Add anomaly icon for PowerGaugePreference

When the app contains anomaly, we should show anomaly icon(triangle
alert).

This cl also extracts a new method refreshAppListGroup from refreshUi.
New method is used to only refresh appListGroup. Reason for this action:

1. Improve performance(partial refresh)
2. We init AnomalyLoader in refreshUi, invoke refreshUi in
onLoadFinish will create infinite loop.

Bug: 36924669
Test: RunSettingsRoboTests
Change-Id: If54c89349e21763ca714123ac6ae884bd0f6a377

tests/robotests/src/com/android/settings/fuelgauge/PowerGaugePreferenceTest.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settings.fuelgauge;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.VectorDrawable;
+import android.os.PowerManager;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import com.android.settings.R;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.core.lifecycle.Lifecycle;
+import com.android.settings.widget.MasterSwitchPreference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class PowerGaugePreferenceTest {
+    private static final String SUBTITLE = "Summary";
+    private static final String CONTENT_DESCRIPTION = "Content description";
+    private Context mContext;
+    private PowerGaugePreference mPowerGaugePreference;
+    private View mRootView;
+    private View mWidgetView;
+    private PreferenceViewHolder mPreferenceViewHolder;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = RuntimeEnvironment.application;
+        mRootView = LayoutInflater.from(mContext).inflate(R.layout.preference_material_settings,
+                null);
+        mWidgetView = LayoutInflater.from(mContext).inflate(R.layout.preference_widget_summary,
+                null);
+        ((LinearLayout) mRootView.findViewById(android.R.id.widget_frame)).addView(mWidgetView);
+        mPreferenceViewHolder = PreferenceViewHolder.createInstanceForTests(mRootView);
+
+        mPowerGaugePreference = new PowerGaugePreference(mContext);
+    }
+
+    @Test
+    public void testOnBindViewHolder_bindSubtitle() {
+        mPowerGaugePreference.setSubtitle(SUBTITLE);
+        mPowerGaugePreference.onBindViewHolder(mPreferenceViewHolder);
+
+        assertThat(((TextView) mPreferenceViewHolder.findViewById(
+                R.id.widget_summary)).getText()).isEqualTo(SUBTITLE);
+    }
+
+    @Test
+    public void testOnBindViewHolder_bindAnomalyIcon() {
+        mPowerGaugePreference.shouldShowAnomalyIcon(true);
+        mPowerGaugePreference.onBindViewHolder(mPreferenceViewHolder);
+
+        final Drawable[] drawables = ((TextView) mPreferenceViewHolder.findViewById(
+                R.id.widget_summary)).getCompoundDrawablesRelative();
+
+        assertThat(drawables[0]).isInstanceOf(VectorDrawable.class);
+    }
+
+    @Test
+    public void testOnBindViewHolder_bindContentDescription() {
+        mPowerGaugePreference.setContentDescription(CONTENT_DESCRIPTION);
+        mPowerGaugePreference.onBindViewHolder(mPreferenceViewHolder);
+
+        assertThat(mPreferenceViewHolder.findViewById(android.R.id.title).getContentDescription())
+                .isEqualTo(CONTENT_DESCRIPTION);
+    }
+}