Make flag "showAllapps" persistent in PowerUsageSummary

This flag is used to decide whether to show all the apps
(including system app, service..) in battery settings

Handle it in onCreate() and onSaveInstanceState()

Bug: 62422948
Test: RunSettingsRoboTests
Change-Id: I30c0d6e1e25902f1192fc2564aa09d635b5e0f4f
Merged-In: I30c0d6e1e25902f1192fc2564aa09d635b5e0f4f

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

@@ -79,6 +79,7 @@ public class PowerUsageSummary extends PowerUsageBase {
     private static final boolean USE_FAKE_DATA = false;
     private static final String KEY_APP_LIST = "app_list";
     private static final String KEY_BATTERY_HEADER = "battery_header";
+    private static final String KEY_SHOW_ALL_APPS = "show_all_apps";
     private static final int MAX_ITEMS_TO_LIST = USE_FAKE_DATA ? 30 : 10;
     private static final int MIN_AVERAGE_POWER_THRESHOLD_MILLI_AMP = 10;
 
@@ -131,6 +132,7 @@ public class PowerUsageSummary extends PowerUsageBase {
 
         mBatteryUtils = BatteryUtils.getInstance(getContext());
 
+        restoreSavedInstance(icicle);
         initFeatureProvider();
     }
 
@@ -154,6 +156,12 @@ public class PowerUsageSummary extends PowerUsageBase {
         }
     }
 
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putBoolean(KEY_SHOW_ALL_APPS, mShowAllApps);
+    }
+
     @Override
     public boolean onPreferenceTreeClick(Preference preference) {
         if (KEY_BATTERY_HEADER.equals(preference.getKey())) {
@@ -262,6 +270,13 @@ public class PowerUsageSummary extends PowerUsageBase {
         }
     }
 
+    @VisibleForTesting
+    void restoreSavedInstance(Bundle savedInstance) {
+        if (savedInstance != null) {
+            mShowAllApps = savedInstance.getBoolean(KEY_SHOW_ALL_APPS, false);
+        }
+    }
+
     private void addNotAvailableMessage() {
         final String NOT_AVAILABLE = "not_available";
         Preference notAvailable = getCachedPreference(NOT_AVAILABLE);

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

@@ -15,10 +15,12 @@
  */
 package com.android.settings.fuelgauge;
 
+import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
+import android.os.Bundle;
 import android.os.PowerManager;
-import android.os.Process;
+import android.support.v7.preference.PreferenceScreen;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
 import android.view.Menu;
@@ -41,13 +43,11 @@ import com.android.settings.testutils.FakeFeatureFactory;
 import com.android.settings.testutils.shadow.SettingsShadowResources;
 import com.android.settings.testutils.shadow.ShadowDynamicIndexableContentMonitor;
 import com.android.settings.testutils.XmlTestUtils;
-import com.android.settingslib.BatteryInfo;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Answers;
-import org.mockito.Matchers;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.RuntimeEnvironment;
@@ -65,7 +65,6 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.mockito.Matchers.anyInt;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyLong;
-import static org.mockito.Matchers.anyString;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doReturn;
@@ -135,6 +134,8 @@ public class PowerUsageSummaryTest {
     private PowerManager mPowerManager;
     @Mock
     private SettingsActivity mSettingsActivity;
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
 
     private List<BatterySipper> mUsageList;
     private Context mRealContext;
@@ -420,6 +421,18 @@ public class PowerUsageSummaryTest {
         assertThat(preferenceScreenKeys).containsAllIn(preferenceKeys);
     }
 
+    @Test
+    public void testSaveInstanceState_showAllAppsRestored() {
+        Bundle bundle = new Bundle();
+        mFragment.mShowAllApps = true;
+        doReturn(mPreferenceScreen).when(mFragment).getPreferenceScreen();
+
+        mFragment.onSaveInstanceState(bundle);
+        mFragment.restoreSavedInstance(bundle);
+
+        assertThat(mFragment.mShowAllApps).isTrue();
+    }
+
     public static class TestFragment extends PowerUsageSummary {
 
         private Context mContext;