Androidide: April 2014

Example to parse data from a simple JSON fromat
From the URL : "http://yourwebsite.com/getCities";
{ //JSON Object
"list":[ //JSON Array
{"name":"Hyderabad"},
{"name":"Mumbai"},
{"name":"Delhi"}
] //JSON Array
} //JSON Object

Now check the following code,
1.ListActivty
2.ParserClass
3.ServiceHandlerClass
4.Pojo Class
And List, Row XML layouts

package com.example.testapp;

import java.util.ArrayList;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.parsing.Parsing;
import com.parsing.Pojo;

public class ListActivity extends Activity {
ListView list;
MyAdapter mAdapter = new MyAdapter();
LoadData load = new LoadData();

ArrayList<Pojo> listObj;
//JsonParsing parser = new JsonParsing();
Parsing parser = new Parsing();

String mUrl;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
list = (ListView) findViewById(R.id.listView);

mUrl = "http://urdomain.com/getCitiesService";

// { "list":[{"name":"Hyderabad"},{"name":"Mumbai"},{"name":"Delhi"} ] }

load.execute();

}

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

ProgressDialog dialog;

@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
dialog = ProgressDialog.show(ListActivity.this, "Getting Data...",
"Plz Wait....");
dialog.setCancelable(true);
dialog.show();
}

@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
listObj = parser.getList(mUrl);
return null;
}

@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (listObj != null && listObj.size() != 0) {
// Log.e("MyLog", movielistArray.toString());
list.setAdapter(mAdapter);
}
dialog.dismiss();
}
}

class MyAdapter extends BaseAdapter {

TextView name;

public int getCount() {
// TODO Auto-generated method stub
return listObj.size();
}

public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}

public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}

public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View v = convertView;
LayoutInflater inf = (LayoutInflater) getSystemService(ListActivity.LAYOUT_INFLATER_SERVICE);

v = inf.inflate(R.layout.row, null);
name = (TextView) v.findViewById(R.id.name);
name.setText(listObj.get(position).getName());
return v;
}

}
}

// PARSING CLASS

package com.parsing;

import java.util.ArrayList;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import android.util.Log;

public class Parsing {

private static final String TAG = "SearchResultsParser";

Pojo data_pojo;

ArrayList<Pojo> dataArray1 = new ArrayList<Pojo>();

// method to parse the given JSON object by taking the url of the JSON as

// argument

public ArrayList<Pojo> getList(String url) {

url = url.replace(" ", "%20");

try {

ServiceHandler sh = new ServiceHandler();

// Making a request to url and getting response

String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

Log.d("Response: ", "> " + jsonStr);

if (jsonStr != null) {

JSONObject json = new JSONObject(jsonStr);

JSONArray array1 = json.getJSONArray("list");

for (int i = 0; i < array1.length(); i++) {

JSONObject jsonObject1 = null;

try {

jsonObject1 = array1.getJSONObject(i);

data_pojo = new Pojo(jsonObject1.getString("name"));

dataArray1.add(data_pojo);

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Log.d("array size>>>>>>>>>>>", "Date"

+ dataArray1.get(0).getName());

Log.d("array size>>>>>>>>>>>", dataArray1.size() + "");

}

} catch (Exception e) {

Log.d(TAG, e.toString());

}

return dataArray1;

}

//POJO CLASS

package com.parsing;

public class Pojo {

private String name;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Pojo(String name) {

this.name = name;

}

// SERVICE HANDLER Class

package com.parsing;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.List;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.client.utils.URLEncodedUtils;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

public class ServiceHandler {

static String response = null;

public final static int GET = 1;

public final static int POST = 2;

public ServiceHandler() {

}

/**

* Making service call

* @url - url to make request

* @method - http request method

* */

public String makeServiceCall(String url, int method) {

return this.makeServiceCall(url, method, null);

}

/**

* Making service call

* @url - url to make request

* @method - http request method

* @params - http request params

* */

public String makeServiceCall(String url, int method,

List<NameValuePair> params) {

try {

// http client

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpEntity httpEntity = null;

HttpResponse httpResponse = null;

// Checking http request method type

if (method == POST) {

HttpPost httpPost = new HttpPost(url);

// adding post params

if (params != null) {

httpPost.setEntity(new UrlEncodedFormEntity(params));

}

httpResponse = httpClient.execute(httpPost);

} else if (method == GET) {

// appending params to url

if (params != null) {

String paramString = URLEncodedUtils

.format(params, "utf-8");

url += "?" + paramString;

}

HttpGet httpGet = new HttpGet(url);

httpResponse = httpClient.execute(httpGet);

}

httpEntity = httpResponse.getEntity();

response = EntityUtils.toString(httpEntity);

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return response;

}

//List XML Layout

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

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<ListView

android:id="@+id/listView"

android:layout_width="match_parent"

android:layout_height="wrap_content" >

</ListView>

</LinearLayout>

// row XML layout

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

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:padding="5dp" >

<TextView

android:id="@+id/name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="row name"

android:textSize="18sp"

android:textColor="#ff1100" />

</LinearLayout>

//ManifestFILE

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

package="com.example.testapp"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="15" />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.example.testapp.ListActivity"

android:label="@string/title" >

<intent-filter>

</intent-filter>

</activity>

</application>

<uses-permission android:name="android.permission.INTERNET" />

</manifest>

Androidide

Monday, April 28, 2014

Simple JSON parsing