java http显示图片_利用HttpURLConnection实现从网上获取图片资源并显示在屏幕上

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{

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();

}

}