Android Combat Simple Tutorial-the 68th gun (Android gadget appwidget time display)

Android Appwidget development differs from normal Android apps because Appwidget is a program that runs in other processes. It uses Remoteviews to update the UI. Once the system has changed, it is easy to cause appwidget update. It has a limited number of supported components and very few event types. Therefore, it is generally used for the components of the desktop display, which have a long update period and relatively simple events. Its development process is relatively simple. Broadly divided into:

1: Writing the layout file

<?xml version= "1.0" encoding= "Utf-8"? ><textview xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:id=" @+id/textview01 "    android:layout_width=" fill_parent "    android:layout_height=" Fill_parent "    android:gravity=" center "    android:text=" Starting ... "    android:textcolor=" #FFFF00 "    Android:textsize= "14dip"/>

2: Writing provider configuration files and manifest configuration files

<manifest xmlns:android= "http://schemas.android.com/apk/res/android"    package= "Com.mywidget"    android: Versioncode= "1"    android:versionname= "1.0" >    <uses-sdk        android:minsdkversion= "8"        android: targetsdkversion= "/>    <application        android:icon=" @drawable/ic_launcher "android:label="        @ String/app_name "        android:theme=" @style/apptheme ">        <receiver android:name=" MyTime "android:label=" MyTime ">            <intent-filter>                <action android:name=" Android.appwidget.action.APPWIDGET_UPDATE " />            </intent-filter>            <meta-data android:name= "Android.appwidget.provider" android:resource= "@xml/my_time"/>        </receiver>         <service android:name= "Mytime$myservice"/>    </ Application></manifest>

3: Writing business logic

Package Com.mywidget;import Java.util.date;import Java.util.timer;import java.util.timertask;import Android.os.handler;import Android.os.ibinder;import Android.os.message;import Android.app.Service;import Android.appwidget.appwidgetmanager;import Android.appwidget.appwidgetprovider;import Android.content.componentname;import Android.content.context;import Android.content.intent;import Android.widget.remoteviews;public class MyTime extends Appwidgetprovider {timer timer; Context context;//Onupdate@overridepublic void onUpdate (context con, Appwidgetmanager appwidgetmanager,int[] Appwidgetids) {context = Con;timer = new timer (); Timer.schedule (timertask, 0, 1000);//1 seconds call}//MyService Service Program Public Static class MyService extends Service {@Overridepublic void OnStart (Intent Intent, int startid) {remoteviews remoteviews = New Remoteviews (Getpackagename (), r.layout.my_time);//Set Display control Remoteviews.settextviewtext (r.id.textview01,new Date (). toLocaleString ()); ComponentName thiswidget = new ComponentnamE (this, mytime.class); Appwidgetmanager Manager = Appwidgetmanager.getinstance (this); Manager.updateappwidget (Thiswidget, remoteViews);} @Overridepublic ibinder onbind (Intent Intent) {return null;}};/ /handlerprivate Handler Handler = new Handler () {public void Handlemessage (Message msg) {Intent Intent = new Intent (conte XT, Myservice.class); Context.startservice (intent);}}; Private TimerTask TimerTask = new TimerTask () {public void run () {Message message = new Message (); Handler.sendmessage (mess age);}};}

Run the following example:

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Android Combat Simple Tutorial-the 68th gun (Android gadget appwidget time display)