Free tools Windows power users keep installed
One-click scans. No signup required.
An Android Activity moves through lifecycle callbacks as it becomes visible, interactive, obscured, stopped, recreated, or finished. The key sequence is onCreate(), onStart(), and onResume() as it enters use; then onPause() and onStop() as it loses focus and visibility. onDestroy() may end that instance, while onRestart() precedes the return of an Activity that was stopped. These callbacks describe transitions—not a promise that Android will keep the Activity or its process alive.
What is the Android Activity lifecycle?
An Activity is one app component that typically represents a screen. Android calls lifecycle methods to notify it about changes in its visibility and ability to interact with the user. Use those notifications to set up the screen, pause foreground-only behavior, and release resources at the appropriate time.
The callbacks are not a continuous record of everything that happens to the app. In particular, Android does not destroy an individual Activity as a way to reclaim memory: it may kill the app process, which removes its in-memory objects without giving every component a final callback. Android describes this distinction in its Activity lifecycle guide and process lifecycle documentation.
What happens at each lifecycle callback?
| Callback | When it runs | Typical use |
|---|---|---|
onCreate() |
When Android creates a new Activity instance. | Set up the UI and initialize essential instance components. A saved-state bundle may be available for restoration. |
onStart() |
When the Activity is becoming visible. | Prepare work needed while the screen is visible. |
onResume() |
When the Activity enters the foreground and can interact with the user. | Start or resume behavior that requires foreground interaction. |
onPause() |
When the Activity loses foreground focus, for example as another Activity comes forward. | Briefly pause or release foreground-only behavior. Avoid slow or blocking work. |
onStop() |
When the Activity is no longer visible. | Stop work that only makes sense while the screen is visible; it can also be a fallback point for saving important changes. |
onRestart() |
When a stopped Activity instance is returning. | Prepare for visibility again; Android then calls onStart() and, if foregrounded, onResume(). |
onDestroy() |
When this instance is finishing or being destroyed for a recreation. | Release remaining instance-specific resources. Do not rely on it as a guaranteed save callback. |
How do the callbacks fit together?
Launching an Activity
A newly launched Activity typically receives onCreate(), then onStart(), then onResume(). At that point it is visible and ready for user interaction.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11#1 Best Overall
- 【Strong Adsorption】The inspiration of the silicone phone suction case comes from the adhesive force of the octopus. Each suction cup phone mount is 3.15 inches long and 2.17 inches wide, with 24 independent suction cups providing a stronger and more stable suction force, so you don't have to worry about your phone falling during use.
- 【Back of Phone Suction Grip】Remove the adhesive film on the phone suction cup and stick it on the phone case. You can then fix the phone on any smooth surface, which is very convenient. (The phone suction cup cannot be removed and reused after being attached to the phone case. It is recommended to attach it to a regular phone case, not a valuable one.)
- 【Widely Used】Our non-slip silicone phone sticky grip mount attaches to almost any flat phone case and make it compatible with common mobile phones such as iPhone and Android.You can shoot, watch videos or video calls in the kitchen, gym, dance studio, bathroom and other places.
- 【Capture the Wonderful Picture】Whether you are a TikTok creator or just like to share videos and photos, this phone suction cup can help you hands-free capture wonderful videos and photos for sharing with friends.
- 【Note】You can fix the phone suction cup on a smooth surface such as a mirror or glass. If necessary, wipe the suction cup with a damp cloth to obtain stronger suction. Before releasing your hand, make sure the phone is firmly fixed. (Not applicable to rough walls, wooden surfaces, and other uneven surfaces)
Opening another Activity
When Activity A starts Activity B in the same process, A pauses while B is brought forward. B receives its creation, start, and resume callbacks; A then stops if it is no longer visible. The precise sequence can vary with what remains visible, so treat callbacks as state transitions rather than a fixed script for every screen arrangement.
Returning to a stopped Activity
If the same stopped instance becomes visible again, it receives onRestart(), followed by onStart() and onResume(). If Android instead destroyed the instance, returning requires a new instance and starts again at onCreate().
Rank #2
- 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.
- HIGH-QUALITY AUDIO — The speakers inside EarPods have been engineered to maximize sound output and minimize sound loss, which means you get high-quality audio.
- BUILT-IN REMOTE — EarPods with USB-C plug also include a built-in remote that lets you adjust the volume, control the playback of music and video, and answer or end calls with a pinch of the cord.
- COMPATIBILITY — Works with all devices that have a USB-C port.
- INTEGRATED MICROPHONE — A built-in microphone precisely captures your voice while you’re on the phone, taking a FaceTime call, or summoning Siri — so you’re always heard loud and clear.
Finishing or losing the process
Finishing an Activity can lead to onPause(), onStop(), and onDestroy(). But process death is different: Android may terminate a background app process to reclaim memory, and the process’s in-memory objects disappear. The system does not promise an onDestroy() call before that happens. Save data according to its importance and lifetime, not on the assumption that a final callback will run.
What happens during rotation or another configuration change?
By default, a configuration change such as rotation can destroy the current Activity instance and create another. The old instance typically receives onPause(), onStop(), and onDestroy(); the new instance receives onCreate(), onStart(), and onResume(). A field stored only on the old instance does not automatically carry over. Android’s Activity state changes guide explains the transition and restoration options.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsRank #3
- Secure Hold: Our PopSockets adhesive phone grip gives your cell phone a secure, comfortable hold in hand to help prevent drops while texting, taking photos, or scrolling on the go. Designed to stick firmly to most phone cases and devices.
- Hands-Free Made Easy: Easily turn your PopSocket into a phone stand to prop up your phone anywhere, perfect for watching videos, video calls, or following recipes. A must-have phone holder that keeps your device secure and ready for anything.
- Compatibility: Works with all phones, tablets, and Kindles. Sticks best to smooth, hard plastic cases and may not adhere to silicone or textured cases. Easily swap your PopTop to change up your style.
- Black PopSockets: Simple, refined, and endlessly versatile. A timeless essential for any phone.
- Travel Must-Have for People On the Go: A must-have travel accessory for flights, flying, airports, air travel, airplanes, planes, international trips, cruises, and long travel days. Key gadget for your airport haul, travel accessories and must-haves.
Multi-window changes and resizing can also trigger configuration changes and recreation unless the app handles the changes itself. The behavior depends on the app’s configuration and manifest choices, so the default sequence should not be treated as universal.
Where should Activity state be stored?
Choose storage based on how long the information must last and how much data it contains. Android’s Activity API reference describes saved instance state; its state-change guidance compares restoration approaches.
Rank #4
- [360 ° Flexible Rotation Design] Comes with a rotatable lanyard ring that supports 360 ° free rotation, effectively solving the problem of twisted and tangled lanyards
- [Wide compatibility] The ultra-thin 0.02-inch design does not block the charging port at all, and both wired and wireless charging can be used directly without removing the pad. Compatible with most smartphones such as iPhone, compatible with various wristbands, lanyards, crossbody straps, and keychains
- [Durable and Portable Material] Premium rust-resistant stainless steel material with good flexibility, which not only avoids scratching the phone case, but also has excellent anti rust and anti fading performance
- [Multi scenario Practical] Paired with a lanyard or wristband, hands-free use can be achieved. The phone is within reach and not easily dropped, ideal for daily commuting and outdoor activities. Suitable for full coverage phone cases, does not support half coverage phone cases
- [Quality Service] If you find any damage or other issues with the product upon receipt, please contact us immediately. We will handle it quickly
| Approach | Best fit | Lifetime and limits |
|---|---|---|
Saved instance state or Compose rememberSaveable |
Small, temporary UI details such as text input or scroll position. | Can restore state after Activity recreation and supported system-initiated process death. Keep it small: saved state is serialized on the main thread and uses process memory. |
ViewModel |
Screen state and business logic that should remain available across configuration recreation. | Retained in memory through configuration recreation, but does not by itself make arbitrary data durable through process death. Add saved-state support or persistent storage when that restoration is needed. |
| Persistent local storage | User data that should outlive a screen or process, such as saved drafts or preferences. | Designed for durable data. Save at an appropriate point during the user’s work rather than waiting for Activity destruction. |
What work belongs in lifecycle callbacks?
Keep callbacks short and focused on the transition they represent. In particular, Android says not to use onPause() to save application or user data, make network calls, or execute database transactions. A slow operation there can delay the next Activity from appearing. Save important information earlier when practical; use onStop() only as a suitable fallback rather than treating destruction as a persistence strategy. See Android’s Introduction to activities.
For Jetpack Compose, use lifecycle-aware collection such as collectAsStateWithLifecycle for Flows and lifecycle effects for work tied to lifecycle events. Avoid placing business logic or manual observer setup directly in Activity callbacks such as onStart() and onResume(); Android’s lifecycle guide covers Compose-specific guidance.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Quick Recap
Best Value
- 【PKYAA Double Sided Silicone Suction Phone Case Mount】PKYAA With Double Sided 40 Strong and Reliable individual suction cups, PKYAA provides a thicken and upgraded universal silicon suction mount for your phone.
- 【Friendly to Content Creators】If you are a content creator or an online influencer, you can create videos anywhere with this suction mount completely hands free with this silicone cell phone mount for cases.
- 【HANDS-FREE & Adhere to Mirrors】This Double Sided silicone suction phone case mount allows you to stick your phone to the mirror easily. No longer holding your phone in one hand to watch video tutorials while making up.
- 【Strong Grip on the Smooth Surface】You can easily hang your phone anywhere with a smooth surface. All you do is you clean off your phone and smooth surface. It is STURDY and it not only sticks to mirrors, it also sticks to windows, it sticks to refrigerators, tiles and other clean, flat surfaces.
- 【Press Down Firmly Every 30 Minutes】Use your palm or fingers to press the phone down firmly and check it's secure before letting go. Apply even pressure for a few seconds to allow the suction cup to adhere properly. To maintain the grip and prevent accidental falls, it's a good practice to periodically reapply pressure to the suction cup.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
