How to pass message from OnMessageReceivedFromIonic() to other classes

[jakeeind]

I try to passing string message to another class like this

IonicComms.cs

public string MessageFromIonic { get; private set; }
....
....
private void OnMessageReceivedFromIonic( string message )
    {
        if (string.IsNullOrEmpty(message))
            message = "no message from ionic";

        // Process message here
        MessageFromIonic = message;
       }

controller.cs

public class controller: MonoBehaviour
{
    IonicComms ionic = new IonicComms();
    public Text unity_text;

    // Start is called before the first frame update
    void Start()
    {
        unity_text.text = ionic.MessageFromIonic;
    }

    // Update is called once per frame
    void Update()
    {

    }
}

but the message still not show in UI

[yasirkula]

Probably controller.Start is called before IonicComms.OnMessageReceivedFromIonic is called. Try adding a 1-frame delay to controller.Start like this:

IEnumerator Start()
{
    yield return null;
    unity_text.text = ionic.MessageFromIonic;
}

Alternatively, you can give IonicComms a negative order in Edit-Project Settings-Script Execution Order.

[jakeeind]

still can't pass the message :(

IonicComms.cs

using System.IO;
using UnityEngine;
using UnityEngine.UI;

public class IonicComms: MonoBehaviour
{

    private static IonicComms Instance = null;

#if !UNITY_EDITOR && UNITY_IOS
    [System.Runtime.InteropServices.DllImport( "__Internal" )]
    private static extern void uHideUnity();

    [System.Runtime.InteropServices.DllImport( "__Internal" )]
    private static extern void uNotifyUnityReady();

    [System.Runtime.InteropServices.DllImport( "__Internal" )]
    private static extern void uSendMessageToIonic( string message );

    [System.Runtime.InteropServices.DllImport( "__Internal" )]
    private static extern void uSendResultToIonic( string result );
#endif
    public Text ionic_text;
    public string MessageFromIonic { get; private set; }
    [RuntimeInitializeOnLoadMethod( RuntimeInitializeLoadType.AfterSceneLoad )]
    static void Init()
    {
        if ( Instance == null )
        {
            Instance = new GameObject( "IonicComms" ).AddComponent<IonicComms>();
            DontDestroyOnLoad( Instance.gameObject );
        }
    }

    void Awake()
    {
        if( Instance == null )
        {
            Instance = this;

            gameObject.name = "IonicComms";
            DontDestroyOnLoad( gameObject );
        }
        else if( this != Instance )
            Destroy( this );
    }

    void Start()
    {
        ionic_text.text = "hello ionic";
        MessageFromIonic = "no message from ionic";
        if ( Instance != this )
            return;

    #if !UNITY_EDITOR && UNITY_ANDROID
            using( AndroidJavaClass activityClass = new AndroidJavaClass( "com.unity3d.player.UnityPlayer" ) )
            using( AndroidJavaObject activity = activityClass.GetStatic<AndroidJavaObject>( "currentActivity" ) )
            {
                string data = activity.Get<string>( "commStr" );
                OnMessageReceivedFromIonic( data );
            }
    #elif !UNITY_EDITOR && UNITY_IOS
            uNotifyUnityReady();
    #endif
    }

    private void OnMessageReceivedFromIonic( string message )
    {
        if (string.IsNullOrEmpty(message))
            message = "no message from ionic";

        // Process message here
        MessageFromIonic = message;

    }

    public static void SendMessageToIonic( string message )
    {
        if( message == null || message.Length == 0 )
            return;

#if !UNITY_EDITOR && UNITY_ANDROID
        using( AndroidJavaClass activityClass = new AndroidJavaClass( "com.unity3d.player.UnityPlayer" ) )
        using( AndroidJavaObject activity = activityClass.GetStatic<AndroidJavaObject>( "currentActivity" ) )
        {
            activity.Call( "sendMessageToIonic", message );
        }
#elif !UNITY_EDITOR && UNITY_IOS
        uSendMessageToIonic( message );
#endif
    }

    public static void FinishActivity( string returnMessage = null )
    {
    #if UNITY_EDITOR
            UnityEditor.EditorApplication.isPlaying = false;
            return;
    #endif

        if (returnMessage == null)
            returnMessage = "";

        if( Instance == null )
        {
            Application.Quit();
        }
        else
        {
    #if UNITY_EDITOR
    #elif UNITY_ANDROID
                using( AndroidJavaClass activityClass = new AndroidJavaClass( "com.unity3d.player.UnityPlayer" ) )
                using( AndroidJavaObject activity = activityClass.GetStatic<AndroidJavaObject>( "currentActivity" ) )
                {
                    activity.Set<string>( "commStr", returnMessage );
                    activity.Call( "closeApp" );
                }
    #elif UNITY_IOS
                uSendResultToIonic( returnMessage );            
                uHideUnity();
    #else
                Application.Quit();
    #endif
        }
    }
}

controller.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class controller: MonoBehaviour
{
    IonicComms ionic = new IonicComms();
    public Text unity_text;

    // Start is called before the first frame update
    IEnumerator Start()
    {
        yield return null;
        unity_text.text = ionic.MessageFromIonic;
    }

    // Update is called once per frame
    void Update()
    {
        unity_text.text = ionic.MessageFromIonic;
    }
}

and I try an alternative way that you suggest

still not work

[yasirkula]

Simply make MessageFromIonic public static and access it like this: unity_text.text = IonicComms.MessageFromIonic;. Don't create a new IonicComms instance with new IonicComms().

[jakeeind]

I can do it now! Thank you so much