.
Get JSON Data |
Create new empty project volleyGetJson |
Add library in Graddle Dependencies |
// volley library implementation ‘com.android.volley:volley:1.1.1’ // image loading library implementation ‘com.squareup.picasso:picasso:2.71828’ |
Add INTERNET permission in AndroidManifest |
<!--permissions for INTERNET--> <uses-permission android:name="android.permission.INTERNET"/> |
Update activity_main layout |
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity">
<androidx.cardview.widget.CardView android:id="@+id/idCVCourse" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp" android:elevation="10dp" android:visibility="gone" app:cardCornerRadius="8dp">
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical">
<ImageView android:id="@+id/idIVCourse" android:layout_width="match_parent" android:layout_height="300dp" android:layout_margin="5dp" />
<TextView android:id="@+id/idTVCourseName" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:padding="5dp" android:text="Course Name " android:textColor="@color/black" android:textSize="18sp" android:textStyle="bold" />
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:orientation="horizontal" android:weightSum="2">
<TextView android:id="@+id/idTVBatch" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:padding="5dp" android:text="Batch" android:textColor="@color/black" />
<TextView android:id="@+id/idTVTracks" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:padding="5dp" android:text="Tracks" android:textColor="@color/black" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
<ProgressBar android:id="@+id/idLoadingPB" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:visibility="visible" />
</RelativeLayout> |
Update MainActivity.java |
import android.os.Bundle; import android.view.View; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity; import androidx.cardview.widget.CardView;
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 com.squareup.picasso.Picasso;
import org.json.JSONException; import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
// creating variables for our textview, // imageview,cardview and progressbar. private TextView courseNameTV, courseTracksTV, courseBatchTV; private ImageView courseIV; private ProgressBar loadingPB; private CardView courseCV;
// below line is the variable for url from // where we will be querying our data. String url = "http://tutorial.razzi.my/android101/json/get/";
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
// in below line we are initializing our all views. loadingPB = findViewById(R.id.idLoadingPB); courseCV = findViewById(R.id.idCVCourse); courseNameTV = findViewById(R.id.idTVCourseName); courseTracksTV = findViewById(R.id.idTVTracks); courseBatchTV = findViewById(R.id.idTVBatch); courseIV = findViewById(R.id.idIVCourse);
// creating a new variable for our request queue RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
// as our data is in json object format so we are using // json object request to make data request from our url. // in below line we are making a json object // request and creating a new json object request. // inside our json object request we are calling a // method to get the data, "url" from where we are // calling our data,"null" as we are not passing any data. // later on we are calling response listener method // to get the response from our API. JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { // inside the on response method. // we are hiding our progress bar. loadingPB.setVisibility(View.GONE);
// in below line we are making our card // view visible after we get all the data. courseCV.setVisibility(View.VISIBLE); try { // now we get our response from API in json object format. // in below line we are extracting a string with its key // value from our json object. // similarly we are extracting all the strings from our json object. String courseName = response.getString("courseName"); String courseTracks = response.getString("courseTracks"); String courseMode = response.getString("courseMode"); String courseImageURL = response.getString("courseimg");
// after extracting all the data we are // setting that data to all our views. courseNameTV.setText(courseName); courseTracksTV.setText(courseTracks); courseBatchTV.setText(courseMode);
// we are using picasso to load the image from url. Picasso.get().load(courseImageURL).into(courseIV); } catch (JSONException e) { // if we do not extract data from json object properly. // below line of code is use to handle json exception e.printStackTrace(); } } }, new Response.ErrorListener() { // this is the error listener method which // we will call if we get any error from API. @Override public void onErrorResponse(VolleyError error) { // below line is use to display a toast message along with our error. Toast.makeText(MainActivity.this, "Fail to get data..", Toast.LENGTH_SHORT).show(); } }); // at last we are adding our json // object request to our request // queue to fetch all the json data. queue.add(jsonObjectRequest); } } |
Post JSON Data |
Create new empty project volleyPostJson |
Add library in Graddle Dependencies |
// volley library implementation ‘com.android.volley:volley:1.1.1’ |
Add INTERNET permission in AndroidManifest |
<!--permissions for INTERNET--> <uses-permission android:name="android.permission.INTERNET"/> |
Update activity_main layout |
<?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 email--> <EditText android:id="@+id/idEdtEmail" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp" android:hint="Enter your email" />
<!--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> |
Update MainActivity.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, emailEdt; 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); emailEdt = findViewById(R.id.idEdtEmail); 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() && emailEdt.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 name and email. postDataUsingVolley(nameEdt.getText().toString(), emailEdt.getText().toString()); } }); }
private void postDataUsingVolley(String name, String email) { // url to post data String url = "http://tutorial.razzi.my/android101/json/post/register.php"; loadingPB.setVisibility(View.VISIBLE);
// creating a new variable for request queue RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
// calling a string // request method to post the data to API // i.e. 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(""); emailEdt.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 email = respObj.getString("email");
// setting the strings to text view. responseTV.setText("Name : " + name + "\n" + "Email : " + email); } 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>();
// passing key // and value pair to parameters. params.put("name", name); params.put("email", email);
// returning params. return params; } }; // make // a json object request. queue.add(request); } } |
index.php
-----
<?php
$output = '{"courseName":"Android Development","courseimg":"https://i.ibb.co/XZPvkqd/bookandroid.png","courseMode":"Online","courseTracks":"50 Tracks"}';
echo $output;
?>
register.php
-----
<?php
$myObj = new stdClass();
$myObj->name=$_POST["name"];
$myObj->email=$_POST["email"];
$myJSON = json_encode($myObj);
echo $myJSON;
?>
apply.html
-----
<form method="post" action="register.php">
<input name="name" />
<br/>
<input name="email" />
<br/>
<button type="submit">OK</button>
</form>
.
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