Android通知栏图标显示网络图片

Android平台提供了默认的通知栏实现，如下的代码就能实现：

NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);NotificationCompat.Builder builder = new NotificationCompat.Builder(context);builder.setContentTitle(getNotificationTitle())       .setContentText(getNotificationContent())       .setSmallIcon(iconDrawableId)       .setTicker(getNotificationContent())       .setAutoCancel(true)       .setContentIntent(pendingIntent);manager.notify(notifyTitleId, builder.build());

这种方式虽然简单，但图标不能为网络图片，因此我们需要使用自定义的方式。

刚开始想先显示通知栏，之后异步下载并图片并更新图标，但却一直不能显示网络图片，如下：

ImageRequest request = new ImageRequest(getNotificationStatusIcon(),        new Response.Listener(){            @Override            public void onResponse(Bitmap response) {                remoteView.setImageViewBitmap(iconId, response);            }        }, 0, 0, Bitmap.Config.RGB_565,        new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {             }        });

但图片获取成功了，显示无法成功。后来改变了顺序，先将图片下载了，之后再显示通知栏，居然显示正常了。

ImageRequest request = new ImageRequest(getNotificationStatusIcon(),                           new Response.Listener(){                                @Override                                public void onResponse(Bitmap response) {                                    pushCustomNotification(context, response);                                }                            }, 0, 0, Bitmap.Config.RGB_565,                            new Response.ErrorListener() {                                @Override                                public void onErrorResponse(VolleyError error) {                                    pushDefaultNotification(context);                                }                            });......private void pushCustomNotification(Context context, Bitmap icon){        Intent intent;        try {            intent = Intent.parseUri(getIntent(), 0);            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);            final int notifyTitleId = ResourceUtil.getStringId(context,"push_mail_notification_title");            NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);            NotificationCompat.Builder builder = new NotificationCompat.Builder(context);            final int iconDrawableId = ResourceUtil.getDrawableId(context, "mail_push_icon");            final int iconId = ResourceUtil.getId(context, "push_notification_icon");            final RemoteViews view = new RemoteViews(context.getPackageName(), ResourceUtil.getLayoutId(context, "layout_custom_notification"));            view.setTextViewText(ResourceUtil.getId(context, "push_notification_title"), getNotificationTitle());            view.setTextViewText(ResourceUtil.getId(context, "push_notification_content"), getNotificationContent());            view.setImageViewBitmap(iconId, icon);            builder.setCustomContentView(view)                    .setSmallIcon(iconDrawableId)                    .setTicker(getNotificationContent())                    .setAutoCancel(true)                    .setContentIntent(pendingIntent);            manager.notify(notifyTitleId+1, builder.build());        } catch (URISyntaxException e) {            e.printStackTrace();        }    }

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