package com.lucky.test51url;

import android.annotation.SuppressLint;

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.Button;

import android.widget.ImageView;

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

public class MainActivity extends AppCompatActivity {

    Button button1;

    ImageView imageView1;

    Bitmap bitmap1;

    String pathString="https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1552803802&di=e730996ff6ab40c6102de6cab6d6ab52&src=http://img4.duitang.com/uploads/item/201406/28/20140628082503_HcGBS.jpeg";

    @SuppressLint("HandlerLeak")

    Handler handler=new Handler(){  //利用hander接收线程中发送的数据，并在UI界面中显示出来

        @Override

        public void handleMessage(Message msg) {

            if(msg.what==0x01){

                imageView1.setImageBitmap(bitmap1);

            }

        }

    };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button1=findViewById(R.id.button);

        imageView1=findViewById(R.id.imageView);

        button1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                //开辟一个新的线程

                new Thread(){

                    @Override

                    public void run() {

                        try {

                            //利用URL访问网络

                            URL url=new URL(pathString);

                            URLConnection connection=url.openConnection();//获得网络连接

                            InputStream inputStream=connection.getInputStream();//利用connection的输入流访问网络

                            bitmap1=BitmapFactory.decodeStream(inputStream);

                            handler.sendEmptyMessage(0x01);

                        } catch (MalformedURLException e) {

                            e.printStackTrace();

                        } catch (IOException e) {

                            e.printStackTrace();

                        }

                    }

                }.start();

            }

        });

    }

}