或者在一个实际的设备上，你可以去设置->移动网络->首选的网络类型，并选择可用的最慢的… 当然，这是非常有限的，但对于某些测试目的，这可能足够了。

Facebook建立了一个叫做增强交通控制的东西。GitHub页面上的简要总结:

Augmented Traffic Control (ATC) is a tool to simulate network conditions. It allows controlling the connection that a device has to the internet. Developers can use ATC to test their application across varying network conditions, easily emulating high speed, mobile, and even severely impaired networks. Aspects of the connection that can be controlled include: bandwidth latency packet loss corrupted packets packets ordering In order to be able to shape the network traffic, ATC must be running on a device that routes the traffic and sees the real IP address of the device, like your network gateway for instance. This also allows any devices that route through ATC to be able to shape their traffic. Traffic can be shaped/unshaped using a web interface allowing any devices with a web browser to use ATC without the need for a client application.

你可以在GitHub上找到它:https://github.com/facebook/augmented-traffic-control

他们还为此写了一篇博客:https://code.facebook.com/posts/1561127100804165/augmented-traffic-control-a-tool-to-simulate-network-conditions/

在模拟器中测试低/坏连接的应用程序的简单方法:

运行>运行配置，选择Android应用程序，然后进入目标选项卡。 查看模拟器启动参数。在这里，您可以轻松地修改网络速度和网络延迟。

在Android Studio中，运行模拟器时:

1-点击模拟器侧栏底部的设置按钮

2-进入蜂窝网络

3—选择“网络类型”

由于iPhone开发者选项适用于wifi绑定，你可以获得一部iOS 6及以上版本的iPhone(并已被设置为使用xcode开发)，将其设置为模拟所需的网络配置文件，将你的Android设备连接到它的热点

你可以使用模拟器。看看这个页面:Android模拟器。请注意下面两个论点:

-netdelay <delay> Set network latency emulation to . Default value is none. See the table in Network Delay Emulation for supported values. -netspeed <speed> Set network speed emulation to . Default value is full. See the table in Network Speed Emulation for supported values. Speeds for reference in increasing kbps: UP DOWN -------- ---------- gsm GSM/CSD 14.4 14.4 hscsd HSCSD 14.4 57.6 gprs GPRS 28.8 57.6 umts UMTS/3G 384.0 384.0 edge EDGE/EGPRS 473.6 473.6 hsdpa HSDPA 5760.0 13,980.0 lte LTE 58,000.0 173,000.0 evdo EVDO 75,000.0 280,000.0 full No limit ∞ ∞