Package io.flutter.view

Interface TextureRegistry.SurfaceProducer.Callback

Enclosing interface:
TextureRegistry.SurfaceProducer
public static interface TextureRegistry.SurfaceProducer.Callback
Callback invoked by TextureRegistry.SurfaceProducer.setCallback(Callback).

  • Method Details

    • onSurfaceCreated

      @Deprecated(since="Flutter 3.27", forRemoval=true) default void onSurfaceCreated()
      Deprecated, for removal: This API element is subject to removal in a future version.
      Override and use onSurfaceAvailable() instead.
      An alias for onSurfaceAvailable() with a less accurate name.

    • onSurfaceAvailable

      default void onSurfaceAvailable()
      Invoked when an Android application is resumed after onSurfaceDestroyed().

      Applications should now call TextureRegistry.SurfaceProducer.getSurface() to get a new Surface, as the previous one was destroyed and released as a result of a low memory event from the Android OS. 

       
 void example(SurfaceProducer producer) {
   producer.setCallback(new SurfaceProducer.Callback() {
     @override
     public void onSurfaceAvailable() {
       Surface surface = producer.getSurface();
       redrawOrUse(surface);
     }

     // ...
   });
 }

    • onSurfaceDestroyed

      void onSurfaceDestroyed()
      Invoked when a Surface returned by TextureRegistry.SurfaceProducer.getSurface() is invalid.

      In a low memory environment, the Android OS will signal to Flutter to release resources, such as surfaces, that are not currently in use, such as when the application is in the background, and this method is subsequently called to notify a plugin author to stop using or rendering to the last surface.

      Use onSurfaceAvailable() to be notified to resume rendering. 

       
 void example(SurfaceProducer producer) {
   producer.setCallback(new SurfaceProducer.Callback() {
     @override
     public void onSurfaceDestroyed() {
       // Store information about the last frame, if necessary.
       // Potentially release other dependent resources.
     }

     // ...
   });
 }