Android桌面组件App Widget完整案例
本文实例讲述了Android桌面组件AppWidget用法。分享给大家供大家参考。具体如下:
这里模拟一个案例:把AppWidget添加到桌面后,点击AppWidget后AppWidget文本会轮回改变
main.xml布局文件:
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical"android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextViewandroid:id="@+id/tv" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="程序入口" android:textSize="50dip"/> </LinearLayout>
res/xml/my_appwidget.xml布局文件:
<?xmlversion="1.0"encoding="utf-8"?> <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="120dp" android:minHeight="60dp" android:updatePeriodMillis="1000" android:initialLayout="@layout/main"> </appwidget-provider>
清单文件:
<?xmlversion="1.0"encoding="utf-8"?> <manifestxmlns:android="http://schemas.android.com/apk/res/android" package="com.ljq.activity"android:versionCode="1" android:versionName="1.0"> <applicationandroid:icon="@drawable/icon" android:label="@string/app_name"> <receiverandroid:name=".TestActivity"> <meta-dataandroid:name="android.appwidget.provider" android:resource="@xml/my_appwidget"> </meta-data> <intent-filter> <actionandroid:name="COM.LJQ.ACTION.WIDGET.CLICK"></action> <actionandroid:name="android.appwidget.action.APPWIDGET_UPDATE"/> </intent-filter> </receiver> </application> <uses-sdkandroid:minSdkVersion="7"/> </manifest>
变量类UtilTool:用来控件文本改变:
packagecom.ljq.activity; publicclassUtilTool{ publicstaticbooleanisChange=true; }
TestActivity类,继承自AppWidgetProvider:
packagecom.ljq.activity; importandroid.app.PendingIntent; importandroid.appwidget.AppWidgetManager; importandroid.appwidget.AppWidgetProvider; importandroid.content.ComponentName; importandroid.content.Context; importandroid.content.Intent; importandroid.widget.RemoteViews; publicclassTestActivityextendsAppWidgetProvider{ //自定义一个Action名 privatestaticfinalStringACTION_CLICK_NAME="COM.LJQ.ACTION.WIDGET.CLICK"; privateRemoteViewsrv; @Override publicvoidonUpdate(Contextcontext,AppWidgetManagerappWidgetManager,int[]appWidgetIds){ System.out.println("onUpdate"); //获取R.layout.main布局,通过类RemoteViews对布局R.layout.main里的控件进行操作 /*rv=newRemoteViews(context.getPackageName(),R.layout.main); IntentintentClick=newIntent(ACTION_CLICK_NAME); PendingIntentpendingIntent=PendingIntent.getBroadcast(context,0,intentClick,0); rv.setOnClickPendingIntent(R.id.tv,pendingIntent); ComponentNamecmp=newComponentName(context,TestActivity.class); AppWidgetManagermyAppWidgetManager=AppWidgetManager.getInstance(context); myAppWidgetManager.updateAppWidget(cmp,rv);*/ finalintN=appWidgetIds.length; for(inti=0;i<N;i++){ intappWidgetId=appWidgetIds[i]; updateAppWidget(context,appWidgetManager,appWidgetId); } } //AppWidget生命周期:每接收一次,广播执行一次为一个生命周期结束。 //也就是说在重写AppWidgetProvider类里面声明全局变量做状态判断, //每次状态改变AppWidgetProvider再接收第二次广播时即为你重新初始化也就是说重新实例化了一次AppWidgetProvider。 //今天我因为在里面放了一个boolean值初始化为true,观察调试看到每次进入都为TRUE故你在设置桌面组件时, //全局变量把它声明在另外一个实体类用来判断是没问题的,切忌放在本类。 @Override publicvoidonReceive(Contextcontext,Intentintent){ System.out.println("onReceive"); if(rv==null){ rv=newRemoteViews(context.getPackageName(),R.layout.main); } if(intent.getAction().equals(ACTION_CLICK_NAME)){ if(UtilTool.isChange){ rv.setTextViewText(R.id.tv,"abc"); }else{ rv.setTextViewText(R.id.tv,"123"); } UtilTool.isChange=!UtilTool.isChange; AppWidgetManagerappWidgetManger=AppWidgetManager.getInstance(context); int[]appIds=appWidgetManger.getAppWidgetIds(newComponentName(context,TestActivity.class)); appWidgetManger.updateAppWidget(appIds,rv); }else{ super.onReceive(context,intent); } } privatevoidupdateAppWidget(Contextcontext, AppWidgetManagerappWidgeManger,intappWidgetId){ rv=newRemoteViews(context.getPackageName(),R.layout.main); IntentintentClick=newIntent(); intentClick.setAction(ACTION_CLICK_NAME); PendingIntentpendingIntent=PendingIntent.getBroadcast(context,0,intentClick,0); rv.setOnClickPendingIntent(R.id.tv,pendingIntent); appWidgeManger.updateAppWidget(appWidgetId,rv); } }
希望本文所述对大家的Android程序设计有所帮助。