Android asynchronous task code is very short, simple asynchronous tool encapsulation, easy to execute asynchronous tasks

Android asynchronous task code is very short, simple asynchronous tool encapsulation, easy to execute asynchronous tasks

It is relatively simple. There are three classes.

1. Create a single-instance thread pool to execute asynchronous tasks

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();}}



2. Define a task interface
Package com. ferris. pool; public interface FerrisTaskListem {public void get (); // run public void update () in the thread; // run in the main thread (where is the new thread, not necessarily the main thread service )}


3. task execution object
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 {@Overridepublic void run() {// TODO Auto-generated method stubif(taskListem!=null){taskListem.get();}Message message=Message.obtain();handler.sendMessage(message);}}}


4. Usage

FerrisTask ferrisTask = new FerrisTask (new FerrisTaskListem () {@ Overridepublic void update () {// main Thread // TODO Auto-generated method stubString name = Thread. currentThread (). getName (); System. out. print (name) ;}@ Overridepublic void get () {// UI Thread // TODO Auto-generated method stubString name = Thread. currentThread (). getName (); System. out. print (name) ;}}); ferrisTask. execute ();