Android 52 Sticky Broadcast

Sticky broadcast: When the broadcast is sent out, the broadcast receiver has not yet been created and can be received when the broadcast receiver is registered, and if it is not a sticky broadcast, it will no longer be accepted without a broadcast receiver.

Mainactivity:

 Packagecom.sxt.day07_07;Importandroid.app.Activity;Importandroid.content.Intent;ImportAndroid.os.Bundle;ImportAndroid.view.View;ImportAndroid.view.View.OnClickListener; Public classMainactivityextendsActivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Intent Intent=NewIntent ("Com.sxt.day07_07.my_receiver"); Sendstickybroadcast (intent);//send sticky broadcasts, stay waiting for the receiverSetlistener (); }    Private voidSetlistener () {Findviewbyid (r.id.btnstartsecondactivity). Setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View v) {Intent Intent2=NewIntent (mainactivity. This, Secondactivity.class); StartActivity (Intent2);//Start secondactivity            }        }); }}

Secondactivity

 Packagecom.sxt.day07_07;ImportAndroid.os.Bundle;Importandroid.app.Activity;ImportAndroid.content.BroadcastReceiver;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.content.IntentFilter;ImportAndroid.util.Log;ImportAndroid.view.Menu; Public classSecondactivityextendsActivity {myreceiver mreceiver;    Intent mintent; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_second);    Registerreceiver (); }    Private voidRegisterreceiver () {Mreceiver=NewMyreceiver (); Intentfilter Filter=NewIntentfilter ("Com.sxt.day07_07.my_receiver");    Registerreceiver (mreceiver, filter); }        //internal class, Myreceiver can register to receive broadcasts only if Secondactivity is started.     classMyreceiverextendsbroadcastreceiver{@Override Public voidOnReceive (Context context, Intent Intent) {log.i ("Main", "Myreceiver.onreceive ()"); Mintent=Intent; }} @Overrideprotected voidOnDestroy () {Super. OnDestroy (); Removestickybroadcast (mintent);//move out, move out, and you won't receive the broadcast.Unregisterreceiver (Mreceiver);//move out recipient    }}

System description File:

<?XML version= "1.0" encoding= "Utf-8"?><Manifestxmlns:android= "Http://schemas.android.com/apk/res/android" Package= "com.sxt.day07_07"Android:versioncode= "1"Android:versionname= "1.0" >    <USES-SDKandroid:minsdkversion= "8"android:targetsdkversion= "+" />    <uses-permissionAndroid:name= "Android.permission.BROADCAST_STICKY"/>Sticky Broadcast to request permission<ApplicationAndroid:allowbackup= "true"Android:icon= "@drawable/ic_launcher"Android:label= "@string/app_name"Android:theme= "@style/apptheme" >        <ActivityAndroid:name= "Com.sxt.day07_07.MainActivity"Android:label= "@string/app_name" >            <Intent-filter>                <ActionAndroid:name= "Android.intent.action.MAIN" />                <categoryAndroid:name= "Android.intent.category.LAUNCHER" />            </Intent-filter>        </Activity>        <ActivityAndroid:name= "Com.sxt.day07_07.SecondActivity"Android:label= "@string/title_activity_second" >        </Activity>    </Application></Manifest>

Main Page:

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent">    <ButtonAndroid:id= "@+id/btnstartsecondactivity"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:text= "@string/hello_world" /></Relativelayout>

Second page:

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context=". Secondactivity " >    <TextViewAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/hello_world" /></Relativelayout>

Android 52 Sticky Broadcast