Disable the wifi wakeup preference when wifi scanning is disabled

Bug: 36033488
Test: Manual testing on the device, make RunSettingsRoboTests
Change-Id: I0abfe69a8a84dc9c5e78f1debce7748c92b47e04

res/values/strings.xml

@@ -1628,6 +1628,8 @@
     <string name="wifi_wakeup">Turn on Wi\u2011Fi automatically</string>
     <!-- Checkbox summary for option to enable Wi-Fi when high quality saved networks are nearby-->
     <string name="wifi_wakeup_summary">Wi\u2011Fi will turn back on near high\u2011quality saved networks, like your home network</string>
+    <!-- Checkbox summary for Wi-Fi wakeup option to explain that Wi-Fi wakeup is disabled because Wi-Fi scanning is turned off -->
+    <string name="wifi_wakeup_summary_scanning_disabled">Unavailable because Wi\u2011Fi scanning is turned off</string>
     <!-- Checkbox title for option to toggle poor network detection -->
     <string name="wifi_poor_network_detection">Avoid poor connections</string>
     <!-- Checkbox summary for option to toggle poor network detection -->

src/com/android/settings/wifi/WifiWakeupPreferenceController.java

@@ -26,6 +26,7 @@ import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
 import android.text.TextUtils;
+import com.android.settings.R;
 
 import com.android.settings.core.PreferenceController;
 import com.android.settings.core.lifecycle.Lifecycle;
@@ -97,10 +98,20 @@ public class WifiWakeupPreferenceController extends PreferenceController impleme
             return;
         }
         final SwitchPreference enableWifiWakeup = (SwitchPreference) preference;
+
         enableWifiWakeup.setChecked(Settings.Global.getInt(mContext.getContentResolver(),
                 Settings.Global.WIFI_WAKEUP_ENABLED, 0) == 1);
-        enableWifiWakeup.setEnabled(Settings.Global.getInt(mContext.getContentResolver(),
+
-                Settings.Global.NETWORK_RECOMMENDATIONS_ENABLED, 0) == 1);
+        boolean wifiScanningEnabled = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0) == 1;
+        boolean networkRecommendationsEnabled = Settings.Global.getInt(
+                mContext.getContentResolver(),
+                Settings.Global.NETWORK_RECOMMENDATIONS_ENABLED, 0) == 1;
+        enableWifiWakeup.setEnabled(networkRecommendationsEnabled && wifiScanningEnabled);
+
+        enableWifiWakeup.setSummary(wifiScanningEnabled ?
+                R.string.wifi_wakeup_summary :
+                R.string.wifi_wakeup_summary_scanning_disabled);
     }
 
     class SettingObserver extends ContentObserver {

tests/robotests/src/com/android/settings/wifi/WifiWakeupPreferenceControllerTest.java

@@ -17,6 +17,7 @@
 package com.android.settings.wifi;
 
 import static android.provider.Settings.Global.NETWORK_RECOMMENDATIONS_ENABLED;
+import static android.provider.Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE;
 import static android.provider.Settings.Global.WIFI_WAKEUP_ENABLED;
 
 import static com.google.common.truth.Truth.assertThat;
@@ -29,6 +30,7 @@ import android.provider.Settings;
 import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.Preference;
 
+import com.android.settings.R;
 import com.android.settings.SettingsRobolectricTestRunner;
 import com.android.settings.TestConfig;
 import com.android.settings.core.lifecycle.Lifecycle;
@@ -52,6 +54,7 @@ public class WifiWakeupPreferenceControllerTest {
         MockitoAnnotations.initMocks(this);
         mContext = RuntimeEnvironment.application;
         mController = new WifiWakeupPreferenceController(mContext, mock(Lifecycle.class));
+        Settings.System.putInt(mContext.getContentResolver(), WIFI_SCAN_ALWAYS_AVAILABLE, 1);
     }
 
     @Test
@@ -95,6 +98,7 @@ public class WifiWakeupPreferenceControllerTest {
 
         verify(preference).setChecked(true);
         verify(preference).setEnabled(true);
+        verify(preference).setSummary(R.string.wifi_wakeup_summary);
     }
 
     @Test
@@ -107,5 +111,20 @@ public class WifiWakeupPreferenceControllerTest {
 
         verify(preference).setChecked(false);
         verify(preference).setEnabled(false);
+        verify(preference).setSummary(R.string.wifi_wakeup_summary);
+    }
+
+    @Test
+    public void updateState_preferenceSetUncheckedAndSetDisabledWhenWifiScanningDisabled() {
+        final SwitchPreference preference = mock(SwitchPreference.class);
+        Settings.System.putInt(mContext.getContentResolver(), NETWORK_RECOMMENDATIONS_ENABLED, 1);
+        Settings.System.putInt(mContext.getContentResolver(), WIFI_WAKEUP_ENABLED, 1);
+        Settings.System.putInt(mContext.getContentResolver(), WIFI_SCAN_ALWAYS_AVAILABLE, 0);
+
+        mController.updateState(preference);
+
+        verify(preference).setChecked(true);
+        verify(preference).setEnabled(false);
+        verify(preference).setSummary(R.string.wifi_wakeup_summary_scanning_disabled);
     }
 }