Use an explicit intent when your code knows which Android component should receive the request—typically for navigation within your app and for starting your own service. Use an implicit intent when you want Android to find an app that can perform an action, such as sharing content. The difference is how the recipient is selected; either kind of intent can carry data and extras.
What is the difference between explicit and implicit intents?
An intent is a message Android uses to request an action from a component. An explicit intent names its target component. An implicit intent describes the action and may include data or a category, but does not name the component; Android looks for a component that can handle it.
| Decision | Explicit intent | Implicit intent |
|---|---|---|
| How the recipient is chosen | Your code names the component, such as with Intent(context, TargetActivity::class.java). |
Android resolves the request to a component whose intent filter matches. |
| Typical fit | A known destination in your app, deterministic navigation, or starting your own service. | Handing a supported task to another app, or exposing an activity as a discoverable entry point. |
| Recipient choice | The target is fixed by the intent. | If multiple apps match, Android may show a selection interface; a chooser can let the user choose an app for that action. |
| Main implementation concern | Check that the component and the data contract are correct. | Make the action and data specific enough, and ensure a receiving filter matches them. |
| Security concern | Naming a component does not make it private; component exposure still matters. | An intent filter is not access control. A component may also be addressed explicitly. |
Android Developers recommends naming the component when you need to start a specific component in your app. See Intents and intent filters.
When should you use an explicit intent?
For known destinations in your app
If a button should open a particular activity in your app, name that activity directly. This makes the destination deterministic and avoids asking Android to search for a handler when your code already knows the recipient.
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When starting your own service
Use an explicit intent for a service. Android Developers warns that an implicit service start is a security hazard: you cannot be certain which service responds, and the user cannot see which service starts. An implicit intent passed to bindService() has thrown an exception since Android 5.0 (API level 21). See Interact with other apps.
What explicit targeting does not guarantee
An explicit intent targets the named component regardless of that component’s declared intent filters. Filters describe ways a component can receive implicit intents; they do not prevent another app from explicitly targeting an addressable, exposed component. Decide separately whether each component should be available outside your app.
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When should you use an implicit intent?
Use an implicit intent when the request is about an action rather than a component you control, and another installed app may be able to perform it. Sharing is a common example: your app can describe the content and let Android find suitable receiving apps. Android may present a chooser or other resolution UI when several components match. A chooser is useful when the user may prefer a different app for each handoff.
Android’s Common intents guide catalogs additional cross-app tasks. Use an implicit activity intent only when a suitable handler is genuinely optional; handle the case where none is installed.
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How does Android resolve an implicit intent?
Android compares an implicit intent’s resolution properties with intent filters declared by components. The main properties are the component name, action, data, and categories; extras are payload for the recipient and do not determine which component matches.
- Action: The operation requested, such as viewing or sharing.
- Data: A URI and/or MIME type. URI matching can involve the scheme, host, port, and path; MIME type also participates.
- Categories: Additional characteristics of the activity or request. The intent’s categories must be covered by the filter.
A mismatch in an applicable action, data, or category check means that filter does not match. If you need both a URI and a MIME type, use setDataAndType(). Android’s guide notes that setData() and setType() each clear the other value.
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Make filters reflect supported combinations
A filter that lists multiple actions, data types, or categories can allow combinations the component does not actually support. Use separate filters for distinct combinations, or ensure the component can correctly handle every combination the filter permits. Filters should describe real entry points, not serve as a broad substitute for validating incoming requests.
Include CATEGORY_DEFAULT for implicit activity starts
An activity intended to receive implicit starts through startActivity() or startActivityForResult() needs CATEGORY_DEFAULT in its filter. Without it, the filter will not be considered for those calls.
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How to choose and implement the right intent
- You know the exact component: Create an explicit intent naming it, for example
Intent(context, TargetActivity::class.java). - You want another app to handle an action: Create an implicit activity intent with the appropriate action and, when relevant, URI, MIME type, and categories. Use a chooser if the user should select among matching apps.
- You are starting or binding to a service: Specify the service component explicitly.
- You declare an intent filter: Confirm it matches the combinations your component supports, and include
CATEGORY_DEFAULTfor implicit activity starts. - You expose a component: Set its external availability deliberately. For components with intent filters, specify
android:exportedexplicitly. On Android 12 and later, an app with a filtered component that omits this value cannot be installed. Set it tofalsewhen external access is not wanted. - You launch an optional external activity: Catch
ActivityNotFoundExceptionso your app can respond if no installed component handles the request.
Common mistakes to avoid
- Using an implicit intent for an internal destination: If your code knows the target, name it rather than relying on resolution.
- Assuming a filter protects a component: Filters affect implicit matching; they are not an authorization boundary. Set
android:exportedintentionally. - Starting a service implicitly: Name the service component to avoid dispatching the request to an unintended service.
- Assuming extras influence resolution: Extras provide information to the recipient; they do not make a filter match.
- Declaring combinations the component cannot handle: Keep filter entries aligned with what the component actually supports.
- Ignoring the no-handler case: An implicit activity request can fail when no suitable app is installed; handle
ActivityNotFoundException.
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