Add feature flag to control battery app list.

If feature flag is on, then display the app list. Otherwise disable
it.

Bug: 70234293
Test: RunSettingsRoboTests
Change-Id: I1663f925abf95e0e4c1a46d98ca165303a76e979

src/com/android/settings/core/FeatureFlags.java

@@ -26,4 +26,5 @@ public class FeatureFlags {
     public static final String APP_INFO_V2 = "settings_app_info_v2";
     public static final String CONNECTED_DEVICE_V2 = "settings_connected_device_v2";
     public static final String BATTERY_SETTINGS_V2 = "settings_battery_v2";
+    public static final String BATTERY_DISPLAY_APP_LIST = "settings_battery_display_app_list";
 }

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

@@ -36,6 +36,7 @@ import android.support.v7.preference.PreferenceScreen;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
 import android.util.ArrayMap;
+import android.util.FeatureFlagUtils;
 import android.util.Log;
 import android.util.SparseArray;
 
@@ -45,6 +46,7 @@ import com.android.internal.os.BatteryStatsHelper;
 import com.android.internal.os.PowerProfile;
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
+import com.android.settings.core.FeatureFlags;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settings.Utils;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
@@ -149,7 +151,7 @@ public class BatteryAppListPreferenceController extends AbstractPreferenceContro
 
     @Override
     public boolean isAvailable() {
-        return false;
+        return FeatureFlagUtils.isEnabled(mContext, FeatureFlags.BATTERY_DISPLAY_APP_LIST);
     }
 
     @Override

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

@@ -27,6 +27,7 @@ import android.support.v14.preference.PreferenceFragment;
 import android.support.v7.preference.PreferenceGroup;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
+import android.util.FeatureFlagUtils;
 import android.util.SparseArray;
 
 import com.android.internal.os.BatterySipper;
@@ -34,8 +35,10 @@ import com.android.internal.os.BatteryStatsImpl;
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
 import com.android.settings.TestConfig;
+import com.android.settings.core.FeatureFlags;
 import com.android.settings.fuelgauge.anomaly.Anomaly;
 import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settings.testutils.shadow.SettingsShadowSystemProperties;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -49,7 +52,8 @@ import org.robolectric.annotation.Config;
 import java.util.List;
 
 @RunWith(RobolectricTestRunner.class)
-@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION, shadows =
+        SettingsShadowSystemProperties.class)
 public class BatteryAppListPreferenceControllerTest {
     private static final String[] PACKAGE_NAMES = {"com.app1", "com.app2"};
     private static final String KEY_APP_LIST = "app_list";
@@ -169,6 +173,7 @@ public class BatteryAppListPreferenceControllerTest {
 
     @Test
     public void testRefreshAnomalyIcon_containsAnomaly_showAnomalyIcon() {
+        FeatureFlagUtils.setEnabled(mContext, FeatureFlags.BATTERY_DISPLAY_APP_LIST, true);
         PowerGaugePreference preference = new PowerGaugePreference(mContext);
         final String key = mPreferenceController.extractKeyFromUid(UID);
         final SparseArray<List<Anomaly>> anomalySparseArray = new SparseArray<>();
@@ -201,4 +206,18 @@ public class BatteryAppListPreferenceControllerTest {
 
         assertThat(mPreferenceController.shouldHideSipper(mNormalBatterySipper)).isFalse();
     }
+
+    @Test
+    public void testIsAvailable_featureOn_returnTrue() {
+        FeatureFlagUtils.setEnabled(mContext, FeatureFlags.BATTERY_DISPLAY_APP_LIST, true);
+
+        assertThat(mPreferenceController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void testIsAvailable_featureOff_returnFalse() {
+        FeatureFlagUtils.setEnabled(mContext, FeatureFlags.BATTERY_DISPLAY_APP_LIST, false);
+
+        assertThat(mPreferenceController.isAvailable()).isFalse();
+    }
 }

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

@@ -83,7 +83,7 @@ import java.util.List;
 // TODO: Improve this test class so that it starts up the real activity and fragment.
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH,
-        sdk = TestConfig.SDK_VERSION_O,
+        sdk = TestConfig.SDK_VERSION,
         shadows = {
                 SettingsShadowResources.class,
                 SettingsShadowResources.SettingsShadowTheme.class,