Log visibility change for all fragments.

Bug: 30681771
Test: SettingsUnitTests

Refactor visibility logging from InstrumentedFragment into a mixin. And
apply mixin in remaining fragments.

Change-Id: Ibbb59904336254a3e4bb9e8c7d0b36e5a6bc2622

src/com/android/settings/UserDictionarySettings.java

@@ -37,13 +37,15 @@ import android.widget.SectionIndexer;
 import android.widget.SimpleCursorAdapter;
 import android.widget.TextView;
 
+import com.android.internal.logging.MetricsProto;
+import com.android.settings.core.instrumentation.VisibilityLoggerMixin;
 import com.android.settings.inputmethod.UserDictionaryAddWordContents;
 import com.android.settings.inputmethod.UserDictionarySettingsUtils;
+import com.android.settings.core.instrumentation.Instrumentable;
 
 import java.util.Locale;
 
-public class UserDictionarySettings extends ListFragment {
-    private static final String TAG = "UserDictionarySettings";
+public class UserDictionarySettings extends ListFragment implements Instrumentable {
 
     private static final String[] QUERY_PROJECTION = {
         UserDictionary.Words._ID, UserDictionary.Words.WORD, UserDictionary.Words.SHORTCUT
@@ -67,10 +69,17 @@ public class UserDictionarySettings extends ListFragment {
 
     private static final int OPTIONS_MENU_ADD = Menu.FIRST;
 
-    private Cursor mCursor;
+    private final VisibilityLoggerMixin mVisibilityLoggerMixin =
+            new VisibilityLoggerMixin(this);
 
+    private Cursor mCursor;
     protected String mLocale;
 
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.USER_DICTIONARY_SETTINGS;
+    }
+
     @Override
     public View onCreateView(
             LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
@@ -116,6 +125,12 @@ public class UserDictionarySettings extends ListFragment {
                 UserDictionarySettingsUtils.getLocaleDisplayName(getActivity(), mLocale));
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+        mVisibilityLoggerMixin.onResume(getActivity());
+    }
+
     private Cursor createCursor(final String locale) {
         // Locale can be any of:
         // - The string representation of a locale, as returned by Locale#toString()
@@ -174,6 +189,12 @@ public class UserDictionarySettings extends ListFragment {
         return false;
     }
 
+    @Override
+    public void onPause() {
+        super.onPause();
+        mVisibilityLoggerMixin.onPause(getActivity());
+    }
+
     /**
      * Add or edit a word. If editingWord is null, it's an add; otherwise, it's an edit.
      * @param editingWord the word to edit, or null if it's an add.