How to Post Data to API using Volley in Android? - GeeksforGeeks

14 Apr, 2022
We have seen reading the data from API using Volley request with the help of GET request in Android. With the help of GET Request, we can display data from API in JSON format and use that data inside our application. In this article, we will take a look at posting our data to API using the POST request with the Volley library in Android. 
We will be building a simple application in which we will be displaying two EditText fields and for name and a job and we will take that data from our users and post that data to our API. For this, we are using a sample that requires API which is available free for testing. A sample video is given below to get an idea about what we are going to do in this article. Note that we are going to implement this project using the Java language. 
Data can be added to API in different formats such as XML, Form, and JSON. Most of the APIs post their data in JSON format. So we will also be posting our data to our API in the form of the JSON object.  
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.
Step 2: Add the below dependency in your build.gradle file
Below is the dependency for Volley which we will be using to get the data from API. For adding this dependency navigate to the app > Gradle Scripts > build.gradle(app) and add the below dependency in the dependencies section.  
implementation ‘com.android.volley:volley:1.1.1’
After adding this dependency sync your project and now move towards the AndroidManifest.xml part.  
Step 3: Adding permissions to the internet in the AndroidManifest.xml file
Navigate to the app > AndroidManifest.xml and add the below code to it.  
XML
<!--permissions for INTERNET--><uses-permission android:name="android.permission.INTERNET"/>
Step 4: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. 
XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity">     <!--edit text field for adding name-->    <EditText        android:id="@+id/idEdtName"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="10dp"        android:layout_marginTop="40dp"        android:hint="Enter your name" />     <!--edit text for adding job-->    <EditText        android:id="@+id/idEdtJob"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="10dp"        android:hint="Enter your job" />     <!--button for adding data-->    <Button        android:id="@+id/idBtnPost"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="20dp"        android:text="Send Data to API"        android:textAllCaps="false" />     <!--text view for displaying our API response-->    <TextView        android:id="@+id/idTVResponse"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="10dp"        android:gravity="center_horizontal"        android:text="Response"        android:textAlignment="center"        android:textSize="15sp" />     <!--progress bar for loading -->    <ProgressBar        android:id="@+id/idLoadingPB"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:visibility="gone" /> </LinearLayout>
Step 5: Working with the MainActivity.java file
Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.
Java
import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import com.android.volley.Request;import com.android.volley.RequestQueue;import com.android.volley.VolleyError;import com.android.volley.toolbox.StringRequest;import com.android.volley.toolbox.Volley; import org.json.JSONException;import org.json.JSONObject; import java.util.HashMap;import java.util.Map; public class MainActivity extends AppCompatActivity {     // creating variables for our edittext,    // button, textview and progressbar.    private EditText nameEdt, jobEdt;    private Button postDataBtn;    private TextView responseTV;    private ProgressBar loadingPB;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                 // initializing our views        nameEdt = findViewById(R.id.idEdtName);        jobEdt = findViewById(R.id.idEdtJob);        postDataBtn = findViewById(R.id.idBtnPost);        responseTV = findViewById(R.id.idTVResponse);        loadingPB = findViewById(R.id.idLoadingPB);                 // adding on click listener to our button.        postDataBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                // validating if the text field is empty or not.                if (nameEdt.getText().toString().isEmpty() && jobEdt.getText().toString().isEmpty()) {                    Toast.makeText(MainActivity.this, "Please enter both the values", Toast.LENGTH_SHORT).show();                    return;                }                // calling a method to post the data and passing our name and job.                postDataUsingVolley(nameEdt.getText().toString(), jobEdt.getText().toString());            }        });    }     private void postDataUsingVolley(String name, String job) {        // url to post our data        String url = "https://reqres.in/api/users";        loadingPB.setVisibility(View.VISIBLE);                 // creating a new variable for our request queue        RequestQueue queue = Volley.newRequestQueue(MainActivity.this);                 // on below line we are calling a string        // request method to post the data to our API        // in this we are calling a post method.        StringRequest request = new StringRequest(Request.Method.POST, url, new com.android.volley.Response.Listener<String>() {            @Override            public void onResponse(String response) {                // inside on response method we are                // hiding our progress bar                // and setting data to edit text as empty                loadingPB.setVisibility(View.GONE);                nameEdt.setText("");                jobEdt.setText("");                                 // on below line we are displaying a success toast message.                Toast.makeText(MainActivity.this, "Data added to API", Toast.LENGTH_SHORT).show();                try {                    // on below line we are parsing the response                    // to json object to extract data from it.                    JSONObject respObj = new JSONObject(response);                                         // below are the strings which we                    // extract from our json object.                    String name = respObj.getString("name");                    String job = respObj.getString("job");                                         // on below line we are setting this string s to our text view.                    responseTV.setText("Name : " + name + "\n" + "Job : " + job);                } catch (JSONException e) {                    e.printStackTrace();                }            }        }, new com.android.volley.Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                // method to handle errors.                Toast.makeText(MainActivity.this, "Fail to get response = " + error, Toast.LENGTH_SHORT).show();            }        }) {            @Override            protected Map<String, String> getParams() {                // below line we are creating a map for                // storing our values in key and value pair.                Map<String, String> params = new HashMap<String, String>();                                 // on below line we are passing our key                // and value pair to our parameters.                params.put("name", name);                params.put("job", job);                                 // at last we are                // returning our params.                return params;            }        };        // below line is to make        // a json object request.        queue.add(request);    }}
Now run your app and see the output of the app by adding the data. 
anuragatiit
android
Technical Scripter 2020
Android
Java
Technical Scripter
Java
Android
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