远程service下载，使用aidl，队列下载service端

使用远程service下载能够分摊应用的压力，实现模块化，减少程序的耦合性

首先是aidl文件，通过aidl来进行进程间交互

package com.server;import com.server.DownCallBack;对外提供的接口aidlinterface SupportFunction {String getAppListUrl();void regCallback(in DownCallBack callBack);void unregCallback(in DownCallBack callBack);void startDown(String url);}

下面是回调进度的aidl

package com.server;
interface DownCallBack {
void progress(String key,float porg);
}

这个aidl有服务的调用端实现，来实现进度的传输

下面是service实现

package com.server;import java.util.ArrayList;import java.util.List;import java.util.concurrent.locks.ReentrantLock;import android.app.Service;import android.content.Intent;import android.net.Uri;import android.os.Handler;import android.os.IBinder;import android.os.RemoteCallbackList;import android.os.RemoteException;import android.util.SparseArray;/** * 提供服务的实现类 * @author Jack * */public class MyServer extends Service {private RemoteCallbackList<DownCallBack> mCallback = new RemoteCallbackList<DownCallBack>();private List<String> downs = new ArrayList<String>();private ReentrantLock lock = new ReentrantLock();private MyThreadPool pool = null;private SparseArray<DownLoadThread> tasks = new SparseArray<DownLoadThread>();private boolean isRunningTask = false;private Handler handler = new Handler(){public void handleMessage(android.os.Message msg) {String finshTask = (String) msg.obj;tasks.put(downs.indexOf(finshTask), null);tasks.size();isRunningTask = false;Intent intent = new Intent(Intent.ACTION_VIEW);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setDataAndType(Uri.parse("file://"+msg.getData().getString("file")), "application/vnd.android.package-archive");startActivity(intent);executorTask();}};@Overridepublic void onCreate() {super.onCreate();pool = MyThreadPool.getInstance();}class FunctionImpl extends SupportFunction.Stub{@Overridepublic String getAppListUrl() throws RemoteException {return "你的app下载列表";}@Overridepublic void startDown(String url) throws RemoteException {if(!downs.contains(url)){downs.add(url);tasks.append(downs.indexOf(url), new DownLoadThread(url,mCallback,lock,handler));//添加任务executorTask();}}@Overridepublic void regCallback(DownCallBack callBack) throws RemoteException {if(callBack!=null){mCallback.register(callBack);}}@Overridepublic void unregCallback(DownCallBack callBack) throws RemoteException {if(callBack!=null){mCallback.unregister(callBack);}}}private void executorTask(){if(isRunningTask){return;}for(int i = 0;i<tasks.size();i++){DownLoadThread t = tasks.get(i);if(t!=null){//当前有任务，执行当前任务并且中断当前循环pool.exector(t);isRunningTask = true;break;}}}private FunctionImpl function = new FunctionImpl();@Overridepublic IBinder onBind(Intent intent) {System.out.println("bind server");return function;}}

下面是提供下载的线程<pre name="code" class="java">package com.server;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.util.concurrent.locks.ReentrantLock;import android.os.Handler;import android.os.Message;import android.os.RemoteCallbackList;import android.os.RemoteException;public class DownLoadThread implements Runnable {private String urlString;private RemoteCallbackList<DownCallBack> mCallLists;private ReentrantLock lock;private Handler handler;public DownLoadThread(String url,RemoteCallbackList<DownCallBack> mCallLists,ReentrantLock lock,Handler handler) {this.urlString = url;this.mCallLists = mCallLists;this.lock = lock;this.handler = handler;}@Overridepublic void run() {try {URL url = new URL(urlString);URLConnection conn = url.openConnection();String name = getFileName();File file = new File("/mnt/sdcard/" + name);int fileLength = conn.getContentLength();System.out.println(file.toString());conn.setConnectTimeout(6000);InputStream is = conn.getInputStream();FileOutputStream fos = new FileOutputStream(file);byte[] buf = new byte[1024*8];int len = 0;int count = 0;lock.lock();//当前只有一个线程能同步进度while ((len = is.read(buf)) != -1) {fos.write(buf, 0, len);float progress = (float)(count+=len)/fileLength;sendProgress(progress, fileLength);if(progress==1){System.out.println("完成，需要发送消息");Message msg = handler.obtainMessage();msg.getData().putString("file", file.getAbsolutePath());msg.obj = urlString;handler.sendMessage(msg);}}fos.close();is.close();} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{lock.unlock();}}public void sendProgress(float len,int fileLength){int i = mCallLists.beginBroadcast();//while(i >0){//i--;try {mCallLists.getBroadcastItem(0).progress(urlString,len);} catch (RemoteException e) {e.printStackTrace();}//}mCallLists.finishBroadcast();}public String getFileName() {String temp = urlString.split("//")[1];String[] names = temp.split("/");return names[names.length - 1];}}

由线程池来执行任务

<pre name="code" class="java">package com.server;import java.util.List;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.TimeUnit;public class MyThreadPool {private static MyThreadPool pool  = new MyThreadPool();private ExecutorService service;private MyThreadPool(){service =Executors.newFixedThreadPool(1);}public static MyThreadPool getInstance(){return pool;}public void exector(Runnable task){service.execute(task);}public void shutDownThread() throws InterruptedException{service.awaitTermination(5, TimeUnit.SECONDS);List<Runnable> tasks = service.shutdownNow();//执行任务后的剩下的未执行的任务if(tasks.size()==0){//当前没有执行中的任务}}}

只提供了单任务的下载，并没有提供多任务同时下载，同步起来比较麻烦，有时间在完善