Android Broadcast Demo

Specific steps:

1. Initialize the broadcast receiver Broadcastreceiver, and the received broadcast will be recalled in the OnReceive method of the class.

2, registered broadcast registerreceiver(broadcastreceiver,intentfilter);

3, send broadcast sendbroadcast (Intent);

This demo is to verify that the activity that has been overwritten can update the UI itself when the broadcast is received, following the specific code:

The first step is to create the mainactivity and initialize the broadcast receiver Broadcastreceiver, register the broadcast

Public class mainactivity extends appcompatactivity {    private  textview tiptv;    public static final string action_name  =  "Tag_main";     @Override     protected void  OnCreate (bundle savedinstancestate)  {        super.oncreate ( Savedinstancestate);         setcontentview (R.layout.activity_main);         tipTv =  (TextView)  findviewbyid (R.ID.TIPTV);         findviewbyid (R.ID.GOTOTV). Setonclicklistener (new  View.onclicklistener ()  {             @Override             public void onclick (View  V)  {   &NBsp;            intent intent = new  intent (Mainactivity.this, secondactivity.class);                 startactivityforresult (intent, 100);                 tiptv.settext ("Waiting to receive broadcast ... ");            }                  //Registered Radio          registerboradcastreceiver ();     }    //broadcast receiver      private BroadcastReceiver mBroadcastReceiver = new  Broadcastreceiver ()  {        /**          *  broadcast receiver, receive the broadcast callback method          *  @param  context          *  @param  intent         */          @Override         public  void onreceive (context context, intent intent)  {             LOG.D ("MYP",  "=== broadcast callback ===");             String action =  Intent.getaction ();            if  ( Action.equals (action_name))  {                 //when a broadcast is received, the toast is prompted in the topmost activity,                 toast. Maketext (mainactivity.this,  "Broadcast callback",  toast.length_short). Show ();                 string result =  intent.getstringextra ("Yaner");                 tiptv.settext (Result);                 //when a broadcast is received, dialog will receive a broadcast interface prompt and will be hidden with the business logic in that interface,                 //  This shows that when the activity is covered, If the activity business logic is started again, it will execute normally in the activity                  initdialog ();                 timer timer = new timer ();                  timer.schedule (New timertask ()  {                      @Override                      public  Void run ()  {                         if  (dialog != null &&  dialog.isshowing ())                              dialog.dismiss ();                      }                },  3 * 1000);             }         }    };    Dialog dialog;    /**      *  Initialize pop-up box      */    private void  initdialog ()  {        dialog = new dialog ( this);         dialog.setcontentview (R.layout.view_dialog);         dialog.show ();    }    /**      *  Registered broadcast      */    public void  registerboradcastreceiver ()  {        IntentFilter  Filer = new intentfilter ();//Filter conditions          Filer.addaction (action_name);//Set up a broadcast to registerThe label         //registered Radio          Registerreceiver (Mbroadcastreceiver, filer);         LOG.D ("MYP",   "=== broadcast regist ===");     }}

The second step is to create the secondactivity, and the secondactivity implementation trigger can send the broadcast to

The radio events in Mainactivity.

public class secondactivity extends activity {     @Override      protected void oncreate (bundle savedinstancestate)  {         super.oncreate (savedinstancestate);         setcontentview (R.layout.activity_second);         findviewbyid ( R.ID.BRODCASTBTN). Setonclicklistener (New view.onclicklistener ()  {              @Override              public void onclick (VIEW V)  {                 intent mintent = new intent ( Mainactivity.action_name);                 mintent.putextra ("Yaner",  "Receive broadcast success!!! )///When receiving a broadcast, carry data                  //Send broadcast                  Sendbroadcast (mintent);                 LOG.D ("MYP",  "=== broadcast send ===");             }        });     }}

XML layout file is relatively simple, it is not given, the effect of running:

1, click the button, Toast prompt in secondactivity directly prompt

2, click the button, in 3 seconds return mainactivity,dialog normal display, 3 seconds after the disappearance

3, after the click button, after 3 seconds to return Mainactivity,dialog has disappeared

Conclusion: The covered activity can update the UI itself when it receives the broadcast

This article is from the "10924237" blog, please be sure to keep this source http://10934237.blog.51cto.com/10924237/1726810

Android Broadcast Demo