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private void Start()    {        if (Application.platform == RuntimePlatform.Android)        {            OpenPackage("填写您要打开应用的包名！");        }    }    private void OpenPackage(string pkgName)    {        using (AndroidJavaClass jcPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))        {            using (AndroidJavaObject joActivity = jcPlayer.GetStatic
   
    ("currentActivity"))            {                using (AndroidJavaObject joPackageManager = joActivity.Call
    
     ("getPackageManager"))                {                    using (AndroidJavaObject joIntent = joPackageManager.Call
     
      ("getLaunchIntentForPackage", pkgName))                    {                        if (null != joIntent)                        {                            AndroidJavaObject joNIntent = joIntent.Call
      
       ("addFlags", joIntent.GetStatic
       
        ("FLAG_ACTIVITY_REORDER_TO_FRONT"));                            joActivity.Call("startActivity", joNIntent);                            joIntent.Dispose();                        }                        else                        {                            string msg = "Package <" + pkgName + "> not exsits on device.";                            Debug.Log(msg);                            using (AndroidJavaClass jT = new AndroidJavaClass("android.widget.Toast"))                            {                                using (AndroidJavaObject jMsg = new AndroidJavaObject("java.lang.String", msg))                                {                                    using (AndroidJavaObject jC = joActivity.Call
        
         ("getApplicationContext")) { int length = jT.GetStatic
         
          ("LENGTH_SHORT"); using (AndroidJavaObject toast = jT.CallStatic
          
           ("makeText", jC, jMsg, length)) { toast.Call("show"); } } } } } } } } } }
          
         
        
       
      
     
    
   

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