截击错误

Question

我正在使用带有二维码阅读器的应用程序工作。我正在尝试使用凌空库向服务器发送http发布请求。但是，它直接跳到该行的错误例外。这是我的代码，

 send.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {

Toast.makeText(QRCODEPAGE1.this, "Started", Toast.LENGTH_SHORT).show();
            RequestQueue mRequestQueue = Volley.newRequestQueue(QRCODEPAGE1.this);
            String url = "http://api-dev.eportfolioapi.com/api/sensor/plan";
          //  String url = "http://localhost:5000/api/sensor/updateDeviceStage/5b3e6e788030580019ebc333";
            Cache cache = new DiskBasedCache(getCacheDir(), 1024*1024);
            Network network = new BasicNetwork(new HurlStack());
            //mRequestQueue = new RequestQueue(cache, network);
            Toast.makeText(QRCODEPAGE1.this, "DONE", Toast.LENGTH_SHORT).show();

            StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    tvresult.setText("Response is:" + response.substring(0, 2000));
                    Toast.makeText(QRCODEPAGE1.this, "YOU DID IT", Toast.LENGTH_LONG).show();
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    tvresult.setText("That didn't work!");
                    Toast.makeText(QRCODEPAGE1.this, "Wish harder", Toast.LENGTH_SHORT).show();
                }
            });

            //mRequestQueue.add(stringRequest);

            stringRequest.setTag(TAG);
            mRequestQueue.add(stringRequest);

请注意，我在应用程序gradle和清单中添加了必要的内容。

这就是我的代码现在的样子...

 send.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {

 Toast.makeText(QRCODEPAGE1.this, "Make it work", Toast.LENGTH_SHORT).show();
           // Intent meow = new Intent(QRCODEPAGE1.this, QRLASTPAGE.class);
           // startActivity(meow);

            Toast.makeText(QRCODEPAGE1.this, "Started", 
  Toast.LENGTH_SHORT).show();
            RequestQueue mRequestQueue = 
  Volley.newRequestQueue(QRCODEPAGE1.this);
            String url = "http://api- 
dev.eportfolioapi.com/api/sensor/install";
            Cache cache = new DiskBasedCache(getCacheDir(), 1024*1024);
            Network network = new BasicNetwork(new HurlStack());
            //Looper.prepare();
            //mRequestQueue = new RequestQueue(cache, network);
            Toast.makeText(QRCODEPAGE1.this, "DONE", 
 Toast.LENGTH_SHORT).show();

            StringRequest request = new StringRequest(Request.Method.POST, 
 url, new Response.Listener<String>() {
    @Override
    public void onResponse(String response) {
Toast.makeText(QRCODEPAGE1.this, "you passed", Toast.LENGTH_SHORT).show();
        System.out.println(response.toString());
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
//Toast.makeText(QRCODEPAGE1.this, "you failed", Toast.LENGTH_SHORT).show();
        Toast.makeText(QRCODEPAGE1.this, String.valueOf(error), 
Toast.LENGTH_LONG).show();
        Log.e("Volley ERROR: ", error.toString());
       // Looper.prepare();
    }
}) {
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
   Toast.makeText(QRCODEPAGE1.this, "Params", Toast.LENGTH_SHORT).show();
        Map<String, String> params = new HashMap<String, String>();
        params.put("userId", tvresult.getText().toString());
        Toast.makeText(QRCODEPAGE1.this, "you passed userid", 
  Toast.LENGTH_SHORT).show();
        params.put("customerId", custID.toString());
        Toast.makeText(QRCODEPAGE1.this, "you passed custid", 
  Toast.LENGTH_SHORT).show();
        params.put("sensorId", tvresult.getText().toString());
        Toast.makeText(QRCODEPAGE1.this, "sensorid", 
  Toast.LENGTH_SHORT).show();
        params.put("projectId", tvresult.getText().toString());
        Toast.makeText(QRCODEPAGE1.this, "you passed proid", 
 Toast.LENGTH_SHORT).show();
        params.put("sensorVendorID", tvresult.getText().toString());
        params.put("sensorGatewayId", tvresult.getText().toString());
       // params.put("qrCodeUrl", );
        params.put("lat", textLat.getText().toString());
        Toast.makeText(QRCODEPAGE1.this, "lat", Toast.LENGTH_SHORT).show();
        params.put("long", textLong.getText().toString());
        Toast.makeText(QRCODEPAGE1.this, "long", Toast.LENGTH_SHORT).show();
        params.put("locationWithinFacility", descprit.getText().toString());
        return params;

    }
};

            request.setTag(TAG);
            mRequestQueue.add(request);

我收到一条错误消息，说我需要添加Looper.prepare（）。我应该放在哪里？

Answer 1

您正尝试发出类似Request.Method.GET的get请求，而您的api需要类似Request.Method.POST的post请求，同样在检查api时，您还需要传递这些参数{{1} }

userId, customerId, projectId, taskId, name and prTypeId

发出这样的请求：

postman result

在StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() { @Override public void onResponse(String response) { System.out.println(response.toString()); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { } }) { @Override protected Map<String, String> getParams() throws AuthFailureError { Map<String, String> params = new HashMap<String, String>(); params.put("userId", ""); params.put("customerId", ""); params.put("projectId", ""); params.put("taskId", ""); params.put("name", ""); params.put("prTypeId", ""); return params; } }; 内传递所有必需的参数和相应的值