Refresh preferences when background data switch is toggled

Change-Id: Id58f565645fc3c668b516dbd05049559afa9535e
Fixes: 64466310
Test: robotests

src/com/android/settings/datausage/AppDataUsage.java

@@ -32,6 +32,7 @@ import android.net.TrafficStats;
 import android.os.Bundle;
 import android.os.RemoteException;
 import android.os.UserHandle;
+import android.support.annotation.VisibleForTesting;
 import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceCategory;
@@ -41,6 +42,7 @@ import android.util.IconDrawableFactory;
 import android.util.Log;
 import android.view.View;
 import android.widget.AdapterView;
+
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
 import com.android.settings.applications.AppInfoBase;
@@ -234,6 +236,7 @@ public class AppDataUsage extends DataUsageBase implements Preference.OnPreferen
     public boolean onPreferenceChange(Preference preference, Object newValue) {
         if (preference == mRestrictBackground) {
             mDataSaverBackend.setIsBlacklisted(mAppItem.key, mPackageName, !(Boolean) newValue);
+            updatePrefs();
             return true;
         } else if (preference == mUnrestrictedData) {
             mDataSaverBackend.setIsWhitelisted(mAppItem.key, mPackageName, (Boolean) newValue);
@@ -253,7 +256,8 @@ public class AppDataUsage extends DataUsageBase implements Preference.OnPreferen
         return super.onPreferenceTreeClick(preference);
     }
 
-    private void updatePrefs() {
+    @VisibleForTesting
+    void updatePrefs() {
         updatePrefs(getAppRestrictBackground(), getUnrestrictData());
     }
 

tests/robotests/src/com/android/settings/datausage/AppDataUsageTest.java

@@ -17,9 +17,22 @@
 package com.android.settings.datausage;
 
 
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyBoolean;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.PreferenceManager;
 import android.support.v7.preference.PreferenceScreen;
 import android.util.ArraySet;
@@ -44,17 +57,6 @@ import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 import org.robolectric.util.ReflectionHelpers;
 
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyBoolean;
-import static org.mockito.Matchers.anyInt;
-import static org.mockito.Matchers.anyString;
-import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
-import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.spy;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION,
         shadows = ShadowEntityHeaderController.class)
@@ -128,9 +130,24 @@ public class AppDataUsageTest {
 
         mFragment.onViewCreated(new View(RuntimeEnvironment.application), new Bundle());
 
-        verify(mHeaderController)
+        verify(mHeaderController).setHasAppInfoLink(true);
-                .setHasAppInfoLink(true);
+        verify(mHeaderController).setUid(fakeUserId);
-        verify(mHeaderController)
+    }
-                .setUid(fakeUserId);
+
+    @Test
+    public void changePreference_backgroundData_shouldUpdateUI() {
+        mFragment = spy(new AppDataUsage());
+        final AppItem appItem = new AppItem(123456789);
+        final SwitchPreference pref = mock(SwitchPreference.class);
+        final DataSaverBackend dataSaverBackend = mock(DataSaverBackend.class);
+        ReflectionHelpers.setField(mFragment, "mAppItem", appItem);
+        ReflectionHelpers.setField(mFragment, "mRestrictBackground", pref);
+        ReflectionHelpers.setField(mFragment, "mDataSaverBackend", dataSaverBackend);
+
+        doNothing().when(mFragment).updatePrefs();
+
+        mFragment.onPreferenceChange(pref, true /* value */);
+
+        verify(mFragment).updatePrefs();
     }
 }