消息广播实战

《通信业务开发》课程消息广播实战消息广播实战使用方法实例演示PART20-2使用方法示例创建广播接收类，继承BroadcastReceiver注册BroadcastReceiver：静态:<receiver>+<intent-filter>动态:registerReceiver+IntentFilter事件驱动，发送广播：Context.sendBroadcast()Context.sendOrderBroadcast()Context.sendStickBroadcast()步骤事件：系统事件（如变换时区、电量低报警）、App事件（点击按钮）……实例演示publicclassReceiverAc1extendsBroadcastReceiver{@OverridepublicvoidonReceive(Contextcontext,Intentintent){

NotificationManagernoteMan=(NotificationManager)context.getSystemService(android.content.Context.NOTIFICATION_SERVICE);Notificationnote=newNotification(R.drawable.icon,"ReceiverNote1",System.currentTimeMillis());PendingIntentpendIt=PendingIntent.getActivity(context,0,

newIntent(context,sendAc.class),0);note.setLatestEventInfo(context,"Note1","ReceiverNote1",pendIt);noteMan.notify(0,note);}}<applicationandroid:icon="@drawable/icon"android:label="@string/app_name">……

<!--系统静态注册-->

<receiverandroid:name=".ReceiverAc1"android:label="Receiver1"><intent-filter><actionandroid:name="com.lily.ACTION_SEND1"/></intent-filter></receiver></application>BroadcastReceiver1实例演示BroadcastReceiver可在Manifest中静态注册，也可在Activity中动态注册，但不可重复注册publicclassReceiverAc1extendsBroadcastReceiver{@OverridepublicvoidonReceive(Contextcontext,Intentintent){

Toast.makeText(context,"Receiver2:"+intent.getStringExtra("name")+““+intent.getIntExtra("age",0),Toast.LENGTH_LONG).show();}publicclasssendAcextendsActivity{ReceiverAc2receiver2=newReceiverAc2();……@OverrideprotectedvoidonResume(){//代码动态注册，通常建议在OnResume方法中注册广播接收者IntentFilterintentFilter2=newIntentFilter("com.lily.ACTION_SEND2");intentFilter2.addAction("com.lily.ACTION_SEND2");registerReceiver(receiver2,intentFilter2);super.onResume();}@OverrideprotectedvoidonPause(){//代码动态注销，通常建议在OnPause方法中注销广播接收者unregisterReceiver(receiver2);super.onPause();}BroadcastReceiver2实例演示//重复注册：在代码中动态注册，同时也在AndroidManifest.xml中静态注册，会导致无法接收！BroadcastReceiver可在Manifest中静态注册，也可在Activity中动态注册，但不可重复注册publicclasssendAcextendsActivity{//ReceiverAc1receiver1=newReceiverAc1();ReceiverAc2receiver2=newReceiverAc2();@Override

publicvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);setContentView(R.layout.main);

}……@OverridepublicbooleanonOptionsItemSelected(MenuItemitem){switch(item.getItemId()){case1:IntentitSend1=newIntent();itSend1.setAction("com.lily.ACTION_SEND1");itSend1.putExtra("name","Lily");itSend1.putExtra("age",20);

sendBroadcast(itSend1);break;case2:IntentitSend2=newIntent();itSend2.setAction("com.lily.ACTION_SEND2");itSend2.putExtra("age",23);itSend2.putExtra("name","Mi