Question

我尝试从Twitter访问信息，我按照以下链接：

http://code.google.com/p/sociallib/wiki/SocialLibGuide

我不理解以下两行，它在以下行中显示错误。

        twitter.requestAuthorization(this);
        twitter.authorize(this);

下面添加了完整的代码。

它表示需要anroid.content.Context和android.app.Activity。我真的不知道如何添加它们。任何帮助表示赞赏。

package sociallibjar;

import android.R;
import android.content.Context;
import com.expertiseandroid.lib.sociallib.connectors.SocialNetworkHelper;
import com.expertiseandroid.lib.sociallib.connectors.TwitterConnector;
import com.expertiseandroid.lib.sociallib.model.twitter.TwitterUser;
import org.scribe.oauth.Token;

public class TwitterApp {

    String CONS_KEY = "";
    String CONS_SEC = "";
    String CALLBACK = "";

    public void twiter() {
        try {
            TwitterConnector twitter = SocialNetworkHelper.createTwitterConnector(CONS_KEY, CONS_SEC, CALLBACK);
            twitter.requestAuthorization(this);
            twitter.authorize(this);
            Token at = twitter.getAccessToken();
            String token = at.getToken(); //You can store these two strings
            String secret = at.getSecret();//in order to build the token back


            Token myAccessToken = new Token(token, secret);
            twitter.authentify(myAccessToken);
            TwitterUser me = twitter.getUser(); //Retrieves the current user
            String nickname = me.getUsername(); //Some information is available through method calls
            int nbFollowers = me.nbFollowers; //Some is available through object fields

            System.out.println("You are logged in as " + nickname + " and you have " + nbFollowers + " followers"); //Now we can print the information we retrieved onscreen

            twitter.tweet("Tweeting from code"); //A simple tweet

            twitter.tweet("I have " + twitter.getUser().nbFollowers + " followers!");//A more elaborate tweet
            //twitter.logout(this); //Providing this code is located in an Activity (or Context) class


        } catch (Exception e) {
        }

    }


}

Answer 1

该链接的文档非常清楚。对于这些行：

twitter.requestAuthorization(this); //Providing this code is located in an Activity (or Context) class
twitter.authorize(this);

this代表Context（例如Activity）。现在，由于您的课程TwitterApp未展开Activity，因此您需要引用Context来提供这些方法。为此，您可以为TwitterApp类添加一个构造函数，该构造函数带有Context：

private Context ctx; //-<field in the TwitterApp class

public TwitterApp (Context ctx) {
   this.ctx = ctx;
}

然后将这个上下文用于这些方法：

twitter.requestAuthorization(ctx);
twitter.authorize(ctx);

在您实例化TwitterApp课程的活动中，只需传递this：

TwitterApp obj = new TwitterApp(this);

如何在android.content.Context和android.app.Activity中创建上下文？

1 个答案: