Update battery settings strings

1. Change "screenTime" to "lastFullChargeTime" in high usage dialog
2. Update "Background restriction" strings
3. Update footer string

Bug: 73018395
Test: RunSettingsRoboTests
Change-Id: I07c149123c4ee1a69dd81c9a9e6eaa5df69b60b4

src/com/android/settings/fuelgauge/batterytip/BatteryTipDialogFragment.java

@@ -102,7 +102,10 @@ public class BatteryTipDialogFragment extends InstrumentedDialogFragment impleme
 
                 return new AlertDialog.Builder(context)
                         .setMessage(getString(R.string.battery_tip_dialog_message,
-                                highUsageTip.getHighUsageAppList().size()))
+                                highUsageTip.getHighUsageAppList().size(),
+                                StringUtil.formatRelativeTime(context,
+                                        highUsageTip.getLastFullChargeTimeMs(),
+                                        false /* withSeconds */)))
                         .setView(view)
                         .setPositiveButton(android.R.string.ok, null)
                         .create();

src/com/android/settings/fuelgauge/batterytip/detectors/HighUsageDetector.java

@@ -63,7 +63,8 @@ public class HighUsageDetector implements BatteryTipDetector {
 
     @Override
     public BatteryTip detect() {
-        final long screenUsageTimeMs = mBatteryUtils.calculateScreenUsageTime(mBatteryStatsHelper);
+        final long lastFullChargeTimeMs = mBatteryUtils.calculateLastFullChargeTime(
+                mBatteryStatsHelper, System.currentTimeMillis());
         if (mPolicy.highUsageEnabled) {
             parseBatteryData();
             if (mDataParser.isDeviceHeavilyUsed() || mPolicy.testHighUsageTip) {
@@ -99,7 +100,7 @@ public class HighUsageDetector implements BatteryTipDetector {
             }
         }
 
-        return new HighUsageTip(screenUsageTimeMs, mHighUsageAppList);
+        return new HighUsageTip(lastFullChargeTimeMs, mHighUsageAppList);
     }
 
     @VisibleForTesting

src/com/android/settings/fuelgauge/batterytip/tips/HighUsageTip.java

@@ -26,7 +26,7 @@ import com.android.settings.R;
 import com.android.settings.fuelgauge.batterytip.AppInfo;
 
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
-import com.android.settingslib.utils.StringUtil;
+
 import java.util.List;
 
 /**
@@ -34,28 +34,28 @@ import java.util.List;
  */
 public class HighUsageTip extends BatteryTip {
 
-    private final long mScreenTimeMs;
+    private final long mLastFullChargeTimeMs;
     @VisibleForTesting
     final List<AppInfo> mHighUsageAppList;
 
-    public HighUsageTip(long screenTimeMs, List<AppInfo> appList) {
+    public HighUsageTip(long lastFullChargeTimeMs, List<AppInfo> appList) {
         super(TipType.HIGH_DEVICE_USAGE, appList.isEmpty() ? StateType.INVISIBLE : StateType.NEW,
                 true /* showDialog */);
-        mScreenTimeMs = screenTimeMs;
+        mLastFullChargeTimeMs = lastFullChargeTimeMs;
         mHighUsageAppList = appList;
     }
 
     @VisibleForTesting
     HighUsageTip(Parcel in) {
         super(in);
-        mScreenTimeMs = in.readLong();
+        mLastFullChargeTimeMs = in.readLong();
         mHighUsageAppList = in.createTypedArrayList(AppInfo.CREATOR);
     }
 
     @Override
     public void writeToParcel(Parcel dest, int flags) {
         super.writeToParcel(dest, flags);
-        dest.writeLong(mScreenTimeMs);
+        dest.writeLong(mLastFullChargeTimeMs);
         dest.writeTypedList(mHighUsageAppList);
     }
 
@@ -91,8 +91,8 @@ public class HighUsageTip extends BatteryTip {
         }
     }
 
-    public long getScreenTimeMs() {
-        return mScreenTimeMs;
+    public long getLastFullChargeTimeMs() {
+        return mLastFullChargeTimeMs;
     }
 
     public List<AppInfo> getHighUsageAppList() {