(The OAuth authentication instance set of Sina, Netease, Tencent and Sohu Weibo for Android. If you want to understand more about OAuth authentication, please download the post Java source code package. In the example, the process of OAuth authentication is fully analyzed: define the URL encoding method, request the url, obtain the key and secret provided by the service provider after registration, generate 32 character random strings with different length each time, set the Oauth protocol version, request signature and other operations.)