Android message mechanism (i)

Message Manipulation Class Handler

First write the Main.xml file code as follows:

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:orientation=" vertical "    android:layout_width=" Fill_parent    " android:layout_height= "Fill_parent" ><textview     android:id= "@+id/info" android:layout_width= "Fill_    Parent    

Then rewrite the Activity.java class

The code is as follows:

Package Com.example.myfirstproject;import Java.util.arraylist;import Java.util.list;import java.util.Timer;import Java.util.timertask;import Android.os.bundle;import Android.os.handler;import Android.os.Message;import Android.app.activity;import Android.content.pm.activityinfo;import Android.content.res.configuration;import Android.view.menu;import Android.view.view;import Android.view.view.onclicklistener;import Android.view.ViewGroup Import android.widget.*;p ublic class Mainactivity extends Activity {private static int count = 0;public static final int SET = 1;private Handler MyHandler = new Handler () {public void Handlemessage (android.os.Message msg) {switch (msg.what) { Case SET:MainActivity.this.info.setText ("mldn-" +count++);}};    Private TextView info = null;        public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        This.info = (TextView) Super.findviewbyid (r.id.info); Timer timer = new TimER ();    Timer.schedule (New MyTask (), 0, 1000);    } private class MyTask extends timertask{public void run () {message msg = new Message ();    Msg.what = SET;    MainActivity.this.myHandler.sendMessage (msg); }    }}

Operating effect:

Android message mechanism (i)