下载显示网路图片的例子

一个很简单的例子,直接上代码:
1. ShowUrlImage.java文件


package cn.com;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class ShowUrlImage extends Activity
{
  private Button Image_btn;
  private ImageView imageShow;

  String uriPic = "http://lh3.ggpht.com/_s354WAuIc9E/"
      + "R_DpW4Rzj-I/AAAAAAAAAsc/Ox73tdxGLSw/logo.jpg";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Image_btn = (Button) findViewById(R.id.Image);
    imageShow = (ImageView) findViewById(R.id.imageShow);

    Image_btn.setOnClickListener(new Button.OnClickListener()
    {
      @Override
      public void onClick(View arg0)
      {
        /* 设置Bitmap在ImageView中 */
        imageShow.setImageBitmap(getURLBitmap());
      }
    });
  }

  public Bitmap getURLBitmap()
  {
    URL imageUrl = null;
    Bitmap bitmap = null;
    try
    {
      /* new URL对象将网址传入 */
      imageUrl = new URL(uriPic);
    } catch (MalformedURLException e)
    {
      e.printStackTrace();
    }
    try
    {
      /* 取得连接 */
      HttpURLConnection conn = (HttpURLConnection) imageUrl
          .openConnection();
      conn.connect();
      /* 取得返回的InputStream */
      InputStream is = conn.getInputStream();
      // is.read(b)
      /* 将InputStream变成Bitmap */
      bitmap = BitmapFactory.decodeStream(is);
      /* 关闭InputStream */
      is.close();
    } catch (IOException e)
    {
      e.printStackTrace();
    }
    return bitmap;
  }

}

2.main.xml文件


<?xml version="1.0" encoding="utf-8"?>
android:layout_width="fill_parent" android:layout_height="fill_parent">


android:layout_below="@+id/myButton1" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_gravity="center" />

外加注意权限设定:

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