FocusChange After Opening Keyboard

Question

As we know, the keyboard is usually displayed when an EditText receives focus or is tapped. This is what I want, however, I have a layout change that I need to do AFTER the keyboard is opened (because it depends on the available space). But because FocusChange is called before the keyboard is displayed, I need a way to detect when the keyboard has been opened. I thought about using the LayoutChange event, but that would make it much harder to do some of the things I do in FocusChange, not to mention it would probably end up getting triggered at undesired times. Is there a way to detect when the keyboard has finished opening?

Answer 1

Hello njsokalski,​

Welcome to our Microsoft Q&A platform!

To check whether the keyboard is open, try adding OnLayoutChangeListener for the root layout of the Activity. If the height of the Activity pushed up exceeds 1/3 of the screen height, we can conside the soft keyboard has popped up.

Here is the sample code, you could refer to it.

   public class TestActivity : AppCompatActivity, View.IOnLayoutChangeListener  
   {  
       protected override void OnCreate(Bundle savedInstanceState)  
       {  
           ...  
     
           var layout = FindViewById<RelativeLayout>(Resource.Id.root);  
           keyHeight = this.WindowManager.DefaultDisplay.Height / 3;  
           layout.AddOnLayoutChangeListener(this);  
       }  
     
       int keyHeight = 0;  
       public void OnLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom)  
       {  
           //If the height of the activity pushed up exceeds 1/3 of the screen height, the soft keyboard can be considered to be up  
           if (oldBottom != 0 && bottom != 0 && (oldBottom - bottom > keyHeight))  
           {  
               //the keyboard is open  
           }  
           else if (oldBottom != 0 && bottom != 0 && (bottom - oldBottom > keyHeight))  
           {  
               //the keyboard is closed  
           }  
       }  
   }  

Best Regards,

Jarvan Zhang

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