When you explicitly define which Android component should be opened on some user action, then you use explicit intents.
In Android, there are two types of Intents: You can deliver a broadcast to other apps by passing an Intent to sendBroadcast() or sendOrderedBroadcast(). The system delivers various broadcasts for system events, such as when the system boots up or the device starts charging. The Intent describes which service to start and carries any necessary data.Ī broadcast is a message that any app can receive. You can start a service to perform a one-time operation(such as downloading a file) by passing an Intent to startService(). The Intent describes the activity to start and carries any necessary data along.Ī Service is a component that performs operations in the background and does not have a user interface. You can start a new instance of an Activity by passing an Intent to startActivity(). To start an ActivityĪn Activity represents a single screen in an app. There are three fundamental uses of intents: 1. If multiple apps are capable of responding to the message then Android provides the user with a list of those apps from which a choice can be made. It can be within that same app or some other app as well.
It's like a message that Android listens for and then react accordingly by identifying and invoking the app's appropriate component (like an Activity, Service, Content Provider, etc.). It's a way to communicate between Android components to request an action from a component, by different components. An Intent is basically an intention to do an action. Have you ever wondered how a new Activity opens when we click on some button, suppose the settings button to show the Settings screen in any app? How does the app opens up when we click on its notification? How do we get Low battery alert in our mobile? All these things are possible because of Intent in Android.Īn Intent is a messaging object that you can use to request an action from an app component. Android SDK Manager & required Packages.
Just place the following code in MainActivity.java package in.ruks. One by one we are going to call setOnClickListener method on each of our Button and call built-in applications. Fifth step : Our Buttons are ready to have some action, now its time to attach the event handler to them.
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