard_manager, container, false);
-    }
+        View hostView = inflater.inflate(R.layout.privacy_guard_manager, container, false);
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        FragmentManager fm = getFragmentManager();
-        Fragment f = fm.findFragmentById(R.id.privacy_guard_prefs);
-        if (f != null && !fm.isDestroyed()) {
-            fm.beginTransaction().remove(f).commit();
-        }
+        Fragment privacyGuardPrefs = PrivacyGuardPrefs.newInstance();
+        FragmentTransaction fragmentTransaction = getChildFragmentManager().beginTransaction();
+        fragmentTransaction.replace(R.id.privacy_guard_prefs, privacyGuardPrefs,
+                PRIVACY_GUARD_FRAGMENT_TAG);
+        fragmentTransaction.commit();
+        return hostView;
     }
 
     @Override

src/com/android/settings/privacyguard/PrivacyGuardPrefs.java

@@ -16,15 +16,11 @@
 
 package com.android.settings.privacyguard;
 
-import android.app.Activity;
-import android.content.Context;
 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.Preference.OnPreferenceChangeListener;
-import android.preference.PreferenceScreen;
 import android.preference.SwitchPreference;
 import android.provider.Settings;
-import android.provider.Settings.SettingNotFoundException;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -44,12 +40,16 @@ public class PrivacyGuardPrefs extends SettingsPreferenceFragment implements
 
     private SwitchPreference mPrivacyGuardDefault;
 
+    public static PrivacyGuardPrefs newInstance() {
+        PrivacyGuardPrefs privacyGuardFragment = new PrivacyGuardPrefs();
+        return privacyGuardFragment;
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         addPreferencesFromResource(R.xml.privacy_guard_prefs);
-        PreferenceScreen prefSet = getPreferenceScreen();
 
         mPrivacyGuardDefault = (SwitchPreference) findPreference(KEY_PRIVACY_GUARD_DEFAULT);
         mPrivacyGuardDefault.setOnPreferenceChangeListener(this);