Saturday, 23 April 2016

Intent



Android Intent is the message that is passed between components such as activities, content providers, broadcast receivers, services etc.

 It is generally used with startActivity() method to invoke activity, broadcast receivers etc.

 The dictionary meaning of intent is intention or purpose. So, it can be described as the intention to do action.

 The LabeledIntent is the subclass of android.content.Intent class.

 Android intents are mainly used to:


  • Start the service
  • Launch an activity
  • Display a web page
  • Display a list of contacts
  • Broadcast a message
  • Dial a phone call etc.

Types of Android Intents

There are two types of intents in android: implicit and explicit.

Implicit Intent

Implicit Intent doesn't specify the component. In such case, intent provides information of available components provided by the system that is to be invoked.

For example, you may write the following code to view the webpage.


 Intent intent=new Intent(Intent.ACTION_VIEW);   
 intent.setData(Uri.parse("http://androidtutorialforum.blogspot.in/"));   
 startActivity(intent);

Explicit Intent

Explicit Intent specifies the component. In such case, intent provides the external class to be invoked it is call directly with class name.

 
 Intent intent = new Intent(getApplicationContext(), ExampleActivity.class);   
 startActivity(intent);






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