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Is there a Simple Way to Take Screenshot in Espresso Android Studio for Every Test Case

Guys, I'm a beginner in Espresso and requesting for your valuable help, Can anyone share me the code with which I can take the screenshot for every tests which I executing ?

I'll try to guide based on the info you provided.
First you need to to know the name of your test case.
Second i will assume that you already have granted write/read external storage
Third i'll assume you also have UI Automator dependency added.
So the implementation would be something like this:
object ScreenshotUtil : TestWatcher() {
lateinit var description: Description
override fun starting(description: Description) {
super.starting(description)
this.description = description
}
fun captureScreenshot() {
val capture = Screenshot.capture()
capture.format = Bitmap.CompressFormat.PNG
capture.name = description.methodName
val processors = HashSet<ScreenCaptureProcessor>()
processors.add(BasicScreenCaptureProcessor())
try {
capture.process(processors)
} catch (e: IOException) {
throw IllegalStateException(e)
}
}
}
Then you could use it like this:
ScreenshotUtil.captureScreenshot()

jnotify - anything else to use instead of Thread.Sleep when file is detected

I am really needing some help on this.
I have adopted the JNOTIFY approach to detecting any new files in a directory. When the file arrives the Listener informs that a new file is in the location.
#BeforeTest(alwaysRun=true)
public void Polling() throws Exception {
ListenToNotifications.checkFolderPickup();
}
I have attempted this where I addded a call to my Setup function in order to call my setup function after the file is detected.
//snippet from Listener Class from checkFolderPickup();
public void fileCreated(int wd, String rootPath, String name) {
print("New File just created " + rootPath + " : " + name);
Thread.currentThread().setContextClassLoader( getClass().getClassLoader() );
try {
BaseTest.setup();
} catch (Exception e) {
e.printStackTrace();
}
}
My question is //Thread.sleep(1000000) i feel this is not a safe approach and I wanted to know if there is any other approach that I could possibly use instead of a Thread.Sleep, because this function will have to be executed once each time a new file is available and the old file will be deleted eventually and so on, I cannot make the Sleep to short , it will just ignore and continue with Base.Setup()
public static void checkFolderPickup() throws Exception {
...removed other code
boolean watchSubtree = true;
int watchID = JNotify.addWatch(path, mask, watchSubtree, new Listener());
//Thread.sleep(1000000);
Thread.sleep(20000);
boolean res = JNotify.removeWatch(watchID);
if (!res) {
// invalid watch ID specified.
}
}
I basically need my framework to keep polling that directory and each time it will execute the base setup process and follow a workflow, delete the file then poll again and so on.
Can anyone please advise?

You don't need any other modules , you can use custom expected condition:##
using:
import java.io.File;
define the method inside any pageobject class:
private ExpectedCondition<Boolean> newfilepresent() {
return new ExpectedCondition<Boolean>() {
#Override
public Boolean apply(WebDriver driver) {
File f = new File("D:\\workplace");
return f.listFiles().length>1;
}
#Override
public String toString() {
return String.format("wait for new file to be present within the time specified");
}
};
}
we created a custom expected condition method now use it as:
and in code wait like:
wait.until(pageobject.filepresent());
Output:
Failed:
Passed

Once you register a watch on a directory with JNotify, it will continue to deliver events for files in that directory. You should not remove the watch if you wish to continue to receive events for that directory.

How to call Java method (custom class) with an interface typed parameter in Nativescript

I'm creating a Nativescript plugin. It includes a custom Android Library (AAR) and I want to use it from the Typescript code. When I run a demo (in device or emulator) I get a TypeError: sender.registerListener is not a function error when calling this registerListener method, which is weird because I'm able to call other methods of the same object.
I think that it could be because I am not implementing properly the interface required as parameter. I think that I can explain it better with code:
Sender.java: the public class I will use in Typescript:
package com.berriart.android.myplugin;
public class Sender {
public static final String TAG = "Sender";
private Context _context = null;
public Sender(Context context) {
_context = context;
}
public void send(final String messagePath, final String messageToSend) {
if (Log.isLoggable(TAG, Log.INFO)) {
Log.i(TAG, "Send call: " + messagePath + " " + messageToSend);
}
}
public void registerListener(MessageListener listener) {
if (Log.isLoggable(TAG, Log.INFO)) {
Log.i(TAG, "registerListener");
}
}
// Other code here
}
MessageListener.java: the interface that must be implemented by the registerListener parameter:
package com.berriart.android.myplugin;
public interface MessageListener {
void receive(String messagePath, String messageReceived);
}
This is the Typescript (Nativescript) code of the plugin ( to ):
import * as app from "tns-core-modules/application";
export class WearMessaging {
public static send(messagePath: string, messageToSend: string) {
let sender = new com.berriart.android.myplugin.Sender(app.android.context);
sender.send(messagePath, messageToSend);
}
public static registerListener(receiveCallback: (messagePath: string, messageReceived: string) => void) {
let messageListener = new com.berriart.android.myplugin.MessageListener({
receive: receiveCallback
});
let sender = new com.berriart.android.myplugin.Sender(app.android.context);
sender.registerListener(messageListener);
}
}
If I include WearMessaging.send("/demo", "Hola"); in my nativescript application it compiles and run properly, it's call the Java method successfuly. But if I run:
WearMessaging.registerListener((messagePath: string, messageReceived: string) => {
console.log(messagePath);
console.log(messageReceived);
});
The application stops at run time and throws: TypeError: sender.registerListener is not a function refering to the myplugin.android.ts file.
I'm getting crazy trying to make this work, so, let me know if you have any clue. As I say I think that is because I'm missing something when implementing the interface and because the parameter type do not match them method is not being recognized, but maybe I'm wrong.
Here you can see some official doc:
https://docs.nativescript.org/runtimes/android/generator/extend-class-interface
Thanks in advance.

Ok, I solved it :S
It seems that the incremental build was doing something wrong. After deleting manually the build files of the demo everything went fine:
rm -rf platforms/android/build/*
rm -rf platforms/android/app/build/*
# Then build & deploy again
So, question code seems to be fine if you need to do something similar.

Java code to handle node failure in jgroups cluster

My Jgroups config file contains the protocol/config
<FD timeout="3000" max_tries="3" />
But how do I use this in the Java code. For example, if there is a cluster and when I detect a failure I want to call an external notifier service via a REST call, like /nodeDown/nodeID
I'm not able to find any java code which does this, all I see is message receive and send, is there a way I can implement this?
Thanks
Adding some more info
I have done the step of writing a RecieverAdpater and override the start, stop, send, recieve method. Please find some code here,
public void receive(Message msg) {
JGroupsDataPacket pckt = (JGroupsDataPacket) msg.getObject();
if ( pckt.getCmd().equals("cacheUpdate") ){
int uid = pckt.getAffectedUid();
cacheUpdateRoutine(uid);
}
if ( pckt.getCmd().equals("ack") ){
System.out.println("got the mesaage!");
}
logger.log(LogLevel.ERROR, "received msg from " + msg.getSrc() + ": " + msg.getObject());
}
public void send(JGroupsDataPacket pckt){
Message msg = new Message(null, null, pckt);
msg.setFlag(Message.Flag.RSVP);
try {
channel.send(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
I want to know where should I add code for example to handle the TimeOutException when I'm sending a message with the RSVP flag enabled. Another requirement is to know, which is the Java callback method which is called when SUSPECT(P) is triggered. I want to catch and handle the machine's going down, timout etc.
Is the viewAccepted() the only place where I can handle this? Is there a sample code around this?
Also is http://www.jgroups.org/manual/html/user-channel.html
the section 3. APIs give all java/programmatic things we can do with JGroups.
Thanks again
I found some documentation here, I think this is the class which I'm supposed to override
public interface MembershipListener {
void viewAccepted(View new_view);
void suspect(Object suspected_mbr);
void block();
void unblock();
}

OK, first off, you have a JChannel. You need to use it to register for view callbacks, like this:
JChannel ch;
ch.setReceiver(this);
'this' extends ReceiverAdapter and overrides viewAccepted():
public void viewAccepted(View view) {
// handle new view
}
To determine the members which left between views v1 and v2:
List<Address> left_mbrs=View.leftMembers(v1,v2);

Migration to wicket 1.5 - resource (path) issue

I got the task to migrate to wicket 1.4 to wicket 1.5. Despite lack of information in migration guide I was somehow able to refactor most issues. Unfortunetly I'm stuck with "resource" - atm I'm getting this error
java.lang.IllegalArgumentException: Argument 'resource' may not be null.
What I understand by that is that something was change and wicket can no longer "get" to my resources. So I used to have (in wicket 1.4) that piece of code that was responsible for creating image and passing it (the method is in class that extends WebPage) :
private void addImageLogo() {
Resource res = new Resource() {
#Override
public IResourceStream getResourceStream() {
String logo = ConfigurationManager.getInstance().getPathValue(ConfigurationManager.LOGO_FILE_PATH);
return new FileResourceStream(new File(logo));
};
Image logo = new Image("logo", res);
add(logo);
}
Now Resource class no longer exists or I can't find it. While searching internet I was able to change it into this
private void addImageLogo() {
String logoTxt = ConfigurationManager.getInstance().getPathValue(ConfigurationManager.LOGO_FILE_PATH);
ResourceReference res = new ResourceReference(logoTxt) {
#Override
public IResource getResource() {
return null;
}
};
Image logo = new Image("logo", res);
add(logo);
}
This is responsible for obtaining path (and its working): ConfigurationManager.getInstance().getPathValue(ConfigurationManager.LOGO_FILE_PATH)
Unfortunetly I'm still getting this error that I mentioned above. The method getResource() generated automaticly and I believe this is an issue because I'm retuning null but I have no idea what (or how) should I return.

Since it worked with a IResourceStream in 1.4.x then you can just use org.apache.wicket.request.resource.ResourceStreamResource as a IResource for the Image.
Your first code snippet is not complete so I cannot give you exact replacement code.