android 后台附件下载

在service中通过在oncreat（）中开启一个线程，轮训ArrayList<AttachmentTask> 我这个附件下载的任务list ，ArrayList<AttachmentTask> 他维护的是一个当前下载的任务，每当下载完一个移除一个，同时下载完后添加到数据库。

/*
 * @project C6Client
 * @package com.jh.c6.service
 * @file DownloadService.java
 * @version  1.0
 * @author  liaoyp
 * @time  2012-5-17 上午2:55:19
 */
package com.jh.c6.service;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.widget.Toast;

import com.jh.c6.activity.C6ClientActivity;
import com.jh.c6.activity.DownloadMangerActivity;
import com.jh.c6.activity.R;
import com.jh.c6.entity.AttachmentTask;
import com.jh.c6.exception.POAException;
import com.jh.c6.impl.DownloadDB;
import com.jh.c6.util.Configure;

public class DownloadService  extends Service implements Runnable{

	private NotificationManager manager;
	private Notification notif;
	private Intent intent;
	Handler  handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			if(msg.what == 1){
				Toast.makeText(getApplicationContext(), "该附件已下载", 500).show();
				startActivity();
			}else if(msg.what == 2){
				startActivity();
				Toast.makeText(getApplicationContext(), "该附件正在下载", 500).show();
			}else if(msg.what == 3){
//				startActivity();
				Toast.makeText(getApplicationContext(), "服务器不存在该附件！", 500).show();
			}else{
				manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
				Notification notification = new Notification(R.drawable.ic_launcher,"附件下载中",System.currentTimeMillis());
				intent = new Intent();
				intent.setClass(getApplicationContext(), DownloadMangerActivity.class);
				intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP| Intent.FLAG_ACTIVITY_NEW_TASK);

				PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(),
						100, intent, PendingIntent.FLAG_UPDATE_CURRENT);
				notification.setLatestEventInfo(getApplicationContext(), "附件下载", "下载完成！", pendingIntent);
				manager.notify(101, notification);
				Toast.makeText(getApplicationContext(), "下载完成", 500).show();
			}

		};
	};
	//static LinkedList<AttachmentTask> attsTask = new LinkedList<AttachmentTask>();
	 public static ArrayList<AttachmentTask> attsTask = new ArrayList<AttachmentTask>();
	 public void  startActivity(){
			intent = new Intent();
			intent.setClass(getApplicationContext(), DownloadMangerActivity.class);
			intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP| Intent.FLAG_ACTIVITY_NEW_TASK);
    		DownloadService.this.startActivity(intent);
	 }
	public  boolean isRun;
	public   final  static int  Max = 4;
	public  static boolean stopDownload;

	static final Object NO_MORE_WORK = new Object();

	private Thread t;

	private DownloadDB downloadDB;

	private Intent download;
	private File file;

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}
	/**
	 * 最大限制
	 * @return
	 */
	public static boolean  IsMaxNum (){
		return attsTask.size()>=Max? true:false;
	}
	/**
	 * 任务列表中是否存在还任务
	 * @param path
	 * @return
	 */
	public  static boolean isDownLoading(String path){
		for (int i = 0; i < attsTask.size(); i++) {
			if(attsTask.get(i).getUri().equals(path)){
				return true;
			}
		}
		return false;
	}
	/**
	 *
	 * <code>getTask</code>
	 * @description: TODO(获取附件总数)
	 * @return
	 * @since   2012-4-18    liaoyp
	 */
	public static  int getTask(){
		if(UploadService.attsTask !=null)
		return attsTask.size();
		else
			return 0;
	}
	/**
	 * 是否下载完成！
	 * @return
	 */
	public   static boolean   isDowloadFinshed(){
			for (int i = 0; i < attsTask.size(); i++) {
					if(!attsTask.get(i).isOver()){
							return false;
					}
			}
			return true;
	}
	/**
	 * 服务器地址
	 * @return
	 */
	public static List<String>  getDownloadServerPath(){
		List<String> atts = null;
		if(attsTask !=null && attsTask.size()>0){
			 atts = new ArrayList<String>();
			for (int i = 0; i < attsTask.size(); i++) {
				if(attsTask.get(i).isOver()){
					atts.add(attsTask.get(i).getServerPath());
				}
			}
			return atts;
		}
		return atts;
	}

	@Override
	public void onCreate() {
		super.onCreate();
		 isRun= true;
		 t = new Thread(this);
		 t.start();
	}
	@Override
	public void onStart(Intent intent, int startId) {
		// TODO Auto-generated method stub
		super.onStart(intent, startId);
		if(intent !=null &&intent.getExtras() !=null){

			if(t == null){
				 t = new Thread(this);
				 t.start();
			}

			String  uri = (String) intent.getExtras().get("uri");
			if(uri !=null){
				for (int i = attsTask.size() -1; i >= 0; i--) {
					if(attsTask.get(i).getUri().equals(uri)){
						stopDownload = true;
						attsTask.remove(i);
						System.out.println("cancle ---->"+attsTask.size());
						this.sendBroadcast(new Intent(C6ClientActivity.updateDowload));
					}
				}
			}
		}

	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		return super.onStartCommand(intent, flags, startId);
	}

	@Override
	public void run() {
		while(isRun)
		{
			try {
				if (attsTask.size() > 0) {
					for (int i = 0; i <attsTask.size(); i++) {
						AttachmentTask task = attsTask.get(i);
						if(! task.isUnSart()){
							download(attsTask.get(i));
						}
					}
				}
				else {
					try {
						Thread.sleep(500);
					} catch (Exception e) {
					}
				}
		}catch(Exception e){
			System.out.println("error-----------------"+e);
		}
		}
	}
	private void download(AttachmentTask task) throws POAException {
		// TODO Auto-generated method stub
		// 开始上传 和 更新下载的进度显示
		System.out.println("dowenload-----------------1");
		task.setUnSart(true);
		task.setSarting(true);
		if(downloadDB == null){
			downloadDB = new   DownloadDB();
		}
		String httpPath ;
		httpPath = task.getUri();
	    String   loacalPath = downloadDB.getLocalpicPath(DownloadService.this, httpPath);
	    System.out.println("localPath : "+loacalPath);
	    if(loacalPath == null){
	    		boolean b = isDownLoading(httpPath);
	    		if(b){
	    			// 发送广播通知
	    			removeTask(task);
	    			handler.sendEmptyMessage(2);
	    		}else{
	    			// 下载
	    			startDowload(task);
	    		}
//	        Toast.makeText(getApplicationContext(), "开始下载", 500).show();

	    	startDowload(task);

	    }else{
	    	 File file = new File(loacalPath);
	    	 if( ! file.exists()){
	    		  // 下载
	    		 startDowload(task);
	    	 }else{
	    		 // 跳到附件管理界面
	    		removeTask(task);
	    		 handler.sendEmptyMessage(1);
	    	 }
	    }

	}

	public void startDowload(AttachmentTask task){
		InputStream is = null;
		FileOutputStream fos = null;
		String httpPath = "";
		try {
			httpPath = (Configure.IPADDRESS.replaceAll("POSTServiceForAndroid.svc", "")+"FileOutSteam.aspx?FileID="+
					task.getUri());
			System.out.println("http: "+httpPath);

			URLConnection  connetion = new URL(httpPath).openConnection();
			 is=connetion.getInputStream();
//			HttpGet httpGet = new HttpGet(task.getUri());
//			HttpClient client = new DefaultHttpClient();
//			HttpParams httpParams = client.getParams();
//			HttpConnectionParams.setConnectionTimeout(httpParams,5000);
//			HttpConnectionParams.setSoTimeout(httpParams, 10000);
//			HttpResponse httpResponse = client.execute(httpGet);

//			if (httpResponse.getStatusLine().getStatusCode() == 200) {
//
//				 is = httpResponse.getEntity().getContent();

				// 开始下载apk文件
				 String path = 	Configure.DATADIR+Configure.DownloadFile + "/"+task.getServerPath();
				 file = new File(path);
				  if( ! file.exists()){
					  file.createNewFile();
				  }
				 fos = new FileOutputStream(file);

				byte[] buffer = new byte[2048];
				int count = 0;
				while ((count = is.read(buffer)) != -1) {
					if (stopDownload) {
						 break ;
					}
					fos.write(buffer, 0, count);

					// 进行进度跟新
				  	long  current= task.getCurrentProgress();
					current =task.getCurrentProgress() +count;
					task.setCurrentProgress(current);

					// send broadCast  to mangeAttachmengActivity
					download = new Intent(C6ClientActivity.DowloadAction);
					download.putExtra("type", 0);
					this.sendBroadcast(download);
					System.out.println("下载中......");
				}
				fos.flush();
				removeTask(task);
				if(downloadDB != null){
					downloadDB.insertPic(DownloadService.this, task.getUri(),path, Configure.ACCOUNTID);
				}else{
					new DownloadDB().insertPic(DownloadService.this, task.getUri(),path, Configure.ACCOUNTID);
				}
				//  提示下载完成 ！
//				download = new Intent(C6ClientActivity.DowloadAction);
//				download.putExtra("type", 1);
//				this.sendBroadcast(download);
				handler.sendEmptyMessage(0);
			}catch (FileNotFoundException e) {
				e.printStackTrace();
				handler.sendEmptyMessage(3);
			}catch (IOException e) {
				e.printStackTrace();
			} finally{
				try {
					if (fos != null) {
						fos.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
				try {
					if (is != null) {
						 is.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
	}

	public static  void removeTask(AttachmentTask task){
		if(attsTask.contains(task)){
			attsTask.remove(task);
		}
	}
	public static  void  addTask(AttachmentTask task){
		stopDownload = false;
		attsTask.add(task);
	}

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