java定时器封装类

定时器使我们写程序不可或缺的一个模块，通常一个程序不仅仅使用一个定时器，那我们创建多个定时器不仅仅影响美观，而且不方便，做很多无用功。所以本人在写程序前肯定提前导入封装好的定时器类，以便随时调用。

下面贴上代码：

package com.util.timer;public final class BasicTimer {//对外接口    static private BasicTimerManager mManager = BasicTimerManager.getInstance();    public interface BasicTimerCallback{        void onTimer();    }    //注意：不可使用对象调用startOneshot()    public static void startOneshot(int millisec, BasicTimerCallback cb){        mManager.startOneshot(new BasicTimer(cb), millisec);    }    public BasicTimer(BasicTimerCallback cb){        mManager.addTimer(this, cb);    }    public void start(int millisec){        mManager.start(this, millisec);    }    public void stop(){        mManager.stop(this);    }    //调用cancel()后，定时器将不再可用    public void cancel(){        mManager.remove(this);    }    public boolean isRunning(){        return mManager.isRunning(this);    };}

结构体：

package com.util.timer;final class BasicTimerInfo {    int init;           //初始计数值    int count;          //间隔计数，即基于基础定时的倍率    boolean oneshot;    //是否为单次定时    Object cb;          //定时回调}

实现类：

package com.util.timer;import android.os.Handler;import android.os.Message;import java.util.*;import java.util.concurrent.ConcurrentHashMap;final class BasicTimerManager {    private static BasicTimerManager sInstance;    private Map<BasicTimer, BasicTimerInfo> mInfos = new ConcurrentHashMap<>();//必须使用并发类    private Timer mTimer = new Timer();    private static final int BASE_INTERAL_MILLISEC = 100;    private BasicTimerManager(){        mTimer.schedule(new TimerTask() {            @Override            public void run() {                doRun();            }        }, 0, BASE_INTERAL_MILLISEC);    }    public static BasicTimerManager getInstance(){        if (sInstance == null){            sInstance = new BasicTimerManager();        }        return sInstance;    }    public void addTimer(BasicTimer timer, BasicTimer.BasicTimerCallback cb){        BasicTimerInfo info = new BasicTimerInfo();        info.cb = cb;        info.init = Integer.MAX_VALUE;        info.count = Integer.MAX_VALUE;        mInfos.put(timer, info);    }    public void start(BasicTimer timer, int millisec){        startTimer(timer, millisec, false);    }    public void startOneshot(BasicTimer timer, int millisec){        startTimer(timer, millisec, true);    }    public void stop(BasicTimer timer){        if (mInfos.containsKey(timer)){            BasicTimerInfo info = mInfos.get(timer);            info.init = Integer.MAX_VALUE;            info.count = Integer.MAX_VALUE;        }    }    public void remove(BasicTimer timer){        if (mInfos.containsKey(timer)){            mInfos.remove(timer);        }    }    public boolean isRunning(BasicTimer timer){        boolean running = false;        if (mInfos.containsKey(timer)){            BasicTimerInfo info = mInfos.get(timer);            running = !(info.init == Integer.MAX_VALUE && info.count == Integer.MAX_VALUE);        }        return running;    }    private void startTimer(BasicTimer timer, int millisec, boolean oneshot){        if (mInfos.containsKey(timer)){            BasicTimerInfo info = mInfos.get(timer);            info.count = millisec / BASE_INTERAL_MILLISEC;            info.init = millisec / BASE_INTERAL_MILLISEC;            info.oneshot = oneshot;            //保证不能为0            info.count = Math.max(info.count, 1);            info.count = Math.max(info.init, 1);        }    }    private void doRun(){        List<Object> ls = new ArrayList<>();        for (Map.Entry entry: mInfos.entrySet()){            BasicTimerInfo info = (BasicTimerInfo)entry.getValue();            if(--info.count == 0) {                if (info.oneshot){                    info.count = Integer.MAX_VALUE;                    info.init = Integer.MAX_VALUE;                }else {                    info.count = info.init;                }                //先保存所有到时的定时器，统一发送到主线程处理                ls.add(entry);            }        }        if (!ls.isEmpty()){            Message message = new Message();            message.what = 0;            message.obj = ls;            mHander.sendMessage(message);        }    }    private Handler mHander = new Handler(new Handler.Callback() {        @Override        public boolean handleMessage(Message msg) {            List<Object> ls = (List<Object>) msg.obj;            for (Object o: ls){                Map.Entry entry = (Map.Entry)o;                BasicTimer timer = (BasicTimer)entry.getKey();                BasicTimerInfo info = (BasicTimerInfo)entry.getValue();                ((BasicTimer.BasicTimerCallback)info.cb).onTimer();                if (info.oneshot){ //单次定时到时后，删除定时器对象                    remove(timer);                }            }            return false;        }    });}

应用方法：

单次定时器：

BasicTimer.startOneshot(1500, new BasicTimer.BasicTimerCallback() {            @Override            public void onTimer() {                shipLocation();            }        });

循环定时器：

BasicTimer vesselBasicTimer = new BasicTimer(new BasicTimer.BasicTimerCallback() {            @Override            public void onTimer() {                //干你想干的事            }        });        vesselBasicTimer.start(5000);

源码下载地址：http://download.csdn.net/detail/m0_38082472/9876450

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