Android JSON Parser Example

In this example we will see how to parse a JavaScript Object Notation(JSON) response. Here we will use a set of classes from the org.json package offered in Android SDK by simply creating new JSONObject from the formatted string data.

Let us parse the following JSON response:

JSON response:

{
“person”:{
“name”:“Jack”,
“age”:27
}
}

1.Create a new project File ->New -> Project ->Android ->Android Application Project. Follow the wizard to create a project. After the project is created in the layout file activity_main.xml (in my case) create two text views and give the id as name and age. Refer the below code.

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="110dp"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />

    <TextView
        android:id="@+id/age"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/name"
        android:layout_centerVertical="true"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />

</RelativeLayout>

2.Now in the corresponding java file MainActivity.java (in my case) we will put the JSON response in a string and parse it. Since JSON parser is strict by default , meaning the execution will halt with an exception if an invalid JSON data is found or no data is found.

MainActivity.java:

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {

 public static final String JSON_STRING = "{\"person\":{\"name\":\"Jack Sparrow\",\"age\":27}}";

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  TextView name = (TextView) findViewById(R.id.name);
  TextView age = (TextView) findViewById(R.id.age);
  try {
   JSONObject person = (new JSONObject(JSON_STRING))
     .getJSONObject("person");
   String Name = person.getString("name");
   int Age = person.getInt("age");
   name.setText("Whats the name?\n" + Name);
   age.setText("Whats the age?\n" + Age);
  } catch (JSONException e) {
   e.printStackTrace();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

}

3.Run the project by rightclicking project Run as → android project.

Output:

The output of this example would be similar to the one as follows: