Develop Reference

Unable to resolve host "My URL" - No address associated with hostname

The exception occurs randomly and then its hard to get rid of. I am tired of this error and despite the fact that I have tried almost everything on stackoverflow from changing url to respective IP address, using real device, adding internet permissions as mentioned or checking wifi connection. Everything is all right except the error which keeps coming back. Yes I also added checking connection code as below :
try {
ConnectivityManager cm = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm.getActiveNetworkInfo().isConnectedOrConnecting()) {
URL url = new URL(urlx);
HttpURLConnection urlc = (HttpURLConnection) url
.openConnection();
urlc.setConnectTimeout(1000); // mTimeout is in seconds
urlc.connect();
if (urlc.getResponseCode() == 200) {
runOnUiThread(new Runnable() {
public void run() {
//Do something on UiThread
upsuccess = true;
}
});
} else {
runOnUiThread(new Runnable() {
public void run() {
//Do something on UiThread
upsuccess = false;
}
});
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
and System.setProperty("http.proxyHost", "myurl.com");
System.setProperty("http.proxyPort", "8080");
but each of them separately as well as together did not fetch me any useful results. Can you suggest me what to do?
I am basically doing this : I am uploading a pdf file on my server and loading the google docs viewer url with that url. I however see the following exception several times. I also added retrying in case I find the exception but the exception randomly happens and is not easy to get out of if you encounter it.
Exception :
java.net.UnknownHostException: Unable to resolve host "myurl.com": No
address associated with hostname 07-20 01:12:11.554
24907-24997/securitymsg.listmydocs W/System.err: at
java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:95)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at java.net.InetAddress.getAllByName(InetAddress.java:752) 07-20
01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err: at
okhttp3.Dns$1.lookup(Dns.java:39) 07-20 01:12:11.554
24907-24997/securitymsg.listmydocs W/System.err: at
okhttp3.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:173)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
okhttp3.internal.http.RouteSelector.nextProxy(RouteSelector.java:139)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at okhttp3.internal.http.RouteSelector.next(RouteSelector.java:81)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
okhttp3.internal.http.StreamAllocation.findConnection(StreamAllocation.java:172)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
okhttp3.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:123)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
okhttp3.internal.http.StreamAllocation.newStream(StreamAllocation.java:93)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at okhttp3.internal.http.HttpEngine.connect(HttpEngine.java:296) 07-20
01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err: at
okhttp3.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at okhttp3.RealCall.getResponse(RealCall.java:243) 07-20 01:12:11.554
24907-24997/securitymsg.listmydocs W/System.err: at
okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at okhttp3.RealCall.execute(RealCall.java:57) 07-20 01:12:11.554
24907-24997/securitymsg.listmydocs W/System.err: at
securitymsg.listmydocs.CloudViewer$UploadFileAsync.doInBackground(CloudViewer.java:678)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
securitymsg.listmydocs.CloudViewer$UploadFileAsync.doInBackground(CloudViewer.java:650)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at android.os.AsyncTask$2.call(AsyncTask.java:305) 07-20 01:12:11.554
24907-24997/securitymsg.listmydocs W/System.err: at
java.util.concurrent.FutureTask.run(FutureTask.java:237) 07-20
01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err: at
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243) 07-20
01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err: at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
07-20 01:12:11.554 24907-24997/securitymsg.listmydocs W/System.err:
at java.lang.Thread.run(Thread.java:761) 07-20 01:12:13.016
24907-24907/securitymsg.listmydocs W/cr_BindingManager: Cannot call
determinedVisibility() - never saw a connection for the pid: 24907
07-20 01:12:13.677 24907-24907/securitymsg.listmydocs
W/cr_BindingManager: Cannot call determinedVisibility() - never saw a
connection for the pid: 24907 07-20 01:12:13.678
24907-24907/securitymsg.listmydocs W/cr_BindingManager: Cannot call
determinedVisibility() - never saw a connection for the pid: 24907
My Permissions in manifest:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
My code to upload file :
*PHP :
<?php
$file_path = "images/";
$neran = $_GET['neran'];
$ext = pathinfo(basename( $_FILES['uploaded_file']['name']), PATHINFO_EXTENSION);
$file_path = "images/".$neran.".".$ext;
if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $file_path) ){
echo "success";
} else{
echo "fail";
}
?>
Android side (I use Retrofit) : The following code is in doinbackground block of AsyncTask
String file_path = f.getAbsolutePath();
OkHttpClient client = new OkHttpClient();
RequestBody file_body = RequestBody.create(MediaType.parse(content_type),f);
Log.e("msh", content_type);
RequestBody request_body = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("type",content_type)
.addFormDataPart("uploaded_file",file_path.substring(file_path.lastIndexOf("/")+1), file_body)
.build();
Request request = new Request.Builder()
.url("http://reviewitapp.co/retrofit_example/save_file.php?neran="+neran)
.post(request_body)
.build();
response = client.newCall(request).execute();
} catch (UnknownHostException e) {
e.printStackTrace();
/*uploadFile(selectedFilePath);*/
upsuccess = false;
} catch (IOException e) {
e.printStackTrace();
upsuccess = false;
} catch (NullPointerException e) {
e.printStackTrace();
/*uploadFile(selectedFilePath);*/
upsuccess = false;
}
if(response!=null) {
if (response.isSuccessful()) {
upsuccess = true;
}
response.body().close();
}

Android Dropbox API v1 upload file and get shared link of this file

I have uploaded file and when I try to get the shared link then it gives NullPointerException.
FileInputStream fis = new FileInputStream(mFile);
String path = mPath + mFile.getName();
DropboxAPI.Entry response = mApi.putFile(path, fis,
mFile.length(), null, new ProgressListener() {
#Override
public long progressInterval() {
// Update the progress bar every half-second or so
return 500;
}
#Override
public void onProgress(long bytes, long total) {
publishProgress(bytes);
}
});
Log.i("DbExampleLog", "The uploaded file's rev is: " + response.rev);
if (response != null) {
mErrorMsg=response.path;
Log.e("DbExampleLog", "*****"+response.path+" The uploaded file's rev is: " + response.rev);
DropboxAPI.DropboxLink shareLink = mApi.share(response.path);
Log.e("DbExampleLog", "*****"+shareLink+" The uploaded file's rev is: " + response.rev);
if(shareLink!=null) {
if(shareLink.url!=null) {
Log.e("Null error URL*****",""+shareLink.url);
Log.e("Null error URL*****",""+getShareURL(shareLink.url));
String shareAddress = getShareURL(shareLink.url).toString();
Log.e("DbExampleLog", "URL -" + shareAddress + "*****" + response.path + " The uploaded file's rev is: " + response.rev);
}
else
Log.e("Null error URL*****",""+shareLink.url);
}
else{
Log.e("Null error*****",""+shareLink);
}
return true;
}
It returns like -
12-05 12:09:09.207 7335-7502/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/DbExampleLog: *****/1480919937073.jpg The uploaded file's rev is: 2ef4a7ca38e
12-05 12:09:10.966 7335-7502/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/DbExampleLog: *****com.dropbox.client2.DropboxAPI$DropboxLink#d9d5da1 The uploaded file's rev is: 2ef4a7ca38e
12-05 12:09:10.966 7335-7502/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/Null error URL*****: https://db.tt/ru6e39XK0
12-05 12:09:12.457 7335-7502/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/Null error URL*****: null
12-05 12:09:13.520 7335-7502/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.trucker.gtd.satyaki.dropboxintegrationapiv1, PID: 7335
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference
at com.trucker.gtd.satyaki.dropboxintegrationapiv1.UploadFile.doInBackground(UploadFile.java:147)
at com.trucker.gtd.satyaki.dropboxintegrationapiv1.UploadFile.doInBackground(UploadFile.java:63)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 
at java.lang.Thread.run(Thread.java:761) 
12-05 12:09:13.645 1248-1248/? E/EGL_emulation: tid 1248: eglCreateSyncKHR(1641): error 0x3004 (EGL_BAD_ATTRIBUTE)
12-05 12:09:13.796 2071-2205/com.android.launcher3 E/EGL_emulation: tid 2205: eglSurfaceAttrib(1146): error 0x3009 (EGL_BAD_MATCH)
12-05 12:09:14.006 1530-1640/system_process E/EGL_emulation: tid 1640: eglSurfaceAttrib(1146): error 0x3009 (EGL_BAD_MATCH)
12-05 12:09:14.304 7335-7335/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/WindowManager: android.view.WindowLeaked: Activity com.trucker.gtd.satyaki.dropboxintegrationapiv1.Main has leaked window DecorView#3bf9cac[] that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:417)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:331)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
at android.app.Dialog.show(Dialog.java:316)
at android.app.AlertDialog$Builder.show(AlertDialog.java:1112)
at com.dropbox.client2.android.AuthActivity.checkAppBeforeAuth(AuthActivity.java:284)
at com.dropbox.client2.android.AndroidAuthSession.startAuthentication(AndroidAuthSession.java:213)
at com.trucker.gtd.satyaki.dropboxintegrationapiv1.Main.onActivityResult(Main.java:132)
at android.app.Activity.dispatchActivityResult(Activity.java:6915)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4049)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
12-05 12:09:14.310 7335-7335/com.trucker.gtd.satyaki.dropboxintegrationapiv1 E/WindowManager: android.view.WindowLeaked: Activity com.trucker.gtd.satyaki.dropboxintegrationapiv1.Main has leaked window DecorView#e8ad10a[] that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:417)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:331)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
at android.app.Dialog.show(Dialog.java:316)
at com.trucker.gtd.satyaki.dropboxintegrationapiv1.UploadFile.<init>(UploadFile.java:98)
at com.trucker.gtd.satyaki.dropboxintegrationapiv1.Main.setLoggedIn(Main.java:144)
at com.trucker.gtd.satyaki.dropboxintegrationapiv1.Main.onResume(Main.java:168)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1269)
at android.app.Activity.performResume(Activity.java:6766)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3377)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3440)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1510)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Mainly in this particular line-
getShareURL(shareLink.url)
Please suggest me why this error occur, but yesterday using this code it worked.
UPDATE CODE ASKED BY Greg
String getShareURL(String strURL) {
URLConnection conn = null;
String redirectedUrl = null;
try {
URL inputURL = new URL(strURL);
conn = inputURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
System.out.println("Redirected URL: " + conn.getURL());
Log.e("Get Redirected URL",""+conn.getURL());
redirectedUrl = conn.getURL().toString();
is.close();
} catch (MalformedURLException e) {
Log.e("TAG", "Please input a valid URL");
} catch (IOException ioe) {
Log.e("TAG", "Can not connect to the URL");
}
return redirectedUrl;
}
This code taken from Share file in Dropbox

Android UnkownHostException on devices with a lower API level

When trying my app on lower api levels such as 15 or 19(on emulators and real devices), i get a UnknownHostException for a specific URL: http://jotihunt-api_v2.mysite123.nl/login mysite123 is fictional. But i don't get a UnknownHostException for other urls such as that of google . So i seems the URL is wrong, but on API level 22 for example i don't get this exception. I have a Internet Connection and i have the required permissions:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
I use this code to execute post/get requests to a web API:
#Override
protected List<WebResponse> doInBackground(WebRequest... params) {
ArrayList<WebResponse> responses = new ArrayList<>();
WebRequest current;
for(int i = 0; i < params.length; i++)
{
current = params[i];
try {
InetAddress address = InetAddress.getByName(current.getUrl().getHost());
Log.i("WebRequestTask", address.toString());
} catch (UnknownHostException exception) {
Log.e("WebRequestTask", exception.toString(), exception);
}
TRYCATCH:
try
{
if(current.getUrl() == null) break TRYCATCH;
HttpURLConnection connection = (HttpURLConnection)current.getUrl().openConnection();
switch (current.getMethod())
{
case WebRequestMethod.POST:
if(current.hasData())
{
connection.setDoOutput(true);
connection.setRequestMethod(WebRequestMethod.POST);
OutputStreamWriter streamWriter = new OutputStreamWriter(connection.getOutputStream());
streamWriter.write(current.getData());
streamWriter.flush();
streamWriter.close();
}
break;
}
InputStream response;
if(connection.getResponseCode() == 200)
{
/*
* Get the response stream.
* */
response = connection.getInputStream();
}
else
{
/*
* Get the error stream.
* */
response = connection.getErrorStream();
}
/**
* Read the stream.
* */
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response));
StringBuilder builder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
builder.append(line);
}
bufferedReader.close();
/**
* Create a response
* */
responses.add(new WebResponse(current, builder.toString(), connection.getResponseCode()));
current.setExecutionDate(new Date());
connection.disconnect();
}
catch(Exception e)
{
/**
* Print the stack trace
* */
e.printStackTrace();
/**
* Log a error.
* */
Log.e("WebRequestTask", e.toString(), e);
/**
* Add a response with as text the error message
* */
responses.add(new WebResponse(current, e.toString(), 0));
}
}
return responses;
}
The state of the objects: http://imgur.com/8ehGBUf
The creation and execution of the request:
WebRequest request = new WebRequest.Builder()
.setId(MY_REQUEST_ID)
.setMethod(WebRequestMethod.POST)
.setUrl(new UrlBuilder().append("http://jotihunt-api_v2.mysite123.nl/login").build())
.setData("sfsf")
.create();
request.executeAsync(new WebRequest.OnWebRequestCompletedCallback() {
#Override
public void onWebRequestCompleted(WebResponse response) {
Log.i("",response.getData());
}
});
This is the exception i get:
08-16 12:33:36.340 4277-4356/nl.rsdt.japp W/System.err: java.net.UnknownHostException: http://jotihunt-api_v2.mysite123.nl/login
08-16 12:33:36.342 4277-4356/nl.rsdt.japp W/System.err: at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:279)
08-16 12:33:36.344 4277-4356/nl.rsdt.japp W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)
08-16 12:33:36.346 4277-4356/nl.rsdt.japp W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)
08-16 12:33:36.348 4277-4356/nl.rsdt.japp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
08-16 12:33:36.352 4277-4356/nl.rsdt.japp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:89)
08-16 12:33:36.355 4277-4356/nl.rsdt.japp W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:197)
08-16 12:33:36.356 4277-4356/nl.rsdt.japp W/System.err: at com.rsdt.anl.WebRequestTask.doInBackground(WebRequestTask.java:53)
08-16 12:33:36.357 4277-4356/nl.rsdt.japp W/System.err: at com.rsdt.anl.WebRequestTask.doInBackground(WebRequestTask.java:21)
08-16 12:33:36.358 4277-4356/nl.rsdt.japp W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:288)
08-16 12:33:36.359 4277-4356/nl.rsdt.japp W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-16 12:33:36.360 4277-4356/nl.rsdt.japp W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
08-16 12:33:36.365 4277-4356/nl.rsdt.japp W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
08-16 12:33:36.372 4277-4356/nl.rsdt.japp W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
08-16 12:33:36.373 4277-4356/nl.rsdt.japp W/System.err: at java.lang.Thread.run(Thread.java:848)
UPDATE
I can resolve the host with InetAdress, but it still doesn't work
UPDATE 2
I found similar issues after some more googling, it seems that underscores are not valid URLs characters.
Sources:
(i cannot include more than 2 links so i left the begin of the link out)
stackoverflow.com/questions/36074952/unknown-host-exception-using-emulator-and-httpurlconnection
code.google.com/p/android/issues/detail?id=37577
github.com/google/ExoPlayer/issues/239

I changed the hostname so that is doesn't contain a underscore, this resolved my issues. It seems that the DNS on older android versions does not support URLs with a underscore
Sources:
Similiar issue
http://code.google.com/p/android/issues/detail?id=37577

Parsing a text file in android from an HTML

So I have been working on this for a bit and hit a brick wall. It keeps giving me a fatal error when it start to process.
So basically I want to read in a text file off the internet and then parse it so I can start to break that apart and use a JSON parser to deal with JSON data. But that further down the line (and i have the part built). I just am having trouble with the connection and downloading of the data. I just want to read in the text file and then print it out again.
Thank you for any help with this.
This is what it gives me
01-26 15:11:48.373 1958-1958/com.example.mmillar.urljsonparser I/art: Not late-enabling -Xcheck:jni (already on)
01-26 15:11:48.556 1958-1958/com.example.mmillar.urljsonparser D/HTML P1:: http://textfiles.com/100/914bbs.txt
01-26 15:11:48.556 1958-1958/com.example.mmillar.urljsonparser D/HTML P2:: http://textfiles.com/100/914bbs.txt
01-26 15:11:48.557 1958-1958/com.example.mmillar.urljsonparser D/HTML inJSON:: http://textfiles.com/100/914bbs.txt
01-26 15:11:48.569 1958-1958/com.example.mmillar.urljsonparser D/Status:: Connection Opened
01-26 15:11:48.569 1958-1958/com.example.mmillar.urljsonparser D/Status:: Closing connection
01-26 15:11:48.569 1958-1958/com.example.mmillar.urljsonparser D/AndroidRuntime: Shutting down VM
01-26 15:11:48.570 1958-1958/com.example.mmillar.urljsonparser E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mmillar.urljsonparser, PID: 1958
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mmillar.urljsonparser/com.example.mmillar.urljsonparser.MainActivity}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
at java.net.InetAddress.lookupHostByName(InetAddress.java:418)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
at java.net.InetAddress.getAllByName(InetAddress.java:215)
at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:232)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:124)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:272)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:199)
at com.example.mmillar.urljsonparser.JSONParser.getStream(JSONParser.java:40)
at com.example.mmillar.urljsonparser.MainActivity.onCreate(MainActivity.java:24)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
at android.app.ActivityThread.access$800(ActivityThread.java:151) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5254) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
01-26 15:11:53.474 1958-1958/? I/Process: Sending signal. PID: 1958 SIG: 9
So I'm a bit lost to where this is going wrong. I think I have everything set up and going good. Like the inputstream, bufferreader and all. So here is what I have.
This is the Parser program
public class JSONParser extends AsyncTask<String, Void, String>{
#Override
protected String doInBackground(String... inputUrl) {
getStream(inputUrl[0]);
return null;
}
public void getStream(String urlString)
{
Log.d("HTML inJSON: ", urlString );
//variables for the connection and downloading the JSON data
URL url = null;
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
url = new URL(urlString);
urlConnection = (HttpURLConnection)url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
Log.d("Status:","Connection Opened");
//read in the data
BufferedReader br = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
//build the data for parsing
StringBuilder myString = new StringBuilder();
String line;
while((line = br.readLine()) !=null)
{
myString.append(line);
}
Log.d("Status:"," JSON loaded into string");
Log.d("Total:", myString.toString());
} catch (IOException e) {
e.printStackTrace();
}finally {
if (urlConnection != null)
{
//close the connection
urlConnection.disconnect();
Log.d("Status:", " Closing connection");
}
}
}
}
And here is the main program I just run the thing because I just want to output from the file to the console I just want to make sure it works.
public class MainActivity extends AppCompatActivity {
//http://textfiles.com/100/914bbs.txt
private String testHtml = "http://textfiles.com/100/914bbs.txt";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d("HTML P1: ", testHtml );
JSONParser jp = new JSONParser();
Log.d("HTML P2: ", testHtml );
jp.getStream(testHtml);
Log.d("HTML P3: ", testHtml);
}

instead of using
jp.getStream(testHtml);
use
jp.execute("stream url here");
Currently you are trying to create a function in your Asynctask, but are not leveraging the use of AsyncTask. It still tries to make a HttpConnection on the mainThread, and that throws the exception.

FileOutputStream not working with API level >= 22

I am trying to write to a file, on SDCARD... I have no problem with this piece of code on emulator and on real device under API lvl 22. But with higher API level then 22 its not working for some reason (I was testing it on Emulator, I have no real device available to test on with higher then API lvl 22)...
Log.d(SmpcWidget.DEBUG_TAG, "Ext. storage readable: " + isExternalStorageReadable());
Log.d(SmpcWidget.DEBUG_TAG, "Ext. storage writable: " + isExternalStorageWritable());
String dir = Environment.getExternalStorageDirectory()+File.separator+"smpcDir";
//create folder
File folder = new File(dir); //folder name
folder.mkdirs();
//create file
File file = new File(dir, "smpcFile.txt");
//path += "testlab.txt";
try {
OutputStream output = new FileOutputStream(file);
try {
try {
byte[] buffer = new byte[4 * 1024]; // or other buffer size
int read;
while ((read = stream.read(buffer)) != -1) {
output.write(buffer, 0, read);
}
output.flush();
} finally {
output.close();
}
} catch (Exception e) {
e.printStackTrace(); // handle exception, define IOException and others
}
} catch (Exception e) { //UPDATE: Edited the code to catch exeption for FileOutputStream
e.printStackTrace();
} finally {
stream.close();
}
return new String("");
Thats the line where it stops without an error (with API level >= 22):
OutputStream output = new FileOutputStream(file);
and immediatelly jumps to
stream.close();
What should be the problem?
UPDATE:
Ok, after putting a catch Exeption for FileOutputStream, I am getting this in logcat:
12-31 12:11:48.814 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ java.io.FileNotFoundException: /storage/1608-2C08/smpcDir/smpcFile.txt: open failed: ENOENT (No such file or directory)
12-31 12:11:48.815 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:452)
12-31 12:11:48.815 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
12-31 12:11:48.815 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:72)
12-31 12:11:48.816 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at com.smpc.davidtoth.smpc.UpdateWidgetService.readIt(UpdateWidgetService.java:321)
12-31 12:11:48.816 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at com.smpc.davidtoth.smpc.UpdateWidgetService.downloadUrl(UpdateWidgetService.java:257)
12-31 12:11:48.817 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at com.smpc.davidtoth.smpc.UpdateWidgetService.access$100(UpdateWidgetService.java:47)
12-31 12:11:48.817 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at com.smpc.davidtoth.smpc.UpdateWidgetService$DownloadWebpageTask.doInBackground(UpdateWidgetService.java:211)
12-31 12:11:48.818 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at com.smpc.davidtoth.smpc.UpdateWidgetService$DownloadWebpageTask.doInBackground(UpdateWidgetService.java:196)
12-31 12:11:48.818 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at android.os.AsyncTask$2.call(AsyncTask.java:295)
12-31 12:11:48.818 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-31 12:11:48.819 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
12-31 12:11:48.819 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
12-31 12:11:48.819 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
12-31 12:11:48.820 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
12-31 12:11:48.820 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
12-31 12:11:48.909 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at libcore.io.Posix.open(Native Method)
12-31 12:11:48.912 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
12-31 12:11:48.913 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:438)
12-31 12:11:48.913 17218-17235/com.smpc.davidtoth.smpc W/System.err﹕ ... 13 more

I have found the solution HERE
In Android api level 23 the permission model changed. Now you need to request permissions at runtime.
Then I implemented it like THIS