Add summary text for more top level setting tiles

- Connected devices
- App & notifs
- Battery

Bug: 110405144
Test: robotests
Change-Id: Ife44f7c5165483a1bad903ce90a241108ab5da25

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

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2018 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.BidiFormatter;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+
+public class TopLevelBatteryPreferenceController extends BasePreferenceController implements
+        LifecycleObserver, OnStart, OnStop {
+
+    private final BatteryBroadcastReceiver mBatteryBroadcastReceiver;
+    private Preference mPreference;
+    private BatteryInfo mBatteryInfo;
+
+    public TopLevelBatteryPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mBatteryBroadcastReceiver = new BatteryBroadcastReceiver(mContext);
+        mBatteryBroadcastReceiver.setBatteryChangedListener(type -> {
+            BatteryInfo.getBatteryInfo(mContext, info -> {
+                mBatteryInfo = info;
+                updateState(mPreference);
+            }, true /* shortString */);
+        });
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE_UNSEARCHABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public void onStart() {
+        mBatteryBroadcastReceiver.register();
+    }
+
+    @Override
+    public void onStop() {
+        mBatteryBroadcastReceiver.unRegister();
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return getDashboardLabel(mContext, mBatteryInfo);
+    }
+
+    static CharSequence getDashboardLabel(Context context, BatteryInfo info) {
+        if (info == null || context == null) {
+            return null;
+        }
+        CharSequence label;
+        final BidiFormatter formatter = BidiFormatter.getInstance();
+        if (info.remainingLabel == null) {
+            label = info.batteryPercentString;
+        } else {
+            label = context.getString(R.string.power_remaining_settings_home_page,
+                    formatter.unicodeWrap(info.batteryPercentString),
+                    formatter.unicodeWrap(info.remainingLabel));
+        }
+        return label;
+    }
+}