Intents are asynchronous message which allow application components to request functionality from other Android components.
The dictionary meaning of Intent is Intention or purpose. So it can be described as the intention to do action.
Android intent is the message that is passed between components such as content providers, activities, broadcast recievers, services etc.
Android Intents are mainly used to:
- start a service
- dial a phone call
- Broadcast a message
- Display a list of contacts
- Display a web page
The LabeledIntent is the subclass of android.content.Intent class.
An intent can contain data via a Bundle. This data can be used by the receiving component.
In Android the reuse of other application components is a concept known as task. An application can access other Android components to achieve a task.
Starting activities or services:
To start an activity you have to use a method startActivity().This method is defined the Context object which Activity extends.
The following code demonstrates how you can start activity via intent.
Intent i = new Intent (this,Login.class);
Activities which are started by other android activities are called sub-activities. To start a service via intents, use the startService(Intent) method call.
Types of Android Intents:
There are two types of Intents in android which are as follows:
- Implicit Intent
- Explicit Intent
These Intents do not name a target and the field for the component name is left blank. Implicit Intents are also used to activate components of other activities.
Intent i= new Intent();
Explicit intent going to be connected intenal world of application. Explicit Intent specifies the components. In such case,intent provides the external class to be invoked.
Intent i= new Intent();
Let’s see a simple example of Intent that take from one activity to another activity.
First Activity XML:
Second Activity XML:
In above example, there are two xml activity in which first is our main and login activity in which we take two edit text for email and password and a login button to submit the data by which on click we reach at the other activity where we take an edit text and show welcome as a text.
With the help of java we write code and by intent we connect two activities as first activity with the second.
Also Read- Model View Controller (MVC) Pattern
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