Refactor Power Usage Time Page.

- Show use time category

Screenshot:
[Screen time with hint] https://screenshot.googleplex.com/3cRLrwevzw4iytb
[Background time with hint] https://screenshot.googleplex.com/zEf8PcWopCVCRZR
[without hint] https://screenshot.googleplex.com/9bao9sVd8s7VRwM
[enter from app info (without category)] https://screenshot.googleplex.com/8sozxMrq8ojadiF

Bug: 302063050
Test: Manual
Change-Id: Ic967d05a173afa76c2a958e1332dedd9f83cd687

src/com/android/settings/fuelgauge/PowerUsageTimePreference.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2023 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 android.content.Context;
+import android.text.TextUtils;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.TextView;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
+
+import com.android.settings.R;
+
+/**
+ * Custom preference for displaying the app power usage time.
+ */
+public class PowerUsageTimePreference extends Preference {
+    private static final String TAG = "PowerUsageTimePreference";
+
+    @VisibleForTesting
+    CharSequence mTimeTitle;
+    @VisibleForTesting
+    CharSequence mTimeSummary;
+    @VisibleForTesting
+    CharSequence mAnomalyHintText;
+
+    public PowerUsageTimePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setLayoutResource(R.layout.power_usage_time);
+    }
+
+    void setTimeTitle(CharSequence timeTitle) {
+        if (!TextUtils.equals(mTimeTitle, timeTitle)) {
+            mTimeTitle = timeTitle;
+            notifyChanged();
+        }
+    }
+
+    void setTimeSummary(CharSequence timeSummary) {
+        if (!TextUtils.equals(mTimeSummary, timeSummary)) {
+            mTimeSummary = timeSummary;
+            notifyChanged();
+        }
+    }
+
+    void setAnomalyHint(CharSequence anomalyHintText) {
+        if (!TextUtils.equals(mAnomalyHintText, anomalyHintText)) {
+            mAnomalyHintText = anomalyHintText;
+            notifyChanged();
+        }
+    }
+
+    private void showAnomalyHint(PreferenceViewHolder view) {
+        if (TextUtils.isEmpty(mAnomalyHintText)) {
+            return;
+        }
+        final View anomalyHintView = view.findViewById(R.id.anomaly_hints);
+        if (anomalyHintView == null) {
+            return;
+        }
+        final TextView warningInfo = anomalyHintView.findViewById(R.id.warning_info);
+        if (warningInfo == null) {
+            return;
+        }
+        warningInfo.setText(mAnomalyHintText);
+        anomalyHintView.setVisibility(View.VISIBLE);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder view) {
+        super.onBindViewHolder(view);
+
+        ((TextView) view.findViewById(R.id.time_title)).setText(mTimeTitle);
+        ((TextView) view.findViewById(R.id.time_summary)).setText(mTimeSummary);
+
+        showAnomalyHint(view);
+    }
+}