Restart loader in onResume

We need to refresh batterystatsHelper in onResume, so we need to
call restartLoader instead of initLoader

Bug: 62237848
Test: RunSettingsRoboTests
Change-Id: I6f7e1b57b945c92d34587ca24db192600e7f797f

tests/robotests/src/com/android/settings/applications/InstalledAppDetailsTest.java

@@ -19,6 +19,7 @@ package com.android.settings.applications;
 
 import android.app.AlertDialog;
 import android.app.Fragment;
+import android.app.LoaderManager;
 import android.app.admin.DevicePolicyManager;
 import android.content.Context;
 import android.content.Intent;
@@ -27,6 +28,7 @@ import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
 import android.os.BatteryStats;
+import android.os.Bundle;
 import android.os.UserManager;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceManager;
@@ -109,8 +111,10 @@ public final class InstalledAppDetailsTest {
     private PackageManager mPackageManager;
     @Mock
     private BatteryUtils mBatteryUtils;
-    private FakeFeatureFactory mFeatureFactory;
+    @Mock
+    private LoaderManager mLoaderManager;
 
+    private FakeFeatureFactory mFeatureFactory;
     private InstalledAppDetails mAppDetail;
     private Context mShadowContext;
     private Preference mBatteryPreference;
@@ -530,6 +534,16 @@ public final class InstalledAppDetailsTest {
         verify(button).setText(R.string.disable_text);
     }
 
+    @Test
+    public void testRestartBatteryStatsLoader() {
+        doReturn(mLoaderManager).when(mAppDetail).getLoaderManager();
+
+        mAppDetail.restartBatteryStatsLoader();
+
+        verify(mLoaderManager).restartLoader(InstalledAppDetails.LOADER_BATTERY, Bundle.EMPTY,
+                mAppDetail.mBatteryCallbacks);
+    }
+
     @Implements(Utils.class)
     public static class ShadowUtils {
         @Implementation