Question

我在窗口小部件上有两个按钮可以更改窗口小部件中的某些项目，如果在手机上更改了方向，则按钮不执行任何操作。我读了http://developer.android.com/guide/topics/resources/runtime-changes.html但这都是关于活动而不是小部件。

    @Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) 
{
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget);

    Intent active = new Intent(context, TvWidget.class);
    active.setAction(ACTION_WIDGET_RECEIVER);
    mDbHelper = new DbAdapter(context);
    fillChannelList(context, appWidgetIds[appWidgetIds.length-1]);
    Set<Integer> keys = channelsImages.keySet();
    Iterator<Integer> iter = keys.iterator();
    while(iter.hasNext())  
    {
        if(channelId == 0) 
        {
            channelId = iter.next();
            break;
        }
    }
    SharedPreferences settings = context.getSharedPreferences(PREFS_NAME, 0);
    Editor edit = settings.edit();
    edit.putInt("channelId", channelId);
    edit.putInt("appWidgetIds", appWidgetIds[appWidgetIds.length-1]);
    edit.commit();
    active.putExtra("net.aerosoftware.tvvodic.appWidgetIds", appWidgetIds);
    PendingIntent actionPendingIntent = PendingIntent.getBroadcast(context, 0, active, 0);
    remoteViews.setOnClickPendingIntent(R.id.button_next, actionPendingIntent);

    Intent refresh = new Intent(context, TvWidget.class);
    refresh.setAction(ACTION_WIDGET_REFRESH);
    refresh.putExtra("net.aerosoftware.tvvodic.appWidgetIds", appWidgetIds);
    PendingIntent refreshPendingIntent = PendingIntent.getBroadcast(context, 0, refresh, 0);
    remoteViews.setOnClickPendingIntent(R.id.button_refresh, refreshPendingIntent);

    updateView(context);
    appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
    super.onUpdate(context, appWidgetManager, appWidgetIds);
}

Answer 1

我建议创建一个Service（可能在AppWidgetProvider中继承它）并覆盖onConfigurationChanged（）方法。使用该服务将允许您委派业务逻辑以由服务处理，构建和更新窗口小部件。它还允许您管理旋转。如果您正在执行任何阻塞操作，那么该服务将是一个产生Thread并将结果返回到主UI线程以避免ANR的好地方。

我建议如下：

public class MyWidget extends AppWidgetProvider
{
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
    {
        context.startService(new Intent(context, MyUpdateService.class));
    }

    public static class MyUpdateService extends Service
    {
        @Override
        public void onStart(Intent intent, int startId)
        {
            super.onStart(intent, startId);
            // Update the widget
            RemoteView remoteView = buildRemoteView(this);

            // Push update to homescreen
            pushUpdate(remoteView);

            // No more updates so stop the service and free resources
            stopSelf();
        }

        public RemoteViews buildRemoteView(Context context)
        {
            RemoteView updateView = null;

            updateView = new RemoteViews(context.getPackageName(), R.layout.my_widget_layout);
            // Your code to build and update the remote view


            return updateView;
        }

        @Override
        public void onConfigurationChanged(Configuration newConfig)
        {
            int oldOrientation = this.getResources().getConfiguration().orientation;

            if(newConfig.orientation != oldOrientation)
            {
                // Update the widget
                RemoteView remoteView = buildRemoteView(this);

                // Push update to homescreen
                pushUpdate(remoteView);
            }
        }

        private void pushUpdate(RemoteView remoteView)
        {
            ComponentName myWidget = new ComponentName(this, MyWidget.class);
            AppWidgetManager manager = AppWidgetManager.getInstance(this);
            manager.updateAppWidget(myWidget, updateViews);
        }
    }
}

另请查看此链接：http://android-developers.blogspot.com/2009/04/introducing-home-screen-widgets-and.html

此外，请务必表明您有兴趣在清单中接收有关轮换更改的通知。这样的东西会起作用：机器人：configChanges = “keyboardHidden |方向” 在清单中的服务声明中声明。

希望有所帮助！

Answer 2

每当您更新窗口小部件的外观（使用活动或广播接收器[应用小部件提供商]）时，您还必须为点击处理程序重新分配所有PendingIntents，然后正常调用updateAppWidget()。

setTextViewText()的示例：

// This will update the Widget, but cause it to
// stop working after an orientation change.
updateWidget()
{
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
remoteViews.setTextViewText(R.id.widget_text_view, "Updated widget");

appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
}


// This is the correct way to update the Widget,
// so that it works after orientation change.
updateWidget()
{
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
remoteViews.setTextViewText(R.id.widget_text_view, "Updated widget");

Intent intent = new Intent(context, MyWidgetActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, ...);
remoteViews.setOnClickPendingIntent(R.id.widget_click_button, pendingIntent);

appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
}

Answer 3

问题可能是由于Widget上有两个按钮，这会导致问题。见这里：

http://permalink.gmane.org/gmane.comp.handhelds.android.devel/98008

或

http://groups.google.com/group/android-developers/browse_thread/thread/578a4429c369c27c/273a53a96ddd10c5?lnk=gst&q=Widget+does+not+respond+when+phone+orientation+changes#273a53a96ddd10c5

但目前尚不清楚真正的解决方案是什么（不需要创建后台服务的解决方案）。

Answer 4

如果您使用

RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);

要更改远程视图对象内部特定视图的某些状态，您还需要更改其他视图，因为方向更改事件将仅记住您用于更新窗口小部件的最后一个RemoteViews对象。它将使用上次使用的RemoteViews对象重新创建窗口小部件。这就是为什么您总是需要更新RemoteViews对象内的所有视图，以及视图的所有侦听器。

其余部分将由操作系统自动处理。

在方向更改按钮后，窗口小部件没有响应

4 个答案: