java– 用于计时器的Android线程

概述publicclassMainActivityextendsActivity{intmin,sec;/**Calledwhentheactivityisfirstcreated.*/@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);min

public class MainActivity extends Activity{int min, sec;/** Called when the activity is first created. */@OverrIDepublic voID onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentVIEw(R.layout.main);     min = 5;    sec = 0;    final TextVIEw timer1 = (TextVIEw) findVIEwByID(R.ID.timer1);    timer1.setText(min + ":" + sec);    Thread t = new Thread() {        public voID run() {                sec-=1;                if (sec<0) {                    min-=1;                    sec=59;                }                timer1.setText(min + ":" + sec);                try                {                    sleep(1000);                }                catch (InterruptedException e)                {}            }    };    t.start();}}

这是Java中的线程的代码,但它不起作用.你能帮助我吗？

它的计时器从5分钟到0点倒计时.

解决方法:

在您的情况下,您正在使用线程.所以你不能从ui线程以外的线程更新ui.所以你使用runOnUithread.我建议你使用倒数计时器或处理程序.

1.CountDownTimer

http://developer.android.com/reference/android/os/CountDownTimer.html

这是另一个例子的链接.建议您查看倒计时器的链接.

Countdowntimer in minutes and seconds

例：

 public class MainActivity extends Activity {button b; TextVIEw tv;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    tv = (TextVIEw) findVIEwByID(R.ID.textVIEw1);    b= (button) findVIEwByID(R.ID.button1);    b.setonClickListener(new OnClickListener()    {        @OverrIDe        public voID onClick(VIEw v) {            // Todo auto-generated method stub            startTimer(200000);         }    });}private voID startTimer(long time){    CountDownTimer counter = new CountDownTimer(30000, 1000){        public voID onTick(long millisUntilDone){           Log.d("counter_label", "Counter text should be changed");          tv.setText("You have " + millisUntilDone + "ms");                            }        public voID onFinish() {            tv.setText("DONE!");        }    }.start();} }

你可以使用Handler

示例：

Handler m_handler;Runnable m_handlerTask ; int timeleft=100;m_handler = new Handler(); m_handlerTask = new Runnable() { @OverrIDepublic voID run() {if(timeleft>=0){       // do stuff     Log.i("timeleft",""+timeleft);     timeleft--; }      else{  m_handler.removeCallbacks(m_handlerTask); // cancel run}   m_handler.postDelayed(m_handlerTask, 1000);  } }; m_handlerTask.run();     

3.每

Timer在不同的线程上运行.你应该在ui线程上更新ui.使用runOnUiThread

示例：

  int timeleft=100;  Timer _t = new Timer();    _t.scheduleAtFixedrate( new TimerTask() {            @OverrIDe            public voID run() {               runOnUiThread(new Runnable() //run on ui thread                 {                  public voID run()                   {                     Log.i("timeleft",""+timeleft);                      //update ui                  }                 });                 if(timeleft>==0)                 {                  timeleft--;                  }                  else                 {                 _t.cancel();                 }            }        }, 1000, 1000 ); 

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