How to get Android soft keyboard height?

Question

I know I can use "android:windowSoftInputMode="adjustPan" to do some automatically offset. But I really want to get software keyboard height for some special purpose.

I got to find that there's a similar topic here: Getting the dimensions of the soft keyboard. But obviously, it's not an universal solution.

Is there a common way or built-in method to get soft keyboard height? (or how can I get the offset value between current cursor position and software keyboard top position?)

Thanks so much

Answer 1

Get Soft Keyboard Height in Xamarin.Android, use ViewTreeObserver.IOnGlobalLayoutListener to listen for GlobalLayout Change event and calculate the change difference in root view before and after in order to get the height of keyboard. You can do similar in Native Android Code.

here is the code:

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
{
        public static Android.Views.View RootView = null;
        public void DetectSoftKeyboardHeight()
        {
            RootView = this.FindViewById(Android.Resource.Id.Content);
            if(RootView!=null)
                RootView.ViewTreeObserver.AddOnGlobalLayoutListener(new MyLayoutListener());
        }
}
/// <summary>
/// My layout listener.
/// Detect Android Soft keyboard height
/// </summary>
public class MyLayoutListener : Java.Lang.Object, ViewTreeObserver.IOnGlobalLayoutListener
{
    public void OnGlobalLayout()
    {
        // do stuff here
        Android.Graphics.Rect r = new Android.Graphics.Rect();
        if (Mobibranch.Droid.MainActivity.RootView != null)
        {
            Mobibranch.Droid.MainActivity.RootView.GetWindowVisibleDisplayFrame(r);

            int screenHeight = Mobibranch.Droid.MainActivity.RootView.RootView.Height;
            int keyboardHeight = screenHeight - (r.Bottom);

            if (keyboardHeight > 0)
            {
                //Keyboard is up on screen
                Android.Util.Log.Verbose("[[[[MyLayoutListener]]]]", "Keyboard is up on screen, Height: "+keyboardHeight);
            }
            else
            {
                //Keyboard is hidden
            }
        }
    }
}