activitystartActivityintent

activitystartActivityintent refers to the common Android programming pattern used to launch a new Activity component from another Activity by creating and passing an Intent object. An Intent encapsulates an action, data, and optional extras that describe the target operation. The startActivity(Intent) method on the Activity class initiates the activity transition based on the intent’s resolution. When startActivity(intent) is called, the Android runtime searches for an Activity that can handle the intent’s action and data according to the manifest declarations. If multiple activities match, a chooser dialog may be displayed unless the intent specifies a particular component.

Typical usage involves constructing an Intent with a context and the target class, optionally adding flags such as FLAG_ACTIVITY_NEW_TASK, and attaching data via putExtra. For example:

Intent intent = new Intent(this, DetailActivity.class);

intent.putExtra("item_id", 42);

startActivity(intent);

This pattern supports both explicit intents (specifying a component) and implicit intents (specifying only an action and data). Implicit intents are resolved by the system’s intent filter mechanism. The startActivityForResult(Intent, int) variant allows the initiating activity to receive a result callback in onActivityResult. Starting from AndroidX, the Activity Result APIs replace startActivityForResult to provide a type‑safe and lifecycle‑aware approach.

Developers must consider request codes, intent flags, and permission requirements to ensure proper navigation flow and security. The method is foundational for inter‑component communication in Android applications.