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/ZonePicker.java

@@ -31,6 +31,9 @@ import android.view.ViewGroup;
 import android.widget.ListView;
 import android.widget.SimpleAdapter;
 
+import com.android.internal.logging.MetricsProto;
+import com.android.settings.core.instrumentation.VisibilityLoggerMixin;
+import com.android.settings.core.instrumentation.Instrumentable;
 import com.android.settingslib.datetime.ZoneGetter;
 
 import java.util.Collections;
@@ -46,8 +49,7 @@ import java.util.TimeZone;
  * the time zone. Pressing Back without choosing from the list will not
  * result in a change in the time zone setting.
  */
-public class ZonePicker extends ListFragment {
-    private static final String TAG = "ZonePicker";
+public class ZonePicker extends ListFragment implements Instrumentable {
 
     public interface ZoneSelectionListener {
         // You can add any argument if you really need it...
@@ -56,6 +58,7 @@ public class ZonePicker extends ListFragment {
 
     private static final int MENU_TIMEZONE = Menu.FIRST+1;
     private static final int MENU_ALPHABETICAL = Menu.FIRST;
+    private final VisibilityLoggerMixin mVisibilityLoggerMixin = new VisibilityLoggerMixin(this);
 
     private boolean mSortedByTimezone;
 
@@ -132,6 +135,11 @@ public class ZonePicker extends ListFragment {
         return TimeZone.getTimeZone((String)((Map<?, ?>)item).get(ZoneGetter.KEY_ID));
     }
 
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.ZONE_PICKER;
+    }
+
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
@@ -174,6 +182,12 @@ public class ZonePicker extends ListFragment {
         }
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+        mVisibilityLoggerMixin.onResume(getActivity());
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
@@ -225,6 +239,12 @@ public class ZonePicker extends ListFragment {
         }
     }
 
+    @Override
+    public void onPause() {
+        super.onPause();
+        mVisibilityLoggerMixin.onPause(getActivity());
+    }
+
     private static class MyComparator implements Comparator<Map<?, ?>> {
         private String mSortingKey;