Android 异步任务 代码很简短，简单异步工具封装，方便执行异步任务

<pre name="code" class="java">package com.ferris.pool;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FerrisPoolManager {
private ExecutorService service;

private FerrisPoolManager() {
int num = Runtime.getRuntime().availableProcessors();
service = Executors.newFixedThreadPool(num * 2);
}

private static FerrisPoolManager manager;

public static FerrisPoolManager getInstance() {
if (manager == null) {
synchronized (FerrisPoolManager.class) {
if(manager == null) {
manager = new FerrisPoolManager();
}
}
}
return manager;
}

public void addTask(Runnable runnable) {
service.execute(runnable);
}
public void cancelTask(){
service.shutdown();
}
}

package com.ferris.pool;

public interface FerrisTaskListem {
public void get();  //运行在线程里

public void update(); //运行在主线程（从哪里new就是哪个线程，也不一定是主线程service等）
}

package com.ferris.pool;

import android.os.Handler;
import android.os.Message;

public class FerrisTask {
private FerrisTaskListem taskListem;
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if(taskListem!=null){
taskListem.update();
}
};
};

public FerrisTask(FerrisTaskListem taskListem) {
this.taskListem = taskListem;
}

public void Execute(){
FerrisPoolManager.getInstance().addTask(new RunTask());
}

public class RunTask implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
if(taskListem!=null){
taskListem.get();
}
Message message=Message.obtain();
handler.sendMessage(message);

}
}

}

FerrisTask ferrisTask = new FerrisTask(new FerrisTaskListem() {
@Override
public void update() {  //主线程
// TODO Auto-generated method stub
String name = Thread.currentThread().getName();
System.out.print(name);
}

@Override
public void get() { //UI线程
// TODO Auto-generated method stub
String name = Thread.currentThread().getName();
System.out.print(name);

}
});
ferrisTask.Execute();