Taking the service is as simple as calling the StartService method of the Activity class. This occurs in method of the ContactMap class, just as it has been found that there is a Wi-Fi available. The Code shows how to launch the Service Update. As is the case when a new Activity is released to launch a service is required using a class object of fast mobile recharge the Intent. This object is created linked to the Update class itself, which is the Service component to be started.

 

If there is Wi-Fi available, the service is launched. Otherwise, such a situation is reported to the user and contacts are updated using the information stored in the database on the mobile device itself. Generally, the elements used in a Service Android application cyclically repeating a task which should be simultaneous with other activities carried out by the application. Therefore, almost always a service implements a thread or thread where some fast mobile recharge action develops. Update launches a thread in create method, as shown in Code, which connects to the server using sleep and some time with a sleep.

The Update also has class name attribute MSERVICE containing the server name where you connect ContactMap. This mobile recharge api is the only get here place where reference is made to such address as the construction of object is passed as the parameter value and is using method to launch your HTTP connection. For the server address, the resource defined in the text file is used\ res\ values\ strings. By using methods. GetString, it is possible to directly obtain a string of the specified resource.

 

On the other hand, attribute time represents the time interval to wait between each connection Update. This value, in milliseconds, is also obtained from external resources, but in this case the file\ res\ values\ integers. Where there is a declared named element. The previous section explained as ContactMap regularly updated information with the server, using a service mobile recharge api component embodied in the Update class. This class simply start method, which includes in its attributes therefore the request is to be sent as the response is received.

The class is ContactMap which to write and read the data before and after the connection, respectively. To act in a coordinated manner, Update ContactMap must inform the class when you are connecting, so that you can prepare the request is to be sent. Also, Update ContactMap should also announce that the fast mobile recharge connection has already occurred and that there is available a server response that can be read and processed. These communications have been omitted in paragraph. To focus the reader's attention on running a service element, but they exist.

 

Android allows some degree of communication between an Activity and a service launched by this. However, communication in the other direction, as desired here, is more complex and requires the use of remote interfaces. With this statement a receipt or stub to be used by the other end is generated. The Android AIDL language allows declaring remote interfaces also generate a more information receipt mobile recharge api for the end that will be used can know its nature, but ignore its implementation. AIDL syntax is a very, very simple that merely announces methods and basic data types in addition to types of any kind belonging to the current package.