To create a more-standardized experience for detecting screenshots, Android 14 introduces a privacy-preserving screenshot detection API. This API lets apps register callbacks on a per-activity basis. These callbacks are invoked, and the user is notified, when the user takes a screenshot while that activity is visible.
Supported use cases
In Android 14, the system API only detects a screenshot if the user performs a specific combination of hardware button presses. The API doesn't detect screenshots that are taken when running test commands related to screenshots, including ADB, or within instrumentation tests that capture the device's current screen contents.
Implementation steps
To add screenshot detection, declare the new DETECT_SCREEN_CAPTURE
install-time permission:
<uses-permission android:name="android.permission.DETECT_SCREEN_CAPTURE" />
Then, complete these steps for each activity in your app where users might capture screenshots:
Implement a callback by overriding the
onScreenCapture()
function. In this callback, your app can take action, such as warning another user that someone took a screenshot of a messaging conversation.Kotlin
val screenCaptureCallback = Activity.ScreenCaptureCallback { // Add logic to take action in your app. }
Java
final Activity.ScreenCaptureCallback screenCaptureCallback = new Activity.ScreenCaptureCallback() { @Override public void onScreenCaptured() { // Add logic to take action in your app. } };
In the activity's
onStart()
method, register the screenshot callback.Kotlin
override fun onStart() { super.onStart() // Pass in the callback created in the previous step // and the intended callback executor (e.g. Activity's mainExecutor). registerScreenCaptureCallback(mainExecutor, screenCaptureCallback) }
Java
@Override protected void onStart() { super.onStart(); // Pass in the callback created in the previous step // and the intended callback executor (e.g. Activity's mainExecutor). registerScreenCaptureCallback(executor, screenCaptureCallback); }
In the activity's
onStop()
method, unregister the screenshot callback:Kotlin
override fun onStop() { super.onStop() unregisterScreenCaptureCallback(screenCaptureCallback) }
Java
@Override protected void onStop() { super.onStop(); unregisterScreenCaptureCallback(screenCaptureCallback); }
Control ability to capture screenshots
If you don't want the contents of an app's activity to appear in screenshots, or
on non-secure displays, set the FLAG_SECURE
display flag.
Kotlin
activity.getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE)
Java
activity.getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);