Reading JSON data from asset folder in Android

// Friends.json
{"list":[{"name":"Rajesh"},{"name":"Sudheer"},{"name":"Rao"},{"name":"Wadood"},{"name":"Jitendra"},{"name":"Naidu"},{"name":"Srinu"},{"name":"Sujith"},{"name":"Sathish"},{"name":"Amju"},{"name":""}]}

// parsing class

import java.util.ArrayList;

import java.util.HashMap;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

public class JsonParsingHelper {

private static final String TAG = JsonParsingHelper.class.getSimpleName();

public static ArrayList<Category> getCities(String countryJson) throws JSONException {

ArrayList<Category> cities = new ArrayList<Category>();

JSONArray names = null;

// getting JSON string from asset

JSONObject json = new JSONObject(countryJson);

try {

// Getting Array of Contacts

names = json.getJSONArray("list");

// looping through All Contacts

for(int i = 0; i < names.length(); i++){

JSONObject c = names.getJSONObject(i);

// Storing each json item in variable

Category cat = new Category();

String name = c.getString("name");

cat.setName(name);

cities.add(cat);

}

} catch (JSONException e) {

e.printStackTrace();

}

return cities;

}

}

// pojo class

package com.network;

import android.os.Parcel;

import android.os.Parcelable;

public class Category implements Parcelable {

String name;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

@Override

public int describeContents() {

// TODO Auto-generated method stub

return 0;

}

@Override

public void writeToParcel(Parcel dest, int flags) {

// TODO Auto-generated method stub

}

}

// Utils class

package com.network;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import android.content.Context;

import android.content.res.AssetManager;

public class Utils {

    public static void CopyStream(InputStream is, OutputStream os)

    {

        final int buffer_size=1024;

        try

        {

            byte[] bytes=new byte[buffer_size];

            for(;;)

            {

              int count=is.read(bytes, 0, buffer_size);

              if(count==-1)

                  break;

              os.write(bytes, 0, count);

            }

        }

        catch(Exception ex){}

    }

    

public static String jsonToStringFromAssetFolder(String fileName,

Context context) {

String jsonString = null;

try {

AssetManager manager = context.getAssets();

InputStream file = manager.open(fileName);

byte[] data = new byte[file.available()];

file.read(data);

file.close();

jsonString = new String(data);

} catch (IOException ie) {

}

return jsonString;

}

}

// List activity

package com.android;

import java.util.ArrayList;

import android.app.Activity;

import android.content.Context;

import android.os.AsyncTask;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.view.Window;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.Toast;

import com.network.Category;

import com.network.JsonParsingHelper;

import com.network.Utils;

public class ReadingDataFromAsset extends Activity {

TextView mCategory, mEmptyTextView;

ProgressBar mProgressBar;

ListView list;

String friendsJSON;

ArrayList<Category> arraylist;

JsonParsingHelper parser = new JsonParsingHelper();

public void onBackPressed() {

finish();

};

@Override

public void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE); // Removes title bar

setContentView(R.layout.activity_friends_list);

list = (ListView) findViewById(android.R.id.list);

mProgressBar = (ProgressBar) findViewById(R.id.progressBar);

mEmptyTextView = (TextView) findViewById(R.id.empty);

mEmptyTextView.setVisibility(View.GONE);

mProgressBar.setVisibility(View.GONE);

friendsJSON = Utils.jsonToStringFromAssetFolder("Friends.json",

getApplicationContext());

new getList().execute();

list.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

// TODO Auto-generated method stub

Toast.makeText(getApplicationContext(),

"selected " + arraylist.get(arg2).getName(), 3000)

.show();

}

});

list.setVerticalScrollBarEnabled(false);

list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

list.setCacheColorHint(getResources().getColor(

R.color.listCacheColorHint));

list.setVerticalScrollBarEnabled(false);

list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

list.setCacheColorHint(getResources().getColor(

R.color.listCacheColorHint));

}

class getList extends AsyncTask<Void, Void, Void> {

protected void onPreExecute() {

mProgressBar.setVisibility(View.VISIBLE);

}

protected Void doInBackground(Void... unused) {

try {

arraylist = parser.getFriends(friendsJSON);

} catch (Exception e) {

// TODO: handle exception

}

return null;

}

protected void onPostExecute(Void unused) {

if (arraylist != null && arraylist.size() - 1 != 0) {

list.setAdapter(new MyAdapter());

} else {

mEmptyTextView.setVisibility(View.VISIBLE);

mEmptyTextView.setText("No data found..!!");

}

mProgressBar.setVisibility(View.GONE);

}

}

public class MyAdapter extends BaseAdapter {

public int getCount() {

// TODO Auto-generated method stub

return arraylist.size() - 1;

}

public Object getItem(int arg0) {

// TODO Auto-generated method stub

return null;

}

public long getItemId(int arg0) {

// TODO Auto-generated method stub

return 0;

}

public View getView(final int position, View v1, ViewGroup arg2) {

// TODO Auto-generated method stub

View v = null;

LayoutInflater l = (LayoutInflater) getApplicationContext()

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

v = l.inflate(R.layout.adapter_content, null);

// list-optimisation

View rowview = v;

if (rowview == null) {

LayoutInflater linf = (LayoutInflater) getApplicationContext()

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

rowview = linf.inflate(R.layout.adapter_content, null);

}

mCategory = (TextView) v.findViewById(R.id.category);

mCategory.setText(arraylist.get(position).getName());

return v;

}

}

}

// activity_friends_list layout

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

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

    android:layout_width="fill_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <RelativeLayout

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:padding="5dp" >

        <ListView

            android:id="@id/android:list"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:drawSelectorOnTop="false"

            android:padding="10dp"

            android:divider="#000000"

            android:dividerHeight="1dp"

            />

        <TextView

            android:id="@+id/emptyText"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerInParent="true"

            android:textColor="#000000"

            android:textStyle="bold" />

        <ProgressBar

            android:id="@+id/progressBar"

            style="?android:attr/progressBarStyleLarge"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerInParent="true" />

        <TextView

            android:id="@+id/empty"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignTop="@+id/emptyText"

            android:layout_centerHorizontal="true"

            android:text="No results found"

            android:textAppearance="?android:attr/textAppearanceMedium"

            android:visibility="gone"/>

    </RelativeLayout>

</LinearLayout>

// row layout  - adapter_content

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

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

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:padding="5dip" >

    <TextView

        android:id="@+id/category"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_centerVertical="true"

        android:layout_marginLeft="5dp"

        android:layout_marginRight="5dp"

        android:layout_toLeftOf="@+id/img"

        android:text="friend name"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:textColor="#000000"/>

    <ImageView

        android:id="@+id/img"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_centerVertical="true"

        android:background="@drawable/right_arrow" />

</RelativeLayout>