App manifest file. Device compatibility. Multiple APK support. Tablets, large screens, and foldables. Build responsive UIs. Build for foldables. Getting started. Handling data. User input. Watch Face Studio.
Health services. Creating watch faces. Android TV. Build TV Apps. Build TV playback apps. Help users find content on TV. Recommend TV content. Watch Next. Build TV games. Build TV input services. TV Accessibility. Android for Cars. Build media apps for cars.
Build navigation, parking, and charging apps for cars. Android Things. Supported hardware. Advanced setup. Build apps. Create a Things app. Communicate with wireless devices. Configure devices. Interact with peripherals. Build user-space drivers. Manage devices. Create a build. Push an update. Chrome OS devices. App architecture. Architecture Components. Wake locks allow your application to control the power state of the host device. Creating and holding wake locks can have a dramatic impact on the host device's battery life.
Thus you should use wake locks only when strictly necessary and hold them for as short a time as possible. For example, you should never need to use a wake lock in an activity. One legitimate case for using a wake lock might be a background service that needs to grab a wake lock to keep the CPU running to do work while the screen is off.
Again, though, this practice should be minimized because of its impact on battery life. If your app includes a broadcast receiver that uses a service to do some work, you can manage your wake lock through a WakefulBroadcastReceiver , as described in Use a broadcast receiver that keeps the deviceawake. This is the preferred approach. If your app doesn't follow that pattern, here is how you set a wake lock directly:.
To release the wake lock, call wakelock. This releases your claim to the CPU. It's important to release a wake lock as soon as your app is finished using it to avoid draining the battery. Using a broadcast receiver in conjunction with a service lets you manage the life cycle of a background task. A WakefulBroadcastReceiver passes off the work to a Service typically an IntentService , while ensuring that the device does not go back to sleep in the transition.
If you don't hold a wake lock while transitioning the work to a service, you are effectively allowing the device to go back to sleep before the work completes.
The net result is that the app might not finish doing the work until some arbitrary point in the future, which is not what you want. The first step in using a WakefulBroadcastReceiver is to add it to your manifest, as with any other broadcast receiver:.
This method is comparable to startService , except that the WakefulBroadcastReceiver is holding a wake lock when the service starts. The intent that is passed with startWakefulService holds an extra identifying the wake lock:. When the service is finished, it calls MyWakefulReceiver. The completeWakefulIntent method has as its parameter the same intent that was passed in from the WakefulBroadcastReceiver :.
Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Resource types. App manifest file. Device compatibility.
Multiple APK support. Tablets, large screens, and foldables. Build responsive UIs. Build for foldables. Getting started. Handling data. User input. Watch Face Studio. Health services. Creating watch faces. Android TV. Build TV Apps. Build TV playback apps.
Help users find content on TV. You downloaded an image last week but accidentally erased it from your device. To recover that image, open Chrome, tap the three-dotted menu icon at the top right corner, then tap Downloads to see your list of downloads from the browser. The new and much-improved Microsoft Edge browser is slowly making inroads on Android, and makes it relatively easy to find your downloads. Firefox makes it just as easy to find your downloads.
Once you have the browser open, tap on the three vertical dots at the top-right or bottom-right, depending on your personal setup of your display. To dig a little deeper still into your Android directories, you should read our guide on how to install TWRP Recovery.
By signing up, you agree to our Privacy Policy and European users agree to the data transfer policy. Crystal Crowder has spent over 15 years working in the tech industry, first as an IT technician and then as a writer. She works to help teach others how to get the most from their devices, systems, and apps.
She stays on top of the latest trends and is always finding solutions to common tech problems. You've decided to leave a comment. Best Roku TV. Best Apple Watch. Best iPad Cases. Best Portable Monitors. Best Gaming Keyboards. Best Drones. Best 4K TVs. Best iPhone 13 Cases. Best Tech Gifts for Kids Aged Awesome PC Accessories. Best Linux Laptops. Best Bluetooth Trackers. Best eReaders. Best Gaming Monitors. Practice For beginners struggling with negative thoughts, to advanced meditators who have glimpsed the illusion of the self, Waking Up will meet you where you are.
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