带有 SQlite 查询的 Android 应用程序小部件

Question

我正在开发一个由服务更新的应用程序小部件，该服务从 AppWidgetProvider 类的 onUpdate() 部分开始。问题是，每当我在小部件服务中使用游标时，视图都不会添加到小部件中。如果我只是将 sql 查询/结果替换为字符串，它就可以工作。

不起作用的示例（使用 ContentProvider/SQL）：

    public class TestWidgetService extends Service {

    @Override
    public void onStart(Intent intent, int startId) {

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getApplicationContext());

        ComponentName thisWidget = new ComponentName(getApplicationContext(), TestWidget.class);

        int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);

        for (int widgetId : allWidgetIds) {

            RemoteViews remoteViews = new RemoteViews(
                    getApplicationContext().getPackageName(),
                    R.layout.test_widget
                    );

            // get items

            Uri items = Uri.parse(TestWidgetContent.CONTENT_URI + "/news/1");
            Cursor iCursor = getContentResolver().query(items, null, null, null, "ITM_TIMESTAMP DESC");
            if (iCursor == null) {
                continue;
            }
            else if (iCursor.moveToFirst()) {
                while (iCursor.isAfterLast() == false) {

                    Log.w("got", iCursor.getString(iCursor.getColumnIndex("FED_TITLE")));

                    RemoteViews item = new RemoteViews(
                            getApplicationContext().getPackageName(),
                            R.layout.test_widget_item
                    );

                    item.setTextViewText(
                            R.id.test_widget_item_feed,
                            iCursor.getString(iCursor.getColumnIndex("FED_TITLE"))
                        );

                    item.setTextViewText(
                            R.id.test_widget_item_title,
                            iCursor.getString(iCursor.getColumnIndex("ITM_TITLE"))
                        );

                    remoteViews.addView(R.id.test_widget_items, item);

                    iCursor.moveToNext();
                }
            }
            iCursor.close();


            //

            appWidgetManager.updateAppWidget(widgetId, remoteViews);
        }

        stopSelf();
        super.onStart(intent, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

此示例仅显示布局“test_widget”，没有添加视图，即使 sql 返回结果并且添加了视图。

工作示例（仅字符串）：

public class TestWidgetService extends Service {

    @Override
    public void onStart(Intent intent, int startId) {

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getApplicationContext());

        ComponentName thisWidget = new ComponentName(getApplicationContext(), TestWidget.class);

        int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);

        for (int widgetId : allWidgetIds) {

            RemoteViews remoteViews = new RemoteViews(
                    getApplicationContext().getPackageName(),
                    R.layout.test_widget
                    );

            // get items

                    RemoteViews item = new RemoteViews(
                            getApplicationContext().getPackageName(),
                            R.layout.test_widget_item
                    );

                    item.setTextViewText(
                            R.id.test_widget_item_feed,
                            "feed"
                        );

                    item.setTextViewText(
                            R.id.test_widget_item_title,
                            "title"
                        );

                    remoteViews.addView(R.id.test_widget_items, item);

            //

            appWidgetManager.updateAppWidget(widgetId, remoteViews);
        }

        stopSelf();
        super.onStart(intent, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

此工作示例显示了布局“test_widget”，其中插入了 LinearLayout id“test_widget_items”中的视图

我上周一直在尝试让此小部件使用 sql 结果，任何人都知道可能会发生什么有错吗？

Answer 1

原来是模拟器的问题，删除AVD快照并再次启动应用程序后，小部件就正常了