Broadcastreceiver broadcast receiver (4) -- localbroadcastmanager for local broadcast and dialog in onreceive ()

Mainactivity is as follows:

Package CC. CV; import android. OS. bundle; import android. support. v4.content. localbroadcastmanager; import android. view. view; import android. view. view. onclicklistener; import android. widget. button; import android. app. activity; import android. content. context; import android. content. intent; import android. content. intentfilter;/*** demo Description: * 1. Use the complete example of local broadcast localbroadcast. * 2. Use the onreceive () method to display the dialog ** features of local broadcast: * 1 local broadcast can only be transmitted in this app, and the broadcast receiver can only receive broadcasts from this app. * In this case, other applications may be prevented from obtaining sensitive data in the broadcast to ensure data security. ** 2 local broadcast can only be dynamically registered in code. * static registration is mainly used to enable the program to receive broadcasts even when it is not started. when sending a local broadcast *, our app must have been started, so static registration is not required at all. otherwise, this local * broadcast has no special features. * ** Note: * in the onreceive () method of the broadcast, the dialog * 1 is displayed to set the type * Dialog for the dialog. getwindow (). settype (windowmanager. layoutparams. type_system_alert); * 2 pay attention to permissions * <uses-Permission Android: Name = "android. permission. sy Stem_alert_window "/> ** reference: * http://blog.csdn.net/guolin_blog * Thank you very much */public class mainactivity extends activity {private button mbutton; private intent mintent; private context mcontext; private intentfilter mintentfilter; private localbroadcastmanager mlocalbroadcastmanager; private localbroadcastreceiver mlocalbroadcastreceiver; @ overrideprotected void oncreate (bundle savedinst Ancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); Init ();} private void Init () {mcontext = This; mbutton = (button) findviewbyid (R. id. button); mbutton. setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view) {registerlocalbroadcastreceiver (); sendlocalbroadcast ();}});} /*** register the local broadcast receiver */private void registerlocalbroadcastreceiver () {mintentfilter = new intent Filter ("test_action"); mlocalbroadcastreceiver = new localbroadcastreceiver (); mlocalbroadcastmanager = localbroadcastmanager. getinstance (mcontext); mlocalbroadcastmanager. registerreceiver (mlocalbroadcastreceiver, mintentfilter);}/*** send local broadcast */private void sendlocalbroadcast () {mintent = new intent ("test_action"); mintent. putextra ("Number", "9527"); mlocalbroadcastmanager. sendbroadcast (mintent); // cancel the local broadcast after the broadcast is sent. Register unregisterlocalbroadcastreceiver ();}/*** cancel registration of local broadcast */private void unregisterlocalbroadcastreceiver () {If (mlocalbroadcastmanager! = NULL) {If (mlocalbroadcastreceiver! = NULL) {mlocalbroadcastmanager. unregisterreceiver (mlocalbroadcastreceiver) ;}}@ overrideprotected void ondestroy () {super. ondestroy (); merge ();}}

Localbroadcastreceiver is as follows:

Package CC. CV; import android. app. alertdialog. builder; import android. app. dialog; import android. content. broadcastreceiver; import android. content. context; import android. content. dialoginterface; import android. content. intent; import android. view. windowmanager; public class localbroadcastreceiver extends broadcastreceiver {@ overridepublic void onreceive (context, intent) {string message = intent. getstringextra ("Number"); showdialoginbroadcastreceiver (context, message);}/*** in the onreceive () method of broadcast, dialog * 1 is displayed to set type * Dialog for dialog. getwindow (). settype (windowmanager. layoutparams. type_system_alert); * 2 pay attention to permissions * <uses-Permission Android: Name = "android. permission. system_alert_window "/> */private void showdialoginbroadcastreceiver (context, string message) {Builder = new Builder (context); builder. seticon (R. drawable. ic_launcher); builder. settitle ("title"); builder. setmessage (Message); builder. setnegativebutton ("OK", new dialoginterface. onclicklistener () {@ override public void onclick (dialoginterface dialog, int arg1) {dialog. dismiss () ;}}); dialog = builder. create (); dialog. getwindow (). settype (windowmanager. layoutparams. type_system_alert); dialog. show ();}}

Main. XML is as follows:

<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"> <button Android: id = "@ + ID/button" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: layout_centerinparent = "true" Android: TEXT = "Send local broadcast"/> </relativelayout>

Broadcastreceiver broadcast receiver (4) -- localbroadcastmanager for local broadcast and dialog in onreceive ()