使用NJS的 startActivity 只有安装后的第一次启动有效，以后都无效，main.startActivity(intent); 打印不出来任何东西

var main = plus.android.runtimeMainActivity();
console.log(main);
nwv = plus.android.currentWebview();
console.log(nwv);
// plus.android.importClass("android.support.v7.app.AppCompatActivity");
plus.android.importClass("android.app.Activity");
var Bundle = plus.android.importClass("android.os.Bundle");
var Intent = plus.android.importClass("android.content.Intent");

            var intent = new Intent(main.getIntent());  
            var bundle =  new Bundle();  
            bundle.putString("TYPE", "MpsVid");  
            bundle.putString("MediaId", MediaId);  
            bundle.putString("AccessKeyId", AccessKeyId);  
            bundle.putString("AccessKeySecret", AccessKeySecret);  
            bundle.putString("SecurityToken", SecurityToken);  
            bundle.putString("Expiration", Expiration);  
            intent.putExtras(bundle);  
            intent.setClassName(main,"com.live.live.LoginActivity2");  
            var re = main.startActivity(intent);  

            console.log(re);