Android线程池使用

超、凢脫俗 2022-07-26 11:23 73阅读 0赞

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标签： [ Android 线程池][Android]

2015-01-06 12:38 208人阅读 [ 评论][Link 1](0)  收藏 [ 举报][Link 2]

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前一篇博文讲了Android线程的创建和启动，创建有继承Thread类、实现Runnable接口、实现Callable接口等三种方法，启动都是调用了Start()方法来启动的，其实还可以用线程池来启动线程。

系统启动一个新线程的成本是比较高的，因为它涉及与操作系统交互。在这种情形下，使用线程池可以很好地提高性能，尤其是当程序中需要创建大量生存期很短暂的线程时，更应该考虑使用线程池。

效果图

![20150106125130880][]

ThreadPoolActivity.java

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1.  package com.example.androidthreadpool;
2.  
3.  import java.util.concurrent.Callable;
4.  import java.util.concurrent.ExecutionException;
5.  import java.util.concurrent.ExecutorService;
6.  import java.util.concurrent.Executors;
7.  import java.util.concurrent.FutureTask;
8.  import java.util.concurrent.ScheduledExecutorService;
9.  import java.util.concurrent.TimeUnit;
10. 
11. import android.os.Bundle;
12. import android.app.Activity;
13. import android.view.Menu;
14. import android.widget.TextView;
15. 
16. public class ThreadPoolActivity extends Activity
17. \{
18. TextView txtShow1;
19. @Override
20. protected void onCreate(Bundle savedInstanceState)
21. \{
22. super.onCreate(savedInstanceState);
23. setContentView(R.layout.activity\_thread\_pool);
24. txtShow1=(TextView)findViewById(R.id.txtShow1);
25. //创建一个线程池
26. ExecutorService pool1=Executors.newFixedThreadPool(2);
27. //将一个Runnable对象传递给线程池
28. FirstThread ft=new FirstThread();
29. pool1.submit(ft);
30. //将一个Callable对象传递给线程池
31. FutureTask<String> task=new FutureTask<String>(new SecondThread());
32. pool1.submit(task);
33. //创建一个具有延迟启动线程功能的线程池
34. ScheduledExecutorService pool2=Executors.newScheduledThreadPool(2);
35. //延迟1秒启动线程
36. pool2.schedule(ft, 1, TimeUnit.SECONDS);
37. \}
38. 
39. @Override
40. public boolean onCreateOptionsMenu(Menu menu) \{
41. // Inflate the menu; this adds items to the action bar if it is present.
42. getMenuInflater().inflate(R.menu.thread\_pool, menu);
43. return true;
44. \}
45. //实现Runnable接口创建线程类
46. public class FirstThread implements Runnable
47. \{
48. @Override
49. public void run()
50. \{
51. txtShow1.append(Thread.currentThread().getName()+" implements Runnable"\+"\\n");
52. \}
53. \}
54. //使用Callable和Future创建线程类
55. public class SecondThread implements Callable<String>
56. \{
57. public String call()
58. \{
59. txtShow1.append(Thread.currentThread().getName()+" implements Callable"\+"\\n");
60. return " implements Callable";
61. \}
62. \}
63. \}

[Android]: http://www.csdn.net/tag/Android%20%e7%ba%bf%e7%a8%8b%e6%b1%a0
[Link 1]: http://blog.csdn.net/shenyuanqing/article/details/42457135#comments
[Link 2]: http://blog.csdn.net/shenyuanqing/article/details/42457135#report
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