关于Widget的介绍和用法可以看这两篇博文，写的非常详细了

Android 之窗口小部件详解--App Widget http://www.cnblogs.com/skywang12345/p/3158310.html

Android 之窗口小部件高级篇--App Widget 之 RemoteViews http://www.cnblogs.com/skywang12345/p/3264991.html

上面两篇博文没有提到怎么给Widget中的ListView或者GridView中显示网络图片，而我们的项目的需求中需要Widget中的ListView填充接口获得的文字和图片，试过很多方法最后发现还是以下这种伪同步比较让人满意。

        private Map<Integer, Boolean> flags = Collections.synchronizedMap(new HashMap<Integer, Boolean>());private Bitmap mBitmap;private Handler handler = new Handler(Looper.getMainLooper());@Overridepublic RemoteViews getViewAt(final int position) { //这里初始化RemoteView，设置监听，等等....flags.put(position, false);handler.post(new Runnable() {@Overridepublic void run() {//这里用了ImageLoader，或者别的带有加载回调加载库ImageLoader.getInstance().loadImage(datas.get(position).getImgUrl, new SimpleImageLoadingListener() {@Overridepublic void onLoadingStarted(String imageUri, View view) {}@Overridepublic void onLoadingFailed(String imageUri, View view, FailReason failReason) {flags.put(position, true);}@Overridepublic void onLoadingCancelled(String imageUri, View view) {flags.put(position, true);}@Overridepublic void onLoadingComplete(String arg0, View arg1, Bitmap bitmap) {mBitmap = bitmap;flags.put(position, true);}});}});//在此一直等待获取到网络图片while (!flags.get(position)) {try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}}flags.put(position, false);if (mBitmap != null) {mRemoteViews.setImageViewBitmap(R.id.widget_item_image, mBitmap);} else {mRemoteViews.setImageViewResource(R.id.widget_item_image, R.mipmap.ic_launcher);}mBitmap = null;return mRemoteViews;}