Three ways to use timers in Android _android

The example of this article for everyone to share the use of the timer in Android three ways, for your reference, the specific content as follows

Icon:

Because it is relatively simple, so just paste the code (take care to click the stop operation again), there is a global handler responsible for receiving the message update UI

The first method: Thread.Sleep (); Method

Runnable Runnable = new Runnable () {
    @Override public
  void Run () {while
   (true)
   { Mhandler.sendemptymessage (0);
 try {
   thread.sleep (1000);
  } catch (Interruptedexception e) {
    e.printstacktrace ();
     }
    }}
   };
New Thread (runnable). Start ();

The second method: Postdelay () method of Handler

Final Runnable Runnable = new Runnable () {
      @Override public
      void Run () {
        if (isStart2) {
          mhandler.sendemp Tymessage (0);
          Mhandler.postdelayed (this, 1000);
        }
      }
    ;
Mhandler.postdelayed (runnable, 1000);
    }

The third type: Timer and TimerTask

 Private Timer timer = new timer ();
  Private TimerTask TimerTask = new TimerTask () {
    @Override public
    void Run () {
      mhandler.sendemptymessage ( 0);
    }
  ;
 Timer.schedule (TimerTask, 1000, 1000);

In general, the third method is most convenient, not easy to make mistakes, the second is easy to forget to add the starting event.

Paste the complete code:

Layout file

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android= "http://schemas.android.com/apk/res/" Android "xmlns:tools=" Http://schemas.android.com/tools "android:layout_width=" Match_parent "android:layout_height = "Match_parent" android:paddingbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_ Horizontal_margin "android:paddingright=" @dimen/activity_horizontal_margin "android:paddingtop=" @dimen/activity_
    Vertical_margin "tools:context=" com.brioal.timertest.MainActivity "> <textview android:id=" @+id/main_tv "
    Android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_centerhorizontal= "true" android:layout_margintop= "100DP" android:text= "Hello world!"/> <linearlayout android:layout_width= "Ma Tch_parent "android:layout_height=" wrap_content "android:layout_below=" @id/main_tv "android:layout_margintop=" 100DP "android:gravity=" center "android:orientation= "vertical" > <button android:layout_width= "wrap_content" android:layout_height= "Wrap_cont" ENT "android:layout_gravity=" center "android:layout_margin=" 5DP "android:onclick=" Method1 "Android
      : text= "Method 1:thread" android:textallcaps= "false"/> <button android:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_gravity= "center" android:layout_margin= "5DP" Androi d:onclick= "Method2" android:text= "method 2:handler" android:textallcaps= "false"/> <button Android : layout_width= "wrap_content" android:layout_height= "wrap_content" android:layout_gravity= "center" Androi D:layout_margin= "5DP" android:onclick= "Method3" android:text= "method 3:task" android:textallcaps= "false"/&gt
  ;

 </LinearLayout> </RelativeLayout>

mainactivity

Package com.brioal.timertest;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.os.Message;
Import android.support.v7.app.AppCompatActivity;
Import Android.view.View;

Import Android.widget.TextView;
Import Java.text.SimpleDateFormat;
Import Java.util.Timer;

Import Java.util.TimerTask;
  public class Mainactivity extends Appcompatactivity {private TextView mTv; Private Handler Mhandler = new Handler () {@Override public void Handlemessage (msg) {Super.handleme
      Ssage (msg);
      Displays the current time after receiving the message long = System.currenttimemillis ();
      SimpleDateFormat DateFormat = new SimpleDateFormat ("HH:mm:ss");
      String time = Dateformat.format (current);
    Mtv.settext (time);
  }
  };
  Private Timer timer = new timer ();
    Private TimerTask TimerTask = new TimerTask () {@Override public void run () {mhandler.sendemptymessage (0);
  }
  };
  Private Thread Thread1;
  Private Boolean isStart1 = false; Private Boolean IsSTart2 = false;


  Private Boolean isStart3 = false;
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.activity_main);
  MTv = (TextView) Findviewbyid (R.ID.MAIN_TV); //thread method public void Method1 (view view) {Runnable Runnable = new Runnable () {@Override public V
          OID Run () {while (IsStart1) {mhandler.sendemptymessage (0);

          try {thread.sleep (1000);
          catch (Interruptedexception e) {e.printstacktrace ();
    }
        }

      }
    };
    if (isStart1) {isStart1 = false;
      else {IsStart1 = true;
      Thread1 = new Thread (runnable);
    Thread1.start (); } public void Method2 (view view) {final Runnable Runnable = new Runnable () {@Override public voi
          D Run () {if (IsStart2) {mhandler.sendemptymessage (0); Mhandler.postdelayed (This, 1000);
    }
      }
    };
    if (isStart2) {isStart2 = false;
      else {mhandler.postdelayed (runnable, 1000);
    IsStart2 = true;
      } public void Method3 (view view) {if (ISSTART3) {timer.cancel ();
    IsStart3 = false;
      else {timer.schedule (timertask, 1000, 1000);
    IsStart3 = true;
 }
  }
}

Finished, complete GitHub address: timertest

The above is the timer to use the entire content of the method, I hope to give you a reference, but also hope that we support the cloud habitat community.