Fix AIOOBE with root access disabled.

Page title and template array lengths got out of sync if root access was
disabled. Make sure this doesn't happen anymore by combining titles and
templates into a single list prior to filtering.

Change-Id: I069db9b9925887d6d80592eabe93b33abeaf0fe8
JIRA: CYAN-8028

1 files changed, 33 insertions, 30 deletions

diff --git a/src/com/android/settings/applications/AppOpsSummary.java b/src/com/android/settings/applications/AppOpsSummary.java
index faefb65..4ec390d 100644
--- a/src/com/android/settings/applications/AppOpsSummary.java
+++ b/src/com/android/settings/applications/AppOpsSummary.java
@@ -32,6 +32,7 @@ import android.preference.PreferenceFrameLayout;
 import android.support.v13.app.FragmentPagerAdapter;
 import android.support.v4.view.PagerTabStrip;
 import android.support.v4.view.ViewPager;
+import android.util.Pair;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -62,37 +63,35 @@ public class AppOpsSummary extends InstrumentedFragment {
     private Activity mActivity;
     private SharedPreferences mPreferences;
 
-    CharSequence[] mPageNames;
-
-    int mCurPos;
-    int mPositionOffset;
-
     @Override
     protected int getMetricsCategory() {
         return MetricsLogger.APP_OPS_SUMMARY;
     }
 
-    class MyPagerAdapter extends FragmentPagerAdapter implements ViewPager.OnPageChangeListener {
-        private AppOpsState.OpsTemplate[] mPageTemplates;
+    static class MyPagerAdapter extends FragmentPagerAdapter
+            implements ViewPager.OnPageChangeListener {
+        private List<Pair<CharSequence, AppOpsState.OpsTemplate>> mPageData;
+        private int mCurPos;
 
-        public MyPagerAdapter(FragmentManager fm, AppOpsState.OpsTemplate[] templates) {
+        public MyPagerAdapter(FragmentManager fm,
+                List<Pair<CharSequence, AppOpsState.OpsTemplate>> data) {
             super(fm);
-            mPageTemplates = templates;
+            mPageData = data;
         }
 
         @Override
         public Fragment getItem(int position) {
-            return new AppOpsCategory(mPageTemplates[mPositionOffset + position]);
+            return new AppOpsCategory(mPageData.get(position).second);
         }
 
         @Override
         public int getCount() {
-            return mPageNames.length;
+            return mPageData.size();
         }
 
         @Override
         public CharSequence getPageTitle(int position) {
-            return mPageNames[position];
+            return mPageData.get(position).first;
         }
 
         @Override
@@ -134,23 +133,24 @@ public class AppOpsSummary extends InstrumentedFragment {
         mContentContainer = container;
         mRootView = rootView;
 
-        mPageNames = getResources().getTextArray(R.array.app_ops_categories_cm);
-
-        mPositionOffset = 0;
+        CharSequence[] pageNames = getResources().getTextArray(R.array.app_ops_categories_cm);
+        AppOpsState.OpsTemplate[] templates = AppOpsState.ALL_TEMPLATES;
+        assert(pageNames.length == templates.length);
 
         int specificTab = -1;
         Bundle bundle = getArguments();
         if (bundle != null) {
-            specificTab = Arrays.asList(mPageNames).indexOf(bundle.getString("appops_tab", ""));
-            if (specificTab >= 0) {
-                mPageNames = Arrays.copyOfRange(mPageNames, specificTab, specificTab + 1);
-                mPositionOffset = specificTab;
-            }
+            specificTab = Arrays.asList(pageNames).indexOf(bundle.getString("appops_tab", ""));
+        }
+
+        List<Pair<CharSequence, AppOpsState.OpsTemplate>> pageData = new ArrayList<>();
+        for (int i = 0; i < pageNames.length; i++) {
+            pageData.add(Pair.create(pageNames[i], templates[i]));
         }
+        filterPageData(pageData, specificTab);
 
         mViewPager = (ViewPager) rootView.findViewById(R.id.pager);
-        mAdapter = new MyPagerAdapter(getChildFragmentManager(),
-                filterTemplates(AppOpsState.ALL_TEMPLATES));
+        mAdapter = new MyPagerAdapter(getChildFragmentManager(), pageData);
         mViewPager.setAdapter(mAdapter);
         mViewPager.setOnPageChangeListener(mAdapter);
         PagerTabStrip tabs = (PagerTabStrip) rootView.findViewById(R.id.tabs);
@@ -174,16 +174,19 @@ public class AppOpsSummary extends InstrumentedFragment {
         return rootView;
     }
 
-    private AppOpsState.OpsTemplate[] filterTemplates(AppOpsState.OpsTemplate[] templates) {
-        List<AppOpsState.OpsTemplate> validTemplates = new ArrayList(templates.length);
-        for (AppOpsState.OpsTemplate template : templates) {
-            if (template == AppOpsState.SU_TEMPLATE
-                    && !DevelopmentSettings.isRootForAppsEnabled()) {
-                continue;
+    private void filterPageData(List<Pair<CharSequence, AppOpsState.OpsTemplate>> data, int tab) {
+        if (tab >= 0 && tab < data.size()) {
+            Pair<CharSequence, AppOpsState.OpsTemplate> item = data.get(tab);
+            data.clear();
+            data.add(item);
+        } else if (!DevelopmentSettings.isRootForAppsEnabled()) {
+            for (Pair<CharSequence, AppOpsState.OpsTemplate> item : data) {
+                if (item.second == AppOpsState.SU_TEMPLATE) {
+                    data.remove(item);
+                    return;
+                }
             }
-            validTemplates.add(template);
         }
-        return validTemplates.toArray(new AppOpsState.OpsTemplate[0]);
     }
 
     private boolean shouldShowUserApps() {