android实现计时与倒计时 Android实现计时与倒计时的方法汇总

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android实现计时与倒计时 Android实现计时与倒计时的方法汇总

fengyeNom1   2021-03-24 我要评论
想了解Android实现计时与倒计时的方法汇总的相关内容吗,fengyeNom1在本文为您仔细讲解android实现计时与倒计时的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:android,实现计时,android,倒计时,下面大家一起来学习吧。

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,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

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