Android Learning notes broadcast intent and broadcast recipient Mybroadcastreceiver, broadcast

(1) First to register with an XML file

Layout file, add a button click on the time to broadcast

<relativelayout xmlns: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=". Mainactivity ">    <button        android:id=" @+id/button1 "        android:layout_width=" Wrap_content        " android:layout_height= "Wrap_content"        android:layout_alignparentleft= "true"        android:layout_ Alignparenttop= "true"        android:layout_marginleft= "68DP"        android:layout_margintop= "82DP"        android: text= "button"/></relativelayout>

Mainactivity.java

Package Com.lc.broadcastreceiver_demo;import Android.app.activity;import Android.content.intent;import Android.os.bundle;import Android.view.menu;import Android.view.view;import Android.view.View.OnClickListener; Import Android.widget.button;import Com.example.broadcastreceiver_demo. r;/* * The broadcast recipient registered with the XML file needs to register the * <receiver android:name= "Com.lc.broadcastreceiver_demo in the manifest file. Mybroadcastreceiver "> <intent-filter> <action android:name=" Com.freedie.broadcast " /> </intent-filter> </receiver> */public class Mainactivity extends Activity {private but ton button, @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main), Button = (button) This.findviewbyid (r.id.button1),/* * * When the button is clicked */ Button.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {if (R.id.button1 = = V.getid ()) { Intent Intent = new Intent (); Intent.setaction ("CoM.freedie.broadcast "); Sendbroadcast (intent); Send broadcast Intent}}); @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (R.menu.main, menu); return true;}}

Mybroadcastreceiver.java the recipient of the broadcast, to inherit the Broadcastreceiver class, and to overload the OnReceive method:

Package Com.lc.broadcastreceiver_demo;import Android.content.broadcastreceiver;import Android.content.Context; Import Android.content.intent;import android.util.log;/* * Broadcast recipient, the OnReceive callback method executes */public class when the broadcast recipient receives the broadcast intent Mybroadcastreceiver extends Broadcastreceiver {private static final String TAG = "Mybroadcastreceiver"; @Overridepublic void OnReceive (Context context, Intent Intent) {if ("Com.freedie.broadcast". Equals (Intent.getaction ())) {LOG.D (TAG, " Com.freedie.broadcast Intent was receiverd! ");}}}

To register a broadcast in the manifest file:

<?xml version= "1.0" encoding= "Utf-8"? ><manifest xmlns:android= "http://schemas.android.com/apk/res/ Android "package=" Com.example.broadcastreceiver_demo "android:versioncode=" 1 "android:versionname=" 1.0 "> & LT;USES-SDK android:minsdkversion= "8" android:targetsdkversion= "/> <application android: Allowbackup= "true" android:icon= "@drawable/ic_launcher" android:label= "@string/app_name" Android:them E= "@style/apptheme" > <activity android:name= "Com.lc.broadcastreceiver_demo. 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> <!--registration of Mybroadcastreceiver <receiver android:name= "Com.lc.broadcastreceiver_demo. MyBRoadcastreceiver "> <intent-filter> <action android:name=" Com.freedie.broadcast "/&G            T </intent-filter> </receiver> </application></manifest>

(2) The second use of Java code to register

The layout file does not change (contains a button when clicked to broadcast), the manifest file is not allowed to operate, the Mybroadcastreceiver.java file does not change, only applies to test whether receive success! ：

Mainactivity.java

Package Com.example.broadcastreceiver_javacode;import Android.os.bundle;import Android.app.activity;import Android.content.intent;import Android.content.intentfilter;import Android.view.menu;import Android.view.View; Import Android.view.view.onclicklistener;import Android.widget.button;public class Mainactivity extends Activity { Private Button button;private mybroadcastreceiver mybroadcastreceiver, @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); button = (button) This.findviewbyid (R.id.button1); Button.setonclicklistener (new Onclicklistener () {@Overridepublic void OnClick (View V) {if (R.id.button1 = = V.getid ()) {Intent Intent = new Intent (); Intent.setaction ("Com.freedie.brodcast"); sendbroadcast (intent); Send broadcast}});} /* Register a broadcast program here */@Overrideprotected void Onresume () {super.onresume (); mybroadcastreceiver = new Mybroadcastreceiver () ;//Intent filter Intentfilter filter = new Intentfilter (); Filter.addaction ("com. Freedie.brodcast ");//Register the broadcast recipient Registerreceiver (Mybroadcastreceiver, filter);} /* * Write off the broadcast recipient */@Overrideprotected void OnStop () {super.onstop (); Unregisterreceiver (mybroadcastreceiver);} @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (R.menu.main, menu); return true;}}

Android Learning notes broadcast intent and broadcast recipient Mybroadcastreceiver, broadcast