Android four components of the Broadcastreceiver

(1) Two ways to register Broadcastreceiver

When we create a broadcast receiver class that inherits from Broadcastreceiver, in order to register in the program, the first way to register is XML, in the Mainfest registration file to register, the registered XML code is as follows

<application        android:allowbackup= "true"        android:icon= "@drawable/ic_launcher"        android:label= "@ String/app_name "        android:theme=" @style/apptheme ">        <activity            android:name=". Mainactivity "            android:label=" @string/app_name ">            <intent-filter>                <action android:name=" Android.intent.action.MAIN "/>                <category android:name=" Android.intent.category.LAUNCHER "/>            </intent-filter>        </activity>        <receiver android:name= "Myreceiver" >            < intent-filter>                <action android:name= "Dengchaoqun. Reciever "/>            </intent-filter>        </receiver>    </application>

And then send the broadcast in the program

Intent intent=new Intent ("Dengchaoqun. Reciever ");
Sendbroadcast (Intent);

(2) dynamic registration via Java code

PrivateButton btnstart; PrivateButton Btnstop; Privatebroadcastreceiver Receiver; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);                Setcontentview (R.layout.activity_main); //Dynamic Registration BordcastreceverReceiver=NewMyreceiver (); Intentfilter Filter=NewIntentfilter ("Myreceiver");                Registerreceiver (receiver, filter); Btnstart=(Button) Findviewbyid (R.id.button1); Btnstop=(Button) Findviewbyid (R.id.button2); Btnstart.setonclicklistener (NewView.onclicklistener () {@Override Public voidOnClick (View v) {//static mode                /*Intent intent=new Intent ("Dengchaoqun.                Reciever "); Sendbroadcast (intent);*/Intent Intent=NewIntent ("Myreceiver");            Sendbroadcast (Intent);                }        }); Btnstop.setonclicklistener (NewView.onclicklistener () {@Override Public voidOnClick (View v) {unregisterreceiver (receiver);    }        }); }

(3) Destruction Unregisterreciever (receiver) of the recipient's object;

(4) In the recipient object

@Override
public void OnReceive (context context, Intent Intent) {
Toast.maketext (context, "test", "a"). Show ();
}

Time-consuming operations cannot be performed in the Onreceiver, and if there is a time-consuming operation, the thread must be called, or the intent startup services will complete

Android four components of the Broadcastreceiver