Android 通过短链接，获取长连接

最新推荐文章于 2024-04-30 15:19:35 发布

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本文介绍了一个简单的Android应用案例，该应用通过按钮触发HTTP请求，并在TextView中显示获取到的Location头字段信息。文章展示了如何使用Java和Apache HttpClient库来实现这一功能。

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();

            }
        });
    }

}