java.lang.NullPointerException: Can‘t toast on a thread that has not called Looper.prepare()

原因是在子线程中调用了Toast.makeText导致，如果要在子线程中调用该方法需要使用

Looper.prepare();
Toast.makeText(getActivity(),"登录成功！",Toast.LENGTH_LONG).show();
Looper.loop();