Develop Reference

JSONParser getting complete JSON file With curly brackets

i am trying to implement sample JSON data App that Gets JSON data from server
i am Getting complete JSON file whats wrong with my coding ?
i am following an youtube tutorial but he did successfully but i am getting complete JSON File
this is JSON server side file
{
"movies" :[
{
"movie" : "Avenger",
"year" : 2012
}
]
}
and this is code from android app
package com.yog.jsonparser;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.URLUtil;
import android.widget.Button;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URL;
public class MainActivity extends AppCompatActivity {
TextView tvData;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnHit = (Button) findViewById(R.id.btnHit);
tvData = (TextView)findViewById(R.id.tvJsonItem);
btnHit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JSONTask().execute("http://myDomainName.com/getData.txt");
}
});
}
public class JSONTask extends AsyncTask<String,String,String>{
HttpURLConnection connection = null;
BufferedReader reader = null;
URI url;
StringBuffer buffer;
#Override
protected String doInBackground(String... params){
try{
//URL OF REQUESTED PAGE
url=new URI(params[0]);
connection = (HttpURLConnection) (new URL(params[0]).openConnection());
connection.connect();
InputStream stream=connection.getInputStream();
reader=new BufferedReader(new InputStreamReader(stream));
buffer=new StringBuffer();
String line;
while((line =reader.readLine())!=null){
buffer.append(line);
}
String finalJSON=buffer.toString();
JSONObject parentOject = new JSONObject(finalJSON);
JSONArray parentArray = parentOject.getJSONArray("movies");
JSONObject finalObject= parentArray.getJSONObject(0);
String movieName= finalObject.getString("movie");
int year=finalObject.getInt("year");
return movieName + "-" + year;
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if(connection !=null){
connection.disconnect();
}
try{
if(reader !=null){
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
tvData.setText(buffer.toString());
}
}
}
current Output :
{"movies" :[{ "movie" : "Avenger","year" : 2012}]}
Expected output :
Avenger
2012

Change your onPostExecute method as below.
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
tvData.setText(s);
}
Here s will be return statement of doInBackground. "movieName + "-" + year;"

You are getting {"movies" :[{ "movie" : "Avenger","year" : 2012}]} in the TextView because you are setting the buffer's output to the TextView. Change your onPostExecute like this:
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if(s != null){
tvData.setText(s);
}else{
//// Some error occurred
tvData.setText(buffer.toString());
}
}

how to extract html code from webview

this is my code ...... i cant resolve the error..
import java.io.IOException;
import java.net.URI;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;
import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.webkit.WebViewClient;
#SuppressLint("SetJavaScriptEnabled")
public class Social_media extends Fragment {
private String getDownloadButtonOnly(String url){
URI http ;
HttpGet pageGet = new HttpGet ( "http://visiblenews.com/category/gadgets/");
ResponseHandler<String> handler = new ResponseHandler<String>() {
public String handleResponse1(HttpResponse response) throws ClientProtocolException, IOException {
HttpEntity entity = response.getEntity();
String html;
if (entity != null) {
html = EntityUtils.toString(entity);
return html;
}else {
return null;
}
}
#Override
public String handleResponse(HttpResponse response)
throws ClientProtocolException, IOException {
// TODO Auto-generated method stub
return null;
}
};
Object pageHTML = null;
try {
while (pageHTML==null){
Object client;
pageHTML = ((Object) client).execute(pageGet, handler);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Pattern pattern = Pattern.compile("<h2>Direct Down.+?</h2>(</div>)*(.+?)<.+?>", Pattern.DOTALL);
Matcher matcher = pattern.matcher((CharSequence) pageHTML);
String displayHTML = null;
while(matcher.find()){
displayHTML = matcher.group();
}
return displayHTML;
}
public void customizeWebView(final ServiceCommunicableActivity activity, final WebView webview, final SearchResult mRom) {
mRom.setFileSize(getFileSize(mRom.getURLSuffix()));
webview.getSettings().setJavaScriptEnabled(true);
}
private Object getFileSize(Object urlSuffix) {
// TODO Auto-generated method stub
return null;
}};
error log is ..
Description Resource Path Location Type
The method execute(HttpGet, ResponseHandler) is undefined for the type Object Social_media.java /TabsWithSwipeGesture/src/info/androidhive/tabsswipe line 62 Java Problem

Object has no execute() method. You are supposed to use a HttpClient instance. Further I wonder what you want with pageHtml (and the loop there) as the html page will be availabel in `handleResponse'. Further the title of your post is strange as there is no WebView involved here.

AsyncTask unfortunately stops on second execution

I'm trying to get strings from my Arduino with my Android phone, everything goes well except for when I press my updatebutton the second time, it unfortunately stops.
I can't seem to track the problem and I ran out of options so I'm asking for help to you guys now.
package com.TRY.udp2;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
private String rcvStr, serverIP="192.168.0.15";
private TextView textLog;//Log for outputs
private EditText textMsg;
Button updateButton;//(dis)connect Button
Boolean connected=false;//stores the connectionstatus
DataOutputStream dataOutputStream = null;//outputstream to send commands
Socket socket = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button updateButton = (Button) findViewById(R.id.updateButton);
textMsg = (EditText) findViewById(R.id.textMsg);
textLog = (TextView) findViewById(R.id.textLog);
updateButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String textlogMsg = textMsg.getText().toString();
new synchTask().execute(textlogMsg);
}
});
}
private class synchTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
String msg=params[0].toString();
InetAddress toAddress = null;
try
{
toAddress = InetAddress.getByName(serverIP);
}
catch (UnknownHostException e)
{
e.printStackTrace();
}
int port=5000;
DatagramSocket dtSocket = null;
try
{
dtSocket = new DatagramSocket(port);
}
catch (SocketException e1)
{
e1.printStackTrace();
}
byte[] dataBytes = msg.getBytes();
DatagramPacket sndPacket = new DatagramPacket(dataBytes, dataBytes.length, toAddress, port);
try
{
dtSocket.send(sndPacket);
}
catch (IOException e)
{
e.printStackTrace();
}
try
{
byte[] rcvData = new byte[1024];
DatagramPacket rcvPacket = new DatagramPacket(rcvData, rcvData.length);
dtSocket.receive(rcvPacket);
rcvStr = new String(rcvPacket.getData());
}
catch (IOException e)
{
e.printStackTrace();
}
return rcvStr;
}
protected void onPostExecute(String result) {
textLog.setText(rcvStr);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
and if there's a better way of getting strings from arduino please help out.

You probably need to close dtSocket at the end of doInBackground(). Otherwise you will try to create a socket on a bound port when you execute it the second time.

getByName in POST HTTP request

I'm trying to get the ip address of a host name then use it in the POST Http request URL i'm sending to
everything was working find and after adding the getByName line it suddenly crashed
So please help me and tell me exactly what could be the problem ?
Thank you in advance
Logindb.java
package com.example.loginad;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Logindb extends Activity {
Button login;
EditText u,p;
TextView res;
String result;
String x="mobile";
String host="";
Thread mBack;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.logindb);
login=(Button)findViewById(R.id.login);
u=(EditText)findViewById(R.id.u);
p=(EditText)findViewById(R.id.p);
res=(TextView)findViewById(R.id.res);
mBack = new Thread(new Runnable()
{
public void run()
{
try
{
InetAddress address=null;
address = InetAddress.getByName("Osama-PC");
host=address.getHostAddress();
}
catch(Exception e)
{
e.printStackTrace();
}
}
});
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new MyAsyncTask().execute(u.getText().toString(),p.getText().toString());
}
});
}
private class MyAsyncTask extends AsyncTask<String, Integer, Boolean>{
#Override
protected Boolean doInBackground(String... params) {
// TODO Auto-generated method stub
boolean success = postData(params[0],params[1]);
return success;
}
protected void onPostExecute(Boolean localres){
if (localres){
res.setText("A Correct Username and Password");
}else{
res.setText("Incorrect Username or Password");
}
Toast.makeText(getApplicationContext(), "command sent", Toast.LENGTH_LONG).show();
}
protected void onProgressUpdate(Integer... progress){
//pb.setProgress(progress[0]);
//Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_LONG).show();
}
public Boolean postData(String a,String b) {
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("username", a));
postParameters.add(new BasicNameValuePair("password", b));
postParameters.add(new BasicNameValuePair("mobileid",x));
// String valid = "1";
String response = null;
try {
// Toast.makeText(getApplicationContext(), host.toString(), Toast.LENGTH_LONG).show();
response = CustomHttpClient.executeHttpPost("http://"+host+"/new/check.php",postParameters);
//now in result you will have the response from php file either 0 or 1.
result = response.toString();
// res = res.trim();
result = result.replaceAll("\\s+", "");
// error.setText(res);
} catch (Exception e) {
//res.setText(e.toString());
}
return "1".equals(result);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.logindb, menu);
return true;
}
}

Line 130:
Change return null; to return false;
Or something smarter would be to change
if(result!=null)
{
return result.equals("1");
}
else
{
return null;
}
to
return "1".equals(result);

Struggling to Download Files using Android Eclipse?

I am struggling to make a simple app to download files of the internet heres my code I have edited a little from another question but I am still getting not responding errors whenever I run my app can any one show me the correction or even a different way?
package com.example.downloading;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.ResultReceiver;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.app.DownloadManager;
import android.app.IntentService;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
public class MainActivity extends Activity {
Button startBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startBtn = (Button)findViewById(R.id.download_button);
startBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
String url = "my stuff";
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setDescription("descrition");
request.setTitle("title");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "etc.mp3");
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
});
}
}

public void DownLoadTheMusic(){
try {
URL url = new URL("http://www.tagsinfosoft.com/android/shelf/Shelf_Cam.mp3");
HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
String PATH = Environment.getExternalStorageDirectory() + "/download/";
File file = new File(PATH);
file.mkdirs();
File outputFile = new File(file, "Shelf_Cam.mp3");
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
} catch (IOException e) {
Toast.makeText(getApplicationContext(), "Update error!", Toast.LENGTH_LONG).show();
}
}
call this in a Asynctask
public class downloadMusic extends AsyncTask<Integer, Integer, Integer>
{
#Override
protected Integer doInBackground(Integer... params) {
// TODO Auto-generated method stub
try {
DownLoadTheMusic();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Integer result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Context context=shelf.this;
pd.dismiss();
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/" + "Shelf_Cam.mp3")), "application/vnd.android.package-archive");
startActivity(intent);
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pd=ProgressDialog.show(shelf.this,"Updating","Please wait....." );
}
}
execute this task onbutton click use this if you are downloading small music file from internet.