使用python搭建服务器并实现Android端与之通信的方法

@app.route('/')
def hello_world():
  return 'Hello World!'

@app.route('/demo', methods=['POST'])
def demo():
  value = request.form['demo_tag']
  print(value)
  return "ok"

@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ok = findViewById(R.id.ok);
    username = findViewById(R.id.username);
    password = findViewById(R.id.password);


    ok.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        String name = String.valueOf(username.getText());
        String pass = String.valueOf(password.getText());
        String url = "http://112.86.199.151:5000/gesture";//替换成自己的服务器地址
        SendMessage(url, name, pass);
      }
    });
  }


  private void SendMessage(String url, final String userName, String passWord) {

    value = new float[550];
    Random random = new Random();
    for (int i = 0; i < 550; i++) {
      if (i % 2 == 0) {
        value[i] = random.nextFloat();
      } else {
        value[i] = -random.nextFloat();
      }

    }
    String str_value = FloatArrayToString(value);

    OkHttpClient client = new OkHttpClient();
    FormBody.Builder formBuilder = new FormBody.Builder();
    formBuilder.add("demo", str_value);

    Request request = new Request.Builder().url(url).post(formBuilder.build()).build();
    Call call = client.newCall(request);
    call.enqueue(new Callback() {
      @Override
      public void onFailure(Call call, IOException e) {
        runOnUiThread(new Runnable() {
          @Override
          public void run() {
            runOnUiThread(new Runnable() {
              @Override
              public void run() {
                Toast.makeText(MainActivity.this, "服务器错误", Toast.LENGTH_SHORT).show();
              }
            });
          }
        });
      }

      @Override
      public void onResponse(Call call, final Response response) throws IOException {
        final String res = response.body().string();
        runOnUiThread(new Runnable() {
          @Override
          public void run() {
            if (res.equals("0")) {
              runOnUiThread(new Runnable() {
                @Override
                public void run() {
                  Toast.makeText(MainActivity.this, "失败", Toast.LENGTH_SHORT).show();
                }
              });
            } else {
              runOnUiThread(new Runnable() {
                @Override
                public void run() {
                  Toast.makeText(MainActivity.this, "成功"+res, Toast.LENGTH_SHORT).show();
                }
              });

            }

          }
        });
      }
    });

  }