Update ConnectedDeviceGroupController

Get the PreferenceGroup there and add/remove preference
through the callback

Also add ConnectedBluetoothDeviceUpdater which only filter
the connected device.

Bug: 69333961
Test: RunSettingsRoboTests

Change-Id: Ia2ab6b6708329227929d6fe442df3a8d45bf86f5

src/com/android/settings/connecteddevice/ConnectedDeviceDashboardFragment.java

@@ -17,27 +17,20 @@ package com.android.settings.connecteddevice;
 
 import android.app.Activity;
 import android.content.Context;
-import android.content.pm.PackageManager;
 import android.provider.SearchIndexableResource;
 import android.support.annotation.VisibleForTesting;
 
 import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
-import com.android.settings.SettingsActivity;
-import com.android.settings.bluetooth.BluetoothMasterSwitchPreferenceController;
-import com.android.settings.bluetooth.Utils;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.dashboard.SummaryLoader;
-import com.android.settings.deviceinfo.UsbBackend;
 import com.android.settings.nfc.NfcPreferenceController;
-import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.search.Indexable;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 public class ConnectedDeviceDashboardFragment extends DashboardFragment {
@@ -66,7 +59,14 @@ public class ConnectedDeviceDashboardFragment extends DashboardFragment {
 
     @Override
     protected List<AbstractPreferenceController> getPreferenceControllers(Context context) {
-        return null;
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
+        final Lifecycle lifecycle = getLifecycle();
+
+        final ConnectedDeviceGroupController connectedDeviceGroupController =
+                new ConnectedDeviceGroupController(this, lifecycle);
+        controllers.add(connectedDeviceGroupController);
+        return controllers;
+
     }
 
     @VisibleForTesting
@@ -109,19 +109,26 @@ public class ConnectedDeviceDashboardFragment extends DashboardFragment {
     /**
      * For Search.
      */
+    //TODO(b/69333961): update the index for this new fragment
     public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider() {
                 @Override
                 public List<SearchIndexableResource> getXmlResourcesToIndex(
                         Context context, boolean enabled) {
-                   return new ArrayList<>();
+                    return new ArrayList<>();
                 }
 
                 @Override
                 public List<String> getNonIndexableKeys(Context context) {
 
-
                     return new ArrayList<>();
                 }
+
+                @Override
+                public List<AbstractPreferenceController> getPreferenceControllers(
+                        Context context) {
+                    //TODO(b/69333961): update the index for controllers
+                    return super.getPreferenceControllers(context);
+                }
             };
 }

src/com/android/settings/connecteddevice/ConnectedDeviceGroupController.java

@@ -15,64 +15,95 @@
  */
 package com.android.settings.connecteddevice;
 
-import android.content.Context;
+import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceGroup;
 import android.support.v7.preference.PreferenceScreen;
-
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settings.bluetooth.BluetoothDeviceUpdater;
+import com.android.settings.bluetooth.ConnectedBluetoothDeviceUpdater;
 import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settings.dashboard.DashboardFragment;
 import com.android.settingslib.core.lifecycle.events.OnStart;
 import com.android.settingslib.core.lifecycle.events.OnStop;
 
 /**
  * Controller to maintain the {@link android.support.v7.preference.PreferenceGroup} for all
  * connected devices. It uses {@link DevicePreferenceCallback} to add/remove {@link Preference}
- *
- * TODO(b/69333961): add real impl
  */
 public class ConnectedDeviceGroupController extends AbstractPreferenceController
         implements PreferenceControllerMixin, LifecycleObserver, OnStart, OnStop,
         DevicePreferenceCallback {
-    private BluetoothDeviceUpdater mBluetoothController;
 
-    public ConnectedDeviceGroupController(Context context) {
-        super(context);
+    private static final String KEY = "connected_device_list";
+
+    @VisibleForTesting
+    PreferenceGroup mPreferenceGroup;
+    private BluetoothDeviceUpdater mBluetoothDeviceUpdater;
+
+    public ConnectedDeviceGroupController(DashboardFragment fragment, Lifecycle lifecycle) {
+        super(fragment.getContext());
+        init(lifecycle, new ConnectedBluetoothDeviceUpdater(fragment, this));
+    }
+
+    @VisibleForTesting
+    ConnectedDeviceGroupController(DashboardFragment fragment, Lifecycle lifecycle,
+            BluetoothDeviceUpdater bluetoothDeviceUpdater) {
+        super(fragment.getContext());
+        init(lifecycle, bluetoothDeviceUpdater);
     }
 
     @Override
     public void onStart() {
-        mBluetoothController.registerCallback();
+        mBluetoothDeviceUpdater.registerCallback();
     }
 
     @Override
     public void onStop() {
-        mBluetoothController.unregisterCallback();
+        mBluetoothDeviceUpdater.unregisterCallback();
     }
 
     @Override
     public void displayPreference(PreferenceScreen screen) {
-
+        super.displayPreference(screen);
+        mPreferenceGroup = (PreferenceGroup) screen.findPreference(KEY);
+        mPreferenceGroup.setVisible(false);
+        mBluetoothDeviceUpdater.setPrefContext(screen.getContext());
+        mBluetoothDeviceUpdater.forceUpdate();
     }
 
     @Override
     public boolean isAvailable() {
-        return false;
+        return true;
     }
 
     @Override
     public String getPreferenceKey() {
-        return null;
+        return KEY;
     }
 
     @Override
     public void onDeviceAdded(Preference preference) {
-
+        if (mPreferenceGroup.getPreferenceCount() == 0) {
+            mPreferenceGroup.setVisible(true);
+        }
+        mPreferenceGroup.addPreference(preference);
     }
 
     @Override
     public void onDeviceRemoved(Preference preference) {
+        mPreferenceGroup.removePreference(preference);
+        if (mPreferenceGroup.getPreferenceCount() == 0) {
+            mPreferenceGroup.setVisible(false);
+        }
+    }
 
+    private void init(Lifecycle lifecycle, BluetoothDeviceUpdater bluetoothDeviceUpdater) {
+        if (lifecycle != null) {
+            lifecycle.addObserver(this);
+        }
+        mBluetoothDeviceUpdater = bluetoothDeviceUpdater;
     }
 }