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   源码介绍

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前几天项目需要做类似android市场应用同时下载，实现了功能，并抽取关键代码，写成了小demo，希望对用户有所帮助

package com.cn.do1.downloadtest.service;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.cn.do1.downloadtest.DownloadTest;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.widget.Toast;

public class DownloadService extends Service{

	private static NotificationManager nm;
	private static  Notification notification;
	private static boolean cancelUpdate = false;
	private static MyHandler myHandler;
	private static ExecutorService executorService = Executors.newFixedThreadPool(5); // 固定五个线程来执行任务
	public static Map<Integer,Integer> download = new HashMap<Integer, Integer>();
	public static Context context;
	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	@Override
	public void onStart(Intent intent, int startId) {
		super.onStart(intent, startId);
	}

	@Override
	public void onCreate() {
		super.onCreate();
		nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
		myHandler = new MyHandler(Looper.myLooper(), DownloadService.this);
		context = this;
	}

	@Override
	public void onDestroy() {
		super.onDestroy();
	}

	public static void downNewFile(final String url,final int notificationId,final String name){
		if(download.containsKey(notificationId))
			return;
		notification = new Notification();
		notification.icon = android.R.drawable.stat_sys_download;
		// notification.icon=android.R.drawable.stat_sys_download_done;
		notification.tickerText = name   "开始下载";
		notification.when = System.currentTimeMillis();
		notification.defaults = Notification.DEFAULT_LIGHTS;
		//显示在“正在进行中”
		notification.flags = Notification.FLAG_NO_CLEAR | Notification.FLAG_ONGOING_EVENT;
		PendingIntent contentIntent = PendingIntent.getActivity(context, notificationId,new Intent(context, DownloadTest.class), 0);
		notification.setLatestEventInfo(context, name, "0%", contentIntent);
		download.put(notificationId, 0);
		// 将下载任务添加到任务栏中
		nm.notify(notificationId, notification);
		// 启动线程开始执行下载任务
		downFile(url,notificationId,name);
	}
	
	// 下载更新文件
	private static  void downFile(final String url,final int notificationId,final String name) {
		executorService.execute(new Runnable() {
			@Override
			public void run() {
				// TODO Auto-generated method stub
				File tempFile = null;
				try {
					HttpClient client = new DefaultHttpClient();
					// params[0]代表连接的url
					HttpGet get = new HttpGet(url);
					HttpResponse response = client.execute(get);
					HttpEntity entity = response.getEntity();
					long length = entity.getContentLength();
					InputStream is = entity.getContent();
					if (is != null) {
						File rootFile = new File(Environment.getExternalStorageDirectory(),"/zhtrade");
						if (!rootFile.exists() && !rootFile.isDirectory())
							rootFile.mkdir();

						tempFile = new File(Environment.getExternalStorageDirectory(),"/zhtrade/"  url.substring(url.lastIndexOf("/"),url.indexOf("?")) "_" notificationId ".apk");
						if (tempFile.exists())
							tempFile.delete();
						tempFile.createNewFile();

						// 已读出流作为参数创建一个带有缓冲的输出流
						BufferedInputStream bis = new BufferedInputStream(is);

						// 创建一个新的写入流，讲读取到的图像数据写入到文件中
						FileOutputStream fos = new FileOutputStream(tempFile);
						// 已写入流作为参数创建一个带有缓冲的写入流
						BufferedOutputStream bos = new BufferedOutputStream(fos);

						int read;
						long count = 0;
						int precent = 0;
						byte[] buffer = new byte[1024];
						while ((read = bis.read(buffer)) != -1 && !cancelUpdate) {
							bos.write(buffer, 0, read);
							count  = read;
							precent = (int) (((double) count / length) * 100);

							// 每下载完成1%就通知任务栏进行修改下载进度
							if (precent - download.get(notificationId) >= 1) {
								download.put(notificationId, precent);
								Message message = myHandler.obtainMessage(3,precent);
								Bundle bundle = new Bundle();
								bundle.putString("name", name);
								message.setData(bundle);
								message.arg1 = notificationId;
								myHandler.sendMessage(message);
							}
						}
						bos.flush();
						bos.close();
						fos.flush();
						fos.close();
						is.close();
						bis.close();
					}

					if (!cancelUpdate) {
						Message message = myHandler.obtainMessage(2, tempFile);
						message.arg1 = notificationId;
						Bundle bundle = new Bundle();
						bundle.putString("name", name);
						message.setData(bundle);
						myHandler.sendMessage(message);
					} else {
						tempFile.delete();
					}
				} catch (ClientProtocolException e) {
					if (tempFile.exists())
						tempFile.delete();
					Message message = myHandler.obtainMessage(4, name "下载失败：网络异常！");
					message.arg1 = notificationId;
					myHandler.sendMessage(message);
				} catch (IOException e) {
					if (tempFile.exists())
						tempFile.delete();
					Message message = myHandler.obtainMessage(4, name "下载失败：文件传输异常");
					message.arg1 = notificationId;
					myHandler.sendMessage(message);
				} catch (Exception e) {
					if (tempFile.exists())
						tempFile.delete();
					Message message = myHandler.obtainMessage(4, name "下载失败," e.getMessage());
					message.arg1 = notificationId;
					myHandler.sendMessage(message);
				}
			}
		});
	}

	// 安装下载后的apk文件
	private void Instanll(File file, Context context) {
		Intent intent = new Intent(Intent.ACTION_VIEW);
		intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		intent.setAction(android.content.Intent.ACTION_VIEW);
		intent.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");
		context.startActivity(intent);
	}

	/* 事件处理类 */
	class MyHandler extends Handler {
		private Context context;

		public MyHandler(Looper looper, Context c) {
			super(looper);
			this.context = c;
		}

		@Override
		public void handleMessage(Message msg) {
			PendingIntent contentIntent = null;
			super.handleMessage(msg);
			if (msg != null) {
				switch (msg.what) {
				case 0:
					Toast.makeText(context, msg.obj.toString(),Toast.LENGTH_SHORT).show();
					download.remove(msg.arg1);
					break;
				case 1:
					break;
				case 2:
					contentIntent = PendingIntent.getActivity(DownloadService.this, msg.arg1,new Intent(DownloadService.this, DownloadTest.class), 0);
					notification.setLatestEventInfo(DownloadService.this, msg.getData().getString("name") "下载完成",   "100%",contentIntent);
                    nm.notify(msg.arg1, notification);
					// 下载完成后清除所有下载信息，执行安装提示
                    download.remove(msg.arg1);
					nm.cancel(msg.arg1);
					Instanll((File) msg.obj, context);
					break;
				case 3:
					 contentIntent = PendingIntent.getActivity(DownloadService.this, msg.arg1,new Intent(DownloadService.this, DownloadTest.class), 0);
					notification.setLatestEventInfo(DownloadService.this, msg.getData().getString("name") "正在下载",  download.get(msg.arg1)   "%",contentIntent);
                    nm.notify(msg.arg1, notification);
					break;
				case 4:
					Toast.makeText(context, msg.obj.toString(),Toast.LENGTH_SHORT).show();
					download.remove(msg.arg1);
					nm.cancel(msg.arg1);
					break;
				}
			}
		}
	}
	

}

package com.cn.do1.downloadtest;

import java.io.ByteArrayInputStream;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Iterator;
import java.util.List;

import com.cn.do1.downloadtest.service.DownloadService;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;

public class DownloadTest extends Activity implements OnClickListener {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.down_file);
		Intent intent = new Intent(this, DownloadService.class);
		startService(intent);
		bindListener();
		getSingInfo();
	}

	void bindListener() {
		findViewById(R.id.btn_load_btn_one).setOnClickListener(this);
		findViewById(R.id.btn_load_btn_two).setOnClickListener(this);
		findViewById(R.id.btn_load_btn_three).setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_load_btn_one:
			DownloadService
					.downNewFile(
							"http://m.appchina.com/market/e/882602/0/16/44DFFDF6E89D0CC2F5CB41CE041E9BB7/packagename.apk?refererPage=m.cherry.soft_list",
							351, "百度知道");
			break;
		case R.id.btn_load_btn_two:
			DownloadService
					.downNewFile(
							"http://m.appchina.com/market/e/886657/feature/1/360F5D5A76A3E0E397451CE9EA503DE6/com.sogou.novel?refererPage=m.cherry.soft_main",
							1071, "搜狗小说");
			break;
		case R.id.btn_load_btn_three:
			DownloadService
					.downNewFile(
							"http://m.appchina.com/market/e/885495/feature/2/360F5D5A76A3E0E397451CE9EA503DE6/com.king2.yyh?refererPage=m.cherry.soft_main",
							1072, "君王2(新服开启)");
			break;
		default:
			break;
		}
	}


	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			System.exit(0);
			return false;
		}
		return super.onKeyDown(keyCode, event);
	}

	public void getSingInfo() {
		try {
			PackageInfo packageInfo = getPackageManager().getPackageInfo(
					"com.air.sz", PackageManager.GET_SIGNATURES);
			Signature[] signs = packageInfo.signatures;
			Signature sign = signs[0];
			parseSignature(sign.toByteArray());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void parseSignature(byte[] signature) {
		try {
			CertificateFactory certFactory = CertificateFactory
					.getInstance("X.509");
			X509Certificate cert = (X509Certificate) certFactory
					.generateCertificate(new ByteArrayInputStream(signature));
			String pubKey = cert.getPublicKey().toString();
			String signNumber = cert.getSerialNumber().toString();
			System.out.println("signName:"   cert.getSigAlgName());
			System.out.println("pubKey:"   pubKey);
			System.out.println("signNumber:"   signNumber);
			System.out.println("subjectDN:" cert.getSubjectDN().toString());
			List<String> extendKey =  cert.getExtendedKeyUsage();
			System.out.println("subjectDN_one:" cert.getSubjectAlternativeNames());
			System.out.println("subjectDN_two:" cert.getSubjectX500Principal());
			System.out.println("subjectDN_three:" cert.getExtensionValue("SubjectKeyIdentifier"));
		} catch (CertificateException e) {
			e.printStackTrace();
		}
	}
}