Android 通过短链接，获取长连接

package com.example.httptest;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.TextView;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.json.JSONException;import org.json.JSONObject;import java.io.IOException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;public class MyActivity extends Activity {    TextView textView;    Button button;String location;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        final Handler handler = new Handler(){            @Override            public void handleMessage(Message msg) {                super.handleMessage(msg);                switch (msg.what){                    case 1:                        textView.setText(location);                }            }        };        setContentView(R.layout.main);        textView = (TextView) findViewById(R.id.text);        button = (Button) findViewById(R.id.fetch_button);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                new Thread(new Runnable() {                    @Override                    public void run() {                        String urlString = "https://db.tt/vYI4UVeb";                        URL url = null;                        try {                            url = new URL(urlString);                            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();                            urlConnection.setInstanceFollowRedirects(false);                            location = urlConnection.getHeaderField("location");                            handler.sendEmptyMessage(1);                        } catch (MalformedURLException e) {                            e.printStackTrace();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                }).start();            }        });    }}