以下是更新appwidget的静态方法：
public static void updateAppWidget(Context context, int id, WALL_POST_DETAILS post){
try{
System.out.println("In updateAppWidget==>"+id);
AppWidgetManager mngr=AppWidgetManager.getInstance(context);
String diff=diff(post.created_time.trim());
RemoteViews views=new RemoteViews(context.getPackageName(),R.layout.widget_layout);
PendingIntent pending=PendingIntent.getActivity(context, 0, new Intent(context,ShareDialogActivity.class), 0);
views.setOnClickPendingIntent(R.id.TextView01, pending);
views.setOnClickPendingIntent(R.id.Button03, pending);
views.setTextViewText(R.id.actor_name, post.actor_name);
views.setTextViewText(R.id.actor_message, post.message);
views.setImageViewBitmap(R.id.actor_photo, post.image);
views.setTextViewText(R.id.created_time, diff);
if(post.no_of_comments>0){
views.setViewVisibility(R.id.comments_image, View.VISIBLE);
views.setViewVisibility(R.id.comment_word, View.VISIBLE);
views.setTextViewText(R.id.no_of_comments, String.valueOf(post.no_of_comments));
views.setViewVisibility(R.id.no_of_comments, View.VISIBLE);
System.out.println("No. of Comments==>"+post.no_of_comments);
}else{
views.setViewVisibility(R.id.comments_image, View.INVISIBLE);
views.setViewVisibility(R.id.comment_word, View.INVISIBLE);
views.setTextViewText(R.id.no_of_comments, String.valueOf(""));
views.setViewVisibility(R.id.no_of_comments, View.INVISIBLE);
}
if(post.no_of_likes>0){
views.setViewVisibility(R.id.likes_image, View.VISIBLE);
views.setViewVisibility(R.id.likes_word, View.VISIBLE);
views.setTextViewText(R.id.no_of_likes, String.valueOf(post.no_of_likes));
views.setViewVisibility(R.id.no_of_likes, View.VISIBLE);
}else{
views.setViewVisibility(R.id.likes_image, View.INVISIBLE);
views.setViewVisibility(R.id.likes_word, View.INVISIBLE);
views.setTextViewText(R.id.no_of_likes, String.valueOf(""));
views.setViewVisibility(R.id.no_of_likes, View.INVISIBLE);
}
Intent intent_next=new Intent(context,GetPostService.class);
Bundle b_next=new Bundle();
b_next.putInt(MyWidgetProvider.APP_WIDGET_ID, id);
b_next.putInt(MyWidgetProvider.REQUEST_CODE, MyWidgetProvider.NEXT_FB_POST);
intent_next.putExtras(b_next);
PendingIntent nextPostService=PendingIntent.getService(context, MyWidgetProvider.NEXT_FB_POST, intent_next, PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.next_button, nextPostService);
Intent intent_prev=new Intent(context,GetPostService.class);
Bundle b_prev=new Bundle();
b_prev.putInt(MyWidgetProvider.APP_WIDGET_ID, id);
b_prev.putInt(MyWidgetProvider.REQUEST_CODE, MyWidgetProvider.PREV_FB_POST);
intent_prev.putExtras(b_prev);
PendingIntent prevPostService=PendingIntent.getService(context, MyWidgetProvider.PREV_FB_POST, intent_prev, PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.prev_button, prevPostService);
Intent intent_comment=new Intent(context,FBShowCommentsActivity.class);
Bundle b_comment=new Bundle();
b_comment.putInt(MyWidgetProvider.APP_WIDGET_ID, id);
b_comment.putInt(MyWidgetProvider.REQUEST_CODE, MyWidgetProvider.SHOW_COMMENTS);
b_comment.putString(MyWidgetProvider.POST_ID, SessionStore.restoreCurrentPostId(context));
intent_comment.putExtras(b_comment);
PendingIntent fbActionActivity=PendingIntent.getActivity(context, MyWidgetProvider.SHOW_COMMENTS, intent_comment, PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.comment_word, fbActionActivity);
views.setOnClickPendingIntent(R.id.comments_image, fbActionActivity);
views.setOnClickPendingIntent(R.id.no_of_comments, fbActionActivity);
Intent intent_likes=new Intent(context,ShowLikeDialogActivity.class);
Bundle b_likes=new Bundle();
b_likes.putInt(MyWidgetProvider.APP_WIDGET_ID, id);
b_likes.putInt(MyWidgetProvider.REQUEST_CODE, MyWidgetProvider.SHOW_LIKES);
b_likes.putString(MyWidgetProvider.POST_ID, SessionStore.restoreCurrentPostId(context));
intent_likes.putExtras(b_likes);
PendingIntent fbLikesActivity=PendingIntent.getActivity(context, MyWidgetProvider.SHOW_LIKES, intent_likes, PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.likes_word, fbLikesActivity);
views.setOnClickPendingIntent(R.id.likes_image, fbLikesActivity);
views.setOnClickPendingIntent(R.id.no_of_likes, fbLikesActivity);
mngr.updateAppWidget(id, views);
}catch(Exception e){
e.printStackTrace();
System.out.println("Exception==>"+e.getMessage());
}
}
AppWidget正在从GetPostService待处理服务成功更新。在安装后第一次启动Pending Activity时，我可以成功更新小部件。但是如果我再次启动第二次，Activity正常启动，但AppWidget没有获得更新，它会抛出空指针异常。我正在从UI线程更新小部件（来自AsyncTask的onPostExecute（）方法）。
W / System.err（522）：在android.widget.RemoteViews $ ReflectionAction.writeToPa rcel（RemoteViews.java:400）W / System.err（522）：在android.widget.RemoteViews.writeToParcel（RemoteViews。 java：1012）W / System.err（522）：at com.android.internal.appwidget.IAppWidgetService $ Stub $ Proxy.updateAppWidgetIds（IAppWidgetService.java:374）W / System.err（522）：at android.appwidget。 AppWidgetManager.updateAppWidget（Ap pWidgetManager.java:246）W / System.err（522）：在android.appwidget.AppWidgetManager.updateAppWidget（Ap pWidgetManager.java:265）W / System.err（522）：at com.mobisys。 android.app_widget.MyWidgetProvider.updat eAppWidget（MyWidgetProvider.java:185）W / System.err（522）：at com.mobisys.android.app_widget.MyWidgetProvider.onRec eive（MyWidgetProvider.java:71）W / System.err（ 522）：在android.app.ActivityThread.handleReceiver（ActivityThr ead.java:1769）W / System.err（522）：在android.app.ActivityThread.access $ 2400（ActivityThread .java：117）W / System.err（ 522）：在android.app.ActivityThread $ H.handleMessage（A ctivityTh read.java:978)W / System.err（522）：at android.os.Handler.dispatchMessage（Handler.java:99）W / System.err（522）：at android.os.Looper.loop（Looper） .java：123）W / System.err（522）：在android.app.ActivityThread.main（ActivityThread.java:3 647）W / System.err（522）：at java.lang.reflect.Method.invokeNative（本地方法）W / System.err（522）：at java.lang.reflect.Method.invoke（Method.java:507)W / System.err（522）：at com.android.internal.os.ZygoteInit $ MethodAndArgsCalle r.run（ZygoteInit.java:839)W / System.err（522）：at com.android.internal.os.ZygoteInit.main（ZygoteInit.ja va：597） W / System.err（522）：at dalvik.system.NativeStart.main（Native Method）
我从Pending Activity中按照以下方式调用updateAppWidget静态方法：
MyWidgetProvider.updateAppWidget(context, mAppWidgetId, post); //context is pending Activity's instance
可能是什么问题？
提前致谢。
答案 0 :(得分：23)
我有完全相同的问题和堆栈跟踪。原因是我在setImageViewBitmap中传递了一个null的Bitmap。 答案可能为时已晚，但我认为你应该仔细检查这一行：
views.setImageViewBitmap(R.id.actor_photo, post.image);
如果我正确post.image将为null - 您应该删除此行或提供非空位图。
此致