Android 48 broadcast

The system starts to reboot will send the power-on restart broadcast, low power will send low-battery broadcast, broadcast registration has 2 kinds: System description file XML registration and Java code Registration, the former is static registration (global registration) The latter is a dynamic registration (relying on the time of the building, component destruction will not receive the broadcast).

Activity.java

 Packagecom.sxt.day07_04;Importandroid.app.Activity;ImportAndroid.content.BroadcastReceiver;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.content.IntentFilter;ImportAndroid.os.Bundle;ImportAndroid.util.Log;ImportAndroid.view.View;ImportAndroid.view.View.OnClickListener; Public classMainactivityextendsActivity {MyReceiver2 mreceiver; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Registerreceiver ();    Setlistener (); }    Private voidSetlistener () {Sendbroadcast1clicklistener ();    Sendbroadcast2clicklistener (); }    Private voidSendbroadcast2clicklistener () {Findviewbyid (r.id.btnsendbroadcast_2). Setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View v) {Intent Intent=NewIntent ("Com.sxt.day07_04.MyReceiver2");//Intent.putextra ("Key", "Hello android!");            Sendbroadcast (Intent);    }        }); }    Private voidSendbroadcast1clicklistener () {Findviewbyid (r.id.btnsendbroadcast_1). Setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View v) {Intent Intent=NewIntent ("Com.sxt.day07_04.MyReceiver1"); Intent.putextra ("Key", "Hello java!");            Sendbroadcast (Intent);    }        }); }    //broadcast receivers for Java class registrations    Private voidRegisterreceiver () {Mreceiver=NewMyReceiver2 (); Intentfilter Filter=NewIntentfilter ();//Intent FilterFilter.addaction ("Com.sxt.day07_04.MyReceiver2");//the broadcast stringRegisterreceiver (mreceiver, filter); }    classMyReceiver2extendsbroadcastreceiver{@Override//method of receiving broadcast execution         Public voidOnReceive (Context context, Intent Intent) {log.i ("Main", "Myreceiver2.onreceive ():" +intent.getstringextra ("key")); }} @Overrideprotected voidOnDestroy () {Super. OnDestroy (); //when the activity exits, cancel the broadcast registration and release the resources.Unregisterreceiver (Mreceiver); }}

Broadcast 1.java

 Packagecom.sxt.day07_04;ImportAndroid.content.BroadcastReceiver;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.util.Log; Public classMyReceiver1extendsBroadcastreceiver {@Override//methods to be executed after receiving a broadcast     Public voidOnReceive (Context context, Intent Intent) {log.i ("Main", "Myreceiver1.onreceive ():" +intent.getstringextra ("key")); }}

System description File:

<?XML version= "1.0" encoding= "Utf-8"?><Manifestxmlns:android= "Http://schemas.android.com/apk/res/android" Package= "Com.sxt.day07_04"Android:versioncode= "1"Android:versionname= "1.0" >    <USES-SDKandroid:minsdkversion= "8"android:targetsdkversion= "+" />    <ApplicationAndroid:allowbackup= "true"Android:icon= "@drawable/ic_launcher"Android:label= "@string/app_name"Android:theme= "@style/apptheme" >        <ActivityAndroid:name= "Com.sxt.day07_04.MainActivity"Android:label= "@string/app_name" >            <Intent-filter>                <ActionAndroid:name= "Android.intent.action.MAIN" />                <categoryAndroid:name= "Android.intent.category.LAUNCHER" />            </Intent-filter>        </Activity>registering a global broadcast recipient<receiverAndroid:name= "Com.sxt.day07_04.MyReceiver1">broadcast receiver Class<Intent-filter>                <ActionAndroid:name= "Com.sxt.day07_04.MyReceiver1"/>The broadcast string is the one that can receive the broadcast</Intent-filter>        </receiver>    </Application></Manifest>

Android 48 broadcast