android - how to detect and notify user of message from server? -

app sent transaction server, user closes app, message needs sent phone server 10+ minutes later. phone may asleep, or user might checking email. question have is:

1. how can phone notified message has been received server ?
2. how display message ?

a possible solution google cloud messaging, still not able answer these 2 questions

1) have use service that.

2) , show message.

do this.

the variable , method members of service class:

public final static string action = "com.apps.example.mainactivity";  private void messagefromserver()//this method sends broadcast messages  {     intent intent = new intent(movement_update);     string messagefromserver=servermessage //here put server message     intent.putextra("messagefromserver", messagefromserver);      sendbroadcast(intent); } 

and methods main activity:

you have register receiver in onresume method:

@override public void onresume() {         intentfilter intentfilter;     intentfilter= new intentfilter(yourservice.action);     messagefromserver= new messagefromserver();     registerreceiver(messagefromserver, intentfilter);       startyourservice();      super.onresume(); }  private void startyourservice() {     startservice(new intent(this, yourservice.class)); }  public class messagefromserver extends broadcastreceiver {   @override     public void onreceive(context context, intent intent)     {              // method receives broadcast messages.               // sure modify androidmanifest.xml file in              // order enable message receiving          string messagefromserver = intent.getstringextra("messagefromserver");          updategui();// here can update ui     } } 

and put service in manifest file.

 <service android:name="com.apps.service.yourservice" ></service>