Differences
This shows you the differences between two versions of the page.
|
osp:lectures:lecture-services [2016/10/05 11:59] laura.gheorghe |
osp:lectures:lecture-services [2016/11/06 18:55] (current) laura.gheorghe [Lecture] |
||
|---|---|---|---|
| Line 9: | Line 9: | ||
| *{{:osp:lectures:lecture-services.pdf | Lecture Slides}} | *{{:osp:lectures:lecture-services.pdf | Lecture Slides}} | ||
| + | *{{:osp:lectures:4.services_notes.pdf | Lecture Notes}} | ||
| {{url>http://ocw.cs.pub.ro/courses/_media/osp/lectures/lecture-services.pdf}} | {{url>http://ocw.cs.pub.ro/courses/_media/osp/lectures/lecture-services.pdf}} | ||
| Line 23: | Line 24: | ||
| * {{osp:media:lab3.zip|}} | * {{osp:media:lab3.zip|}} | ||
| - | === Task 1 - Creating a started service === | + | === Task 1 - Creating a started service (3p) === |
| Create a new project with a blank main Activity. Add an EditText, a Button and a TextView to the Activity's layout. From the lab files, add the ''PiComputer.java'' class to your project. This class computes the number ''PI'' with variable precisions using the [[https://en.wikipedia.org/wiki/Vi%C3%A8te%27s_formula|Viete series]]. Your first task is to create a started service that will receive a value for the precision, will create an instance of the ''PiComputer'' class giving it the received precision value and call the ''compute()'' method, retrieving the result. | Create a new project with a blank main Activity. Add an EditText, a Button and a TextView to the Activity's layout. From the lab files, add the ''PiComputer.java'' class to your project. This class computes the number ''PI'' with variable precisions using the [[https://en.wikipedia.org/wiki/Vi%C3%A8te%27s_formula|Viete series]]. Your first task is to create a started service that will receive a value for the precision, will create an instance of the ''PiComputer'' class giving it the received precision value and call the ''compute()'' method, retrieving the result. | ||
| Line 86: | Line 87: | ||
| sendBroadcast(i); | sendBroadcast(i); | ||
| </code> | </code> | ||
| - | === Task 2 - Running a foreground service === | + | === Task 2 - Running a foreground service (3p) === |
| We want to have a new service notifying the user that our application is online, providing with a always-present notification which can be used to access the app at any time. | We want to have a new service notifying the user that our application is online, providing with a always-present notification which can be used to access the app at any time. | ||
| Line 120: | Line 121: | ||
| - | === Task 3 - Moving from started service to bounded service === | + | === Task 3 - Moving from started service to bounded service (4p) === |
| We now want to compute the value of ''PI'' using a bounded service instead of a started one. Therefore, create a third service and add it to the ''AndroidManifest.xml''. Within this service's class declare an inner class that extends ''Binder''. Add a method to the class that returns the current instance of the service class: | We now want to compute the value of ''PI'' using a bounded service instead of a started one. Therefore, create a third service and add it to the ''AndroidManifest.xml''. Within this service's class declare an inner class that extends ''Binder''. Add a method to the class that returns the current instance of the service class: | ||
| Line 202: | Line 203: | ||
| </code> | </code> | ||
| - | === Bonus: Task 4 - Connecting to a bounded service from another application === | + | === Bonus: Task 4 - Connecting to a bounded service from another application (4p) === |
| We now want to make a fourth service that will expose the ''PiComputer'' mechanism to external applications. Create a ''IExtService.aidl'' file in the ''src/'' folder of your application, within the same package as all other services. Within the ''.aidl'' file we will declare an interface which will be used by the system to allow external applications access to our internal service's functionality: | We now want to make a fourth service that will expose the ''PiComputer'' mechanism to external applications. Create a ''IExtService.aidl'' file in the ''src/'' folder of your application, within the same package as all other services. Within the ''.aidl'' file we will declare an interface which will be used by the system to allow external applications access to our internal service's functionality: | ||
