Develop Reference

how do pragmatically login to a website from an android app?

OK,Recently i was trying to make an android app that logs in to a website my android app contains 3 text boxes and an image view the 3 text boxes will contain username, password and verification code and the image view will contain the code i want to make the user type in the verification text box the username, password and verification code written in the image view but all of the 4 things are gotten from the website and after the text boxes are written in the app the data is send to the website and if the data is correct it will go to another page and the app will get data from that page (in the website) and display it in the app and the the user edit that data and click save and the data is sent back to the website
that is the website am trying to login to https://noor.moe.gov.sa/noor/login.aspx
any help?
i have already tried HTTPUrlPost but the app just stops working!
here is the code:
public class MainActivity extends AppCompatActivity {
EditText name,pass,verfi;
Button save;
ImageView captcha;
String url = "https://noor.moe.gov.sa/noor/CAPTCHAImage.aspx?GUID=53eb1d8a-f61b-411e-8dd8-ad756e49771e";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
name = (EditText) findViewById(R.id.name);
pass = (EditText) findViewById(R.id.pass);
verfi = (EditText) findViewById(R.id.verf);
save = (Button) findViewById(R.id.button);
captcha = (ImageView) findViewById(R.id.cap);
String getname = name.getText().toString();
String getpass = name.getText().toString();
String getverf = name.getText().toString();
String data = "tbPublic=name&tbPrivate=password&tbCaptcha=captcha";
final String loginUrl = "https://noor.moe.gov.sa/noor/login.aspx";
final String Login = POST_req(loginUrl, data, 10000); /*last parameter is a limit of page content length*/
LoadImageFromURL(url);
}
private void LoadImageFromURL(String url) {
Picasso.with(this).load(url).placeholder(R.mipmap.ic_launcher)
.error(R.mipmap.ic_launcher).into(captcha,new com.squareup.picasso.Callback(){
#Override
public void onSuccess() {
}
#Override
public void onError() {
}
});
}
public String POST_req(String url, String post_data, int len) {
URL addr = null;
try {
addr = new URL(url);
} catch (MalformedURLException e) {
return "Некорректный URL";
}
StringBuffer data = new StringBuffer();
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) addr.openConnection();
} catch (IOException e) {
return "Open connection error";
}
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Accept-Language", "ru,en-GB;q=0.8,en;q=0.6");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.setRequestProperty("Cookie", "");
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setInstanceFollowRedirects(true);
set_cookie(conn);
//POST data:
String post_str = post_data;
data.append(post_str);
try {
conn.connect();
} catch (IOException e) {
return "Connecting error";
}
DataOutputStream dataOS = null;
try {
dataOS = new DataOutputStream(conn.getOutputStream());
} catch (IOException e2) {
return "Out stream error";
}
try {
((DataOutputStream) dataOS).writeBytes(data.toString());
} catch (IOException e) {
return "Out stream error 1";
}
/*If redirect: */
int status;
try {
status = conn.getResponseCode();
} catch (IOException e2) {
return "Response error";
}
if (status == HttpURLConnection.HTTP_MOVED_TEMP || status == HttpURLConnection.HTTP_MOVED_PERM || status == HttpURLConnection.HTTP_SEE_OTHER) {
String new_url = conn.getHeaderField("Location");
String cookies = conn.getHeaderField("Set-Cookie");
URL red_url;
try {
red_url = new URL(new_url);
} catch (MalformedURLException e) {
return "Redirect error";
}
try {
conn = (HttpURLConnection) red_url.openConnection();
} catch (IOException e) {
return "Redirect connection error";
}
//conn.setRequestProperty("Content-type", "text/html");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Accept-Language", "ru,en-GB;q=0.8,en;q=0.6");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.setRequestProperty("Cookie", cookies);
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setInstanceFollowRedirects(true);
}
java.io.InputStream in = null;
try {
in = (java.io.InputStream) conn.getInputStream();
} catch (IOException e) {
return "In stream error";
}
InputStreamReader reader = null;
try {
reader = new InputStreamReader(in, "UTF-8");
} catch (UnsupportedEncodingException e) {
return "In stream error";
}
char[] buf = new char[len];
try {
reader.read(buf);
} catch (IOException e) {
return "In stream error";
}
get_cookie(conn);
return (new String(buf));
}
public void get_cookie(HttpURLConnection conn) {
SharedPreferences sh_pref_cookie = getSharedPreferences("cookies", Context.MODE_PRIVATE);
String cook_new;
String COOKIES_HEADER;
if (conn.getHeaderField("Set-Cookie") != null) {
COOKIES_HEADER = "Set-Cookie";
}
else {
COOKIES_HEADER = "Cookie";
}
cook_new = conn.getHeaderField(COOKIES_HEADER);
if (cook_new.indexOf("sid", 0) >= 0) {
SharedPreferences.Editor editor = sh_pref_cookie.edit();
editor.putString("Cookie", cook_new);
editor.commit();
}
}
public void set_cookie(HttpURLConnection conn) {
SharedPreferences sh_pref_cookie = getSharedPreferences("cookies", Context.MODE_PRIVATE);
String COOKIES_HEADER = "Cookie";
String cook = sh_pref_cookie.getString(COOKIES_HEADER, "no_cookie");
if (!cook.equals("no_cookie")) {
conn.setRequestProperty(COOKIES_HEADER, cook);
}
}

How can i display images that i am receiving from (server) in a string ? Here is the code:

How can i display images that i am receiving from (server) in a string ?
I'm using AsyncTask
Here is the code:
AsyncTask
public class sendRequest extends AsyncTask<String, Void,String> {
String response="";
Context context;
sendRequest(Context context)
{
this.context=context;
// this.list=list;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... params)
{
URL url;
BufferedReader reader = null;
String link =<i> "example.com/example.php";</i>
try {
url = new URL(link);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(5 * 1000);
connection.setReadTimeout(5 * 1000);
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.connect();
String inputToFile = URLEncoder.encode("mName", "UTF-8") + "=" + URLEncoder.encode("name", "UTF-8");
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(inputToFile);
writer.flush();
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
//Here i have add data to string how to display images
//The result of Toast in onpostexecute is
//{"images":[{"image":"http:\/\/example.com\/example.jpg"},{"image":"http:\/\/example.com\/example.jpg"}]}
response += line;
}
//Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
//Toast.makeText(context,bmp.toString(),Toast.LENGTH_SHORT).show();
} catch (MalformedURLException e) {
// DonorList.setText("Url Error");
e.printStackTrace();
response = "Exception: " + e.getMessage();
} catch (IOException e) {
// DonorList.setText("Connection could not be opened");
e.printStackTrace();
response += "Exception: " + e.getMessage();
}
return response;
}// DO IN BACKGROUND
#Override
protected void onPostExecute(String response) {
super.onPostExecute(response);
Toast.makeText(context, "Recieved: "+response, Toast.LENGTH_LONG).show();

Use Glide library for loading image in ImageView
Glide.with(context).load(image_url).into(imageView);

Getting bitmap as null

I am trying to download the image from url and save it in a file. But it's not getting saved. So as I debug the code I found that bitmap is always null.
code:
public class ImageUserTask extends AsyncTask<Void, Void,String> {
String strURL, imageprofile;
Bitmap mBitmap = null;
Context mContext;
private File profileFile;
public ImageUserTask(Context context, String url) {
this.strURL = url;
this.imageprofile = imageprofile;
this.mContext = context;
}
#Override
protected String doInBackground(Void... params) {
Bitmap bitmap = null;
File directory = null;
try {
URL url = new URL(strURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
// InputStream input = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream()); //This bitmap is null always
directory = Environment.getExternalStorageDirectory();
// Create a new folder in SD Card
File dir = new File(Environment.getExternalStorageDirectory().getPath() + "/Profile");
if (!directory.exists() && !directory.isDirectory()) {
directory.mkdirs();
}
File mypath = new File(dir,"ProfileImage");
saveFile(mypath, bitmap);
} catch (MalformedURLException e) {
} catch (IOException e) {
}
return directory.getAbsolutePath();
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (result != null) {
imageprofile = result;
}
}
private void saveFile(File fileName, Bitmap bmp) {
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(fileName);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, outputStream); // 100 will be ignored
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
EDIT:
public class ImageUserTask extends AsyncTask<Void,Void,Bitmap> {
String strURL, imageprofile;
Bitmap mBitmap = null;
Context mContext;
private File profileFile;
public ImageUserTask(Context context, String url) {
this.strURL = url;
this.imageprofile = imageprofile;
this.mContext = context;
}
#Override
protected Bitmap doInBackground(Void... params) {
getImageFromUrl(strURL);
return mBitmap;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null) {
Bitmap bitmap = result;
}
}
public Bitmap getImageFromUrl(String urlString) {
try {
URL url = new URL(urlString);
try {
if(mBitmap!=null) {
mBitmap.recycle();
mBitmap=null;
}
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setDoInput(true);
//Connected to server
connection.connect();
//downloading image
InputStream input = connection.getInputStream();
mBitmap = BitmapFactory.decodeStream(input);
convertBitmapToFile(mBitmap, urlString);
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
return mBitmap;
}
public File convertBitmapToFile(Bitmap bitmap, String fileName) {
ContextWrapper cw = new ContextWrapper(mContext);
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
File mypath = new File(directory, fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mypath);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return mypath;
}
}
What can be the reason? I have added Internet permissions too. Please help. Thank you..

class DownloadFile extends AsyncTask<String, Integer, String> {
String strFolderName;
String shareType;
String downloadPath = "";
Activity mContext;
public DownloadFile(Activity mContext) {
this.mContext = mContext;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... aurl) {
int count;
try {
String fileName = "your filename with ext";
Log.d("TAG", fileName);
URL url = new URL("your url");
URLConnection conexion = url.openConnection();
conexion.connect();
String PATH = "your Path you want to store" + "/";
downloadPath = PATH + fileName;
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(downloadPath);
byte data[] = new byte[1024];
while ((count = input.read(data)) != -1) {
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String path) {
super.onPostExecute(path);
}
}
This code is work for me

Use the below methods
public Bitmap getImageFromUrl(String urlString) {
Bitmap bmp = null;
try {
URL url = new URL(urlString);
try {
if(bmp!=null) {
bmp.recycle();
bmp=null;
}
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
convertBitmapToFile(bmp, urlString);
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
return bmp;
}
public File convertBitmapToFile(Bitmap bitmap, String fileName) {
ContextWrapper cw = new ContextWrapper(activityRef.getApplicationContext());
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
File mypath = new File(directory, fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mypath);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return mypath;
}
Add android Permissions for internet and Storage

Please try this
public static Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}

Cancel Async Task while downloading image

Hi,
I have an async task which downloads image via http request and shares it after completion. But if the user cancel the task, it should stop.
I'm calling it like this:
mShareImage = new shareAsync(PhotoEnlargeActivity.this).execute(imageUris.get(currentPosition));
And stopping it like this:
mShareImage.cancel(true);
But it doesn't seen to work. Async Task:
public class shareAsync extends AsyncTask<String, String, String> {
private Context mContext;
URL myFileUrl;
Bitmap bmImg = null;
Intent share;
File file;
boolean isCancelled = false;
public shareAsync(Context mContext) {
this.mContext = mContext;
}
#Override
protected void onCancelled() {
super.onCancelled();
isCancelled = true;
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
showProgressDialog("Downloading High Resolution Image for Sharing...");
}
#Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
HttpURLConnection conn = null;
try {
if (!isCancelled()) {
myFileUrl = new URL(args[0]);
conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
} else {
if (conn != null) conn.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
String path = myFileUrl.getPath();
String idStr = path.substring(path.lastIndexOf('/') + 1);
File filepath = Environment.getExternalStorageDirectory();
File dir = new File(filepath.getAbsolutePath()
+ "/Google Image Wallpaper/");
dir.mkdirs();
String fileName = idStr;
file = new File(dir, fileName);
FileOutputStream fos = new FileOutputStream(file);
bmImg.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String args) {
// TODO Auto-generated method stub
progressDialog.dismiss();
share = new Intent(Intent.ACTION_SEND);
share.setType("image/jpeg");
share.putExtra(Intent.EXTRA_STREAM, Uri.parse(file.getAbsolutePath().toString()));
mContext.startActivity(Intent.createChooser(share, "Share Image"));
}
}

Invoking the method "mShareImage.cancel(true)" will cause subsequent calls to isCancelled() to return true.
But you have to do few more things,
To ensure that a task is cancelled as quickly as possible, you should always check the return value of isCancelled() periodically inside doInBackground.
You have added the "!isCancelled()" check beginning of the method, so it is not working.
Network operation is a blocking operation, so once its started any operation you have to wait. That's why we always do network operation in a worker thread.
Following change would solve your issue,
#Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
HttpURLConnection conn = null;
try {
myFileUrl = new URL(args[0]);
conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
if (isCancelled()) return null;
conn.connect();
if (isCancelled()) return null;
InputStream is = conn.getInputStream();
if (isCancelled()) return null;
bmImg = BitmapFactory.decodeStream(is);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
conn = null;
}
}
try {
String path = myFileUrl.getPath();
String idStr = path.substring(path.lastIndexOf('/') + 1);
File filepath = Environment.getExternalStorageDirectory();
File dir = new File(filepath.getAbsolutePath()
+ "/Google Image Wallpaper/");
dir.mkdirs();
String fileName = idStr;
file = new File(dir, fileName);
FileOutputStream fos = new FileOutputStream(file);
if (isCancelled()) return null;
bmImg.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String args) {
// TODO Auto-generated method stub
progressDialog.dismiss();
share = new Intent(Intent.ACTION_SEND);
share.setType("image/jpeg");
share.putExtra(Intent.EXTRA_STREAM, Uri.parse(file.getAbsolutePath().toString()));
if (isCancelled()) return;
mContext.startActivity(Intent.createChooser(share, "Share Image"));
}

Download a large pdf with jsoup

I would like to download a large pdf file with jsoup. I have try to change timeout and maxBodySize but the largest file I could download was about 11MB. I think if there is any way to do something like buffering. Below is my code.
public class Download extends Activity {
static public String nextPage;
static public Response file;
static public Connection.Response res;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Bundle b = new Bundle();
b = getIntent().getExtras();
nextPage = b.getString("key");
new Login().execute();
finish();
}
private class Login extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... params) {
try {
res = Jsoup.connect("http://www.eclass.teikal.gr/eclass2/")
.ignoreContentType(true).userAgent("Mozilla/5.0")
.execute();
SharedPreferences pref = getSharedPreferences(
MainActivity.PREFS_NAME, MODE_PRIVATE);
String username1 = pref.getString(MainActivity.PREF_USERNAME,
null);
String password1 = pref.getString(MainActivity.PREF_PASSWORD,
null);
file = (Response) Jsoup
.connect("http://www.eclass.teikal.gr/eclass2/")
.ignoreContentType(true).userAgent("Mozilla/5.0")
.maxBodySize(1024*1024*10*2)
.timeout(70000*10)
.cookies(res.cookies()).data("uname", username1)
.data("pass", password1).data("next", nextPage)
.data("submit", "").method(Method.POST).execute();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
String PATH = Environment.getExternalStorageDirectory()
+ "/download/";
String name = "eclassTest.pdf";
FileOutputStream out;
try {
int len = file.bodyAsBytes().length;
out = new FileOutputStream(new File(PATH + name));
out.write(file.bodyAsBytes(),0,len);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
I hope somebody could help me!

I think, it's better to download any binary file via HTTPConnection:
InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
try {
URL url = new URL("http://example.com/file.pdf");
connection = (HttpURLConnection) url.openConnection();
connection.connect();
// expect HTTP 200 OK, so we don't mistakenly save error report
// instead of the file
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
return "Server returned HTTP " + connection.getResponseCode()
+ " " + connection.getResponseMessage();
}
// this will be useful to display download percentage
// might be -1: server did not report the length
int fileLength = connection.getContentLength();
// download the file
input = connection.getInputStream();
output = new FileOutputStream("/sdcard/file_name.extension");
byte data[] = new byte[4096];
int count;
while ((count = input.read(data)) != -1) {
output.write(data, 0, count);
}
} catch (Exception e) {
return e.toString();
} finally {
try {
if (output != null)
output.close();
if (input != null)
input.close();
} catch (IOException ignored) {
}
if (connection != null)
connection.disconnect();
}
Jsoup is for parsing and loading HTML pages, not binary files.