Add abnormal app page for battery settings

1. Add abnormal app page
2. Add strings for abnormal app page
3. Change AnomalyPreferenceController to open abnormal app page,
when there are more than one anomaly.
4. Add AnomalyPreference, who stores a reference of anomaly.

Also rename AnomalyPreferenceController to
AnomalySummaryPreferenceController because this controller is not
used to handle AnomalyPreference.

Following cls will add summary and icon for each abnormal app.

Bug: 37681665
Test: RunSettingsRoboTests
Change-Id: I4266f906476ff8daccd962572c8cfa99f948080a

src/com/android/settings/fuelgauge/anomaly/AnomalySummaryPreferenceController.java

@@ -0,0 +1,85 @@
+/*
+ * 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.anomaly;
+
+import android.support.annotation.VisibleForTesting;
+import android.support.v14.preference.PreferenceFragment;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.SettingsActivity;
+import com.android.settings.fuelgauge.PowerUsageAnomalyDetails;
+
+import java.util.List;
+
+/**
+ * Manager that responsible for updating high usage preference and handling preference click.
+ */
+public class AnomalySummaryPreferenceController {
+    private static final String TAG = "HighUsagePreferenceController";
+    @VisibleForTesting
+    static final String ANOMALY_KEY = "high_usage";
+    private static final int REQUEST_ANOMALY_ACTION = 0;
+    private PreferenceFragment mFragment;
+    @VisibleForTesting
+    Preference mAnomalyPreference;
+    @VisibleForTesting
+    List<Anomaly> mAnomalies;
+    private SettingsActivity mSettingsActivity;
+
+    public AnomalySummaryPreferenceController(SettingsActivity activity,
+            PreferenceFragment fragment) {
+        mFragment = fragment;
+        mSettingsActivity = activity;
+        mAnomalyPreference = mFragment.getPreferenceScreen().findPreference(ANOMALY_KEY);
+        hideHighUsagePreference();
+    }
+
+    public boolean onPreferenceTreeClick(Preference preference) {
+        if (mAnomalies != null && ANOMALY_KEY.equals(preference.getKey())) {
+            if (mAnomalies.size() == 1) {
+                final Anomaly anomaly = mAnomalies.get(0);
+                AnomalyDialogFragment dialogFragment = AnomalyDialogFragment.newInstance(anomaly);
+                dialogFragment.setTargetFragment(mFragment, REQUEST_ANOMALY_ACTION);
+                dialogFragment.show(mFragment.getFragmentManager(), TAG);
+            } else {
+                PowerUsageAnomalyDetails.startBatteryAbnormalPage(mSettingsActivity, mFragment,
+                        mAnomalies);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Update anomaly preference based on {@code anomalies}, also store a reference
+     * of {@paramref anomalies}, which would be used in {@link #onPreferenceTreeClick(Preference)}
+     *
+     * @param anomalies used to update the summary, this method will store a reference of it
+     */
+    public void updateHighUsagePreference(List<Anomaly> anomalies) {
+        mAnomalies = anomalies;
+
+        if (!mAnomalies.isEmpty()) {
+            mAnomalyPreference.setVisible(true);
+            //TODO(b/36924669): update summary for anomaly preference
+        }
+    }
+
+    public void hideHighUsagePreference() {
+        mAnomalyPreference.setVisible(false);
+    }
+}