android下载图片和显示小部件的图片

Question

我尝试使用远程视图从url设置图像。这是我使用的代码。 我调试了我的代码和我的字符串

(this: String ab = (MainActivity.itemList.get(0)
                    .get(MainActivity.KEY_image)).toString();) is for example some image's url (for example,http://google.com/mypic.png)

这是我的代码：

RemoteViews views;
    int appWidgetId;
    public File file;
    public Bitmap bitmap;

    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);
        if (CLOCK_WIDGET_UPDATE.equals(intent.getAction())) {
            Toast.makeText(context, "onReceiver()", Toast.LENGTH_LONG).show();
        }
    }

    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {
        final int N = appWidgetIds.length;
        for (int i = 0; i < N; i++) {
            appWidgetId = appWidgetIds[i];

            Intent intent = new Intent(context, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
                    intent, 0);

            views = new RemoteViews(context.getPackageName(),
                    R.layout.widget_demo);
            String aa = (MainActivity.itemList.get(0)
                    .get(MainActivity.KEY_title)).toString();

            views.setOnClickPendingIntent(R.id.widgetPic, pendingIntent);

            views.setOnClickPendingIntent(R.id.widgetDesc, pendingIntent);
            views.setTextViewText(R.id.widgetDesc, aa);
            String ab = (MainActivity.itemList.get(0)
                    .get(MainActivity.KEY_image)).toString();


            views.setImageViewUri(R.id.widgetPic, Uri.parse(ab));

            // views.setImageViewBitmap(
            // R.id.widgetPic,
            // ((BitmapDrawable) context.getResources().getDrawable(
            // R.drawable.aaaaaaaaaaaaaaa)).getBitmap());

            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }

    public void updateAppWidget(Context context,
            AppWidgetManager appWidgetManager, int appWidgetId) {
        RemoteViews updateViews = new RemoteViews(context.getPackageName(),
                R.layout.widget_demo);
        try {

        } catch (Exception e) {

        }

        appWidgetManager.updateAppWidget(appWidgetId, updateViews);
    }

}

如何使用setImageViewUri显示此图片？如果有人知道解决方案，请帮助我。 感谢。