Add ability to see both battery estimates on long press

If the enhanced estimate is being used in battery settings
it is now possible to long press on the text to have it display
both instead of the string that is normally used.

Adds another loader to enable this since it needs both the old
and the new estimates simultaneously.

Feature is hidden behind a feature flag that only googlers will
have enabled.

Test: robotests
Bug: 38399275
Change-Id: I5caf26513baada27efd50ddb0e72d3868da47150

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

@@ -0,0 +1,68 @@
+/*
+ * 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 android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.BatteryStats;
+import android.os.SystemClock;
+import com.android.internal.os.BatteryStatsHelper;
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.utils.AsyncLoader;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DebugEstimatesLoader extends AsyncLoader<List<BatteryInfo>> {
+    private BatteryStatsHelper mStatsHelper;
+
+    public DebugEstimatesLoader(Context context, BatteryStatsHelper statsHelper) {
+        super(context);
+        mStatsHelper = statsHelper;
+    }
+
+    @Override
+    protected void onDiscardResult(List<BatteryInfo> result) {
+
+    }
+
+    @Override
+    public List<BatteryInfo> loadInBackground() {
+        Context context = getContext();
+        PowerUsageFeatureProvider powerUsageFeatureProvider =
+                FeatureFactory.getFactory(context).getPowerUsageFeatureProvider(context);
+
+        // get stuff we'll need for both BatteryInfo
+        BatteryUtils batteryUtils = BatteryUtils.getInstance(context);
+        final long elapsedRealtimeUs = batteryUtils.convertMsToUs(SystemClock.elapsedRealtime());
+        Intent batteryBroadcast = getContext().registerReceiver(null,
+                new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
+        BatteryStats stats = mStatsHelper.getStats();
+
+        BatteryInfo oldinfo = BatteryInfo.getBatteryInfoOld(getContext(), batteryBroadcast,
+                stats, elapsedRealtimeUs, false);
+
+        final long timeRemainingEnhanced = batteryUtils.convertMsToUs(
+                powerUsageFeatureProvider.getEnhancedBatteryPrediction(getContext()));
+        BatteryInfo newinfo = BatteryInfo.getBatteryInfo(getContext(), batteryBroadcast, stats,
+                elapsedRealtimeUs, false, timeRemainingEnhanced, true);
+
+        List<BatteryInfo> infos = new ArrayList<>();
+        infos.add(oldinfo);
+        infos.add(newinfo);
+        return infos;
+    }
+}