跳轉獲取地址

package com.example.day02;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

public class Main2Activity extends AppCompatActivity {

    private ImageView img;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            Bitmap bit= (Bitmap) msg.obj;
            img.setImageBitmap(bit);
        }
    };
    private String picdata;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        img = findViewById(R.id.img);
        Intent intent=getIntent();
        picdata = intent.getStringExtra("picdata");
        new Thread(){
            @Override
            public void run() {
                NexData();
            }
        }.start();
    }

    private void NexData() {

        try {
            URL url = new URL(picdata);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setReadTimeout(5000);
            urlConnection.setConnectTimeout(5000);
            int responseCode = urlConnection.getResponseCode();
            if(responseCode==200){
                InputStream inputStream = urlConnection.getInputStream();
                Bitmap bitmap= BitmapFactory.decodeStream(inputStream);
                Message msg =Message.obtain();
                msg.obj=bitmap;
                handler.sendMessage(msg);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}