Json parser example with listview - Get responce from URL

Below are your code snippets for this

	<?xml version="1.0" encoding="utf-8"?>
	<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="com.mihir.jsonprectice"
	android:versionCode="1"
	android:versionName="1.0" >
	<uses-sdk
	android:minSdkVersion="8"
	android:targetSdkVersion="16" />
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
	<uses-permission android:name="android.permission.INTERNET"/>
	<application
	android:allowBackup="true"
	android:icon="@drawable/ic_launcher"
	android:label="@string/app_name"
	android:theme="@style/AppTheme" >
	<activity
	android:name="com.mihir.jsonprectice.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>

view raw AndroidManifest.xml hosted with ❤ by GitHub

	import android.annotation.SuppressLint;
	import android.content.Context;
	import android.content.DialogInterface;
	import android.content.Intent;
	import android.net.ConnectivityManager;
	import android.net.NetworkInfo;
	import android.net.wifi.WifiManager;
	import android.os.StrictMode;
	import android.util.Log;
	import com.google.api.client.http.HttpResponse;
	import java.io.BufferedReader;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import okhttp3.internal.http.StatusLine;
	public class JsonParser {
	/**
	* @param inputstream
	* @return string value
	* @author Mihir
	* @descriptions used to convert inputstream to string
	*/
	@SuppressLint("NewApi")
	public String InputStreamToString(InputStream inputstream) {
	StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
	StrictMode.setThreadPolicy(policy);
	StringBuilder mStringBuilder = new StringBuilder();
	try {
	if (inputstream != null) {
	BufferedReader mBufferedReader = new BufferedReader(new InputStreamReader(inputstream), 8);
	String line = "";
	while ((line = mBufferedReader.readLine()) != null) {
	mStringBuilder.append(line + "\n");
	}
	inputstream.close();
	return mStringBuilder.toString();
	}
	return null;
	} catch (Exception e) {
	e.printStackTrace();
	return null;
	}
	}
	/**
	* @param context
	* @param URL
	* @param cookies
	* @return InputStream
	* @author Mihir
	* @description user to get json from URL
	*/
	public Object[] HTTP_GET(String url, String cookies) {
	Object object[] = new Object[3];
	// DefaultHttpClient
	HttpClient mHttpClient = new DefaultHttpClient();
	try {
	//Log.d("URL", url);
	HttpGet mHttpGet = new HttpGet(url);
	if (cookies != null) {
	mHttpGet.setHeader("Cookies", cookies);
	}
	HttpResponse mHttpResponse = mHttpClient.execute(mHttpGet);
	object[0] = getResponseStatusCode(mHttpResponse);
	object[1] = getResponseStatusMessage(mHttpResponse);
	HttpEntity mHttpEntity = mHttpResponse.getEntity();
	object[2] = mHttpEntity.getContent();
	// or
	// object[0] = mHttpResponse.getStatusLine().getStatusCode();
	// object[1] = mHttpResponse.getStatusLine().getReasonPhrase().toString();
	// object[2] = mHttpResponse.getEntity().getContent().toString();
	return object;
	} catch (Exception e) {
	e.printStackTrace();
	return null;
	}
	}
	/**
	* @param response
	* @return ResponseCode
	* @author Mihir
	* @description use to get http response code
	*/
	public int getResponseStatusCode(HttpResponse response) {
	StatusLine statusLine = response.getStatusLine();
	Log.d("STATUS_Message", statusLine.getReasonPhrase().toString());
	return statusLine.getStatusCode();
	}
	/**
	* @param response
	* @return ResponseMessage
	* @author Mihir
	* @description use to get http response code
	*/
	public String getResponseStatusMessage(HttpResponse response) {
	StatusLine statusLine = response.getStatusLine();
	return statusLine.getReasonPhrase().toString();
	}
	/**
	* @param Context context
	* @param String errMsg
	* @author mihir
	* @description shows services error massage
	*/
	public static final void errorDialogMsg(Context context, String errMsg) {
	errMsg = android.text.Html.fromHtml(errMsg).toString();
	AlertDialog.Builder builder = new Builder(context);
	builder.setTitle("Error");
	builder.setMessage(errMsg);
	builder.create();
	builder.setPositiveButton("OK", new OnClickListener() {
	@Override
	public void onClick(DialogInterface dialog, int which) {
	dialog.dismiss();
	}
	});
	builder.show();
	}
	/**
	* @param context
	* @param message
	* @return
	* @author Mihir
	* @description use to check internet newtwork connection
	* if network connection not available than alert for open network settings
	*/
	public static boolean isOnline(final Context context, boolean message) {
	ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	NetworkInfo netInfo = mConnectivityManager.getActiveNetworkInfo();
	if (netInfo != null) {
	if (netInfo.isConnectedOrConnecting()) {
	return true;
	}
	}
	if (message) {
	AlertDialog.Builder builder = new AlertDialog.Builder(context);
	builder.setMessage("Please check your network connection");
	builder.setCancelable(false);
	builder.setPositiveButton("Network Settings", new DialogInterface.OnClickListener() {
	@Override
	public void onClick(DialogInterface dialog, int which) {
	context.startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));
	}
	});
	builder.setNegativeButton("Wifi Settings", new DialogInterface.OnClickListener() {
	@Override
	public void onClick(DialogInterface dialog, int which) {
	context.startActivity(new Intent(new Intent(WifiManager.ACTION_PICK_WIFI_NETWORK)));
	}
	});
	AlertDialog alert = builder.create();
	alert.show();
	return false;
	}
	return false;
	}
	}

view raw JsonParser.java hosted with ❤ by GitHub

	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.BaseAdapter;
	import android.widget.TextView;
	public class ListAdepter extends BaseAdapter {
	private LayoutInflater mLayoutInflater = null;
	public ListAdepter() {
	mLayoutInflater = LayoutInflater.from(MainActivity.this);
	}
	@Override
	public int getCount() {
	return mArrayListCity.size();
	}
	@Override
	public Object getItem(int position) {
	return null;
	}
	@Override
	public long getItemId(int position) {
	return 0;
	}
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	if (convertView == null) {
	convertView = mLayoutInflater.inflate(R.layout.row_item, null);
	}
	TextView tv_list_item = (TextView) convertView.findViewById(R.id.tv_list_item);
	tv_list_item.setText(mArrayListCity.get(position));
	return convertView;
	}
	}

view raw ListAdepter.java hosted with ❤ by GitHub

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:orientation="vertical">
	<ListView
	android:id="@+id/listView1"
	android:layout_width="match_parent"
	android:layout_height="wrap_content" />
	</LinearLayout>

view raw main.xml hosted with ❤ by GitHub

	import android.app.Activity;
	import android.app.ProgressDialog;
	import android.os.AsyncTask;
	import android.os.Bundle;
	import android.util.Log;
	import android.widget.ListView;
	import android.widget.Toast;
	import org.json.JSONArray;
	import org.json.JSONException;
	import org.json.JSONObject;
	import java.io.InputStream;
	import java.util.ArrayList;
	public class MainActivity extends Activity {
	private ListView roleList = null;
	private ListAdepter mListAdepter = null;
	private ArrayList<String> mArrayListCity = null;
	private JsonParser mJsonParser = new JsonParser();
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	mArrayListCity = new ArrayList<String>();
	roleList = (ListView) findViewById(R.id.listView1);
	mListAdepter = new ListAdepter();
	roleList.setAdapter(mListAdepter);
	}
	@Override
	protected void onResume() {
	super.onResume();
	ClearArray();
	if (JsonParser.isOnline(MainActivity.this, true)) {
	new CityJson().execute("Get City");
	}
	}
	private void ClearArray() {
	mArrayListCity.clear();
	}
	private class CityJson extends AsyncTask<String, Void, Object[]> {
	ProgressDialog mDialog = new ProgressDialog(MainActivity.this);
	@Override
	protected void onPreExecute() {
	mDialog.show();
	mDialog.setCancelable(false);
	mDialog.setCanceledOnTouchOutside(false);
	mDialog.setMessage("Please wait while loading....");
	super.onPreExecute();
	}
	@Override
	protected Object[] doInBackground(String... params) {
	//passing Json URL
	String url = "http://api.geonames.org/citiesJSON?north=44.1&amp;south=-9.9&amp;east=-22.4&amp;west=55.2&amp;lang=de&amp;username=demo";
	//Get the HTTP response and return an object as result
	return mJsonParser.HTTP_GET(url, null);
	}
	@Override
	protected void onPostExecute(Object[] mObject) {
	super.onPostExecute(mObject);
	mDialog.dismiss();
	try {
	if (mObject != null) {
	if ((Integer) mObject[0] == 200) {
	String response = mJsonParser.InputStreamToString((InputStream) mObject[2]);
	Log.d("City list Response", response);
	if (response != null) {
	JSONObject mJsonObject = new JSONObject(response);
	JSONArray mJsonArray = mJsonObject.getJSONArray("geonames");
	JSONObject mJsonObject2 = new JSONObject();
	for (int i = 0; i < mJsonArray.length(); i++)
	{
	mJsonObject2 = mJsonArray.getJSONObject(i);
	mArrayListCity.add(mJsonObject2.getString("toponymName"));
	}
	mListAdepter.notifyDataSetChanged();
	} else {
	Toast.makeText(MainActivity.this, "Server error occored.\nPlease, try after some time. ", Toast.LENGTH_SHORT).show();
	}
	} else {
	JsonParser.errorDialogMsg(MainActivity.this, (String) mObject[1]);
	}
	}
	} catch (JSONException e) {
	e.printStackTrace();
	}
	}
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub

	<?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" >
	<TextView
	android:id="@+id/tv_list_item"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:padding="10dp"
	android:text="@string/item"
	android:textSize="20sp" />
	</LinearLayout>

view raw row.xml hosted with ❤ by GitHub