问Android Volley似乎无法连接到Flask本地主机地址，以获得从烧瓶返回字符串的GET方法？

EN

// I already add the uses-permission for INTERNET to manifest
<uses-permission android:name="android.permission.INTERNET" />

// and add volley to gradle depedencies
compile 'com.android.volley:volley:1.0.0'


StringRequest stringRequest; 
RequestQueue mRequestQueue;  

String url = "http://localhost:5000/bacon"; // This is the localhost to FLask

RequestQueue queue = Volley.newRequestQueue(BaconActivity.this);
stringRequest = new StringRequest(
            Request.Method.GET,
            url,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    Toast.makeText(BaconActivity.this, response, Toast.LENGTH_SHORT).show();
                    redirectLinkToLogin();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError volleyError) {
                    Toast.makeText(BaconActivity.this, "That didn't work!", Toast.LENGTH_SHORT).show();
                }
            }
    );

queue.add(stringRequest);

from flask import Flask, request


app = Flask(__name__)
@app.route('/bacon', methods=['GET', 'POST'])
def bacon():
    if request.method == 'GET':
        return 'You are probably using GET'
    else:
        return 'You are probably using POST'


if __name__ == "__main__":
    app.run(debug=True, host='localhost')