android支付宝登录闪退

Question

boolean rsa2 = (RSA2_PRIVATE.length() > 0);

        Map<String, String> authInfoMap = OrderInfoUtil2_0.buildAuthInfoMap(PID, APPID, TARGET_ID, rsa2);
        String info = OrderInfoUtil2_0.buildOrderParam(authInfoMap);

        String privateKey = rsa2 ? RSA2_PRIVATE : RSA_PRIVATE;

// String sign = OrderInfoUtil2_0.getSign(authInfoMap, privateKey, rsa2);

        final String authInfo = info + "&" + privateKey;
        Runnable authRunnable = new Runnable() {

            @Override
            public void run() {
                // 构造AuthTask 对象
                AuthTask authTask = new AuthTask(PayDemo.this);
                // 调用授权接口，获取授权结果
                Map<String, String> result = authTask.authV2(authInfo, true);

                Message msg = new Message();
                msg.what = SDK_AUTH_FLAG;
                msg.obj = result;
                mHandler.sendMessage(msg);
            }
        };

        // 必须异步调用
        Thread authThread = new Thread(authRunnable);
        authThread.start();
        这段代码执行完，app就直接闪退了，这是什么原因造成的？