获取当前活动 - Xamarin Android [英] Get current Activity - Xamarin Android

问题描述

我正在开发适用于 Android 和 iOS 的便携式应用程序.我当前的功能是截取屏幕截图并在代码中使用该图像.因此，我在便携式库中有一个接口.

I am developing an portable App for Android and iOS. My current function is taking a Screenshot and use that image in the code. Therefor I have an Interface in the portable library.

public interface IFileSystemService
{
    string GetAppDataFolder();
}

我也在便携式库中使用以下代码截取屏幕截图:

I am taking the Screenshot also in the portable Library with the following code:

static public bool TakeScreenshot()
    {
        try
        {
            byte[] ScreenshotBytes = DependencyService.Get<Interface.IScreenshotManager>().TakeScreenshot();
            return true;
        }
        catch (Exception ex)
        {
        }
        return false;
    }

这要么调用Android 要么调用iOS 版本.

This either calls the Android or the iOS version.

安卓:

class ScreenshotManagerAndroid : IScreenshotManager
{
    public static Activity Activity { get; set; }

    public byte[] TakeScreenshot()
    {

        if (Activity == null)
        {
            throw new Exception("You have to set ScreenshotManager.Activity in your Android project");
        }

        var view = Activity.Window.DecorView;
        view.DrawingCacheEnabled = true;

        Bitmap bitmap = view.GetDrawingCache(true);

        byte[] bitmapData;

        using (var stream = new MemoryStream())
        {
            bitmap.Compress(Bitmap.CompressFormat.Png, 0, stream);
            bitmapData = stream.ToArray();
        }

        return bitmapData;
    }

现在的问题是从我的应用中获取当前的 Activity.

The question now is to get the current Activity from my app.

推荐答案

自 Xamarin 2.5 发布以来，Xamarin.Forms.Forms.Context 是 过时.现在可以通过以下方式获取上下文:

Since the release of Xamarin 2.5, Xamarin.Forms.Forms.Context is obsolete. The Context can now be obtained as follows:

var currentContext = Android.App.Application.Context;

这篇关于获取当前活动 - Xamarin Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！