App crash when create android native dialog by plugin

[smilelance]

Ｉcall this function to start a native dialog from my c# script

public static void NoticeWithTitleMsgAndBtn(string title, string msg, string btn){
Debug.Log(“Android NoticeWithTitleMsgAndBtn msg:” + msg);
using (AndroidJavaClass jc = new AndroidJavaClass(“com.unity3d.player.UnityPlayer”)){
using (AndroidJavaObject jo = jc.GetStatic(“currentActivity”)){
jo.Call(“noticeWithTitleMsgAndBtn”, title, msg, btn);
}
}
}

When get call from c# script, my android java code on my activity start dialog like this:

public void noticeWithTitleMsgAndBtn(String title, String msg, String btn){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(title);
builder.setMessage(msg);
builder.setNegativeButton(btn, null);
builder.create().show();
}

but then my app will crash 100%

[smilelance]

after i updated to 3.5.6 windows, it will no crash, but he dialog box still couldn’t been shown