Improve Search results highlighting

- remove unnecessary code
- use keyed Tag with a well known App key for preventing collisions
- fix missing Brightness Level preference key (used for highlight)

Change-Id: Ib856cc33f9058c10303d239e60a0ee4c322385a1

res/xml/display_settings.xml

@@ -19,6 +19,7 @@
         xmlns:settings="http://schemas.android.com/apk/res/com.android.settings">
 
         <com.android.settings.BrightnessPreference
+                android:key="brightness"
                 android:title="@string/brightness"
                 android:persistent="false"/>
 

src/com/android/settings/DataUsageSummary.java

@@ -360,7 +360,8 @@ public class DataUsageSummary extends HighlightingFragment implements Indexable
 
             mDataEnabled = new Switch(inflater.getContext());
             mDataEnabledView = inflatePreference(inflater, mNetworkSwitches, mDataEnabled);
-            mDataEnabledView.setTag(DATA_USAGE_ENABLE_MOBILE_KEY);
+            mDataEnabledView.setTag(R.id.preference_highlight_key,
+                    DATA_USAGE_ENABLE_MOBILE_KEY);
             mDataEnabled.setOnCheckedChangeListener(mDataEnabledListener);
             mNetworkSwitches.addView(mDataEnabledView);
 
@@ -368,7 +369,8 @@ public class DataUsageSummary extends HighlightingFragment implements Indexable
             mDisableAtLimit.setClickable(false);
             mDisableAtLimit.setFocusable(false);
             mDisableAtLimitView = inflatePreference(inflater, mNetworkSwitches, mDisableAtLimit);
-            mDisableAtLimitView.setTag(DATA_USAGE_DISABLE_MOBILE_LIMIT_KEY);
+            mDisableAtLimitView.setTag(R.id.preference_highlight_key,
+                    DATA_USAGE_DISABLE_MOBILE_LIMIT_KEY);
             mDisableAtLimitView.setClickable(true);
             mDisableAtLimitView.setFocusable(true);
             mDisableAtLimitView.setOnClickListener(mDisableAtLimitListener);
@@ -377,7 +379,7 @@ public class DataUsageSummary extends HighlightingFragment implements Indexable
 
         // bind cycle dropdown
         mCycleView = mHeader.findViewById(R.id.cycles);
-        mCycleView.setTag(DATA_USAGE_CYCLE_KEY);
+        mCycleView.setTag(R.id.preference_highlight_key, DATA_USAGE_CYCLE_KEY);
         mCycleSpinner = (Spinner) mCycleView.findViewById(R.id.cycles_spinner);
         mCycleAdapter = new CycleAdapter(context);
         mCycleSpinner.setAdapter(mCycleAdapter);

src/com/android/settings/HighlightingFragment.java

@@ -116,7 +116,7 @@ public class HighlightingFragment extends Fragment {
     }
 
     private boolean checkTag(View view, String key) {
-        final Object tag = view.getTag();
+        final Object tag = view.getTag(R.id.preference_highlight_key);
         if (tag == null || !(tag instanceof String)) {
             return false;
         }

src/com/android/settings/SettingsPreferenceFragment.java

@@ -204,19 +204,6 @@ public class SettingsPreferenceFragment extends PreferenceFragment implements Di
                     }, DELAY_HIGHLIGHT_DURATION_MILLIS);
                 }
             });
-        } else {
-            // Try locating the Preference View thru its tag
-            View preferenceView = findPreferenceViewForKey(getView(), key);
-            if (preferenceView != null ) {
-                mPreferenceHighlighted = true;
-
-                preferenceView.setBackground(highlight);
-                final int centerX = preferenceView.getWidth() / 2;
-                final int centerY = preferenceView.getHeight() / 2;
-                highlight.setHotspot(centerX, centerY);
-                preferenceView.setPressed(true);
-                preferenceView.setPressed(false);
-            }
         }
     }
 
@@ -235,33 +222,6 @@ public class SettingsPreferenceFragment extends PreferenceFragment implements Di
         return -1;
     }
 
-    private View findPreferenceViewForKey(View root, String key) {
-        if (checkTag(root, key)) {
-            return root;
-        }
-        if (root instanceof ViewGroup) {
-            final ViewGroup group = (ViewGroup) root;
-            final int count = group.getChildCount();
-            for (int n = 0; n < count; n++) {
-                final View child = group.getChildAt(n);
-                final View view = findPreferenceViewForKey(child, key);
-                if (view != null) {
-                    return view;
-                }
-            }
-        }
-        return null;
-    }
-
-    private boolean checkTag(View view, String key) {
-        final Object tag = view.getTag();
-        if (tag == null || !(tag instanceof String)) {
-            return false;
-        }
-        final String prefKey = (String) tag;
-        return (!TextUtils.isEmpty(prefKey) && prefKey.equals(key));
-    }
-
     protected void removePreference(String key) {
         Preference pref = findPreference(key);
         if (pref != null) {