Example of jointly updating the UI of service and broadcast

Sa111111 was published at a.m. On in [Android instance] [Copy link] [just look at the landlord] [previous topic] [next topic]

In Android, the UI is updated asynchronously. We usually use handler to start the thread or sendmessage, so the UI can be updated by using service and broadcast, for example:
We create a service:
Package com. Andy
Import Android. App. Service; // introduce related packages
Import Android. content. broadcastreceiver; // introduce the related package
Import Android. content. Context; // introduce related packages
Import Android. content. Intent; // introduce related packages
Import Android. content. intentfilter; // introduce related packages
Import Android. OS. ibinder; // introduce related packages
// Inherit from the subclass of the service
Public class myservice extends Service {
Commandreceiver cmdreceiver;
Boolean flag;
@ Override
Public void oncreate () {// override the oncreate Method
Flag = true;
Cmdreceiver = new commandreceiver ();
Super. oncreate ();
}
@ Override
Public ibinder onbind (intent) {// rewrite the onbind Method
// Todo auto-generated method stub
Return NULL;
}
@ Override
Public int onstartcommand (intent, int flags, int startid) {// override the onstartcommand Method
Intentfilter filter = new intentfilter (); // create an intentfilter object
Filter. addaction ("WYF. WPF. myservice ");
Registerreceiver (cmdreceiver, filter); // register broadcast Receiver
Dojob (); // call the method to start the thread
Return super. onstartcommand (intent, flags, startid );
}
// Method:
Public void dojob (){
New thread (){
Public void run (){
While (FLAG ){
Try {// sleep for a period of time
Thread. Sleep (1000 );
}
Catch (exception e ){
E. printstacktrace ();
}
Intent intent = new intent (); // create an intent object
Intent. setaction ("WYF. WPF. sample_3_6 ");
Intent. putextra ("data", math. Random ());
Sendbroadcast (intent); // send Broadcast
}
}

}. Start ();
}
Private class commandreceiver extends broadcastreceiver {// inherit from the subclass of broadcastreceiver
@ Override
Public void onreceive (context, intent) {// override the onreceive Method
Int cmd = intent. getintextra ("cmd",-1); // get extra information
If (cmd = sample_3_6.cmd_stop_service) {// if the message sent is to stop the service
Flag = false; // stop the thread
Stopself (); // stop the service
}
}
}
@ Override
Public void ondestroy () {// override the ondestroy Method
This. unregisterreceiver (cmdreceiver); // cancel the registered commandreceiver.
Super. ondestroy ();
}
}

Create an activity

Package com. Andy; // declare the package statement
Import Android. App. Activity; // introduce related packages
Import Android. content. broadcastreceiver; // introduce the related package
Import Android. content. Context; // introduce related packages
Import Android. content. Intent; // introduce related packages
Import Android. content. intentfilter; // introduce related packages
Import Android. OS. Bundle; // introduce related packages
Import Android. View. view; // introduce related packages
Import Android. View. View. onclicklistener; // introduce the related package
Import Android. widget. Button; // introduce related packages
Import Android. widget. textview; // introduce related packages
// Inherit from the subclass of activity
Public class sample_3_6 extends activity {
Public static final int maid = 0;
Button btnstart; // starts to serve the button object application.
Button btnstop; // stop the service Button Object Application
Textview TV; // textview object application
Datareceiver; // broadcastreceiver object
@ Override
Public void oncreate (bundle savedinstancestate) {// rewrite the oncreate Method
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main); // you can specify the displayed screen.
Btnstart = (button) findviewbyid (R. Id. btnstart );
Btnstop = (button) findviewbyid (R. Id. btnstop );
TV = (textview) findviewbyid (R. Id. TV );
Btnstart. setonclicklistener (New onclicklistener () {// Add a click event listener for the button
@ Override
Public void onclick (view v) {// override the onclick Method
Intent myintent = new intent (sample_3_6.this, WYF. WPF. myservice. Class );
Sample_3_6.this.startservice (myintent); // send intent to start the service
}
});
Btnstop. setonclicklistener (New onclicklistener () {// Add a click event listener for the button
@ Override
Public void onclick (view v) {// override the onclick Method
Intent myintent = new intent (); // create an intent object
Myintent. setaction ("WYF. WPF. myservice ");
Myintent. putextra ("cmd", cmd_stop_service );
Sendbroadcast (myintent); // send Broadcast
}
});
}
Private class datareceiver extends broadcastreceiver {// inherit from the subclass of broadcastreceiver
@ Override
Public void onreceive (context, intent) {// override the onreceive Method
Double Data = intent. getdoubleextra ("data", 0 );
TV. settext ("service data:" + data );
}
}
@ Override
Protected void onstart () {// rewrite the onstart Method
Datareceiver = new datareceiver ();
Intentfilter filter = new intentfilter (); // create an intentfilter object
Filter. addaction ("WYF. WPF. sample_3_6 ");
Registerreceiver (datareceiver, filter); // register broadcast Receiver
Super. onstart ();
}
@ Override
Protected void onstop () {// rewrite the onstop Method
Unregisterreceiver (datareceiver); // cancel registering a broadcast Receiver
Super. onstop ();
}

}