Volley GET & Post JSONObject Request to API View in TextView

Question

Here is my code for "MainActivity.java", I can't post JSONObject to the API server & also can't get the response data inside the simple Textview. Please Help. I am new to Java

When I am trying to build the project it is not showing anything

http://www.zoftino.com/get-&-post-data-using-http-library-volley-in-android

Reference link is given above.

import android.content.res.Resources;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
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 org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private Button getApiBtn, postApiBtn;
    private TextView resultTextView;
    RequestQueue requestQueue;
    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        resultTextView = (TextView) findViewById(R.id.resultTextView);
        getApiBtn = (Button) findViewById(R.id.getApiBtn);
        postApiBtn = (Button)findViewById(R.id.postApiBtn);

        getApiBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getData();
            }
        });

        postApiBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                postData();
            }
        });
    }

    // methods are here for post and get
    public void postData() {

        try {
            String url = getResources().getString(R.string.url);
            JSONObject object = new JSONObject();
            JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, null, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    resultTextView.setText("Data Posted");
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_LONG).show();
                }
            }) {
                @Override
                protected Map<String, String> getParams() {
                    Map<String, String> params = new HashMap<>();
                    params.put("user_Name", "Faruk");
                    params.put("pas_sword", "1234567");
                    return params;
                }
            };
            requestQueue.add(jsonObjectRequest);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void getData(){
        try {
            String url = getResources().getString(R.string.url);
            JSONObject object = new JSONObject();
            JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, null, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    resultTextView.setText("Resposne : " + response.toString());
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_LONG).show();
                }
            });
            requestQueue.add(jsonObjectRequest);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

You need to provide `INTERNET` permission in your manifest.xml .. Have you done so? — Ümañg ßürmån, Oct 25 '18 at 09:49
Not any exception because I have used try catch for avoiding. @ Srinivasan M — SPurno, Oct 25 '18 at 10:04
here is my api url : http://posspot.com/crm/api/crm_data/check_authentication — SPurno, Oct 25 '18 at 10:05
"_Not_ _any_ _exception_ _because_ _I_ _have_ _used_ _try_ _catch_ _for_ _avoiding_" No, you are getting exceptions but you are only [sending them to System.Err](https://stackoverflow.com/questions/2560368/what-is-the-use-of-printstacktrace-method-in-java). Consider showing the error in a textbox or similar. — Cleptus, Oct 25 '18 at 10:23

score 1 · Answer 1 · answered Oct 25 '18 at 09:52

1

you forgot to Instantiate the RequestQueue .

see this https://developer.android.com/training/volley/simple#java for more clarity

answered Oct 25 '18 at 09:52

Srinivasan M

317
1
3
11

its not about SrtingRequest, I want to post JSONObject – SPurno Oct 25 '18 at 10:08
i am not meaning the request object . you need to know about object declaration in java . – Srinivasan M Oct 25 '18 at 10:38

score 1 · Answer 2 · answered Oct 25 '18 at 09:59

1

I have gone through over the Blog you have mentioned. There's one thing missed that is internet permission inAndroidManifest.xml. Please add this <uses-permission android:name="android.permission.INTERNET"/> permission to your manifest and try again.

If something else causing the problem please comment your problem clearly. Is your key name for postData method is correct? pas_sword

answered Oct 25 '18 at 09:59

Al-Amin

1,369
1
9
26

Yes I have used both android.permission.INTERNET & NETWORK_STATE – SPurno Oct 25 '18 at 10:06
Got a problem of your code - You didn't initialize `RequestQueue requestQueue;` – Al-Amin Oct 25 '18 at 10:11
1

No you didn't. You just declared a variable. Add this line of code in your `onCreate` method. `requestQueue = Volley.newRequestQueue(getApplicationContext());` – Al-Amin Oct 25 '18 at 10:17
I am still now in Android Studio. After declaring inside onCreate method RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext()); the application is stopped working. – SPurno Oct 25 '18 at 10:20

Volley GET & Post JSONObject Request to API View in TextView

2 Answers2