How to resize view when touchscreen keyboard is visible on Android with Unity?

Question

In Unity I can't control the touchscreen keyboard. TouchScreenKeyboard class has only one parameters for Android.

if(TouchScreenKeyboard.visible)
{ float keyboardHeight = TouchScreenKeyboard.area.height;
  // will resize the view here! But this return zero!
}

Is there any other way to know the height of the keyboard on Android ?

Answer 1

This should do the trick (found here):

    public int GetKeyboardSize()
    {
        using(AndroidJavaClass UnityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
        {
            AndroidJavaObject View = UnityClass.GetStatic<AndroidJavaObject>("currentActivity").Get<AndroidJavaObject>("mUnityPlayer").Call<AndroidJavaObject>("getView");

            using(AndroidJavaObject Rct = new AndroidJavaObject("android.graphics.Rect"))
            {
                View.Call("getWindowVisibleDisplayFrame", Rct);

                return Screen.height - Rct.Call<int>("height");
            }
        }
    }

Answer 2

It was long ago, but just in case anybody is struggling with it again, I managed to find a solution for a panel with an InputField using this MonoBehaviour class. I attached it to the InputField and linked the panel which should be resized.

public class InputFieldForScreenKeyboardPanelAdjuster : MonoBehaviour {

    // Assign panel here in order to adjust its height when TouchScreenKeyboard is shown
    public GameObject panel;

    private InputField inputField;
    private RectTransform panelRectTrans;
    private Vector2 panelOffsetMinOriginal;
    private float panelHeightOriginal;
    private float currentKeyboardHeightRatio;

    public void Start() {
        inputField = transform.GetComponent<InputField>();
        panelRectTrans = panel.GetComponent<RectTransform>();
        panelOffsetMinOriginal = panelRectTrans.offsetMin;
        panelHeightOriginal = panelRectTrans.rect.height;
    }

    public void LateUpdate () {
        if (inputField.isFocused) {
            float newKeyboardHeightRatio = GetKeyboardHeightRatio();
            if (currentKeyboardHeightRatio != newKeyboardHeightRatio) {
                Debug.Log("InputFieldForScreenKeyboardPanelAdjuster: Adjust to keyboard height ratio: " + newKeyboardHeightRatio);
                currentKeyboardHeightRatio = newKeyboardHeightRatio;
                panelRectTrans.offsetMin = new Vector2(panelOffsetMinOriginal.x, panelHeightOriginal * currentKeyboardHeightRatio);
            }
        } else if (currentKeyboardHeightRatio != 0f) {
            if (panelRectTrans.offsetMin != panelOffsetMinOriginal) {
                SmartCoroutine.DelayedExecute(this, () => {
                    Debug.Log("InputFieldForScreenKeyboardPanelAdjuster: Revert to original");
                    panelRectTrans.offsetMin = panelOffsetMinOriginal;
                }, 0.5f);
            }
            currentKeyboardHeightRatio = 0f;
        }
    }

    private float GetKeyboardHeightRatio() {
        if (Application.isEditor) {
            return 0.4f; // fake TouchScreenKeyboard height ratio for debug in editor        
        }

#if UNITY_ANDROID        
        using (AndroidJavaClass UnityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer")) {
            AndroidJavaObject View = UnityClass.GetStatic<AndroidJavaObject>("currentActivity").Get<AndroidJavaObject>("mUnityPlayer").Call<AndroidJavaObject>("getView");
            using (AndroidJavaObject rect = new AndroidJavaObject("android.graphics.Rect")) {
                View.Call("getWindowVisibleDisplayFrame", rect);
                return (float)(Screen.height - rect.Call<int>("height")) / Screen.height;
            }
        }
#else
        return (float)TouchScreenKeyboard.area.height / Screen.height;
#endif
    }

}