Develop Reference

error: cannot find symbol method setHttpProxy(ProxyInfo) problem when try to make toyVpn sample project in androidStudio

i downloaded a sample project from https://developer.android.com/guide/topics/connectivity/vpn under the title ToyVpn and i imported into android studio as a project and got this error:
cannot find symbol method setHttpProxy(ProxyInfo) and Cannot resolve method 'setHttpProxy(android.net.ProxyInfo)
// Create a new interface using the builder and save the parameters.
final ParcelFileDescriptor vpnInterface;
for (String packageName : mPackages) {
try {
if (mAllow) {
builder.addAllowedApplication(packageName);
} else {
builder.addDisallowedApplication(packageName);
}
} catch (PackageManager.NameNotFoundException e){
Log.w(getTag(), "Package not available: " + packageName, e);
}
}
builder.setSession(mServerName).setConfigureIntent(mConfigureIntent);
if (!TextUtils.isEmpty(mProxyHostName)) {
builder.setHttpProxy(ProxyInfo.buildDirectProxy(mProxyHostName, mProxyHostPort));
}
synchronized (mService) {
vpnInterface = builder.establish();
if (mOnEstablishListener != null) {
mOnEstablishListener.onEstablish(vpnInterface);
}
}
Log.i(getTag(), "New interface: " + vpnInterface + " (" + parameters + ")");
return vpnInterface;
}

If you check the javadocs for the VpnService.Builder class, you will see that the setHttpProxy method is added in API level 29.
The compilation error that you are getting implies that you are compiling the ToyVPN sample against an older Android API level.
You need to get hold of the SDK for Android 10 or later.

unable to determine the MIME type of a file

I'm new to Java and is trying to learn how to determine the MIME type of a file. I'm using Mac OS. Below is the code I came up with. However, when I run the code, the IDE output error:
'/Users/justin/Desktop/Codes Netbean/JavaRandom/xanadu.txt' has an unknown filetype.
Why is this happening? The file does exist. Am I doing something wrong?
public class DeterminingMIMEType {
public static void main(String[] args) {
Path filename = Paths.get("/Users/justin/Desktop/Codes Netbean/JavaRandom/xanadu.txt");
try {
String type = Files.probeContentType(filename);
if (type == null) {
System.err.format("'%s' has an" + " unknown filetype.%n", filename);
} else if (!type.equals("text/plain")) {
System.err.format("'%s' is not" + " a plain text file.%n", filename);
}
} catch (IOException x) {
System.err.println(x);
}
}
}

The documentation for Files reveals that a FileTypeDetector is loaded by ServiceLoader. A wee bit of googling leads to:
http://blog.byjean.eu/java/2013/08/22/making-jdk7-nio-filetypedetection-work-on-mac-osx.html
which says that this is a problem with the default FileTypeDetector provided by the Oracle Java7 jvm for Mac OS.
The link also has a way of providing your own FileTypeDetector, though upgrading to Java 8 (maybe?) also will fix the problem.

Google App Engine Java and Android Getting Started

I've been struggling to get the example running from below:
https://developers.google.com/eclipse/docs/getting_started
The first problem I had was didn't have installed 'Google Cloud Messaging for Android Library' in the Android SDK (obvious I know).
But now I have an issue with the auto-generated code in two files in the Android project:
GCMIntentService.java and RegisterActivity.java
The errors are:
The method getDeviceInfo(String) is undefined for the type Deviceinfoendpoint GCMIntentService.java
The method listMessages() is undefined for the type MessageEndpoint RegisterActivity.java
The method insertDeviceInfo(DeviceInfo) is undefined for the type Deviceinfoendpoint GCMIntentService.java
The method removeDeviceInfo(String) is undefined for the type Deviceinfoendpoint GCMIntentService.java
I'm using Java SDK v1.7.0_15 on Ubuntu but I also tried on Windows 7 with Java SDK v1.6 and had the same issue. Latest Android Platform 4.2.2 and Google App Engine 1.7.7. Eclipse is Juno Service Release 2.
The problem looks like they are doing some casting wrong, because there is a method getDeviceInfo for inner class DeviceInfoEndpoint inside Deviceinfoendpoint (different capatilisations).
I could try and fix it, but just wondering if I have something wrong in my setup for this to be happening?
Any help would be appreciated.

In your GCMIntentService.java class, add .deviceInfoEndpoint() after the endpoint object in the lines with errors as shown below:
DeviceInfo existingInfo = endpoint.getDeviceInfo(registration)
DeviceInfo existingInfo = endpoint.deviceInfoEndpoint().getDeviceInfo(registration)
In RegisterActivity.java change the line
messageEndpoint.listMessages().setLimit(5).execute();
to
messageEndpoint.messageEndpoint().listMessages().setLimit(5).execute();

I would make sure you are using the same version of GCM APIs as you have JARs for. There have been quite a few revisions.
I am using the following code with gcm-server.jar, listed at 19718 bytes.
The code I successfully use to send GCM messages to a device is:
public void sendMessage() {
String notificationToken = mobileDevice.getPushNotificationCode();
String deviceType = mobileDevice.getDeviceType();
Sender sender = new Sender(BROWSER_API_KEY);
Message message = new Message.Builder().addData("message", "blah blah").build();
String device = "<the key for the device you are sending to goes here>";
try {
System.out.println("Sending message...");
Result result = sender.send(message, device, 5);
System.out.println("Done sending message");
if (result.getMessageId() != null) {
System.out.println("Got message ID: " + result.getMessageId());
System.out.println("Got error code name: " + result.getErrorCodeName());
System.out.println("result: " + result);
String canonicalRegId = result.getCanonicalRegistrationId();
if (canonicalRegId != null) {
// Database has more than one record for this device.
// Replace all of this device's records with this new id
System.out.println("Got new canonical reg id: " + canonicalRegId);
}
} else {
String error = result.getErrorCodeName();
if (error.equals(com.google.android.gcm.server.Constants.ERROR_NOT_REGISTERED)) {
// application has been removed from device - unregister from database
System.out.println("Got error: " + error);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}

Java 1.6 has runtime errors reading a file when 1.7 is fine

i have been working on an assignment on my own PC using JDK v1.7, and i have to submit my assignment on my uni's Unix computer with java version 1.6.
All of my code executes fine on my machine, and when i SSH into my uni's computer and transfer my code across, it compiles fine, too. however, when I go to run it, i receive a
NoSuchElementException: No line found
about 1000-1200 characters into the .xml file I need to read (the file is much longer than this).
the offending method is
private CDAlbum CDread(Scanner inLine) {
String tempTitle = "Unknown CD";
String tempGenre = "Unknown Genre";
String tempArtist = "Unknown Artist";
ArrayList<String> tempTracks = new ArrayList<String>();
do {
lineBuffer = inLine.nextLine();
if (lineBuffer.equals("<Title>")) {
tempTitle = inLine.nextLine();
System.out.println("reading in a CD, just read title: " + tempTitle);
} else if (lineBuffer.equals("<Genre>")) {
tempGenre = inLine.nextLine();
} else if (lineBuffer.equals("<Artist>")) {
tempArtist = inLine.nextLine();
//System.out.println("Which has artist: " + tempArtist);
} else if (lineBuffer.equals("<Tracks>")) {
//populate tracks array
lineBuffer = inLine.nextLine();
while (!(lineBuffer.equals("</Tracks>"))) {
tempTracks.add(lineBuffer);
//System.out.println("Read track: " + lineBuffer);
lineBuffer = inLine.nextLine();
}
}
} while (!(lineBuffer.equals("</CD>")));
System.out.println(tempTracks);
CDAlbum tempdisc = new CDAlbum(tempTitle, tempGenre, tempArtist, tempTracks);
return tempdisc;
}
with the error occurring at
lineBuffer = inLine.nextLine();
I'm a bit out of my debugging depth here, and any suggestions as to what could be causing this are welcome.
screenshot of console output: http://puu.sh/YXKN
entire source code (just in case, and because it's easy to do with dropbox): https://www.dropbox.com/sh/zz8vdzqgw296s3d/v_cfW5svHG

Answer not required any more - turns out i was mistaken, and the assignment is being marked on a windows 7 machine running java 1.7.

File Upload in fire fox

Iam not able to upload files in FireFox and safari but iam able to do it successfully in explorer.
When i tried to debug i found out that in case of IE the upload browser is giving the entire file as eg C:\Documents and Settings\jjayashree\My Documents\price.csv
but where as in FF and safari the upload widget is just giving the file name with no extension.
previously code was like this
if (fileName.contains("\")) {
index = fileName.lastIndexOf("\");
}
if (this.fileName != null && this.fileName.trim().length() > 0 && index >= 0) {
this.fileName = this.fileName.substring(index + 1, this.fileName.length());
int dotPosition = fileName.lastIndexOf('.');
String extension = fileName.substring(dotPosition + 1, fileName.length());
try {
if (profileType.equalsIgnoreCase("sampleProfile")) {
if (extension.equalsIgnoreCase("csv")) {
//fileNameTextBox.setText(this.fileName);
this.form.submit();
} else {
new CustomDialogBox(Nexus.INFO_MESSAGE, MessageConstants.SPECIFY_FILE_NAME_MSG).show();
}
}
} catch (Exception e) {
Window.alert("SPECIFY_VALID_FILE_NAME_MSG");
}
} else {
Window.alert("SPECIFY_A_FILE_MSG");
}
i changed it as
if (this.fileName != null && this.fileName.trim().length() > 0) {
this.fileName = this.fileName.substring(this.fileName.lastIndexOf("\") + 1, this.fileName.length());
}
i found it working but when the same is deployed in linux iam getting an error
I also hav a doubt becos in the doPost of servlet iam using fileName.replace("\", "/");
is this the problem. . How wil mozilla encounter this fileName.replace() wil it just see and find nothing can be replced and go or wil it throw any kind of Exception

Maybe try gwtupload? It simplifies file loading to one function call, and handles all the backend for you. It's a little complicated to get working but there's a tutorial on the site on how to do it.
http://code.google.com/p/gwtupload/