我想获取Twitter的追随者，以下列表中的android但是，让空指针

问题描述

我想获得Twitter的追随者用户列表为什么我用下面的code，但让空指针在的（用户用户：追随者），看到这个链接<一个href="http://grep$c$c.com/file/repo1.maven.org/maven2/org.twitter4j/twitter4j-examples/2.2.4/twitter4j/examples/list/GetAllUserLists.java" rel="nofollow">http://grep$c$c.com/file/repo1.maven.org/maven2/org.twitter4j/twitter4j-examples/2.2.4/twitter4j/examples/list/GetAllUserLists.java在这里，他们引导到如何让用户在Java中，但 ResponseList＆LT;在UserList＆GT;名单= twitter.getAllUserLists（参数[0]）; 在这个环节是什么ARG [0]为每个方法的请指导我解决我的问题。

 私有静态最后弦乐用户=您的用户;
 私有静态最后弦乐PW =你的密码;


    //做一个Twitter的对象
           叽叽喳喳叽叽喳喳=新TwitterFactory（）的getInstance（用户，PW）。

    //设置我的状态
    twitter.setStatus（@ vogella与Twitter在Java中搞乱）;

    清单＆lt;使用者＆GT;追随者= twitter.getFollowers（）;
    对于（用户用户：追随者）{
        的System.out.println（user.getName（））;
    }
}
 

解决方案

按我的知识，Twiiter已经更新了他们的API，现在他们支持的OAuth 2.0的机制来获取任何信息。

要检索的追随者LIS，你应该使用下面的链接 https://dev.twitter.com/docs/api/1/get /追随者/ IDS 您可以使用Twitter4j库的Java / Android的 http://twitter4j.org/en/index.html

 私人无效twitter_req（）
{

        字符串access_token = prefs.getString（twitter_token，NULL）;
        字符串access_secret = prefs.getString（twitter_secret，NULL）;

              twitter_api拉皮=新twitter_api（access_token，access_secret，新GetUserInfo_TWRequestCallback（））;
                lapi.get（api.twitter.com/1/followers/ids.json）;

}
公共无效的get（）{
        尝试 {
                HTTPGET HTT prequest =新HTTPGET（mUrl）;
                符号（HTT prequest）;
                sendSync（HTT prequest）;
        }赶上（例外五）{
                Log.d（获得（），e.toString（））;
                doFailCallback（）;
        }
}
私人无效sendSync（Htt的prequestBase HTT prequest）
{

            HttpClient的HttpClient的=新DefaultHttpClient（）;
            HTT presponse HTT presponse = httpClient.execute（HTT prequest）;
            状态行状态行= HTT presponse.getStatusLine（）;
            HttpEntity实体= HTT presponse.getEntity（）;
            //

            //
            响应=空;
            如果（实体！= NULL）{
                响应= getResponseFromStream（entity.getContent（））; //
            }
}
公共无效标志（Htt的prequestBase HTT prequest）抛出OAuthMessageSignerException，OAuthExpectationFailedException {
       // MSOAuth的OAuth = MSOAuth.init（mSession）;
       // oauth.sign（HTT prequest）;
         尝试 {
        consumer.sign（HTT prequest）;
        }赶上（OAuthCommunicationException E）{
            响应=errorsign;
            如果（E！= NULL）
                如果（e.getMessage（）！= NULL）
                {
                    响应= e.getMessage（）;
                }
            // TODO自动生成的catch块
            e.printStackTrace（）;
        }
}
 

i want to obtain twitter follower user list that why i am using following code but giving NullPointer on for (User user : followers) and see this link http://grepcode.com/file/repo1.maven.org/maven2/org.twitter4j/twitter4j-examples/2.2.4/twitter4j/examples/list/GetAllUserLists.java here they guided to how to get Users in Java but ResponseList<UserList> lists = twitter.getAllUserLists(args[0]); in this link what is arg[0] as per method http://twitter4j.org/ja/javadoc/twitter4j/api/ListMethods.html please guide me to solve my problem.

 private static final String user ="your-user";
 private static final String pw ="your-password";


    // Make a Twitter object
           Twitter twitter = new TwitterFactory().getInstance(user,pw);

    // Set my status
    twitter.setStatus("@vogella messing with Twitter in Java");

    List<User> followers = twitter.getFollowers();
    for (User user : followers) {
        System.out.println(user.getName());
    }
}

解决方案

As per my knowledge, Twiiter has updated their apis, now they are supporting oauth 2.0 mechanism to retrieve any info.

To retrieve followers lis you should use below linkhttps://dev.twitter.com/docs/api/1/get/followers/idsyou can use Twitter4j library for java/androidhttp://twitter4j.org/en/index.html

private void twitter_req()
{

        String access_token = prefs.getString("twitter_token", null);
        String access_secret = prefs.getString("twitter_secret", null);

              twitter_api lapi=new twitter_api(access_token,access_secret,new GetUserInfo_TWRequestCallback());
                lapi.get("api.twitter.com/1/followers/ids.json ");

}
public void get() {
        try {
                HttpGet httpRequest = new HttpGet(mUrl);
                sign(httpRequest);
                sendSync(httpRequest);
        } catch(Exception e) {
                Log.d(" get()", e.toString());
                doFailCallback();
        }
}
private void sendSync(HttpRequestBase httpRequest)
{

            HttpClient httpClient = new DefaultHttpClient();
            HttpResponse httpResponse = httpClient.execute(httpRequest);
            StatusLine statusLine = httpResponse.getStatusLine();
            HttpEntity entity = httpResponse.getEntity();
            //

            //
            response = "null";
            if (entity != null) {
                response = getResponseFromStream(entity.getContent());  //
            }
}
public void sign(HttpRequestBase httpRequest) throws OAuthMessageSignerException, OAuthExpectationFailedException {
       // MSOAuth oauth = MSOAuth.init(mSession);
       // oauth.sign(httpRequest);
         try {
        consumer.sign(httpRequest);
        } catch (OAuthCommunicationException e) {
            response="errorsign";
            if(e!=null)
                if(e.getMessage()!=null)
                {
                    response=e.getMessage();
                }
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
}

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