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An Android intent is a message that asks an app component to do something. An explicit intent names its destination; an implicit intent describes the requested work and lets Android find a component that can handle it. Understanding the action, data, extras, categories, and matching filter helps you route requests correctly—and avoid treating a filter as a security boundary.
What is an Android intent?
An intent is a message object Android uses to activate an activity, service, or broadcast receiver. Apps use intents to communicate between their own components and, when appropriate, with components in other apps. Android can resolve an implicit intent to a suitable handler; if several activities qualify, it may show a chooser or resolution dialog. See Android Developers’ guide to intents and intent filters.
What are intent actions, data, and extras?
An intent can describe the requested operation, the resource it concerns, and additional inputs. These fields serve different purposes and should be chosen to fit the operation.
- Action: Names the kind of operation, often using a predefined action constant in code. In a manifest filter, the matching action is written as a literal string, such as
android.intent.action.SEND. - Data: Identifies the object or resource involved. Depending on the request, this can be a URI, a MIME type, or both. A filter can constrain URI scheme, host, port, path, and MIME type.
- Extras: Carry additional key-value inputs for the receiving component. For example, alarm-related intents can carry the hour, minute, and a message. Extras provide parameters; they do not determine whether an implicit intent matches a filter.
- Category: Adds information about the kind of component that may handle the request. For common activity launches with
startActivity(), a matching filter must includeandroid.intent.category.DEFAULT.
Android’s documentation describes how action, data, and category participate in filter matching, while its common intents guide shows practical actions and extras.
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Yojaro 4Pack Silicone Suction Phone Case Mount, Silicon Adhesive Smartphones Stand Sticky, Hands-Free Phone Accessories Holder for Selfies and Videos (Black & White & Translucent & Light Pink)
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How do Android intent filters work?
An intent filter is declared inside a component’s manifest entry, such as an <activity>. It advertises which implicit intents that component is prepared to handle. Android checks the incoming intent against the filter’s action, data, and categories; the relevant tests must match. A component may declare multiple filters, and each filter is a separate declaration of supported requests.
For example, an activity that advertises receiving plain-text shares can declare a filter with action android.intent.action.SEND, category android.intent.category.DEFAULT, and MIME type text/plain. This tells Android that the activity is a candidate for that kind of request. It does not ensure that the activity’s code can safely handle every value another app supplies.
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- SUPERIOR COMFORT — Unlike traditional circular ear buds, the design of EarPods is defined by the geometry of the ear. Which makes them more comfortable for more people than any other ear bud–style headphones.
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Use separate filters when a component supports distinct jobs or when action-and-data combinations should not be treated as interchangeable. For exact matching behavior and manifest examples, see Android’s intent and filter documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the difference between explicit and implicit intents?
| Question | Explicit intent | Implicit intent |
|---|---|---|
| How is the destination chosen? | The intent names a component. | The intent describes the work; Android searches for a matching component. |
| Does Android resolve across apps? | No component search is needed for the named destination. An explicit intent can also constrain an otherwise implicit request to a package. | Yes. Android matches the request against available components’ filters. |
| Can the user choose a handler? | Typically not through handler resolution. | Android may offer a chooser or resolution dialog when multiple activities match. |
| What is the privacy consideration? | Routing is more controlled when the component or package is known. | Any compatible app may be a candidate, so do not expose data unless that exposure is acceptable. |
Use an implicit intent when the user should be able to choose an app for a task such as opening a map or sharing content. Use an explicit destination or package restriction when the target is known or the data is sensitive. Filters do not change the fact that intent contents should be appropriate for their possible recipients.
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Anteel 2 Pack Silicone Suction Cup Phone Case Mount Double Sided, Hands-Free Silicon Phone Grip with Higher Suction Power for Selfies and Videos, Non Slip Phone Accessories (LightPink&White)
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How to send an implicit intent safely
- Choose the operation. Set the action that represents what the recipient should do.
- Describe the content. Set the URI, MIME type, or both as required by the action and expected filter.
- Add required inputs. Put action-specific parameters in extras, and do not put secrets in an implicit request unless disclosure to a matching app is acceptable.
- Check for a handler. Before calling
startActivity(), checkresolveActivity()when no matching app may be installed. If no handler exists, show an appropriate message or provide another supported path instead of allowing the launch to fail unexpectedly. Android’s common intents guide covers this missing-handler check.
Intent security and compatibility pitfalls
- A filter is not access control. Another app can explicitly start a component if that component is exported and its name is known. Use
android:exportedintentionally, keep internal components private, and validate the action, URI, extras, and any nested intent when handling a request. See Android’s security tips. - Implicit requests can be intercepted. Another app may register a matching filter and receive an implicit intent. Avoid putting tokens or other sensitive or mutable data in a broadly routed request. Where implicit routing is required, restrict the recipient appropriately when possible. Android explains the risk and mitigations in its implicit intent hijacking guidance.
- Target services deliberately. Use explicit intents for services: an implicit service intent can start an unintended service. Implicit
bindService()has thrown since Android 5.0 (API level 21). See Android’s security tips. - Declare exported status for filtered components. For apps targeting Android 12 or later, a component with an intent filter must explicitly declare
android:exported; otherwise, Android will not install the app. The launcher activity generally needs to be accessible, while components intended only for internal use should remain private. See Android’s intent and filter guide.
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