I cannot make a network call using a volley. I tried many solutions but no one worked

Question

When I make a network call using jsonObject request. I do not get an answer. I always get an HTTP request for request = <[] in front of my url. I tried these links but nothing worked for me. [Android Volley double post when slow query Source1 , source2 , Source 3

package com.example.mts3.hammadnewsapp; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.widget.TextView; import android.widget.Toast; import com.android.volley.DefaultRetryPolicy; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.JsonObjectRequest; import com.android.volley.toolbox.Volley; import org.json.JSONObject; import java.util.ArrayList; public class NewsDetailsActivity extends AppCompatActivity { RecyclerView recyclerView; NewsAdapter adapter; ArrayList<NewsOpen> newsList =new ArrayList<>(); Intent intent; TextView tv_newsheading; SharedPreferences sharedPreferences; SharedPreferences.Editor editor; Context context; String DATA_URL="http://ec2-54-147-238-136.compute-1.amazonaws.com/hmc/api/getnewsfeeds?order=asc"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_news_details); Toolbar toolbar = findViewById(R.id.toolbar); setSupportActionBar(toolbar); newsList = new ArrayList<>(); recyclerView = findViewById(R.id.rv_newsdetails); recyclerView.setLayoutManager(new LinearLayoutManager(this)); adapter = new NewsAdapter(this, newsList); String string = (String) getText(R.string.random_text); newsList.add(new NewsOpen(R.drawable.hdr_bg_plain, "Chief Medical Officer", "10-11-2020", string)); // newsList.add(new NewsOpen("image!!", "Chief Medical Officer", "10-11-2020", string)); recyclerView.setAdapter(adapter); /*backgroundTask.getList(new BackgroundTask.arrayCallBack() { @Override public void onSuccess(ArrayList<Contact> contacts) { adapter = new RecyclerAdapter(contacts); recyclerView.setAdapter(adapter); } @Override public void onFail(String msg) { // Do Stuff } });*/ } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_news_list, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_share) { //Toast.makeText(NewsDetailsActivity.this, "Share menu clicked ", Toast.LENGTH_LONG).show(); callApi(); return true; } if (id == R.id.action_logout) { sharedPreferences= PreferenceManager.getDefaultSharedPreferences(this); editor= sharedPreferences.edit(); editor.putBoolean("Verified user",false); editor.commit(); Toast.makeText(NewsDetailsActivity.this,"Logged out ",Toast.LENGTH_LONG).show(); Intent intent=new Intent(NewsDetailsActivity.this,MainActivity.class); startActivity(intent); return true; } return super.onOptionsItemSelected(item); } private void callApi() { // new DefaultRetryPolicy(30000, 0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); // int x=3;// retry count // DefaultRetryPolicy defaultRetryPolicy=new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS*1,x,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); //DefaultRetryPolicy defaultRetryPolicy= new DefaultRetryPolicy(20 * 1000, 0, 1.0f); RequestQueue requestQueue= Volley.newRequestQueue(this); //System.setProperty("http.keepAlive", "false"); JsonObjectRequest jsonObject =new JsonObjectRequest(Request.Method.GET,DATA_URL, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { Log.e("res",response.toString()); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { } }); //int x=2;// retry count //jsonObject.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 48, x, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); //jsonObject.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 48,0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); //jsonObject.setRetryPolicy(new DefaultRetryPolicy(0, -1, 0)); //jsonObject.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 2, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); //jsonObject.setRetryPolicy(new DefaultRetryPolicy(0,-1, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); /*jsonObject.setRetryPolicy( new DefaultRetryPolicy( 500000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT ) );*/ //jsonObject.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 2, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); //new DefaultRetryPolicy(10000, 0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); //jsonObject.setRetryPolicy(new DefaultRetryPolicy(0, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); //jsonObject.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 2, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); //int socketTimeout = 30000;//30 seconds - change to what you want // RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); // jsonObject.setRetryPolicy(policy); int custom_timeout_ms = 10000; DefaultRetryPolicy policy = new DefaultRetryPolicy(custom_timeout_ms, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); jsonObject.setRetryPolicy(policy); requestQueue.add(jsonObject); } } 

// Sorry for any problem with this line. I only do this to complete the length of the description character, because the stack does not allow me to post a question

Answer 1

Another solution using StringRequest to get Json Response

  private void callApi() { RequestQueue mrequestQueue; StringRequest stringRequest; mrequestQueue = Volley.newRequestQueue(this); stringRequest = new StringRequest(Request.Method.GET, DATA_URL, new Response.Listener<String>() { @Override public void onResponse(String response) { try { JSONObject jsonObject = new JSONObject(response); System.out.println("json"+jsonObject); } catch (JSONException e) { e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { //Log.i(TAG, "Response: " + error.toString()); } }); mrequestQueue.add(stringRequest); } 

Answer 2

if your application terminates before a response, it causes a connection timeout. You must also add the connection timeout to volley and repeat the policy. Here is an example

  JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, request, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { } }, new VolleyErrorListener(this, AuthController.LOGIN_ERROR)) { @Override public Map<String, String> getHeaders() throws AuthFailureError { return new VolleyHeader().getHeaders(); } }; jsonObjectRequest.setRetryPolicy(new DefaultRetryPolicy( 50000, 0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); NetworkRequestQueue.getInstance(mContext).getRequestQueue().add(jsonObjectRequest); 

The NetworkRequestQueue class is as follows:

 public class NetworkRequestQueue { private static NetworkRequestQueue mInstance; private static Context mCtx; private RequestQueue mRequestQueue; private ImageLoader mImageLoader; private NetworkRequestQueue(Context context) { mCtx = context; mRequestQueue = getRequestQueue(); mImageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() { private final LruCache<String, Bitmap> cache = new LruCache<String, Bitmap>(20); @Override public Bitmap getBitmap(String url) { return cache.get(url); } @Override public void putBitmap(String url, Bitmap bitmap) { cache.put(url, bitmap); } }); } public static synchronized NetworkRequestQueue getInstance(Context context) { if (mInstance == null) { mInstance = new NetworkRequestQueue(context); } return mInstance; } public RequestQueue getRequestQueue() { if (mRequestQueue == null) { Cache cache = new DiskBasedCache(mCtx.getCacheDir(), 10 * 1024 * 1024); Network network = new BasicNetwork(new HurlStack()); mRequestQueue = new RequestQueue(cache, network); // Don't forget to start the volley request queue mRequestQueue.start(); } return mRequestQueue; } public ImageLoader getImageLoader() { return mImageLoader; } 

}

Answer 3

Try this with a query string

 public class TestActivity extends AppCompatActivity { RequestQueue requestQueue; String DATA_URL = "http://ec2-54-147-238-136.compute-1.amazonaws.com/hmc/api/getnewsfeeds?order=asc"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); requestQueue = Volley.newRequestQueue(this); callApi(); } private void callApi() { StringRequest stringRequest = new StringRequest(Request.Method.GET, DATA_URL, new Response.Listener<String>() { @Override public void onResponse(String response) { Log.e("res", response); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e("onErrorResponse: ", error.getLocalizedMessage()); } }); requestQueue.add(stringRequest); } 

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Answer 4

 **change your DefaultRetryPolicy with this Code** DefaultRetryPolicy policy = new DefaultRetryPolicy(0, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); jsonObject.setRetryPolicy(policy);