JSON Example

• JSON :- JavaScript Object Notation
• It contains key/value pairs
• Key-> Strings
• Values:->JSON
• {}   :-> JSON Object
• []    :-> JSON array

Syntax :

{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}

package csdevbin.json; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import org.json.JSONObject; public class MainActivity extends AppCompatActivity {     public static final String JSON_STRING = "{\"employee\":{\"name\":\"John\",\"salary\":6000}}";     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         TextView textView1 = (TextView) findViewById(R.id.textView1);         try {             JSONObject emp = (new JSONObject(JSON_STRING)).getJSONObject("employee");             String empname = emp.getString("name");             int empsalary = emp.getInt("salary");             String str = "Employee Name:" + empname + "\n" + "Employee Salary:" + empsalary;             textView1.setText(str);         } catch (Exception e) {             e.printStackTrace();         }     } }

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/activity_main"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context="csdevbin.json.MainActivity">     <TextView         android:id="@+id/textView1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentLeft="true"         android:layout_alignParentTop="true"         android:layout_marginLeft="75dp"         android:layout_marginTop="46dp"         android:text="TextView" /> </RelativeLayout>

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