Flutter keyboard closes immediately

When developing a Flutter application, sometimes you may encounter the issue where the keyboard closes immediately after it opens. This can be quite frustrating for the users. There are a few possible reasons for this behavior.

1. Focus issue:

The first thing you need to check is whether the text field or input widget has the correct focus. When the keyboard pops up, it needs to have a proper input focus, otherwise it will close automatically. Make sure you use the FocusNode and Focus widget correctly to manage the focus. Here’s an example:

  
    FocusNode _focusNode = FocusNode();
    
    // Inside build method
    TextField(
      focusNode: _focusNode,
    ),
  
  

2. Auto-dismiss keyboard:

Another reason could be that you have some code that intentionally dismisses the keyboard. Check if you have any logic that calls the FocusNode’s unfocus method or executes a similar action that would dismiss the keyboard.

3. Keyboard behavior:

By default, the keyboard behavior is determined by the operating system. However, you can change the keyboard behavior by setting the textInputAction property of the TextField or TextFormField. For example, if you set it to TextInputAction.done, the keyboard will automatically close when the user presses the Done button. Here’s an example:

  
    TextField(
      textInputAction: TextInputAction.done,
    ),
  
  

4. Keyboard insets:

Flutter provides a MediaQuery widget that can be used to obtain the keyboard insets, which can help you adjust the layout accordingly. Sometimes, if you haven’t properly handled the keyboard insets, it may cause the keyboard to close immediately. Here’s an example of how you can handle the keyboard insets:

  
    MediaQuery(
      data: MediaQuery.of(context).copyWith(viewInsets: EdgeInsets.zero),
      child: Scaffold(
        // Your content here
      ),
    ),
  
  

By checking and addressing these possible causes, you should be able to resolve the issue of the Flutter keyboard closing immediately.