android之通过URL来获取网络资源并下载资源简单实例

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package com.android.xiong.urltest;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.widget.ImageView;

public class MainActivity extends Activity {
	ImageView show;
	Bitmap bitmap;
	Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			if (msg.what == 0x123) {
				// 使用ImageView显示该图片
				show.setImageBitmap(bitmap);

			}
		}

	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		show = (ImageView) findViewById(R.id.show);

		new Thread() {

			@Override
			public void run() {
				// 定义一个URL对象
				URL url;
				try {
					url = new URL(
							"http://img1.gtimg.com/news/pics/hv1/37/195/1468/95506462.jpg");
					// 打开该URL的资源输入流
					InputStream is = url.openStream();
					// 从InputStream中解析出图片
					bitmap = BitmapFactory.decodeStream(is);
					// 发送消息
					handler.sendEmptyMessage(0x123);
					is.close();
					// 再次打开RL对应的资源输入流
					is = url.openStream();
					// 打开手机文件对应的输出流
					OutputStream os = openFileOutput("KEQIANG.JPG", MODE_APPEND);
					byte[] buff = new byte[1024];
					int hasRead = 0;
					// 将URL资源下载到本地
					while ((hasRead = is.read(buff)) > 0) {
						os.write(buff, 0, hasRead);
					}
					is.close();
					os.close();
				} catch (MalformedURLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}

		}.start();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

<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"
    tools:context=".MainActivity" >

    <ImageView 
        android:id="@+id/show"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:contentDescription="@string/hello_world"/>

</LinearLayout>

 

</pre><pre code_snippet_id="86820" snippet_file_name="blog_20131128_4_1113442" name="code" class="html"> <uses-permission 
        android:name="android.permission.INTERNET"/>