Launch an app from within another app

Question

Hi, I'm triying to launch an already inastalled Adroid/iOS app from within another app; I searched far and wide and tried all known ways like:

 // package = apk name
 
 public void RunApk(string package){ 
         string filepath = "";
 
         #if UNITY_EDITOR
             filepath = Application.dataPath  + string.Format("/StreamingAssets/{0}", package);
         #else
             filepath = Application.persistentDataPath + "/" + package;
             if (!File.Exists(filepath)) {
                   WWW loadAPK = new WWW("jar:file://" + Application.dataPath + "!/assets/" + package);
                   while (!loadAPK.isDone) {}
                   File.WriteAllBytes(filepath, loadAPK.bytes);
             }
         #endif
 
         ProcessStartInfo startInfo = new ProcessStartInfo();
         startInfo.FileName = filepath;
         Process.Start(startInfo);

Someone has an idea?

Thank you.

Giusort

Answer 1

Hey @Giusort , I can offer you a way to do it in Android but you will still need to find a way to do it in iOS. You can wrap it up in Platform Dependent Compilation like #if UNITY_ANDROID and use that way.

Try this:

 public void LaunchApp(string package, string storeLink = null)
     {
         bool fail = false;
         string bundleId = package; // your target bundle id
         AndroidJavaClass up = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
         AndroidJavaObject ca = up.GetStatic<AndroidJavaObject>("currentActivity");
         AndroidJavaObject packageManager = ca.Call<AndroidJavaObject>("getPackageManager");
 
         AndroidJavaObject launchIntent = null;
         try
         {
             launchIntent = packageManager.Call<AndroidJavaObject>("getLaunchIntentForPackage", bundleId);
         }
         catch (System.Exception e)
         {
             fail = true;
         }
 
         if (fail && storeLink != null)
         { //open app in store
             Application.OpenURL(storeLink);
         }
         else //open the app
             ca.Call("startActivity", launchIntent);
 
         up.Dispose();
         ca.Dispose();
         packageManager.Dispose();
         launchIntent.Dispose();
     }

package is bundleIdentifier of app, such as "com.facebook.katana" and optional parameter is the store link of the app in case the app is not found in device, you can leave it as null and it will only try to open the app if it exists.

Launch an app from within another app

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