android基础--线程池

        线程池、线程的高效率使用,灵活控制!这里用最常用的几种方式来分别实现应用中使用的线程方面的知识,(共写了两个不同入口的Activity来分开不同的实现方式,大家可以自行注释AndroidManifest.xml中的Launch入口或打开注释)好了,先随便列几个吧,如:AsyncTask 、Runnable 、Thread、ThreadPool、 Executors等等的使用

一:无大小限制的线程池执行效果如下

二:限制按顺序来执行任务的线程池效果如下

三:一个一个任务的执行线程池效果如下(与按顺序执行效果是一样的,只是内部实现稍有不同)

四:按指定个数来执行任务的线程池效果如下

五:创建一个可在指定时间里执行任务的线程池,亦可重复执行,不常用,效果与四相同

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六:按指定工厂模式来执行的线程池,效果与四、五一样,但用方式六创建的线程池都有在工厂中指定的线程属性,

比如:线程名字、是否为用户线程等等属性

七:线程池中任务执行时可暂停效果图如下

八:用Runnable、ConcurrentLinkedQueue、ConcurrentMap、Future、ExecutorService关联实现的效果图如下

(备注:为了写文章加注释还有查找的时候方便,把所有的主类及辅助类以内部类的形式写到一个.java文件里面了,如果朋友们觉得看着乱,不爽的话,可以自行将里面的类抽取到单独的.java文件中,几分钟搞定的事!)

方式一(纯ExecutorService、AsyncTask、Runnable关联实现相关文件如下):

         1.1:主类文件(Main.java)

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/*

* FileName:  Main.java

* Description:  <description>

* Modify Date:   2013-10-15

* Follow Order No.:  <Follow Order No.>

* Modify Order No.:  <Modify Order No.>

* Modify Content:  <modify content >

*/

package com.xxxx.threadpooltest;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.ThreadFactory;

import android.annotation.TargetApi;

import android.app.Activity;

import android.content.Context;

import android.os.AsyncTask;

import android.os.Build;

import android.os.Bundle;

import android.os.SystemClock;

import android.util.AttributeSet;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.Toast;

/**

* @TODO [The Class File Description]

* @version [version-code, 2013-10-15]

* @since [Product/module]

*/

@TargetApi(Build.VERSION_CODES.HONEYCOMB)

public class Main extends Activity

{

    private static int order = 0;

    /** 总共多少任务(根据CPU个数决定创建活动线程的个数,这样取的好处就是可以让手机承受得住) */

    // private static final int count = Runtime.getRuntime().availableProcessors() * 3 + 2;

    /** 总共多少任务(为了效果明显,所以写死了为10个,如果在手机上的话,推荐使用上面的那个count) */

    private static final int count = 10;

    /** 每次只执行一个任务的线程池 */

    private static ExecutorService singleTaskExecutor = null;

    /** 每次执行限定个数个任务的线程池 */

    private static ExecutorService limitedTaskExecutor = null;

    /** 所有任务都一次性开始的线程池 */

    private static ExecutorService allTaskExecutor = null;

    /** 创建一个可在指定时间里执行任务的线程池,亦可重复执行 */

    private static ExecutorService scheduledTaskExecutor = null;

    /** 创建一个可在指定时间里执行任务的线程池,亦可重复执行(不同之处:使用工程模式) */

    private static ExecutorService scheduledTaskFactoryExecutor = null;

    private List<AsyncTaskTest> mTaskList = null;

    /** 任务是否被取消 */

    private boolean isCancled = false;

    /** 是否点击并取消任务标示符 */

    private boolean isClick = false;

    /** 线程工厂初始化方式一 */

    ThreadFactory tf = Executors.defaultThreadFactory();

    /** 线程工厂初始化方式二 */

    private static class ThreadFactoryTest implements ThreadFactory

    {

        @Override

        public Thread newThread(Runnable r)

        {

            Thread thread = new Thread(r);

            thread.setName("xxxxx_ThreadFactory");

            thread.setDaemon(true); // 将用户线程变成守护线程,默认false

            return thread;

        }

    }

    static

    {

        singleTaskExecutor = Executors.newSingleThreadExecutor();// 每次只执行一个线程任务的线程池

        limitedTaskExecutor = Executors.newFixedThreadPool(3);// 限制线程池大小为7的线程池

        allTaskExecutor = Executors.newCachedThreadPool(); // 一个没有限制最大线程数的线程池

        scheduledTaskExecutor = Executors.newScheduledThreadPool(3);// 一个可以按指定时间可周期性的执行的线程池

        scheduledTaskFactoryExecutor = Executors.newFixedThreadPool(3, new ThreadFactoryTest());// 按指定工厂模式来执行的线程池

        scheduledTaskFactoryExecutor.submit(new Runnable()

        {

            @Override

            public void run()

            {

                Log.i("KKK", "This is the ThreadFactory Test  submit Run! ! ! ");

            }

        });

    };

    @Override

    public void onCreate(Bundle icicle)

    {

        super.onCreate(icicle);

        setContentView(R.layout.demo);

        final ListView taskList = (ListView)findViewById(R.id.task_list);

        taskList.setAdapter(new AsyncTaskAdapter(getApplication(), count));

        taskList.setOnItemClickListener(new OnItemClickListener()

        {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id)

            {

                if (position == 0) // 以第一项为例,来测试关闭线程池

                {

                    /**

                     * 会关闭线程池方式一:但不接收新的Task,关闭后,正在等待 执行的任务不受任何影响,会正常执行,无返回值!

                     */

                    // allTaskExecutor.shutdown();

                    /**

                     * 会关闭线程池方式二:也不接收新的Task,并停止正等待执行的Task

                     * (也就是说, 执行到一半的任务将正常执行下去),最终还会给你返回一个正在等待执行但线程池关闭

                     * 却没有被执行的Task集合!

                     */

                    List<Runnable> unExecRunn = allTaskExecutor.shutdownNow();

                    for (Runnable r : unExecRunn)

                    {

                        Log.i("KKK", "未执行的任务信息:=" + unExecRunn.toString());

                    }

                    Log.i("KKK", "Is shutdown ? = " + String.valueOf(allTaskExecutor.isShutdown()));

                    allTaskExecutor = null;

                }

                // 以第二项为例来测试是否取消执行的任务

                AsyncTaskTest sat = mTaskList.get(1);

                if (position == 1)

                {

                    if (!isClick)

                    {

                        sat.cancel(true);

                        isCancled = true;

                        isClick = !isClick;

                    }

                    else

                    {

                        sat.cancel(false);

                        isCancled = false;

                        // isClick = false;

                        isClick = !isClick;

                        if (null != sat && sat.getStatus() == AsyncTask.Status.RUNNING)

                        {

                            if (sat.isCancelled())

                            {

                                sat = new AsyncTaskTest(sat.mTaskItem);

                            }

                            else

                            {

                                Toast.makeText(Main.this, "A task is already running, try later", Toast.LENGTH_SHORT).show();

                            }

                        }

                        /**

                         * 由于上面测试关闭,在不重新生成allTaskExecutor的同时,会报异常(没有可以使用的线程池,

                         * 故此处重新生成线程池对象)

                         */

                        if (allTaskExecutor == null)

                        {

                            allTaskExecutor = Executors.newCachedThreadPool();

                        }

                        sat.executeOnExecutor(allTaskExecutor); // The task is already running(这也是个异常哦,小心使用! )

                    }

                }

                else

                {

                    sat.cancel(false);

                    isCancled = false;

                    // sat.execute(sat.mTaskItem);

                    // sat.executeOnExecutor(allTaskExecutor);

                }

            }

        });

    }

    /**

     * @TODO [ListView Item的条目适配器]

     * @version [version-code, 2013-10-22]

     * @since [Product/module]

     */

    private class AsyncTaskAdapter extends BaseAdapter

    {

        private Context mContext;

        private LayoutInflater mFactory;

        private int mTaskCount;

        public AsyncTaskAdapter(Context context, int taskCount)

        {

            mContext = context;

            mFactory = LayoutInflater.from(mContext);

            mTaskCount = taskCount;

            mTaskList = new ArrayList<AsyncTaskTest>(taskCount);

        }

        @Override

        public int getCount()

        {

            return mTaskCount;

        }

        @Override

        public Object getItem(int position)

        {

            return mTaskList.get(position);

        }

        @Override

        public long getItemId(int position)

        {

            return position;

        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent)

        {

            if (convertView == null)

            {

                convertView = mFactory.inflate(R.layout.list_view_item, null);

                AsyncTaskTest task = new AsyncTaskTest((MyListItem)convertView);

                /**

                 * 下面两种任务执行效果都一样,形变质不变

                 * */

                // task.execute();

                // task.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR);

                /**

                 * 下面的方式在小于API 11级时效果是一样的,但在高版本中的稍微有点不同,可以看以下AsyncTask

                 * 核心变量的定义就知道了使用如下

                 * 方式时,系统会默认的采用五个一组,五个一组的方式来执行我们的任务,

                 * 定义在:AsyncTask.class中,private static final int CORE_POOL_SIZE = 5;

                 * */

                // use AsyncTask#THREAD_POOL_EXECUTOR is the same to older version #execute() (less than API 11)

                // but different from newer version of #execute()

                // task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);

                /**

                 * 一个一个执行我们的任务,效果与按顺序执行是一样的(AsyncTask.SERIAL_EXECUTOR)

                 * */

                // task.executeOnExecutor(singleTaskExecutor);

                /**

                 * 按我们指定的个数来执行任务的线程池

                 * */

                // task.executeOnExecutor(limitedTaskExecutor);

                /**

                 * 不限定指定个数的线程池,也就是说:你往里面放了几个任务,他全部同一时间开始执行,

                 * 不管你手机受得了受不了

                 * */

                task.executeOnExecutor(allTaskExecutor);

                /**

                 * 创建一个可在指定时间里执行任务的线程池,亦可重复执行

                 * */

                // task.executeOnExecutor(scheduledTaskExecutor);

                /**

                 * 创建一个按指定工厂模式来执行任务的线程池,可能比较正规,但也不常用

                 */

                // task.executeOnExecutor(scheduledTaskFactoryExecutor);

                mTaskList.add(task);

            }

            return convertView;

        }

    }

    class AsyncTaskTest extends AsyncTask<Void, Integer, Void>

    {

        private MyListItem mTaskItem;

        private String id;

        private AsyncTaskTest(MyListItem item)

        {

            mTaskItem = item;

            if (order < count || order == count)

            {

                id = "执行:" + String.valueOf(++order);

            }

            else

            {

                order = 0;

                id = "执行:" + String.valueOf(++order);

            }

        }

        @Override

        protected void onPreExecute()

        {

            mTaskItem.setTitle(id);

        }

        /**

         * Overriding methods

         */

        @Override

        protected void onCancelled()

        {

            super.onCancelled();

        }

        @Override

        protected Void doInBackground(Void... params)

        {

            if (!isCancelled() && isCancled == false) // 这个地方很关键,如果不设置标志位的话,直接setCancel(true)是无效的

            {

                int prog = 0;

                /**

                 * 下面的while中,写了个分支用来做个假象(任务东西刚开始下载的时候,速度快,

                 * 快下载完成的时候就突然间慢了下来的效果, 大家可以想象一下,类似:PP手机助手、91手机助手中

                 * 或其它手机应用中,几乎都有这个假象,开始快,结束时就下载变慢了,讲白了 就是开发的人不想让你

                 * 在下载到大于一半的时候,也就是快下载完的时候去点取消,你那样得多浪费!所以造个假象,

                 * 让你不想去取消而已)

                 */

                while (prog < 101)

                {

                    if ((prog > 0 || prog == 0) && prog < 70) // 小于70%时,加快进度条更新

                    {

                        SystemClock.sleep(100);

                    }

                    else

                    // 大于70%时,减慢进度条更新

                    {

                        SystemClock.sleep(300);

                    }

                    publishProgress(prog); // 更新进度条

                    prog++;

                }

            }

            return null;

        }

        @Override

        protected void onPostExecute(Void result)

        {

        }

        @Override

        protected void onProgressUpdate(Integer... values)

        {

            mTaskItem.setProgress(values[0]); // 设置进度

        }

    }

}

/**

* @TODO [一个简单的自定义 ListView Item]

* @version [version-code, 2013-10-22]

* @since [Product/module]

*/

class MyListItem extends LinearLayout

{

    private TextView mTitle;

    private ProgressBar mProgress;

    public MyListItem(Context context, AttributeSet attrs)

    {

        super(context, attrs);

    }

    public MyListItem(Context context)

    {

        super(context);

    }

    public void setTitle(String title)

    {

        if (mTitle == null)

        {

            mTitle = (TextView)findViewById(R.id.task_name);

        }

        mTitle.setText(title);

    }

    public void setProgress(int prog)

    {

        if (mProgress == null)

        {

            mProgress = (ProgressBar)findViewById(R.id.task_progress);

        }

        mProgress.setProgress(prog);

    }

}

1.2:布局文件

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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingLeft="10dip"

    android:paddingRight="10dip"

    android:orientation="vertical" >

    <ListView android:id="@+id/task_list"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:divider="#cccccc"

        android:dividerHeight="0.6dip"

        android:footerDividersEnabled="true"

        android:headerDividersEnabled="true" />

</LinearLayout>

方式二(Runnable、ConcurrentLinkedQueue、ConcurrentMap、Future、ExecutorService关联实现的相关文件如 下):

          2.1:主类文件(MyRunnableActivity.java)

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/*

* FileName:  MyRunnableActivity.java

* CopyRight:  Belong to  <xxxxx Technologies > own

* Description:  <description>

* Modify Date:   2013-10-21

* Follow Order No.:  <Follow Order No.>

* Modify Order No.:  <Modify Order No.>

* Modify Content:  <modify content >

*/

package com.xxxxx.threadpooltest;

import java.util.Iterator;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.ConcurrentLinkedQueue;

import java.util.concurrent.ConcurrentMap;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.ProgressBar;

import android.widget.Toast;

/**

* @TODO [线程池控制 ]

* @version [version-code, 2013-10-22]

* @since [Product/module]

*/

public class MyRunnableActivity extends Activity implements OnClickListener

{

    /** 任务执行队列 */

    private ConcurrentLinkedQueue<MyRunnable> taskQueue = null;

    /**

     * 正在等待执行或已经完成的任务队列

     *

     * 备注:Future类,一个用于存储异步任务执行的结果,比如:判断是否取消、是否可以取消、

     * 是否正在执行、是否已经完成等

     *

     * */

    private ConcurrentMap<Future, MyRunnable> taskMap = null;

    /**

     * 创建一个不限制大小的线程池 此类主要有以下好处

     * 1,以共享的无界队列方式来运行这些线程.

     * 2,执行效率高。

     * 3,在任意点,在大多数 nThreads 线程会处于处理任务的活动状态

     * 4,如果在关闭前的执行期间由于失败而导致任何线程终止,那么一个新线程将代替它执行后续的任务(如果需要)。

     *

     * */

    private ExecutorService mES = null;

    /** 在此类中使用同步锁时使用如下lock对象即可,官方推荐的,

     * 不推荐直接使用MyRunnableActivity.this类型的,可以详细读一下/framework/app下面的随便一个项目

     */

    private Object lock = new Object();

    /** 唤醒标志,是否唤醒线程池工作 */

    private boolean isNotify = true;

    /** 线程池是否处于运行状态(即:是否被释放!) */

    private boolean isRuning = true;

    /** 任务进度 */

    private ProgressBar pb = null;

    /** 用此Handler来更新我们的UI */

    private Handler mHandler = null;

    /**

     * Overriding methods

     *

     * @param savedInstanceState

     */

    @Override

    protected void onCreate(Bundle savedInstanceState)

    {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.my_runnable_main);

        init();

    }

    public void init()

    {

        pb = (ProgressBar)findViewById(R.id.progressBar1);

        findViewById(R.id.button1).setOnClickListener(this);

        findViewById(R.id.button2).setOnClickListener(this);

        findViewById(R.id.button3).setOnClickListener(this);

        findViewById(R.id.button4).setOnClickListener(this);

        findViewById(R.id.button5).setOnClickListener(this);

        taskQueue = new ConcurrentLinkedQueue<MyRunnable>();

        taskMap = new ConcurrentHashMap<Future, MyRunnable>();

        if (mES == null)

        {

            mES = Executors.newCachedThreadPool();

        }

        // 用于更新ProgressBar进度条

        mHandler = new Handler()

        {

            /**

             * Overriding methods

             *

             * @param msg

             */

            @Override

            public void handleMessage(Message msg)

            {

                super.handleMessage(msg);

                pb.setProgress(msg.what);

            }

        };

    }

    /**

     * Overriding methods

     *

     * @param v

     */

    @Override

    public void onClick(View v)

    {

        switch (v.getId())

        {

            case R.id.button1:

                start();

                break;

            case R.id.button2:

                stop();

                break;

            case R.id.button3:

                reload(new MyRunnable(mHandler));

                break;

            case R.id.button4:

                release();

                break;

            case R.id.button5:

                addTask(new MyRunnable(mHandler));

                break;

            default:

                break;

        }

    }

    /**

     * <Summary Description>

     */

    private void addTask(final MyRunnable mr)

    {

        mHandler.sendEmptyMessage(0);

        if (mES == null)

        {

            mES = Executors.newCachedThreadPool();

            notifyWork();

        }

        if (taskQueue == null)

        {

            taskQueue = new ConcurrentLinkedQueue<MyRunnable>();

        }

        if (taskMap == null)

        {

            taskMap = new ConcurrentHashMap<Future, MyRunnable>();

        }

        mES.execute(new Runnable()

        {

            @Override

            public void run()

            {

                /**

                 * 插入一个Runnable到任务队列中 这个地方解释一下,offer跟add方法,试了下,效果都一样,没区别,

                 * 官方的解释如下:

                 * 1 offer : Inserts the specified element at the tail of this queue. As the queue is unbounded,

                 * this method will never return {@code false}.

                 * 2 add: Inserts the specified element at the tail of this queue. As the queue is

                 * unbounded, this method will never throw {@link IllegalStateException} or return {@code false}.

                 * */

                taskQueue.offer(mr);

                // taskQueue.add(mr);

                notifyWork();

            }

        });

        Toast.makeText(MyRunnableActivity.this, "已添加一个新任务到线程池中 !", 0).show();

    }

    /**

     * <Summary Description>

     */

    private void release()

    {

        Toast.makeText(MyRunnableActivity.this, "释放所有占用的资源!", 0).show();

        /** 将ProgressBar进度置为0 */

        mHandler.sendEmptyMessage(0);

        isRuning = false;

        Iterator iter = taskMap.entrySet().iterator();

        while (iter.hasNext())

        {

            Map.Entry<Future, MyRunnable> entry = (Map.Entry<Future, MyRunnable>)iter.next();

            Future result = entry.getKey();

            if (result == null)

            {

                continue;

            }

            result.cancel(true);

            taskMap.remove(result);

        }

        if (null != mES)

        {

            mES.shutdown();

        }

        mES = null;

        taskMap = null;

        taskQueue = null;

    }

    /**

     * <Summary Description>

     */

    private void reload(final MyRunnable mr)

    {

        mHandler.sendEmptyMessage(0);

        if (mES == null)

        {

            mES = Executors.newCachedThreadPool();

            notifyWork();

        }

        if (taskQueue == null)

        {

            taskQueue = new ConcurrentLinkedQueue<MyRunnable>();

        }

        if (taskMap == null)

        {

            taskMap = new ConcurrentHashMap<Future, MyRunnable>();

        }

        mES.execute(new Runnable()

        {

            @Override

            public void run()

            {

                /** 插入一个Runnable到任务队列中 */

                taskQueue.offer(mr);

                // taskQueue.add(mr);

                notifyWork();

            }

        });

        mES.execute(new Runnable()

        {

            @Override

            public void run()

            {

                if (isRuning)

                {

                    MyRunnable myRunnable = null;

                    synchronized (lock)

                    {

                        myRunnable = taskQueue.poll(); // 从线程队列中取出一个Runnable对象来执行,如果此队列为空,则调用poll()方法会返回null

                        if (myRunnable == null)

                        {

                            isNotify = true;

                        }

                    }

                    if (myRunnable != null)

                    {

                        taskMap.put(mES.submit(myRunnable), myRunnable);

                    }

                }

            }

        });

    }

    /**

     * <Summary Description>

     */

    private void stop()

    {

        Toast.makeText(MyRunnableActivity.this, "任务已被取消!", 0).show();

        for (MyRunnable runnable : taskMap.values())

        {

            runnable.setCancleTaskUnit(true);

        }

    }

    /**

     * <Summary Description>

     */

    private void start()

    {

        if (mES == null || taskQueue == null || taskMap == null)

        {

            Log.i("KKK", "某资源是不是已经被释放了?");

            return;

        }

        mES.execute(new Runnable()

        {

            @Override

            public void run()

            {

                if (isRuning)

                {

                    MyRunnable myRunnable = null;

                    synchronized (lock)

                    {

                        // 从线程队列中取出一个Runnable对象来执行,如果此队列为空,则调用poll()方法会返回null

                        myRunnable = taskQueue.poll();

                        if (myRunnable == null)

                        {

                            isNotify = true;

                            // try

                            // {

                            // myRunnable.wait(500);

                            // }

                            // catch (InterruptedException e)

                            // {

                            // e.printStackTrace();

                            // }

                        }

                    }

                    if (myRunnable != null)

                    {

                        taskMap.put(mES.submit(myRunnable), myRunnable);

                    }

                }

            }

        });

    }

    private void notifyWork()

    {

        synchronized (lock)

        {

            if (isNotify)

            {

                lock.notifyAll();

                isNotify = !isNotify;

            }

        }

    }

}

   
   

2.2:辅助类(MyRunnable.java)

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/*

* FileName:  MyRunnable.java

* CopyRight:  Belong to  <xxxxx Technologies > own

* Description:  <description>

* Follow Order No.:  <Follow Order No.>

* Modify Order No.:  <Modify Order No.>

* Modify Content:  <modify content >

*/

package com.xxxxx.threadpooltest;

import android.os.Handler;

import android.os.SystemClock;

import android.util.Log;

/**

* @TODO [The Class File Description]

* @version [version-code, 2013-10-21]

* @since [Product/module]

*/

public class MyRunnable implements Runnable

{

    private boolean cancleTask = false;

    private boolean cancleException = false;

    private Handler mHandler = null;

    public MyRunnable(Handler handler)

    {

        mHandler = handler;

    }

    /**

     * Overriding methods

     */

    @Override

    public void run()

    {

        Log.i("KKK", "MyRunnable  run() is executed!!! ");

        runBefore();

        if (cancleTask == false)

        {

            running();

            Log.i("KKK", "调用MyRunnable run()方法");

        }

        runAfter();

    }

    /**

     * <Summary Description>

     */

    private void runAfter()

    {

        Log.i("KKK", "runAfter()");

    }

    /**

     * <Summary Description>

     */

    private void running()

    {

        Log.i("KKK", "running()");

        try

        {

            // 做点有可能会出异常的事情!!!

            int prog = 0;

            if (cancleTask == false && cancleException == false)

            {

                while (prog < 101)

                {

                    if ((prog > 0 || prog == 0) && prog < 70)

                    {

                        SystemClock.sleep(100);

                    }

                    else

                    {

                        SystemClock.sleep(300);

                    }

                    if (cancleTask == false)

                    {

                        mHandler.sendEmptyMessage(prog++);

                        Log.i("KKK", "调用 prog++ = " + (prog));

                    }

                }

            }

        }

        catch (Exception e)

        {

            cancleException = true;

        }

    }

    /**

     * <Summary Description>

     */

    private void runBefore()

    {

        // TODO Auto-generated method stub

        Log.i("KKK", "runBefore()");

    }

    public void setCancleTaskUnit(boolean cancleTask)

    {

        this.cancleTask = cancleTask;

        Log.i("KKK", "点击了取消任务按钮 !!!");

        // mHandler.sendEmptyMessage(0);

    }

}

2.3:布局文件

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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <Button

            android:id="@+id/button5"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="添加任务" />

        <Button

            android:id="@+id/button1"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="开始任务" />

        <Button

            android:id="@+id/button2"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="取消任务" />

        <Button

            android:id="@+id/button3"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="重新加载" />

        <Button

            android:id="@+id/button4"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="释放资源" />

    </LinearLayout>

    <include layout="@layout/my_runnable_merge"/>

</LinearLayout>

方式一、方式二的全局配置文件AndroidManifest.xml文件的配置如下:

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<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.xxxx.threadpooltest"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="15" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="Main"

            android:label="@string/app_name" >

<!--             <intent-filter> -->

<!--                 <action android:name="android.intent.action.MAIN" /> -->

<!--                 <category android:name="android.intent.category.LAUNCHER" /> -->

<!--             </intent-filter> -->

        </activity>

        <activity

            android:name="MyRunnableActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

源码:http://mzh3344258.blog.51cto.com/1823534/1313611 里面的附件,WordPress里面不知道怎么上传,大家多见谅吧.

这些代码中写的都是一些比较简单的写法, 仅仅是使用了在线程中休眠的方式来模拟网络下载(还是个假象),如果在实际代码中使用时,尤其在释放资源这一块,不要只是单单释放了我们自己控制的线程池及其任务,还要将网络请求的Http也一同销毁(disconnection)掉哦,这样才算做到了完美!

如果还有哪位朋友没有安卓源码的话,可以到这个地址查看官方在线的安卓系统源码:https://github.com/android  

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转载自blog.csdn.net/lalate/article/details/83902218