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;

How to change from Get Json Raw File to Get Json Url?

I have a code that works fine: Get Json from raw file (raw/video_list.json)
public class VideoListFragment extends BaseListFragment {
VideoAdapter adapter;
#Override
protected RecyclerView.Adapter getAdapter() {
if (adapter == null) {
String jsonStr = readRawFile();
Gson gson = new Gson();
VideoPage videoPage = gson.fromJson(jsonStr, VideoPage.class);
adapter = new VideoAdapter(videoPage);
}
return adapter;
}
String readRawFile() {
String content = "";
Resources resources = getContext().getResources();
InputStream is = null;
try {
is = resources.openRawResource(R.raw.video_list);
byte buffer[] = new byte[is.available()];
is.read(buffer);
content = new String(buffer);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return content;
}
}
Now I want to get Json from Url,I copy Json in the video_list.json file to myjson.com and then get the url (https://api.myjson.com/bins/uyzbl), I change code:
public class VideoListFragment extends BaseListFragment {
VideoAdapter adapter;
#Override
protected RecyclerView.Adapter getAdapter() {
if (adapter == null) {
String jsonStr = readData("https://api.myjson.com/bins/71535");
Gson gson = new Gson();
VideoPage videoPage = gson.fromJson(jsonStr, VideoPage.class);
adapter = new VideoAdapter(videoPage);
}
return adapter;
}
String readData(String url) {
HttpsURLConnection con = null;
try {
URL u = new URL(url);
con = (HttpsURLConnection) u.openConnection();
con.connect();
BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
br.close();
return sb.toString();
} catch (MalformedURLException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
if (con != null) {
try {
con.disconnect();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
return null;
}
}
No errors occurred in Android Studio but App unfortunately, app has stopped. Can you help me find and fix it?

method execute in AsyncTask does not work with String

I try to execute an AsyncTask like this
private static final String REQUESTED_URL = "//my url";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.earthquake_activity);
EarthQuakeAsyncTask task = new EarthQuakeAsyncTask();
task.execute(REQUESTED_URL); //this is where the error is
}
but Android Studio said that it cannot resolve method execute(String). I'm having a tutorial from Udacity, their sample is pretty much similar
/** URL for earthquake data from the USGS dataset */
private static final String USGS_REQUEST_URL =
"//url";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EarthquakeAsyncTask task = new EarthquakeAsyncTask();
task.execute(USGS_REQUEST_URL); //it works
}
Can someone tell me why this possibly occurs?
Edit: this is my EarthQuakeAsyncTask class:
private class EarthQuakeAsyncTask extends AsyncTask<URL,Void,ArrayList<EarthQuake>> {
#Override
protected ArrayList<EarthQuake> doInBackground(URL... urls) {
if(urls.length==0||urls[0]== null){
return null;
}
// Create URL object
URL url = createUrl(REQUESTED_URL);
try {
jsonResponse = makeHttpRequest(url);
} catch (IOException e) {
// TODO Handle the IOException
}
ArrayList<EarthQuake> earthquake = QueryUtils.extractEarthquakes(jsonResponse);
return earthquake;
}
#Override
protected void onPostExecute(ArrayList<EarthQuake> earthquake) {
if (earthquake == null) {
return;
}
updateUi();
}
private URL createUrl(String stringUrl) {
URL url;
try {
url = new URL(stringUrl);
} catch (MalformedURLException exception) {
Log.e(LOG_TAG, "Error with creating URL", exception);
return null;
}
return url;
}
private String makeHttpRequest(URL url) throws IOException {
// If the URL is null, then return early.
if (url == null) {
return jsonResponse;
}
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// If the request was successful (response code 200),
// then read the input stream and parse the response.
if (urlConnection.getResponseCode() == 200) {
inputStream = urlConnection.getInputStream();
jsonResponse = readFromStream(inputStream);
} else {
Log.e(LOG_TAG, "Error response code: " + urlConnection.getResponseCode());
}
} catch (IOException e) {
Log.e(LOG_TAG, "Problem retrieving the earthquake JSON results.", e);
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (inputStream != null) {
inputStream.close();
}
}
return jsonResponse;
}
private String readFromStream(InputStream inputStream) throws IOException {
StringBuilder output = new StringBuilder();
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line != null) {
output.append(line);
line = reader.readLine();
}
}
return output.toString();
}
}
}

Your class signature suggests that you are expecting a URL type as parameter, but you are passing a String type in the execute() method. All you need to do is to change your class signature to expect a String as in the one in this code.
private class EarthQuakeAsyncTask extends AsyncTask<String,Void,ArrayList<EarthQuake>> {
#Override
protected ArrayList<EarthQuake> doInBackground(String... urls) {
if(urls.length==0||urls[0]== null){
return null;
}
// Create a URL object from the String passed to the execute method
URL url = createUrl(urls[0]);
try {
jsonResponse = makeHttpRequest(url);
} catch (IOException e) {
// TODO Handle the IOException
}
ArrayList<EarthQuake> earthquake = QueryUtils.extractEarthquakes(jsonResponse);
return earthquake;
}
#Override
protected void onPostExecute(ArrayList<EarthQuake> earthquake) {
if (earthquake == null) {
return;
}
updateUi();
}
private URL createUrl(String stringUrl) {
URL url;
try {
url = new URL(stringUrl);
} catch (MalformedURLException exception) {
Log.e(LOG_TAG, "Error with creating URL", exception);
return null;
}
return url;
}
private String makeHttpRequest(URL url) throws IOException {
// If the URL is null, then return early.
if (url == null) {
return jsonResponse;
}
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// If the request was successful (response code 200),
// then read the input stream and parse the response.
if (urlConnection.getResponseCode() == 200) {
inputStream = urlConnection.getInputStream();
jsonResponse = readFromStream(inputStream);
} else {
Log.e(LOG_TAG, "Error response code: " + urlConnection.getResponseCode());
}
} catch (IOException e) {
Log.e(LOG_TAG, "Problem retrieving the earthquake JSON results.", e);
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (inputStream != null) {
inputStream.close();
}
}
return jsonResponse;
}
private String readFromStream(InputStream inputStream) throws IOException {
StringBuilder output = new StringBuilder();
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line != null) {
output.append(line);
line = reader.readLine();
}
}
return output.toString();
}
}
}

That is because your AsyncTask class isn't defined in a manner to handle the execute method with a String parameter. Let me explain myself.
The AsyncTask class you develop will look like this:
private class MyAsyncTask extends AsyncTask<TYPE1, TYPE2, TYPE3> {
protected TYPE3 doInBackground(TYPE1... type1_variables) {
// Do some long process here..
return variable_of_type_TYPE3;
}
protected void onPostExecute(TYPE3 result) {
// Do something here
}
}
So for you to call task.execute(REQUESTED_URL); you'd need to implement your AsyncTask class correctly.
For example it might look like this:
private class EarthQuakeAsyncTask extends AsyncTask<String, Void, Void> {
...
}

android get url from edit text and use it in rest api to upload data

Here is my android rest request code but the where i get the url from edit text using its id but "getString" gets flagged(can't be resolved). Please help
class RESTRequest
{
//final String ADD_STROKE_URL = "";
final String ADD_STROKE_URL = new String[]{ getString(R.id.buttonUploadURL)};
public Boolean success = null;
private JSONObject params;
private String strokeId;
private HashSet<Point> localPoints;
private StrokeManagerCallback callback;
public static String encode(Object x) {
try {
return URLEncoder.encode(String.valueOf(x),"UTF-8");
} catch (UnsupportedEncodingException e) {
return(String.valueOf(x));
}
}
public RESTRequest(JSONObject params,String strokeId,Set<Point> points,StrokeManagerCallback callback)
{
this.params = params;
this.strokeId = strokeId;
this.localPoints = new HashSet<Point>();
this.localPoints.addAll(points);
this.callback = callback;
new ExecuteREST().execute();
}
private class ExecuteREST extends AsyncTask<Void, Void, String>
{
protected String doInBackground(Void ...arg0)
{
/* Build URL query */
StringBuffer local = new StringBuffer(ADD_STROKE_URL);
if(params != null)
{
local.append("?");
Iterator<?> k = params.keys();
while(k.hasNext()){
try {
String key = (String) k.next();
Object value = params.get(key);
local.append(encode(key));
local.append("=");
local.append(encode(value));
if(k.hasNext()){
local.append("&");
}
}
catch (JSONException e) {e.printStackTrace();}
}
}
HttpURLConnection urlConn = null;
StringBuffer response = new StringBuffer("error");
try
{
URL url = new URL(local.toString());
urlConn = (HttpURLConnection) url.openConnection();
urlConn.setRequestMethod("GET");
urlConn.setDoInput(true);
urlConn.setUseCaches(false);
urlConn.setRequestProperty("Content-Type", "application/json");
urlConn.connect();
//Get Response
InputStream is = urlConn.getInputStream();
BufferedReader rd = new BufferedReader(newInputStreamReader(is));
String line;
response = new StringBuffer();
try{
while((line = rd.readLine()) != null) {
response.append(line);
}
}
finally{
if(urlConn != null){
urlConn.disconnect();
urlConn = null;
}
if(rd != null){
rd.close();
rd = null;
}
}
if(callback != null){
callback.onSuccess(strokeId, localPoints);
}
} catch (ConnectException e) {
callback.onFailure(strokeId, localPoints);
} catch (UnknownHostException e) {
callback.onFailure(strokeId, localPoints);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (EOFException e) {
response = new StringBuffer("No response from server");
} catch (IOException e) {
e.printStackTrace();
} catch (RuntimeException e) {
e.printStackTrace();
}
finally{
if(urlConn != null){
urlConn.disconnect();
}
}
return response.toString();
}
}

you can get String Resources like this
Resources res = context.getResources();
final String ADD_STROKE_URL = new String[]{ res.getString(R.id.buttonUploadURL)};
and now you can pass that url in AcycncTask class like this
public RESTRequest(JSONObject params,String
strokeId,Set<Point>points,StrokeManagerCallback callback){
this.params = params;
this.strokeId = strokeId;
this.localPoints = new HashSet<Point>();
this.localPoints.addAll(points);
this.callback = callback;
new ExecuteREST(/*Pass url here that you will get in doInBackground method */)
.execute();
}
private class ExecuteREST extends AsyncTask<String, Void, String>{
protected String doInBackground(String ...arg0){
//get your url in arg0 variable
StringBuffer local = new StringBuffer(arg0[0]);
.
.
.
//Rest of yours ...

Android automatic webview login

I am trying to get my webview to show a page that is only accesible after i am logged in. but whatever i try i cant get past the login url.
How can i open/show the SEND_VISUM_URL after i login.
this is what i have so far:
String LOGIN_URL = "http://10.35.50.125/BCS/index.php?module=";
String SEND_VISUM_URL = "http://10.35.50.1/BCS/index.php?module=ScanVisa&Action=save";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView)findViewById(R.id.webviewer);
webView.loadUrl(LOGIN_URL);
cookieManager = new CookieManager();
Button login = (Button) findViewById(R.id.PostData);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
new loginTask().execute(getLoginData());
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
}
public class loginTask extends AsyncTask<String, String, String> {
#Override
protected String doInBackground(String... params) {
String loginData = params[0];
String text = "";
BufferedReader reader = null;
// Send data
try {
// Defined URL where to send data
URL login_url = new URL(LOGIN_URL);
// getting cookies:
URLConnection conn = login_url.openConnection();
conn.connect();
// setting cookies
cookieManager.storeCookies(conn);
cookieManager.setCookies(login_url.openConnection());
cookiestring = cookieManager.toString();
Log.d("Cookie in logintask:", cookiestring);
conn.getContent();
conn.setDoOutput(true);
conn.setConnectTimeout(3000);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
try {
wr.write(loginData); //post
wr.flush();
} catch (Exception e) {
e.printStackTrace();
}
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
if (line.length() > 0) {
sb.append(line + "\n");
if (line == null) {
continue;
}
}
}
text = sb.toString();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
try {
if (reader != null) reader.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
return text;
}
protected void onPostExecute(String line) {
if (!line.contains("I107")) { //I107 is an error code that is returend when a login failed
Toast.makeText(getBaseContext(), "Login succesfull", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getBaseContext(), "Login failed", Toast.LENGTH_LONG).show();
}
}
}
public void setCookies(URLConnection conn) throws IOException {
// let's determine the domain and path to retrieve the appropriate cookies
URL url = conn.getURL();
String domain = getDomainFromHost(url.getHost());
String path = url.getPath();
Map domainStore = (Map)store.get(domain);
if (domainStore == null) return;
StringBuffer cookieStringBuffer = new StringBuffer();
Iterator cookieNames = domainStore.keySet().iterator();
while(cookieNames.hasNext()) {
String cookieName = (String)cookieNames.next();
Map cookie = (Map)domainStore.get(cookieName);
// check cookie to ensure path matches and cookie is not expired
// if all is cool, add cookie to header string
if (comparePaths((String)cookie.get(PATH), path) && isNotExpired((String)cookie.get(EXPIRES))) {
cookieStringBuffer.append(cookieName);
cookieStringBuffer.append("=");
cookieStringBuffer.append((String)cookie.get(cookieName));
if (cookieNames.hasNext()) cookieStringBuffer.append(SET_COOKIE_SEPARATOR);
}
}
try {
conn.setRequestProperty(COOKIE, cookieStringBuffer.toString());
} catch (java.lang.IllegalStateException ise) {
IOException ioe = new IOException("Illegal State! Cookies cannot be set on a URLConnection that is already connected. "
+ "Only call setCookies(java.net.URLConnection) AFTER calling java.net.URLConnection.connect().");
throw ioe;
}
}
any help would be greatly appreciated!