// 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>
