Question

我在窗口手机8中创建了一个应用程序，可以从后台任务更改锁屏图像。在运行代码时，该应用程序在模拟器和设备中运行良好。它包含launchforTest（），它每30秒更换一次锁屏。

我收到一些评论告诉说，当应用程序通过商店上传时，launchforTest（）不起作用。它主要用于测试目的。

所以我的问题是，当我从商店安装我的应用程序时，我已经进行了beta测试，后台任务不起作用，我的锁屏图像不会改变

我在代码中遗漏了哪些内容使其无效。请帮助。

这是我的代码

private ResourceIntensiveTask resourceIntensiveTask; private string resourceIntensiveTaskName =“SmartLockScreenScheduledTaskAgent”; private string resourceIntensiveTaskDescription =“显示最新的交易。”;

private StartTask()
{
    LockScreenChange("ms-appdata:///Local/Image0.jpg", true);
}

private async void LockScreenChange(string filePathOfTheImage, bool isAppResource)
{
    if (!LockScreenManager.IsProvidedByCurrentApplication)
    {
        // If you're not the provider, this call will prompt the user for permission.
        // Calling RequestAccessAsync from a background agent is not allowed.
        await LockScreenManager.RequestAccessAsync();
    }

    // Only do further work if the access is granted.
    if (LockScreenManager.IsProvidedByCurrentApplication)
    {
        // At this stage, the app is the active lock screen background provider.
        // The following code example shows the new URI schema.
        // ms-appdata points to the root of the local app data folder.
        // ms-appx points to the Local app install folder, to reference resources bundled in the XAP package
        // var schema = isAppResource ? "ms-appx:///" : "ms-appdata:///Local/";
        var uri = new Uri(filePathOfTheImage, UriKind.Absolute);

        // Set the lock screen background image.
        LockScreen.SetImageUri(uri);

        // Get the URI of the lock screen background image.
        var currentImage = LockScreen.GetImageUri();
        System.Diagnostics.Debug.WriteLine("The new lock screen background image is set to {0}", currentImage.ToString());
        UpdatePrimaryTile();
        StartResourceIntensiveAgent();// StartPeriodicAgent();//
        // MessageBox.Show("Lock screen changed. Click F12 or go to lock screen.");
    }
    else
    {
        MessageBox.Show("Background can't be updated as you clicked no!!");
    }
}

public void RemoveResourceIntensiveAgent()
{
    try
    {
        if (resourceIntensiveTask != null)
        {
            ScheduledActionService.Remove(resourceIntensiveTaskName);
        }
    }
    catch (Exception)
    {
    }
}

/// <summary>
/// Code to start the resource intensive task
/// </summary>
private void StartResourceIntensiveAgent()
{
    // Variable for tracking enabled status of background agents for this app.
    agentsAreEnabled = true;

    resourceIntensiveTask = ScheduledActionService.Find(resourceIntensiveTaskName) as ResourceIntensiveTask;

    // If the task already exists and background agents are enabled for the
    // application, you must remove the task and then add it again to update 
    // the schedule.
    if (resourceIntensiveTask != null)
    {
        ScheduledActionService.Remove(resourceIntensiveTaskName);
    }

    resourceIntensiveTask = new ResourceIntensiveTask(resourceIntensiveTaskName);

    // The description is required for periodic agents. This is the string that the user
    // will see in the background services Settings page on the device.
    resourceIntensiveTask.Description = (resourceIntensiveTaskDescription);

    // Place the call to Add in a try block in case the user has disabled agents.
    try
    {
        ScheduledActionService.Add(resourceIntensiveTask);
        //ResourceIntensiveStackPanel.DataContext = resourceIntensiveTask;
        resourceIntensiveTask.ExpirationTime = DateTime.Now.AddDays(14);
        // If debugging is enabled, use LaunchForTest to launch the agent in one minute.
        ScheduledActionService.LaunchForTest(resourceIntensiveTaskName, TimeSpan.FromSeconds(30));

    }
    catch (InvalidOperationException exception)
    {
        if (exception.Message.Contains("BNS Error: The action is disabled"))
        {
            MessageBox.Show("Background agents for this application have been disabled by the user.");
            agentsAreEnabled = false;
        }
    }
    catch (SchedulerServiceException)
    {
        // No user action required.
    }
}

Answer 1

您的问题是您已将后台代理实施为ResourceIntensiveTask。 ResourceIntensiveTasks在以下非常具体的约束条件下运行：

已插入手机
锁定屏幕已启用
无线网络（非蜂窝）连接可用

考虑将此后台代理实现为PeriodicTask。如果您遇到运行时约束，请考虑尽可能多地重构代码，以便在主应用程序运行时预先处理锁定屏幕图像的哪些部分，或者在可以使用的包中创建静态图像资源传达相同的信息。

参考： Background agents for Windows Phone: Constraints for Resource-intensive Agents

LockScreen图像在Beta应用程序中不会更改

1 个答案: