unity程序里调用安卓APP

unity程序里调用其他安卓APP（打开第三方应用 ）如打开微信

 public void OpenWXApp()
        {
            try //如果手机上安装了微信，就打开微信的主界面
            {
                PackageManager packageManager = getPackageManager();   
                Intent intent=new Intent();   
                intent = packageManager.getLaunchIntentForPackage("com.tencent.mm"); //填写微信包名 
                startActivity(intent);
            } 
            catch (Exception e)//如果没有安装就打开一个浏览器去下载
            {
                e.printStackTrace();  
                Intent viewIntent = new  
                Intent("android.intent.action.VIEW",Uri.parse("http://weixin.qq.com/"));  
                startActivity(viewIntent);          
            }
        }