[Battery usage U] Create a flag to guard battery usage features

Bug: 261800937
Fix: 261800937
Test: manual
Change-Id: I891c235228c9ca0709471b496e6f75167fd0a126

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

@@ -29,6 +29,11 @@ import java.util.Set;
  */
 public interface PowerUsageFeatureProvider {
 
+    /**
+     * Check whether the battery usage button is enabled in the battery page
+     */
+    boolean isBatteryUsageEnabled(Context context);
+
     /**
      * Check whether location setting is enabled
      */

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

@@ -65,6 +65,11 @@ public class PowerUsageFeatureProviderImpl implements PowerUsageFeatureProvider
         return false;
     }
 
+    @Override
+    public boolean isBatteryUsageEnabled(Context context) {
+        return true;
+    }
+
     @Override
     public boolean isLocationSettingEnabled(String[] packages) {
         return false;

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

@@ -255,6 +255,8 @@ public class PowerUsageSummary extends PowerUsageBase implements
     void initPreference() {
         mBatteryUsagePreference = findPreference(KEY_BATTERY_USAGE);
         mBatteryUsagePreference.setSummary(getString(R.string.advanced_battery_preference_summary));
+        mBatteryUsagePreference.setVisible(
+                mPowerFeatureProvider.isBatteryUsageEnabled(getContext()));
 
         mHelpPreference = findPreference(KEY_BATTERY_ERROR);
         mHelpPreference.setVisible(false);

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

@@ -62,6 +62,11 @@ public class PowerUsageFeatureProviderImplTest {
         mPowerFeatureProvider.mPackageManager = mPackageManager;
     }
 
+    @Test
+    public void testIsBatteryUsageEnabled_returnFalse() {
+        assertThat(mPowerFeatureProvider.isBatteryUsageEnabled(mContext)).isTrue();
+    }
+
     @Test
     public void testIsTypeSystem_uidRoot_returnTrue() {
         assertThat(mPowerFeatureProvider.isTypeSystem(Process.ROOT_UID, null)).isTrue();