<?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="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/listitem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#f9c045"
android:textSize="13sp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
/>
</RelativeLayout>
for fetching the data we need to write one class file for GET and POST method to access JSON objects from Server.
JSONGet.java
package com.im.json;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
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.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONStudentParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONStudentParser() {
}
public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
Log.e("JSON", json);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
package com.im.json;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.im.json.JSONGet;
public class Result extends Activity {
ListView list;
ArrayList<HashMap<String, String>> reslist = new ArrayList<HashMap<String, String>>();
private static String url = "http://localhost:8080/json.php"; //change to your server url
private static final String TAG_RESULT = "updates";
private static final String TAG_NAME = "mark"; //JSON tag name
JSONArray android = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main.xml);
getActionBar().setDisplayHomeAsUpEnabled(true); // for up navigation
reslist = new ArrayList<HashMap<String, String>>();
new parsedata().execute()
}
private class parsedata extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONStudentParser jParser1 = new JSONStudentParser();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("no_parameter","")); //here we do not want want to fetch data on such condition hence parameter will be blank.
JSONObject json = jParser1.getJSONFromUrl(url, params);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
android = json.getJSONArray(TAG_RESULT);
for(int i = 0; i < android.length(); i++){
JSONObject c = android.getJSONObject(i);
String name = c.getString(TAG_NAME);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_NAME, name);
reslist.add(map);
list=(ListView)findViewById(R.id.toplist);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, reslist,
R.layout.listview_item,
new String[] { TAG_NAME }, new int[] {R.id.listitem});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
