ImageView获取网络图片

注意加网络权限

package com.example.test_edittext;

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.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;

public class MainActivity extends Activity {
	Activity context=this;
	Bitmap bitmap;
	//定义一个图片显示控件
	private ImageView imageView;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new Task().execute();
    }
    /**
     * 获取网落图片资源 
     * @param url
     * @return
     */
    public static Bitmap getHttpBitmap(String url){
    	URL myFileURL;
    	Bitmap bitmap=null;
    	try{
    		myFileURL = new URL(url);
    		//获得连接
    		HttpURLConnection conn=(HttpURLConnection)myFileURL.openConnection();
    		//设置超时时间为6000毫秒，conn.setConnectionTiem(0);表示没有时间限制
    		conn.setConnectTimeout(6000);
    		//连接设置获得数据流
    		conn.setDoInput(true);
    		//不使用缓存
    		conn.setUseCaches(false);
    		//这句可有可无，没有影响
    		conn.connect();
    		//得到数据流
    		InputStream is = conn.getInputStream();
    		//解析得到图片
    		bitmap = BitmapFactory.decodeStream(is);
    		//关闭数据流
    		is.close();
    	}catch(Exception e){
    		e.printStackTrace();
    	}
    	
		return bitmap;
    	
    }
    class Task  extends AsyncTask<String, Integer, String>{

		@Override
		protected String doInBackground(String... params) {
			// TODO Auto-generated method stub
			 String url = "http://avatar.csdn.net/4/9/2/1_djun100.jpg";
		        //得到可用的图片
		         bitmap = getHttpBitmap(url);
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);
	         Message msg=new Message();
	         msg.what=0;
	         handler.sendMessage(msg);

		}
    	
    }
    Handler handler=new Handler(){

		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			super.handleMessage(msg);
			switch(msg.what){
			case 0:
		        imageView = (ImageView)context.findViewById(R.id.iv_pic);
		        //显示
		        imageView.setImageBitmap(bitmap);
			}
		}
    	
    };
}