Stability fixes for PreferenceFragments.

Unregister the click listener as early as possible, so that clicks
don't get delivered after the activity is detached.

Bug: 4599586

This should also fix: 4603030, 4601105, 4598715, 4598712.

Change-Id: I7bcff719bed14ea61b482bd6d29ae1fa5e322e41

core/java/android/preference/PreferenceFragment.java

@@ -145,7 +145,6 @@ public abstract class PreferenceFragment extends Fragment implements
         super.onCreate(savedInstanceState);
         mPreferenceManager = new PreferenceManager(getActivity(), FIRST_REQUEST_CODE);
         mPreferenceManager.setFragment(this);
-        mPreferenceManager.setOnPreferenceTreeClickListener(this);
     }
 
     @Override
@@ -177,10 +176,17 @@ public abstract class PreferenceFragment extends Fragment implements
         }
     }
 
+    @Override
+    public void onStart() {
+        super.onStart();
+        mPreferenceManager.setOnPreferenceTreeClickListener(this);
+    }
+
     @Override
     public void onStop() {
         super.onStop();
         mPreferenceManager.dispatchActivityStop();
+        mPreferenceManager.setOnPreferenceTreeClickListener(null);
     }
 
     @Override
@@ -195,7 +201,6 @@ public abstract class PreferenceFragment extends Fragment implements
     public void onDestroy() {
         super.onDestroy();
         mPreferenceManager.dispatchActivityDestroy();
-        mPreferenceManager.setOnPreferenceTreeClickListener(null);
     }
 
     @Override