利用HttpURLConnection实现从网上获取图片资源并显示在屏幕上

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<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">

    <button android:id="@+id/btn_01" android:layout_width="match_parent" android:layout_height="wrap_content" android:="start" android:text="获取网上图片">

    <imageview android:id="@+id/iv_01" android:layout_height="wrap_content" android:layout_width="match_parent">

</imageview></button></linearlayout>

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package com.example.day06_ex_02;

import java.io.FileInputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.os.AsyncTask;

import android.os.Bundle;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.view.Menu;

import android.view.View;

import android.widget.ImageView;

import android.widget.TextView;

public class MainActivity   extends Activity   {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

     public class MyTask extends AsyncTask<string,string,bitmap deep="9">{

         Bitmap   bit;

         @Override

        protected Bitmap doInBackground(String... params) {

            try {

                //网上获取图片的地址

                URL   url=new URL("http://news.hhtc.edu.cn/uploads/20131101160529587.jpg");

                HttpURLConnection   conn=(HttpURLConnection) url.openConnection();

              bit=BitmapFactory.decodeStream(conn.getInputStream());

            }   catch (Exception   e) {

                e.printStackTrace();

            }

            return bit;

        }

         @Override

        protected void onPostExecute(Bitmap result) {

            //   TODO Auto-generated method stub

            super.onPostExecute(result);

            ImageView   tv=(ImageView) findViewById(R.id.iv_01);

            tv.setImageBitmap(result);

        }

     }

     public void start(View v){

         new MyTask().execute();

     }

}</string,string,bitmap>

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<uses-permission android:name="android.permission.INTERNET"></uses-permission>