Android advanced tutorial (8)-android widget development case (countdown to the World Cup !)

Today, let's write about the development of Android Widgets. As soon as we get up early in the morning, I will not talk about the specifics. Let's just imitate them! First, let's take a look:

 

 

The detailed steps of the demo are as follows:

 

1. Create an android project named widgetdemo.

 

2. Prepare materials. One is the widget icon and the other is the background of the widget. Storage directory:

 

 

3. Modify the string. xml file as follows:

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <resources> <br/> <string name = "hello"> Hello world, widetdemo! </String> <br/> <string name = "app_name"> daystoworldcup </string> <br/> </resources> <br/>

 

4. Create a widget content provider file. Create an XML folder under Res and create a new widget_provider.xml code:

 

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <appwidget-provider xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: minwidth = "50dip" <br/> Android: minheight = "50dip" <br/> Android: updateperiodmillis = "10000" <br/> Android: initiallayout = "@ layout/main" <br/>

 

5. Modify the main. xml layout. The Code is as follows:

 

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: Orientation = "vertical" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> Android: background = "@ drawable/wordcup" <br/> <textview <br/> Android: Id = "@ + ID/wordcup" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "wrap_content" <br/> Android: text = "@ string/Hello" <br/> Android: textsize = "12px" <br/> Android: textcolor = "# ff0000" <br/> </linearlayout> <br/>

 

6. modify the code of widgetdemo. Java as follows:

Package COM. android. tutor; <br/> Import Java. util. calendar; <br/> Import Java. util. date; <br/> Import Java. util. gregoriancalendar; <br/> Import Java. util. timer; <br/> Import Java. util. timertask; <br/> Import android. appwidget. appwidgetmanager; <br/> Import android. appwidget. appwidgetprovider; <br/> Import android. content. componentname; <br/> Import android. content. context; <br/> Import android. widget. remoteviews; <br/> public class widetdemo extends appwidgetprovider {<br/>/** called when the activity is first created. */</P> <p> @ override <br/> Public void onupdate (context, appwidgetmanager, <br/> int [] appwidgetids) {</P> <p> timer = new timer (); <br/> timer. scheduleatfixedrate (New mytime (context, appwidgetmanager), 1, 60000); <br/> super. onupdate (context, appwidgetmanager, appwidgetids); <br/>}</P> <p> private class mytime extends timertask {<br/> remoteviews; <br/> appwidgetmanager; <br/> componentname thiswidget; </P> <p> Public mytime (context, appwidgetmanager) {<br/> This. appwidgetmanager = appwidgetmanager; <br/> remoteviews = new remoteviews (context. getpackagename (), R. layout. main); </P> <p> thiswidget = new componentname (context, widetdemo. class); <br/>}< br/> Public void run () {</P> <p> date = new date (); <br/> calendar = new gregoriancalendar (2010,06, 11); <br/> long days = (calendar. gettimeinmillis ()-date. gettime ()/1000)/86400; <br/> remoteviews. settextviewtext (R. id. wordcup, "+ days +" days "); <br/> appwidgetmanager. updateappwidget (thiswidget, remoteviews); </P> <p >}</P> <p>}

 

7. modify the configuration file androidmanifest. xml. The Code is as follows:

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <manifest xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> package = "com. android. tutor "<br/> Android: versioncode =" 1 "<br/> Android: versionname =" 1.0 "> <br/> <application Android: icon = "@ drawable/icon" Android: Label = "@ string/app_name"> <br/> <Cycler Android: Name = ". widetdemo "<br/> Android: Label =" @ string/app_name "> <br/> <intent-filter> <br/> <action Android: Name =" android. appwidget. action. appwidget_update "/> <br/> </intent-filter> <br/> <meta-data Android: Name =" android. appwidget. provider "<br/> Android: resource = "@ XML/widget_provider" <br/> </javaser> <br/> </Application> <br/> <uses-SDK Android: minsdkversion = "7"/> <br/> </manifest>

 

8. Click "run" (CTRL + F11). After the operation is successful, we click "desktop" for a long time. The following two items are displayed. Click them one by one to see the top:

 

 

Today I am here. I am sleepy. I found that the time seems to be wrong, lol ~ I don't think much about it either. Let me know what you know! I don't know much about calendar. Thank you !!