Add summary for items in App Usage List in Battery page

This summary shows the active time of the app. For example
"Used for 27m".

Bug: 34467139
Test: RunSettingsRoboTests & Take screenshots
Change-Id: I0ef48427ad21be4dacd290fffb2c5d519ef58506

res/values/strings.xml

@@ -4465,6 +4465,9 @@
     <!-- Representation of a mAh value. [CHAR LIMIT=NONE] -->
     <string name="mah"><xliff:g id="number" example="30">%d</xliff:g> mAh</string>
 
+    <!-- Description for battery usage time for an app, i.e. Used for 30min. [CHAR LIMIT=60] -->
+    <string name="battery_used_for">Used for %1$s</string>
+
     <!-- Menu label for viewing battery usage since unplugged -->
     <string name="menu_stats_unplugged"><xliff:g id="unplugged">%1$s</xliff:g> since unplugged</string>
     <!-- Menu label for viewing battery usage since unplugged -->

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

@@ -31,6 +31,7 @@ import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceGroup;
 import android.text.TextUtils;
+import android.text.format.DateUtils;
 import android.util.Log;
 import android.util.SparseArray;
 import android.util.TypedValue;
@@ -45,6 +46,7 @@ import com.android.internal.os.PowerProfile;
 import com.android.settings.R;
 import com.android.settings.Settings.HighPowerApplicationsActivity;
 import com.android.settings.SettingsActivity;
+import com.android.settings.Utils;
 import com.android.settings.applications.ManageApplications;
 import com.android.settings.core.PreferenceController;
 import com.android.settings.dashboard.SummaryLoader;
@@ -331,10 +333,12 @@ public class PowerUsageSummary extends PowerUsageBase {
         final PowerProfile powerProfile = mStatsHelper.getPowerProfile();
         final BatteryStats stats = mStatsHelper.getStats();
         final double averagePower = powerProfile.getAveragePower(PowerProfile.POWER_SCREEN_FULL);
+        final Context context = getContext();
 
-        TypedValue value = new TypedValue();
-        getContext().getTheme().resolveAttribute(android.R.attr.colorControlNormal, value, true);
-        int colorControl = getContext().getColor(value.resourceId);
+        final TypedValue value = new TypedValue();
+        context.getTheme().resolveAttribute(android.R.attr.colorControlNormal, value, true);
+        final int colorControl = context.getColor(value.resourceId);
+        final String usedTime = context.getString(R.string.battery_used_for);
 
         if (averagePower >= MIN_AVERAGE_POWER_THRESHOLD_MILLI_AMP || USE_FAKE_DATA) {
             final List<BatterySipper> usageList = getCoalescedUsageList(
@@ -410,6 +414,7 @@ public class PowerUsageSummary extends PowerUsageBase {
                 pref.setTitle(entry.getLabel());
                 pref.setOrder(i + 1);
                 pref.setPercent(percentOfMax, percentOfTotal);
+                setUsageSummary(pref, usedTime, sipper.usageTimeMs);
                 if ((sipper.drainType != DrainType.APP
                         || sipper.uidObj.getUid() == Process.ROOT_UID)
                         && sipper.drainType != DrainType.USER) {
@@ -431,6 +436,15 @@ public class PowerUsageSummary extends PowerUsageBase {
         BatteryEntry.startRequestQueue();
     }
 
+    @VisibleForTesting
+    void setUsageSummary(Preference preference, String usedTimePrefix, long usageTimeMs) {
+        // Only show summary when usage time is longer than one minute
+        if (usageTimeMs >= DateUtils.MINUTE_IN_MILLIS) {
+            preference.setSummary(String.format(usedTimePrefix,
+                    Utils.formatElapsedTime(getContext(), usageTimeMs, false)));
+        }
+    }
+
     @VisibleForTesting
     boolean shouldHideSipper(BatterySipper sipper) {
         final DrainType drainType = sipper.drainType;

tests/robotests/src/com/android/settings/UtilsTest.java

@@ -6,6 +6,7 @@ import android.net.LinkAddress;
 import android.net.LinkProperties;
 import android.net.Network;
 import android.net.wifi.WifiManager;
+import android.text.format.DateUtils;
 import java.net.InetAddress;
 import org.junit.Before;
 import org.junit.Test;
@@ -71,4 +72,29 @@ public class UtilsTest {
         // Should not crash here
         assertThat(Utils.assignDefaultPhoto(null, 0)).isFalse();
     }
+
+    @Test
+    public void testFormatElapsedTime_WithSeconds_ShowSeconds() {
+        final double testMillis = 5 * DateUtils.MINUTE_IN_MILLIS;
+        final String expectedTime = "5m 0s";
+
+        assertThat(Utils.formatElapsedTime(mContext, testMillis, true)).isEqualTo(expectedTime);
+    }
+
+    @Test
+    public void testFormatElapsedTime_NoSeconds_DoNotShowSeconds() {
+        final double testMillis = 5 * DateUtils.MINUTE_IN_MILLIS;
+        final String expectedTime = "5m";
+
+        assertThat(Utils.formatElapsedTime(mContext, testMillis, false)).isEqualTo(expectedTime);
+    }
+
+    @Test
+    public void testFormatElapsedTime_TimeMoreThanOneDay_ShowCorrectly() {
+        final double testMillis = 2 * DateUtils.DAY_IN_MILLIS
+                + 4 * DateUtils.HOUR_IN_MILLIS + 15 * DateUtils.MINUTE_IN_MILLIS;
+        final String expectedTime = "2d 4h 15m";
+
+        assertThat(Utils.formatElapsedTime(mContext, testMillis, false)).isEqualTo(expectedTime);
+    }
 }

tests/robotests/src/com/android/settings/fuelgauge/PowerUsageSummaryTest.java

@@ -19,6 +19,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Process;
 import android.text.TextUtils;
+import android.text.format.DateUtils;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -42,7 +43,10 @@ import java.util.List;
 import static com.android.settings.fuelgauge.PowerUsageBase.MENU_STATS_REFRESH;
 import static com.android.settings.fuelgauge.PowerUsageSummary.MENU_ADDITIONAL_BATTERY_INFO;
 import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -75,6 +79,8 @@ public class PowerUsageSummaryTest {
     private BatterySipper mNormalBatterySipper;
     @Mock
     private BatterySipper mScreenBatterySipper;
+    @Mock
+    private PowerGaugePreference mPreference;
 
     private TestFragment mFragment;
     private FakeFeatureFactory mFeatureFactory;
@@ -99,8 +105,9 @@ public class PowerUsageSummaryTest {
         when(mFeatureFactory.powerUsageFeatureProvider.getAdditionalBatteryInfoIntent())
                 .thenReturn(ADDITIONAL_BATTERY_INFO_INTENT);
 
-        mPowerUsageSummary = new PowerUsageSummary();
+        mPowerUsageSummary = spy(new PowerUsageSummary());
 
+        when(mPowerUsageSummary.getContext()).thenReturn(mContext);
         when(mNormalBatterySipper.getPackages()).thenReturn(PACKAGE_NAMES);
         when(mNormalBatterySipper.getUid()).thenReturn(UID);
         mNormalBatterySipper.totalPowerMah = POWER_MAH;
@@ -207,6 +214,22 @@ public class PowerUsageSummaryTest {
         assertThat(mPowerUsageSummary.shouldHideSipper(mNormalBatterySipper)).isFalse();
     }
 
+    @Test
+    public void testSetUsageSummary_TimeLessThanOneMinute_DoNotSetSummary() {
+        final long usageTimeMs = 59 * DateUtils.SECOND_IN_MILLIS;
+
+        mPowerUsageSummary.setUsageSummary(mPreference, "", usageTimeMs);
+        verify(mPreference, never()).setSummary(anyString());
+    }
+
+    @Test
+    public void testSetUsageSummary_TimeMoreThanOneMinute_SetSummary() {
+        final long usageTimeMs = 2 * DateUtils.MINUTE_IN_MILLIS;
+
+        mPowerUsageSummary.setUsageSummary(mPreference, "", usageTimeMs);
+        verify(mPreference).setSummary(anyString());
+    }
+
     public static class TestFragment extends PowerUsageSummary {
 
         private Context mContext;