1 files changed, 43 insertions, 11 deletions

diff --git a/core/java/android/appwidget/AppWidgetHost.java b/core/java/android/appwidget/AppWidgetHost.java
index c1ff580cbce7..37360bad73c7 100644
--- a/core/java/android/appwidget/AppWidgetHost.java
+++ b/core/java/android/appwidget/AppWidgetHost.java
@@ -16,15 +16,13 @@
 
 package android.appwidget;
 
-import java.lang.ref.WeakReference;
-import java.util.List;
-
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.app.Activity;
 import android.content.ActivityNotFoundException;
 import android.content.Context;
 import android.content.IntentSender;
+import android.content.pm.PackageManager;
 import android.os.Binder;
 import android.os.Bundle;
 import android.os.Handler;
@@ -42,6 +40,9 @@ import android.widget.RemoteViews.OnClickHandler;
 import com.android.internal.appwidget.IAppWidgetHost;
 import com.android.internal.appwidget.IAppWidgetService;
 
+import java.lang.ref.WeakReference;
+import java.util.List;
+
 /**
  * AppWidgetHost provides the interaction with the AppWidget service for apps,
  * like the home screen, that want to embed AppWidgets in their UI.
@@ -55,6 +56,7 @@ public class AppWidgetHost {
 
     final static Object sServiceLock = new Object();
     static IAppWidgetService sService;
+    static boolean sServiceInitialized = false;
     private DisplayMetrics mDisplayMetrics;
 
     private String mContextOpPackageName;
@@ -160,15 +162,21 @@ public class AppWidgetHost {
         mHandler = new UpdateHandler(looper);
         mCallbacks = new Callbacks(mHandler);
         mDisplayMetrics = context.getResources().getDisplayMetrics();
-        bindService();
+        bindService(context);
     }
 
-    private static void bindService() {
+    private static void bindService(Context context) {
         synchronized (sServiceLock) {
-            if (sService == null) {
-                IBinder b = ServiceManager.getService(Context.APPWIDGET_SERVICE);
-                sService = IAppWidgetService.Stub.asInterface(b);
+            if (sServiceInitialized) {
+                return;
             }
+            sServiceInitialized = true;
+            if (!context.getPackageManager().hasSystemFeature(
+                    PackageManager.FEATURE_APP_WIDGETS)) {
+                return;
+            }
+            IBinder b = ServiceManager.getService(Context.APPWIDGET_SERVICE);
+            sService = IAppWidgetService.Stub.asInterface(b);
         }
     }
 
@@ -177,6 +185,9 @@ public class AppWidgetHost {
      * becomes visible, i.e. from onStart() in your Activity.
      */
     public void startListening() {
+        if (sService == null) {
+            return;
+        }
         final int[] idsToUpdate;
         synchronized (mViews) {
             int N = mViews.size();
@@ -215,6 +226,9 @@ public class AppWidgetHost {
      * no longer visible, i.e. from onStop() in your Activity.
      */
     public void stopListening() {
+        if (sService == null) {
+            return;
+        }
         try {
             sService.stopListening(mContextOpPackageName, mHostId);
         }
@@ -229,6 +243,9 @@ public class AppWidgetHost {
      * @return a appWidgetId
      */
     public int allocateAppWidgetId() {
+        if (sService == null) {
+            return -1;
+        }
         try {
             return sService.allocateAppWidgetId(mContextOpPackageName, mHostId);
         }
@@ -258,6 +275,9 @@ public class AppWidgetHost {
      */
     public final void startAppWidgetConfigureActivityForResult(@NonNull Activity activity,
             int appWidgetId, int intentFlags, int requestCode, @Nullable Bundle options) {
+        if (sService == null) {
+            return;
+        }
         try {
             IntentSender intentSender = sService.createAppWidgetConfigIntentSender(
                     mContextOpPackageName, appWidgetId, intentFlags);
@@ -278,10 +298,10 @@ public class AppWidgetHost {
      * Gets a list of all the appWidgetIds that are bound to the current host
      */
     public int[] getAppWidgetIds() {
+        if (sService == null) {
+            return new int[0];
+        }
         try {
-            if (sService == null) {
-                bindService();
-            }
             return sService.getAppWidgetIdsForHost(mContextOpPackageName, mHostId);
         } catch (RemoteException e) {
             throw new RuntimeException("system server dead?", e);
@@ -292,6 +312,9 @@ public class AppWidgetHost {
      * Stop listening to changes for this AppWidget.
      */
     public void deleteAppWidgetId(int appWidgetId) {
+        if (sService == null) {
+            return;
+        }
         synchronized (mViews) {
             mViews.remove(appWidgetId);
             try {
@@ -312,6 +335,9 @@ public class AppWidgetHost {
      * </ul>
      */
     public void deleteHost() {
+        if (sService == null) {
+            return;
+        }
         try {
             sService.deleteHost(mContextOpPackageName, mHostId);
         }
@@ -329,6 +355,9 @@ public class AppWidgetHost {
      * </ul>
      */
     public static void deleteAllHosts() {
+        if (sService == null) {
+            return;
+        }
         try {
             sService.deleteAllHosts();
         }
@@ -343,6 +372,9 @@ public class AppWidgetHost {
      */
     public final AppWidgetHostView createView(Context context, int appWidgetId,
             AppWidgetProviderInfo appWidget) {
+        if (sService == null) {
+            return null;
+        }
         AppWidgetHostView view = onCreateView(context, appWidgetId, appWidget);
         view.setOnClickHandler(mOnClickHandler);
         view.setAppWidget(appWidgetId, appWidget);