How to start an Android activity from a Unity Application?

Question

I know this seems to be a trivial question but I could not find any concrete answer anywhere on the internet. I saw this very similar question on stackoverflow: How to start Uni

Answer 1

I am not very familiar with Unity, but have a fair amount of Android experience. So take my answer as a suggestion rather than an authoritative answer.

Looking at the Launching an Android application from within Unity, you could try the following:

Follow the Guide on Integrating Unity with Eclipse.

Modify the Java file created in Step 1 as below:

package com.Unity3D.EclipseIntegration;

import android.os.Bundle;

import com.unity3d.player.UnityPlayerActivity;

public class EclipseIntegration extends UnityPlayerActivity {

    private Intent myIntent;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //Assuming that we want to launch the browser to browse a website
        Uri uri = Uri.parse("http://www.google.com");
        myIntent= new Intent(Intent.ACTION_VIEW, uri);
    }

    public void Launch()
    {       
        startActivity(myIntent);
    }
}

and modify your Unity code:

private void ExternalAppCallHandler()
{
    if(Application.platform == RuntimePlatform.WindowsEditor)
    {
        Process.Start(@"C:\Program Files (x86)\Notepad++\notepad++.exe");
    }
    else if(Application.platform == RuntimePlatform.Android)
    {
        AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        AndroidJavaObject jo = jc.GetStatic("currentActivity");
        jo.Call("Launch");
    }
}

In case you are facing any problems, please post the LogCat messages.