In my app i have access to web server. It works fine in Some phones but while testing in Samsung Galaxy
Model No - GT-S5830i
Android Version - 2.3.6
it keeps on showing Unknown host exception. I have checked the url from browser its working fine.
private void submitUploadData(String url ,Map<String, String> param) throws IOException
{
URL siteUrl;
try {
siteUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) siteUrl.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);
DataOutputStream out = new DataOutputStream(conn.getOutputStream());
Set getkey = param.keySet();
Iterator keyIter = getkey.iterator();
String content = "";
for(int i=0; keyIter.hasNext(); i++) {
Object key = keyIter.next();
if(i!=0) {
content += "&";
}
content += key + "=" + param.get(key);
}
out.writeBytes(content.trim());
out.flush();
out.close();
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line = "";
while((line=in.readLine())!=null) {
System.out.println(line);
}
in.close();
//Intent home = new Intent(SyncHttp.this,TimeAndExpensesSKActivity.class);
//startActivity(home);
db.updateTimeExported(1);
db.updateExpensesExported(1);
db.close();
db.close();
if(db.getLogCount()==0){
db.insertSyncDateDetails(getDateandTime());}
else{
db.updateSyncDateDetails(1, getDateandTime());}
} catch (MalformedURLException e) {
e.printStackTrace();
}
this.setResult(FINISH_RESULT);
db.close();
}
I have already added permissions
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
I am really confused why this exception occurring.
Thanks for your help guys.
My app did this too. This usually caused by unstable network connection. What I did was catching this UnknownHostException and modify the code in a way that if UnknownHostException happened, I try to re-fetch the URL again, after several miliseconds sleep.
The basic algorithm is something like this:
private void submitUploadData(String url ,Map<String, String> param) throws IOException
{
URL siteUrl;
boolean isDataSubmitted = false;
while(!isDataSubmitted){
try {
//do your complicated http process
isDataSubmitted = true;
} catch(UnknownHostException uhe){
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
}
I have also experienced some issues using URLConnections especially HTTPS on the Samsung Galaxy TAB, but i would imagine it probably occurs on other models as well since there are a ton of devices with the same name but made for different markets and mobile providers.
So far i haven't found a way around sorry, since i tend to avoid the URLConnection class due to a ton of other issues it has.
I suggest using the Apache HTTP Client to communicate with your API's. you can google a ton of examples of using it.
Also when looking at your code i would suggest reading a bit more into the try-catch-finally block statements in java. it is really important to properly close connections at the end or in case of errors.
Other possibilities are:
There is no connection of any sort active (mobile or wifi)
You are missing the "http://www." in your url.
I think calling close() on the DataOutputStream before you recieve your input might close the whole connection - try commenting out that line.
Have you checked the URL from the phone's browser?
Please log the URL you pass to the function and try it in your phone's browser. I would think of missing/incorrect protocol specifier and or URL string formation issues of which this particular phone is unforgiving.
Related
I am trying to get list of videos uploaded on my YouTube channel using following
https://www.googleapis.com/youtube/v3/search?part=snippet&channelId{MY_CHANNEL_ID}&maxResults=50&key={MY_APP_ID}
I have created App in Google App Console and generate APP ID for the same. But when I trying to access it through my Android application getting java.io.FileNotFoundException error
I have given application identifier and SHA1 also, If I try to access through Web Browser key without any other constrains it works well and returns all the video list but in case of Android it is not working.
#Override
protected String doInBackground(Void... voids) {
HttpURLConnection urlConnection = null;
String urlString = "https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCrF362wkcVnjqqPRsSEzvgg&maxResults=50&key=AIzaSyAiAFjZb1eVdRxVWnymrhuAb1iDlmYupu8";
//urlString = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=PLTqSMwQKOhUhl7gm7h6YwX6XPYr0ViBtu&key=AIzaSyAiAFjZb1eVdRxVWnymrhuAb1iDlmYupu8";
String jsonString = new String();
URL url = null;
try {
url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setDoOutput(true);
urlConnection.connect();
BufferedReader br=new BufferedReader(new InputStreamReader(url.openStream()));
char[] buffer = new char[1024];
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line+"\n");
}
br.close();
jsonString = sb.toString();
System.out.println("JSON: " + jsonString);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return jsonString;
}
Error Log
BasicNetwork.performRequest: Unexpected response code 403 for https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCrF362wkcVnjqqPRsSEzvgg&maxResults=50&key=AIzaSyAiAFjZb1eVdRxVWnymrhuAb1iDlmYupu8
05-13 15:28:26.607 19118-19151/com.jeevanmulmantra W/System.err: java.io.FileNotFoundException: https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCrF362wkcVnjqqPRsSEzvgg&maxResults=50&key=AIzaSyAiAFjZb1eVdRxVWnymrhuAb1iDlmYupu8
Without looking at your API Console settings, I cannot say for sure. But from looking at the HTTP response, it looks like your IP address might be blocked by the Google authorization server. Hence, it is sending you back an unauthorized request HTTP status code 403.
Go to your API Console and select the None radio button from under the Key restrictions section. Then try again. It should work.
This is not exactly what you are asking but I will share my experience.
I had a similar situation a couple of months ago. Seaching on line I got to the conclusion that the YouTube api option for Android just doesn't work. I ended up with a more convenient solution for my development:
I got a YT api key for a website and bound it to the corresponding domain.
I Created a php file that gets the playlist from youtube twice a day using curl and cron job setup on the server. The playlist file in json format is then written to the web server (refreshed twice a day).
The Android app connects to my server intead of YTs and get the "cached" json play list from there.
This option drastically reduces the impact on the quota consumption because all the hits to the playlist go to the website.
If you are interested in this option I can share the php used for getting the play list.
I had the same problem, just regenerate another key and restrict it again with the package name and SHA1 from your Android Studio. It wasn't working with the old key regenerating the key and restricting it again worked for me.
I'm trying to send a PUT request but failing bad in it.
Only the first time I'm trying to send data the following line follows up in the log (in further use no exceptions are thrown):
E/DataScheduler: isDataSchedulerEnabled():false
I tried to google out what could that possibly mean, but with no luck. And even that in the further attempts on sending data the mentioned exception wont raise anymore, still no data is being sent. I'm trying to send it on my own server and I can see no connections are received on that side. Using my Android's browser I can send a successful GET request however.
I've also set the permission for Internet already by:
<uses-permission android:name="android.permission.INTERNET" />
I'm not very familiar with Java or Android but as far as I know the request should be formed and sent the following way:
public void sendFilesWithPut(String address, String file) {
new AsyncTask<String,Void,Void>() {
#Override
protected Void doInBackground(String... params) {
try {
//Log.d("HTTP:","Address:"+params[0]+":"+params[1]+" file:"+params[2]);
URL url = new URL("http://" + params[0] + ":" + params[1]);
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setRequestMethod("PUT");
OutputStreamWriter out = new OutputStreamWriter(httpCon.getOutputStream());
out.write(params[2]);
out.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}.execute(address, Integer.toString(port), file);
}
I can print a line to Log every time I attempt to send a PUT request and it's all correct: IP, port and the to-be-sent-String.
Any ideas how to make it work?
I suspect that params[0] and params[1] are actually the address and port for your url. If so then you may wish to refer to the following post:
Making PUT request with JSON data using HttpURLConnection is not working
Where the content will be sent if you start interaction with the response, so add the following:
System.err.println(httpCon.getResponseCode());
as per the post, and see if that works?
I followed this to Parse Json In Android
I have Successfully Done it with HttpData handler..
Here I am Successfully Posting Data to server and Getting Response..
Now I want to Use this same in the Part of HTTPS..
Can Any one suggest me How to do this Without Major Changes in my code.. Because In my application I am doing this for more activities.. Please Suggest me to Use HTTPs in my code..
I will provide Additional Info... Depending Responses...
Update
In my code I have Changed HttpURLConnection to HttpsURLConnection
Please suggest me How to through this error In my code..
Update 1
I have Changed Certificate on server side.. Now its working On Https..
But Now,
I want to Use HTTP and HTTPS Both in one app Depending on Client Requirement So here now its worked with Https....
But I also need to work with Http
In my Code Can any any one suggest me...I want I should Work with Https and Http Both In one App.
to use both HTTP and HTTPS, you need to have the 2 methods (i think you already have them)
GetHTTPData(String urlString)
GetHTTPSData(String urlString)
now in HTTPDataHandler class (where you have both methods above)
you need to create a 3rd method GetDataFromUrl(), that will check URL and decide which method to use (http or https)
public String GetDataFromUrl(String url){
if(url.toLowerCase().startsWith("https")){
//HTTPS:
return GetHTTPSData(url);
}else{
//HTTP:
return GetHTTPData(url);
}
}
now in the AsyncTask class ProcessJSON
replace this line stream = hh.GetHTTPData(urlString);
with this one stream = hh.GetDataFromUrl(urlString);
if you don't want to add that 3rd method in HTTPDataHandler, just use the if-statement in ProcessJSON at doInBackground() to call either one of the 2 methods (http or https)
You can use HttpsURLConnection, replace HttpURLConnection by HttpsURLConnection .
public String GetHTTPData(String urlString){
try{
URL url = new URL(urlString);
HttpsURLConnection urlConnection =(HttpsURLConnection)url.openConnection();
// Check the connection status
if(urlConnection.getResponseCode() == 200)
{
// if response code = 200 ok
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
// Read the BufferedInputStream
BufferedReader r = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
sb.append(line);
}
stream = sb.toString();
// End reading...............
// Disconnect the HttpURLConnection
urlConnection.disconnect();
}
else
{
// Do something
}
}catch (MalformedURLException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}finally {
}
// Return the data from specified url
return stream;
}
What I understand is in your server side, they used self signed SSL certificate. So you have to install that certificate in your android device also. Settings > Security > install form storage.But for production build you have to buy ssl certificate from CA Authorities.
Hope this will solve your problem.
Remove HttpDataHandler lines in doInBackground use HttpUrlConnection directly in doInBackground or use HttpUrlConnection in JSONparse class to post params to server follow this tutorial to post params Website
My Android tablet application does not work with ICS due to a Login problem. When I looked at my code and ran it under debug mode on an ICS tablet, I see the problem but I don't understand it. The code functions correctly on all Honeycomb models that i have tested and in fact I have two tablets hooked up to my computer (one Samsung Galaxy Tab running 3.2, and a Motorola Xoom wifi running 4.0.3) and the code fails on ICS and works on HC.
The failure is a Socket Timeout exception. The timeout was 2000ms, but I upped it to 100000ms to test and it had no impact.
Using the browser on the ICS tablet, I can go to the URL and it responds, so it doesn't appear to be network related.
I am running on a background thread using AsyncTask.
Slurp just takes all of the input from the InputStream and using StringBuilder creates a string representation. Its not actually useful in this request but I added it to see what the server was replying with.
I am POSTing to the page the same way a user authenticates using the form, which is why I am using x-www-form-urlencoded.
Again, this code functions perfectly on Honeycomb but fails on ICS.
The code makes a connection but fails when it asks for a response from the server, almost like the server is still waiting for something... anyway, here is the code:
static public String authenticate(String service_url, String username, String password) throws IOException {
if (username == null || password == null)
throw new IOException();
String charset = "UTF-8";
String query = String.format("Email=%s&Password=%s",URLEncoder.encode(username, charset),URLEncoder.encode(password, charset));
byte [] data = query.getBytes(charset);
URL url = new URL(service_url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("Accept-Charset", charset);
connection.setRequestProperty("Content-Length", Integer.toString(data.length));
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setReadTimeout(5000); // 2 second timeout.
try {
connection.connect();
DataOutputStream pw = new DataOutputStream (connection.getOutputStream());
pw.writeBytes(query);
pw.flush();
pw.close();
int code = connection.getResponseCode(); //SOCKET TIMEOUT HERE
if (code == 200 || code == 302)
{
InputStream is = connection.getInputStream();
String value = slurp(is);
List<String> cookies = connection.getHeaderFields().get("Set-Cookie");
if (cookies == null)
throw new IOException();
for (String cookie : cookies) {
if (cookie.startsWith("cpms")) {
cookieTime = new DateTime(); //crazy but the expires time in the cookie is not actually accurate.
return cookie; // this is the only correct path out.
}
}
}
else
Logger.e(StaticUtils.class, "Invalid response code while logging in: " + code);
}
catch (IOException ioe)
{
Logger.e(StaticUtils.class, ioe);
throw ioe; // log it and then throw it back.
} finally {
connection.disconnect();
}
return null;
}
Given a Url for an image, I want to downoload it and paste it onto my canvas in android. How do I retrieve the image into my app ?
Please help.
Thanks,
de costo.
Dont forget to give the app the permission to connect to the Web,
in the AndroidManifest.xml:
<uses-permission android:name="android.permission.INTERNET" />
You can use the following code to download an image:
URLConnection connection = uri.toURL().openConnection();
connection.connect();
InputStream is = connection.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is, 8 * 1024);
Bitmap bmp = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
Requires the following permission in AndroidManifest.xml:
<uses-permission android:name="android.permission.INTERNET" />
There is a an HTTP client library that might be supported in Android now, but for any fine grain control you can use URL & HttpURLConnection. the code will look something like this:
URL connectURL = new URL(<your URL goes here>);
HttpURLConnection conn = (HttpURLConnection)connectURL.openConnection();
// do some setup
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("GET");
// connect and flush the request out
conn.connect();
conn.getOutputStream().flush();
// now fetch the results
String response = getResponse(conn);
where getResponse() looks something like this, in your case you are getting
a pile of binary data back you might want to change the StringBuffer to a byte array
and chunk the reads by a larger increment.
private String getResponseOrig(HttpURLConnection conn)
{
InputStream is = null;
try
{
is = conn.getInputStream();
// scoop up the reply from the server
int ch;
StringBuffer sb = new StringBuffer();
while( ( ch = is.read() ) != -1 ) {
sb.append( (char)ch );
}
return sb.toString();
}
catch(Exception e)
{
Log.e(TAG, "biffed it getting HTTPResponse");
}
finally
{
try {
if (is != null)
is.close();
} catch (Exception e) {}
}
return "";
}
As you are talking about image data which can be large, other things you need to be assiduous about in Android is making sure you release your memory as soon as you can, you've only got 16mb of heap to play with for all apps and it runs out fast and the GC will drive you nuts if you aren't really good about giving back memory resources