ImageView显示网络图片

Posted 2020-08-09 newcaoguo

package com.example.urlimage;  
  
import java.io.InputStream;  
import java.net.HttpURLConnection;  
import java.net.URL;  
  
import android.app.Activity;  
import android.graphics.Bitmap;  
import android.graphics.BitmapFactory;  
import android.os.Bundle;  
import android.os.Handler;  
import android.os.Message;  
import android.view.View;  
import android.widget.Button;  
import android.widget.ImageView;  
  
public class MainActivity extends Activity {  
  
    //声明地址  
    private Button btn;  
    private ImageView img;  
    private String url = "http://imgstore04.cdn.sogou.com/app/a/100520024/877e990117d6a7ebc68f46c5e76fc47a";  
  
    //在消息队列中实现对控件的更改  
    private Handler handle = new Handler() {  
        public void handleMessage(Message msg) {  
            switch (msg.what) {  
            case 0:  
                System.out.println("111");  
                Bitmap bmp=(Bitmap)msg.obj;  
                img.setImageBitmap(bmp);  
                break;  
            }  
        };  
    };  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
  
        btn = (Button) findViewById(R.id.btn);  
        img = (ImageView) findViewById(R.id.img);  
  
        btn.setOnClickListener(new View.OnClickListener() {  
  
            @Override  
            public void onClick(View v) {  
                //新建线程加载图片信息，发送到消息队列中  
                new Thread(new Runnable() {  
  
                    @Override  
                    public void run() {  
                        // TODO Auto-generated method stub  
                        Bitmap bmp = getURLimage(url);  
                        Message msg = new Message();  
                        msg.what = 0;  
                        msg.obj = bmp;  
                        System.out.println("000");  
                        handle.sendMessage(msg);  
                    }  
                }).start();  
            }  
        });  
    }  
  
    //加载图片  
    public Bitmap getURLimage(String url) {  
        Bitmap bmp = null;  
        try {  
            URL myurl = new URL(url);  
            // 获得连接  
            HttpURLConnection conn = (HttpURLConnection) myurl.openConnection();  
            conn.setConnectTimeout(6000);//设置超时  
            conn.setDoInput(true);  
            conn.setUseCaches(false);//不缓存  
            conn.connect();  
            InputStream is = conn.getInputStream();//获得图片的数据流  
            bmp = BitmapFactory.decodeStream(is);  
            is.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return bmp;  
    }  
}