service类

1. public class WidgetService extends Service
2. {
4. @Override
5. public IBinderonBind(Intentintent)
6. {
7. return null ;
8. }
10. @Override
11. public void onStart(Intentintent, int startId)
12. {
13. super .onStart(intent,startId);
14. RemoteViewsrv=new RemoteViews( this .getPackageName(),R.layout.app);
15. rv.setTextViewText(R.id.av1,new Date().toLocaleString());
16. ComponentNamecn=new ComponentName( this ,DeskMain. class );
17. AppWidgetManageram=AppWidgetManager.getInstance(this );
18. am.updateAppWidget(cn,rv);
19. }
20. }

AppWidgetProvider类

1. public class DeskMain extends AppWidgetProvider
2. {
4. @Override
5. public void onUpdate(Contextcontext,AppWidgetManagerappWidgetManager,
6. int []appWidgetIds)
7. {
8. Log.i("syso" , "update3..................." );
9. Intentintent=new Intent(context,WidgetService. class );
10. PendingIntentrefreshIntent=PendingIntent.getService(context,0 ,intent, 0 );
11. AlarmManageralarm=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
12. alarm.setRepeating(AlarmManager.RTC,0 , 1000 ,refreshIntent);
13. context.startService(intent);
14. }
16. @Override
17. public void onReceive(Contextcontext,Intentintent)
18. {
19. Log.i("syso" , "receive..................." );
20. super .onReceive(context,intent);
21. }
    

AndroidManifest.xml

1. <? xml version = "1.0" encoding = "utf-8" ?>
2. < manifest xmlns:android = "http://schemas.android.com/apk/res/android"
3. package = "com.app"
4. android:versionCode = "1"
5. android:versionName = "1.0" >
6. < uses-permission android:name = "android.permission.ACCESS_FINE_LOCATION" > </ uses-permission >
9. < application android:icon = "@drawable/icon" android:label = "@string/app_name" android:screenOrientation = "portrait" android:permission = "android.permission.ACCESS_FINE_LOCATION" >
10. < activity android:name = ".Main"
11. android:label = "@string/app_name" >
12. <!---->
13. < receiver
14. android:label = "@string/app_name"
15. android:name = ".DeskMain" >
16. < intent-filter >
17. < action android:name = "android.appwidget.action.APPWIDGET_UPDATE" />
18. </ intent-filter >
19. < meta-data android:name = "android.appwidget.provider"
20. android:resource = "@xml/my_widget_provider" >
21. </ meta-data >
22. </ receiver >
23. < service android:name = "WidgetService" />
25. </ application >
26. < uses-sdk android:minSdkVersion = "7" />
28. </ manifest >
    

我们在做widget开发时，要解决的主要问题是怎么做到实时刷新，比如当我们在一个activity里点击插入或删除操作时，能够使widget上显示的数据条数刷新
下面是在activity里要实现的代码:

1. Intentintent= new Intent( "com.android.CLICK" );
2. ResultActivity.this .sendBroadcast(intent);
   

我们还要在AndroidMainifest.xml的<intent-filter>里定制:

1. <actionandroid:name= "com.android.CLICK" ></action>
   

在widget类里我们用onReceive方法:

1. //把数据显示上widget
2. RemoteViewsviews=new RemoteViews(context.getPackageName(),R.layout.main);
3. StringstrLine=System.getProperty("line.separator" );
4. views.setTextViewText(R.id.note_text,“要显示的信息”);
6. //添加响应事件
7. intent=new Intent(context,OperateActivity. class );
10. PendingIntentPintent=PendingIntent.getActivity(context,0 ,intent, 0 );
11. views.setOnClickPendingIntent(R.id.widget,Pintent);
13. //最后更新
14. AppWidgetManagerappWidgetManager=AppWidgetManager.getInstance(context);
15. appWidgetManager.updateAppWidget(new ComponentName(context,Note. class ),views);
    

更多相关文章

1. mybatisplus的坑 insert标签insert into select无参数问题的解决
2. python起点网月票榜字体反爬案例
3. 《Android开发从零开始》——25.数据存储(4)
4. Android系统配置数据库注释(settings.db)
5. Android中不同应用间实现SharedPreferences数据共享
6. Android(安卓)P SystemUI之StatusBar UI布局status_bar.xml解析
7. android图表ichartjs
8. android用户界面-组件Widget-地图视图MapView
9. Android内容提供者源码

随机推荐

1. android 解决输入法键盘遮盖布局问题
2. android学习笔记（2）---第一个Android应用程
3. android 在配置文件中指定上级activity
4. Android调用WebService系列之KSoap2对象
5. Android缺乏整体控制或成发展障碍
6. 如何在eclipse的android工程里引用androi
7. 一张图带你掌握Android Q上InputDispatch
8. java和Android都是新手，想学Android，怎样入
9. Android(安卓)Studio中Run按钮app的modul
10. Android(安卓)使用Activity用作弹出式Dia