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网站的支持！

来源：http://blog.csdn.net/fengyenom1/article/details/72870572