即时访问网络图片文件展示---HttpURLConnection

创建Main类：

package com.action;

import java.io.IOException;
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.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class Main extends Activity
{
  private Button bt;
  private TextView tv;
  private ImageView image;
  String uriPic = "http://image.techweb.com.cn/upload/2011/0201/img20110212964974010.jpg";

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

    bt = (Button) findViewById(R.id.myButton1);
    tv = (TextView) findViewById(R.id.myTextView1);
    image = (ImageView) findViewById(R.id.myImageView1);

    bt.setOnClickListener(new Button.OnClickListener()
    {
      @Override
      public void onClick(View arg0)
      {
    	//设置Bitmap在IMageView中
        image.setImageBitmap(getURLBitmap());
        tv.setText("");
      }
    });
  }

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

}

 layout配置文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
  xmlns:android="http://schemas.android.com/apk/res/android" 
  android:background="@drawable/white" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  > 
  <TextView 
    android:id="@+id/myTextView1" 
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="@string/app_name"/> 
  <Button 
    android:id="@+id/myButton1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/str_button1" /> 
  <ImageView 
    android:id="@+id/myImageView1"  
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"  
    android:layout_gravity="center" />  
</LinearLayout>

 

values 中的color:

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
  <drawable name="darkgray">#808080FF</drawable> 
  <drawable name="white">#FFFFFFFF</drawable> 
</resources>

 

values 中的string:

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
  <string name="hello">Hello World</string> 
  <string name="app_name">即时访问网络图片</string> 
  <string name="str_button1">显示网络上的图片</string> 
</resources>

 

最后不要忘记配置访问网络权限