badbrazil.blogg.se - Android studio intent service

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Let me introduce you to the ImageIntentService. The service’s onCreate method will be called on the main thread, but subsequent calls to handleIntent are guaranteed by Android to be on a background thread (and this is where you should put your long-running code in any case). The intent service is specifically constructed to handle large amounts of work and processing off the main thread. I.putExtra("url", getIntent().getExtras().getString("url")) Īt this point, the system will construct a new instance of your service, call its onCreate method, and then start firing data at the IntentService’s handleIntent method. Here’s the code to do exactly that: Intent i = new Intent(this, ImageIntentService.class) It will then allow you to (as I showed you earlier with activities) explicitly launch your service. In order for the system to find your service when required, you’ll need to declare it in your manifest, like so: Īt a minimum, you’ll need to have this simple declaration. Services are, essentially, classes that run in the background with no access to the screen.

To demonstrate, I’ll show you how to download the same image, this time from the IntentService rather than the AsyncTask. The IntentService has no such restriction. The AsyncTask will always take over the main thread at least twice (with its pre- and post-execute methods), and it must be owned by an activity that is able to draw to the screen. The IntentService is an excellent way to move large amounts of data around without relying on any specific activity or even application. Creating Android Applications: Develop and Design