JSON parsing in Android application

Today i will explain how to parse JSON (Java Script Object Notation) in android application.
Following file my source code

MainActivity.java

1. package com.example.jsonparcer;
   
   import java.io.BufferedReader;
   import java.io.InputStream;
   import java.io.InputStreamReader;
   import org.json.JSONObject;
   import android.app.Activity;
   import android.os.Bundle;
   import android.util.Log;
   import android.view.Menu;
   import android.view.View;
   import android.view.View.OnClickListener;
   import android.widget.Button;
   import android.widget.TextView;
   
   public class MainActivity extends Activity {
   
       BufferedReader bReader = null;
       TextView name,date,hours;
       Button data;
    
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   
   setContentView(R.layout.activity_main);
   name=(TextView) findViewById(R.id.name);
   date=(TextView) findViewById(R.id.date);
   hours=(TextView) findViewById(R.id.hours);
   data=(Button) findViewById(R.id.data);
   data.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
   try {
   
   
   InputStream work = getApplicationContext().getResources()
                  .openRawResource(R.raw.work);
   
   bReader=new BufferedReader(new InputStreamReader(work));
   StringBuilder quesString = new StringBuilder();
           String aJsonLine = null;
           while ((aJsonLine = bReader.readLine()) != null) {
                   quesString.append(aJsonLine);
           }
          
           Log.d(this.getClass().toString(), quesString.toString());
           String workjson=quesString.toString();
           JSONObject quesObj = new JSONObject(quesString.toString());
           JSONObject TimeTable  = quesObj.getJSONObject("TimeTable");
           name.append(TimeTable.getString("name"));
           date.append(TimeTable.getString("date"));
           hours.append(TimeTable.getString("time"));
          
   } catch (Exception e){
            
          } finally {
                      try {
                              bReader.close();
                      } catch (Exception e) {
                              Log.e("", e.getMessage().toString(), e.getCause());
                      }
   
          }
   
   }
   });
   
   
   
   }
   
   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
   // Inflate the menu; this adds items to the action bar if it is present.
   getMenuInflater().inflate(R.menu.main, menu);
   return true;
   }
   
   }

AndroidManifest.xml

  <?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

  package="com.example.jsonparcer"

  android:versionCode="1"

  android:versionName="1.0" >

  <uses-sdk

  android:minSdkVersion="8"

  android:targetSdkVersion="19" />

  <application

  android:allowBackup="true"

  android:icon="@drawable/ic_launcher"

  android:label="@string/app_name"

  android:theme="@style/AppTheme" >

  <activity

  android:name="com.example.jsonparcer.MainActivity"

  android:label="@string/app_name" >

  <intent-filter>

  <action android:name="android.intent.action.MAIN" />

  <category android:name="android.intent.category.LAUNCHER" />

  </intent-filter>

  </activity>

  </application>

</manifest>

activity_main.xml

<RelativeLayout 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: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=".MainActivity" >

  <TextView

  android:id="@+id/name"

  android:layout_width="wrap_content"

  android:textSize="20dp"

  android:layout_height="wrap_content"

  android:text="@string/Employ" />

  <TextView

  android:id="@+id/date"

  android:layout_width="wrap_content"

  android:layout_height="wrap_content"

  android:textSize="20dp"

  android:layout_alignLeft="@+id/name"

  android:layout_below="@+id/name"

  android:layout_marginTop="23dp"

  android:text="@string/Date" />

  <TextView

  android:id="@+id/hours"

  android:layout_width="wrap_content"

  android:layout_height="wrap_content"

  android:textSize="20dp"

  android:layout_below="@+id/date"

  android:layout_marginTop="26dp"

  android:text="@string/Time" />

  <Button

  android:id="@+id/data"

  android:layout_width="wrap_content"

  android:layout_height="wrap_content"

  android:layout_alignParentBottom="true"

  android:layout_centerHorizontal="true"

  android:layout_marginBottom="126dp"

  android:text="@string/Data" />

</RelativeLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

  <string name="app_name">Jsonparcer</string>

  <string name="action_settings">Settings</string>

  <string name="hello_world">Hello world!</string>

  <string name="Employ">Ename :</string>

  <string name="Date">Date :</string>

  <string name="Time">WHours :</string>

  <string name="Data">Data</string>

</resources>

work.txt

{

  "TimeTable":{

  "name":"Vamsi",

  "date":"8-07-2014",

  "time":"8hours"

  }

}

Above codes are my source code for parsing json object using android . After running above code following screenshot will be generated

After button pressing it will retrieve data from work.txt next it will show using Textview on screen

Creating JSON file programitically

JSON stands for Java Script Object Notation. It is user for data saving .Today this post explain creating JSON file and writing values inside file using android programming.


MainActivity.java


 package com.example.jsonwriter;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
JSONObject object = new JSONObject();
 try {
   object.put("name", "vamsi krishna");
   object.put("score", new Integer(44));
   object.put("current", new Double(40));
   object.put("nickname", "vk");
 } catch (JSONException e) {
   e.printStackTrace();
 }
 System.out.println("------"+object);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

AndroidManifest.xml, layout file are same after creating project change accordingly as your date in MainActivity class  

After running above my application it will give following screenshots

Above picture logcat showing out of application(Green color lines)