appWidget 简单入门学习笔记
1,让桌面能够添加你的appWidget 1,一个类,和2个xml //一个实现AppWidgetProvider的类 publicclassTomAppWidgetProviderextends AppWidgetProvider{} <!--放在res/xml文件夹中命名为tom_appwidget_info.xml--> <appwidget-providerxmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="294dp" android:minHeight="72dp" android:updatePeriodMillis="86400000" android:initialLayout="@layout/tom_appwidget" android:configure="kg.tom.AppWidgetConfigure"></appwidget-provider> <!--android:initialLayout:初始化你的appWidget布局--> <!--放置在res/layout/tom_appwidget_provider.xml--> <?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="294dp" android:layout_height="72dp" android:orientation="vertical"><TextView android:id="@+id/appwidget_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#ff000000"/><Button android:id="@+id/appwidget_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@android:string/ok"/> </LinearLayout> 在AndroidManifest.xml中声明你的appWidget <receiverandroid:name="TomAppWidgetProvider"> <intent-filter> <!--让系统能够设别到你的appWidgetProvider的动作--><actionandroid:name="android.appwidget.action.APPWIDGET_UPDATE"/> </intent-filter> <!--设置你的appWidget的布局--> <meta-dataandroid:name="android.appwidget.provider"android:resource="@xml/tom_appwidget_info"/> </receiver> 长按你的Home 界面,你就会看到你的widget已经在列表当中 但是,现在点击是会出错的,这时候我们需要设置我们的AppWidgetConfigure 在activity中增加一个Intent-filter <intent-filter> <!--让系统能够设别到你的appWidgetProvider的动作--> <actionandroid:name="android.appwidget.action.APPWIDGET_UPDATE"/> </intent-filter> publicclassAppWidgetConfigureextendsActivity{ @Override publicvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); //设置widgetId intmAppWidgetId=AppWidgetManager.INVALID_APPWIDGET_ID; //1,将setResult设置为取消,用于取消widgethostsetResult(RESULT_CANCELED); //2,从Intent中找到widget的id Intentintent=getIntent(); Bundleextras=intent.getExtras(); if(extras!=null){ mAppWidgetId=extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID,AppWidgetManager.INVALID_APPWIDGET_ID);} //3,如果获取不到appWidgetid我们就结束 if(mAppWidgetId==AppWidgetManager.INVALID_APPWIDGET_ID){ Log.d("app","获取失败退出!!!"); finish();} finalContextcontext=AppWidgetConfigure.this; //4,实例化你的appWidget AppWidgetManagerappWidgetManager=AppWidgetManager.getInstance(context); //5,更新widget IntentresultValue=newIntent();resultValue.putExtra(appWidgetManager.EXTRA_APPWIDGET_ID,mAppWidgetId); setResult(RESULT_OK,resultValue); finish();}} 2,然后写provider的代码 publicclassTomAppWidgetProviderextendsAppWidgetProvider{ @Override publicvoidonUpdate(Contextcontext,AppWidgetManagerappWidgetManager, int[]appWidgetIds){ //TODOAuto-generatedmethodstub super.onUpdate(context,appWidgetManager,appWidgetIds); finalintN=appWidgetIds.length; Log.d("app","onUpdate--->Ids==="+String.valueOf(N)); for(inti=0;i<N;i++){ intappWidgetId=appWidgetIds[i]; updateAppWidget(context,appWidgetManager,appWidgetId);}} staticvoidupdateAppWidget(Contextcontext,AppWidgetManagerappWidgetManager,intappWidgetId){ Log.d("app","update---->id"+appWidgetId); //1,widget中的的标题 CharSequencetext="这是我第一个widget"; //2,widget显示用布局,并设置text显示的值 RemoteViewsviews=newRemoteViews(context.getPackageName(),R.layout.tom_appwidget_provider);views.setTextViewText(R.id.appwidget_text,text); //3,通知widgetmanager更新appWidgetManager.updateAppWidget(appWidgetId,views);} @Override publicvoidonDeleted(Contextcontext,int[]appWidgetIds){ //TODOAuto-generatedmethodstubsuper.onDeleted(context,appWidgetIds); //删除的时候调用的方法 intappids=appWidgetIds.length; Log.d("app","onDelete--->"+appids);}} 然后就可以运行了: 顺便附上一张简单原理图:.. 2,小小的进阶为widget实现运行activity 只要在加上几行代码的appwidget 就能实现挑战到Activity的功能 1,新建一个HelloAppWidget的activity staticvoidupdateAppWidget(Contextcontext,AppWidgetManagerappWidgetManager,intappWidgetId){ Log.d("app","update---->id"+appWidgetId); //1,设置显示用标题 CharSequencetext="这是我第一个widget"; //1.1,增加跳转用activity相关intent Intentintent=newIntent(context,HelloAppWidget.class); PendingIntentpendingIntent=PendingIntent.getActivity(context,0,intent,0); //2,如果,没有在xml中声明RemoteViews布局,这里就必须要让其他布局基于RemoteViews RemoteViewsviews=newRemoteViews(context.getPackageName(),R.layout.tom_appwidget_provider);views.setTextViewText(R.id.appwidget_text,text); //2.1将需要跳转的intent绑定到appWidgetbutton中views.setOnClickPendingIntent(R.id.appwidget_button,pendingIntent); //3,通知widgetmanager更新appWidgetManager.updateAppWidget(appWidgetId,views);} 跳转到特定activity…ps:使用activity记得在AndroidManifest.xml中注册
