Android实现计时与倒计时的方法汇总

方法一

timer与timertask（java实现）

public class timertask extends activity{ 
 private int reclen = 11; 
 private textview txtview; 
 timer timer = new timer(); 
 public void oncreate(bundle savedinstancestate){ 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.timertask); 
  txtview = (textview)findviewbyid(r.id.txttime); 
  timer.schedule(task, 1000, 1000);  // timetask 
 }  
 timertask task = new timertask() { 
  @override 
  public void run() { 
   runonuithread(new runnable() {  // ui thread 
    @override 
    public void run() { 
     reclen--; 
     txtview.settext(""+reclen); 
     if(reclen < 0){ 
      timer.cancel(); 
      txtview.setvisibility(view.gone); 
     } 
    } 
   }); 
  } 
 }; 
} 

方法二

timertask与handler（不用timer的改进型）

public class timertask extends activity{ 
 private int reclen = 11; 
 private textview txtview; 
 timer timer = new timer(); 
 public void oncreate(bundle savedinstancestate){ 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.timertask); 
  txtview = (textview)findviewbyid(r.id.txttime); 
  timer.schedule(task, 1000, 1000);  // timetask 
 }  
 final handler handler = new handler(){ 
  @override 
  public void handlemessage(message msg){ 
   switch (msg.what) { 
   case 1: 
    txtview.settext(""+reclen); 
    if(reclen < 0){ 
     timer.cancel(); 
     txtview.setvisibility(view.gone); 
    } 
   } 
  } 
 }; 
 timertask task = new timertask() { 
  @override 
  public void run() { 
   reclen--; 
   message message = new message(); 
   message.what = 1; 
   handler.sendmessage(message); 
  } 
 }; 
} 

方法三

handler与message（不用timertask） 

public class timertask extends activity{ 
 private int reclen = 11; 
 private textview txtview; 
 public void oncreate(bundle savedinstancestate) {  
  super.oncreate(savedinstancestate);  
  setcontentview(r.layout.timertask);  
  txtview = (textview)findviewbyid(r.id.txttime); 
  message message = handler.obtainmessage(1);  // message 
  handler.sendmessagedelayed(message, 1000); 
 }  
 final handler handler = new handler(){ 
  public void handlemessage(message msg){   // handle message 
   switch (msg.what) { 
   case 1: 
    reclen--; 
    txtview.settext("" + reclen); 
    if(reclen > 0){ 
     message message = handler.obtainmessage(1); 
     handler.sendmessagedelayed(message, 1000);  // send message 
    }else{ 
     txtview.setvisibility(view.gone); 
    } 
   } 
   super.handlemessage(msg); 
  } 
 }; 
} 

方法四

handler与thread（不占用ui线程）

public class timertask extends activity{ 
 private int reclen = 0; 
 private textview txtview; 
 public void oncreate(bundle savedinstancestate){ 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.timertask); 
  txtview = (textview)findviewbyid(r.id.txttime); 
  new thread(new mythread()).start();   // start thread 
 }  
 final handler handler = new handler(){   // handle 
  public void handlemessage(message msg){ 
   switch (msg.what) { 
   case 1: 
    reclen++; 
    txtview.settext("" + reclen); 
   } 
   super.handlemessage(msg); 
  } 
 }; 
 public class mythread implements runnable{  // thread 
  @override 
  public void run(){ 
   while(true){ 
    try{ 
     thread.sleep(1000);  // sleep 1000ms 
     message message = new message(); 
     message.what = 1; 
     handler.sendmessage(message); 
    }catch (exception e) { 
    } 

方法五

handler与runnable（最简单型）   

public class timertask extends activity{ 
 private int reclen = 0; 
 private textview txtview; 
 public void oncreate(bundle savedinstancestate){ 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.timertask); 
  txtview = (textview)findviewbyid(r.id.txttime); 
  handler.postdelayed(runnable, 1000); 
 }  
 handler handler = new handler(); 
 runnable runnable = new runnable() { 
  @override 
  public void run() { 
   reclen++; 
   txtview.settext("" + reclen); 
   handler.postdelayed(this, 1000); 
  } 
 }; 
} 

计时与倒计时

方法1，方法2和方法3，都是倒计时

方法4，方法5，都是计时

计时和倒计时，都可使用上述方法实现（代码稍加改动）

ui线程比较

方法1，方法2和方法3，都是在ui线程实现的计时；

方法4和方法5，是另开runnable线程实现计时

实现方式比较

方法1，采用的是java实现，即timer和timertask方式；

其它四种方法，都采用了handler消息处理

推荐使用

如果对ui线程交互要求不很高，可以选择方法2和方法3

如果考虑到ui线程阻塞，严重影响到用户体验，推荐使用方法4，另起线程单独用于计时和其它的逻辑处理

方法5，综合了前几种方法的优点，是最简的

以上所述是小编给大家介绍的android实现计时与倒计时的方法汇总值，希望对大家有所帮助