FaceBook 开源的一个测试网络访问速度的库
README.md
Network Connection Class
Network Connection Class is an Android library that allows you to figure out the quality of the current user's internet connection. The connection gets classified into several "Connection Classes" that make it easy to develop against. The library does this by listening to the existing internet traffic done by your app and notifying you when the user's connection quality changes. Developers can then use this Connection Class information and adjust the application's behaviour (request lower quality images or video, throttle type-ahead, etc).
Network Connection Class currently only measures the user's downstream bandwidth. Latency is also an important factor, but in our tests, we've found that bandwidth is a good proxy for both.
The Network Connection Class library takes care of spikes using a moving average of the incoming samples, and also applies some hysteresis (both with a minimum number of samples and amount the average has to cross a boundary before triggering a bucket change): 
Integration
Download
Downloadthe latest JARs or grab via Gradle:
compile 'com.facebook.network.connectionclass:connectionclass:1.0.1' or Maven:
<dependency> <groupId>com.facebook.network.connectionclass</groupId> <artifactId>connectionclass</artifactId> <version>1.0.1</version> </dependency>
Calculate Connection Class
Connection Class provides an interface for classes to add themselves as listeners for when the network's connection quality changes. In the subscriber class, implement ConnectionClassStateChangeListener :
public interface ConnectionClassStateChangeListener { public void onBandwidthStateChange(ConnectionQuality bandwidthState); }
and subscribe with the listener:
ConnectionClassManager.getInstance().register(mListener);
Alternatively, you can manually query for the current connection quality bucket with getCurrentBandwidthQuality() .
ConnectionQuality cq = ConnectionClassManager.getInstance().getCurrentBandwidthQuality();
The main way to provide the ConnectionClassManager data is to use the DeviceBandwidthSampler. The DeviceBandwidthSampler samples the device's underlying network stats when you tell it you're performing some sort of network activity (downloading photos, playing a video, etc).
// Override ConnectionClassStateChangeListener ConnectionClassManager.getInstance().register(mListener); DeviceBandwidthSampler.getInstance().startSampling(); // Do some downloading tasks DeviceBandwidthSampler.getInstance().stopSampling();
If the application is aware of the bandwidth downloaded in a certain time frame, data can be added to the moving average using:
ConnectionClassManager.addBandwidth(bandwidth, time);
See the connectionclass-sample project for more details.
Improve Connection Class!
See theCONTRIBUTING.md file for how to help out.
License
Connection Class is BSD-licensed. We also provide an additional patent grant.
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