Android three ways to implement timers _android

Method one, using handler and thread (thread) to implement the timer

Copy Code code as follows:

Package Com.xunfang.handerDemo;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.os.Message;
Import Android.widget.TextView;
public class Handerdemoactivity extends activity {
TextView tvshow;
private int i = 0;
@Override
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.main);
Tvshow = (TextView) Findviewbyid (r.id.tv_show);
New Thread (New Threadshow ()). Start ();
}
Handler class receives data
Handler Handler = new Handler () {
public void Handlemessage (msg) {
if (msg.what = = 1) {
Tvshow.settext (integer.tostring (i++));
SYSTEM.OUT.PRINTLN ("Receive ...");
}
};
};
Thread class
Class Threadshow implements Runnable {
@Override
public void Run () {
while (true) {
try {
Thread.Sleep (1000);
msg = new Message ();
Msg.what = 1;
Handler.sendmessage (msg);
SYSTEM.OUT.PRINTLN ("Send ...");
catch (Exception e) {
E.printstacktrace ();
SYSTEM.OUT.PRINTLN ("Thread error ...");
}
}
}
}
}

Method Two, use the handler class to carry postdelyed to implement the timer

Copy Code code as follows:

Package Com.xunfang.handerDemo;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.widget.TextView;
public class Handerdemoactivity extends activity {
TextView tvshow;
private int i = 0;
private int time = 1000;
@Override
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.main);
Tvshow = (TextView) Findviewbyid (r.id.tv_show);
Handler.postdelayed (runnable, time); every 1s execution
}
Handler Handler = new Handler ();
Runnable Runnable = new Runnable () {
@Override
public void Run () {
Realization of timer by handler self-band method
try {
Handler.postdelayed (this, time);
Tvshow.settext (integer.tostring (i++));
System.out.println ("do ...");
catch (Exception e) {
TODO auto-generated Catch block
E.printstacktrace ();
SYSTEM.OUT.PRINTLN ("Exception ...");
}
}
};
}

Method Three, use handler, timer and TimerTask three Android class implementation timer

Copy Code code as follows:

Package Com.xunfang.handerDemo;
Import Java.util.Timer;
Import Java.util.TimerTask;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.os.Message;
Import Android.widget.TextView;
public class Handerdemoactivity extends activity {
TextView tvshow;
private int i = 0;
private int time = 1000;
@Override
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.main);
Tvshow = (TextView) Findviewbyid (r.id.tv_show);
Timer.schedule (Task, 1000, 1000); Execute task after 1s, execute again after 1s
}
Handler Handler = new Handler () {
public void Handlemessage (msg) {
if (msg.what = = 1) {
Tvshow.settext (integer.tostring (i++));
}
Super.handlemessage (msg);
};
};
Timer timer = new timer ();
TimerTask task = new TimerTask () {
@Override
public void Run () {
Send a message
Message message = new Message ();
Message.what = 1;
Handler.sendmessage (message);
}
};
}