Two Methods for refreshing the UI

Two Methods for refreshing the UI

Http://hi.baidu.com/fighter0425/blog/item/acb24612528406c3ac6e7558.html

Recently, I have been considering how to implement real-time temperature measurement and alarm alerts on the Android platform of 6410. Last year I started to learn about Android development, but I still don't know how to refresh the interface, update the collected data continuously. I checked it online today and spent two hours researching it. Haha, I finally figured out what to do. Generally, there are two methods: timer and Message notification, and multi-thread mechanism to actively refresh the interface. Of course, both of these methods are inseparable from the powerful handler in Android. Using this method for UI thread update is indeed a rare choice. Handler won't talk much about it here. There are a lot of online materials that can be viewed at any time.

Method 1:

Package du. helloword;

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. util. log;
Import Android. View. view;
Import Android. View. View. onclicklistener;
Import Android. widget. Button;
Import Android. widget. textview;

Public class helloactivity extends activity {
/** Called when the activity is first created .*/
Private Final int update_data = 1;
Private textview mydata;
Private timer mtimer;
Private timertask mtimertask;
Private handler mhandler;
Private int I = 0;
/** Called when the activity is first created .*/
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
Mydata = (textview) findviewbyid (R. Id. mydata );
Button button1 = (button) findviewbyid (R. Id. Start );
// Button1.setonclicklistener (start );
Mhandler = new handler (){
@ Override
Public void handlemessage (Message MSG ){

Super. handlemessage (MSG );
Switch (msg. What ){
Case update_data:
I = I + 1;
If (I = 100)
I = 1;
// Mydata. settext ("");
Log. D ("update -- Data", "this is the" + I + "times to print this information ");
Mydata. settext ("this is the" + I + "");
Break;

Default:
Break;
}

}

};
Mtimer = new timer ();
Mtimertask = new timertask () {// timer scheduled processing function
@ Override
Public void run (){
// Todo auto-generated method stub
Mhandler. sendemptymessage (update_data );
}

};
Mtimer. Schedule (mtimertask, 1000,300 0 );
}

}

The following is the simulated AVD

Method 2:

Package du. activity;

Import Android. App. activity;
Import Android. OS. Bundle;
Import Android. OS. Handler;
Import Android. widget. textview;

Public class activity01 extends activity {
Private textview mydata;
Private int I;
Private handler = new handler ();
Private runnable = new runnable (){
Public void run (){
This. Update ();
Handler. postdelayed (this, 1000*2); // interval of 2 seconds
}
Void Update (){
I = I + 1;
If (I = 100)
I = 1;
Mydata. settext ("this is the" + I + "");
}
};
/** Called when the activity is first created .*/
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
Mydata = (textview) findviewbyid (R. Id. mydata );
Mydata. settext ("initial state ");
Handler. postdelayed (runnable, 1000*2 );
}
@ Override
Protected void ondestroy (){
Handler. removecallbacks (runnable); // stop refreshing
Super. ondestroy ();
}
}

The following are:

Running Effect published on mobile phones