Why do we use dispose() method in dart code?

Question

Why are we using dispose() method? I'm little confused about it. what will be issue occurs If we don't use it and what's the benefit of using it?

@override   void dispose() {     // TODO: implement dispose     super.dispose();   } 

Answer 1

dispose method used to release the memory allocated to variables when state object is removed.

For example, if you are using a stream in your application then you have to release memory allocated to the stream controller. Otherwise, your app may get a warning from the PlayStore and AppStore about memory leakage.

Answer 2

dispose() method called automatically from stateful if not defined.

In some cases dispose is required for example in CameraPreview, Timer etc.. you have to close the stream.

When closing the stream is required you have to use it in dispose method.

dispose() is used to execute code when the screen is disposed. Equal to onDestroy() of Android.

Example:

@override void dispose() {   cameraController?.dispose();   timer.cancel();   super.dispose(); }