Develop Reference

Android java json url from dropbox

I have this piece of code on android that reads data from Assets folder, so I need from this code to read data from external like dropbox. Ho to change and read data from dropbox. thanks
#Override
protected RadioDatas doInBackground(Void... params) {
BufferedReader reader = null;
ArrayList<RadioData> radioDatas = new ArrayList<>();
RadioDatas datas = new RadioDatas();
try {
reader = new BufferedReader(
new InputStreamReader(context.getAssets().open("url.txt"), "Unicode"));
String mLine;
while ((mLine = reader.readLine()) != null) {
RadioData radioData = new RadioData();
String[] meta = mLine.split(";");
radioData.setUrl(meta[0]);
radioData.setTitle(meta[1]);
radioData.setGenres(meta[2]);
radioDatas.add(radioData);
}
} catch (IOException e) {
//log the exception
return null;
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
//log the exception
}
}
}
datas.setRadioDatas(radioDatas);
return datas;
}

This would work....
public class Execute extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler handler = new HttpHandler();
String jsonString = handler.makeServiceCall(json);
if (jsonString != null) {
try {
//parse jsonString
} catch (JSONException e) {
Log.i("Error with parsing", e.getMessage());
}
}
return null;
}
protected void onPostExecute(Void result) {
super.onPostExecute(result);
}
}
You will need a HTTPHandler class...
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
in.close();
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
To run it.
new Execute().execute;

Android App Crashes if no internet during server connection

I am calling a url to fetch data and insert in my database. I have provided a no internet check. If I open the app without internet connection, it works fins, a pop up comes.. But if I connect to the url when I have internet and the internet goes in middle the process, my app crashes, How to fix it?
My code:
public class DoPOSTPen extends AsyncTask<String, Void, Boolean> implements OnCancelListener {
#SuppressWarnings("deprecation")
#Override
protected Boolean doInBackground(String... arg0) {
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet("http://testapi.pharmeazy.in/api/MediEazy/GetAllInvoices");
request.addHeader("Authorization", " basic NDlyaWNva2pvaWQwM2ptZGlraWRES09qZGZpamRmNzY0dDA4NWp6MzcyOHdzMkpJS1M4MTA0c2NvcTJ1OTRkazphd0VEMzI3MkA4WWFzZEU3MjI3IUBeIypVSFMq");
request.setHeader(HTTP.CONTENT_TYPE, "application/json");
System.out.println("PRIINTING");
HttpResponse response = null;
try {
response = client.execute(request);
Log.d("Response of GET request", response.toString());
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InputStream inputStream = response.getEntity().getContent();
String result = Utils.convertInputStreamToString(inputStream);
System.out.println("server response is :" + result + "\n" + inputStream);
try {
ja=new JSONArray(result);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
catch (Exception e) {
Log.e("ClientServerDemo", "Error:", e);
toastText2 = "Connection Error !";
}
return true;
}
protected void onPreExecute() {
//display the progress dialog
mProgressHUD2 = ProgressHUD.show(Med.this,"Getting Rejected Orders", true,false,this);
}
#Override
protected void onPostExecute(Boolean valid) {
mProgressHUD2.dismiss();
// if server response is successful
for(int i=0;i<ja.length();i++){
try {
jo=ja.getJSONObject(i);
db.insertLabel(jo.get("Id").toString(), jo.get("CustomerId").toString(), jo.get("PharmacyId").toString(),
jo.get("DeliveryAddress").toString(), jo.get("DeliveryName").toString(),
jo.get("OrderStatus").toString(),jo.get("PrescriptionAttached").toString(),jo.get("Discount").toString());
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
new DoPOST3().execute();
}
Please help

why you don't go for httpurlconection
#Override
protected String doInBackground(String... params) {
String finalResult = null;
URL url = null;
HttpsURLConnection urlConnection = null;
try {
url=new URL(URL);
urlConnection = (HttpsURLConnection) url.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setRequestMethod("POST");
urlConnection.setUseCaches(false);
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
urlConnection.setRequestProperty("Content-Type","application/json");
urlConnection.connect();
OutputStreamWriter out = new OutputStreamWriter(urlConnection.getOutputStream());
out.write(jsonObjSend.toString());
out.close();
starttime = System.currentTimeMillis();
try {
mResponseCode = urlConnection.getResponseCode();
totaltime = System.currentTimeMillis() - starttime;
Log.e("HTTP POST Response Code:", ""
+ mResponseCode);
} catch (SSLPeerUnverifiedException e) {
Log.e("Exception", Log.getStackTraceString(e));
} catch (IOException e) {
Log.e("Exception", Log.getStackTraceString(e));
Log.e("HTTP POST Response Code(2):", ""
+ mResponseCode);
}
}
check before calling asynctask
if(Util.haveNetworkConnection(this))
{
HttpPostData req=new HttpPostData(URL, createJsonObject(),this) ;
req.execute();
}

Authentication not working in Put method android

How to get response in put method with Authentication using four Headers.In ios it works fine but not in Android.
Authentication code is generated from the data HMAC-SHA256 with the secret key provided after validation as the key
HttpPut put = new HttpPut(xAuthurl);//url
Log.v("put", "" + put);
try {
put.setEntity(new StringEntity(data, "UTF-8"));
} catch (UnsupportedEncodingException e1) {
Log.e(TAG, "UnsupportedEncoding: ", e1);
}
//Here are the four headers......
put.addHeader("Content-type", "application/json");
put.addHeader("x-Auth-user", Validation.id);//id of the profile
put.addHeader("X-Auth-Hash", hexBytes);// Hexadecimal value
put.addHeader("X-Auth-Time", sdf.format(datetime));//date format in utc
HttpResponse response = null;
try {
response = http.execute(put);
Log.v("response", "" + response.getAllHeaders());
} catch (ClientProtocolException e1) { // TODO Auto-generated catch
// block
e1.printStackTrace();
} catch (IOException e1) { // TODO
// Auto-generated catch block
e1.printStackTrace();
}
Log.d(TAG, "This is what we get back:"
+ response.getStatusLine().toString() + ", "
+ response.getEntity().toString());
try {
inputStream = response.getEntity().getContent();
} catch (IllegalStateException e1) { // TODO Auto-generated catch
// block
e1.printStackTrace();
} catch (IOException e1) { // TODO Auto-generated catch block
e1.printStackTrace();
}
if (inputStream != null) {
try {
result = convertInputStreamToString(inputStream);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.v("result", "" + result);
} else {
result = "Did not work!";
}
return 1;
}
private String convertInputStreamToString(InputStream inputStream)
throws IOException {
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(inputStream));
String line = "";
String result = "";
while ((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
}
result i get is {"Message":"An error has occurred."}

fetching the values from web api to andorid spinner

here my code for fetching values from web api. in my code no error is there. but in emulator doesn't show the values. please tell me where i done a mistake. let me know what is the correct code for that.
public class MainActivity extends ActionBarActivity {
Spinner sp1;
String url1=" http://www.cartrade.com/testmobileapplication/GetTopCitiesList.php? app_id=<random number>&action=Get Cities";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Spinner sp1=(Spinner)findViewById(R.id.spinner1);
}
public class Mysync extends AsyncTask<List<String>, List<String>, List<String>>{
#Override
protected List<String> doInBackground(List<String>... arg0) {
// TODO Auto-generated method stub
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(url1);
// Execute the request
HttpResponse response;
JSONArray arr = new JSONArray();
try {
response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
if (entity != null && response.getStatusLine().getStatusCode() == 200) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
String result = convertStreamToString(instream);
arr=new JSONArray(result);
instream.close();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
// Log.e(TAG,e.toString());
} catch (IOException e) {
// TODO Auto-generated catch block
// Log.e(TAG,e.toString());
} catch (JSONException e) {
// TODO Auto-generated catch block
//Log.e(TAG,e.toString());
}
List<String> list = new ArrayList<String>();
for(int i = 0; i < arr.length(); i++){
try {
list.add(arr.getJSONObject(i).getString("name"));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return list;
}
protected void onPostExecute(List<String> result){
sp1=(Spinner)findViewById(R.id.spinner1);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), R.layout.support_simple_spinner_dropdown_item);
sp1.setAdapter(adapter);
}
}
public String convertStreamToString(InputStream is) {
// TODO Auto-generated method stub
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
// Log.e(TAG + "ERROR",e.toString());
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
// Log.e(TAG + "ERRO",e.toString());
}
}
return sb.toString();
}
}

Define List under the line
String url1=" http://www.cartrade.com/testmobileapplication/GetTopCitiesList.php? app_id=&action=Get Cities";
like : List<String> list ;
And Try to Change the line
List list = new ArrayList();
Via
list = new ArrayList();
and Change
ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), R.layout.support_simple_spinner_dropdown_item);
Via
ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), R.layout.support_simple_spinner_dropdown_item,result);
Hope this may help you!

Android Socket: Read Continuous Data

I am trying to read data continuously using the following code:
public class MyClientTask extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
String response = "";
MyClientTask(String addr, int port){
dstAddress = addr;
dstPort = port;
}
#Override
protected Void doInBackground(Void... arg0) {
Socket socket = null;
try {
socket = new Socket(dstAddress, dstPort);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int bytesRead;
InputStream inputStream = socket.getInputStream();
while ((bytesRead = inputStream.read(buffer)) != -1){
readInpt = inputStream.toString();
byteArrayOutputStream.write(buffer, 0, bytesRead);
response = byteArrayOutputStream.toString("UTF-8");
}
textResponse.setText(readInpt);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "UnknownHostException: " + e.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "IOException: " + e.toString();
}finally{
if(socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
#Override
protected void onPostExecute(Void result) {
textResponse.setText(response);
super.onPostExecute(result);
}
}
But for some reason, it doesn't show me any output in the textbox. any help would be appreciated.

There are at least two issues in your code.
Frist, I'm not sure the method toString() on the inputStream is going to work, because the documentation says it returns a description of the object (which would be different than the string recieved). You might be confusing this with the contents of buffer which might be what you really want.
readInpt = inputStream.toString(); // Probably wrong
Second. You're updating the User Interface from a background thread, inside doInBackground() , which is always forbidden.
textResponse.setText(readInpt); // Forbidden, move somewhere else, e.g. onPostExecute()

try {
socket = new Socket(dstAddress, dstPort);
BufferedReader stdIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while (true) {
response = stdIn.readLine();
publishProgress(response);
Log.i("response", response);
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "UnknownHostException: " + e.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "IOException: " + e.toString();
}
catch (Exception e) {
e.printStackTrace();
}
You cannot print it on text field because the socket will listen to the server socket.If server socket does not send any response it will listen to the socket continuously until the response is received.