Develop Reference

i cant load the form on java gpdr agreement

maybe you know is necesary add this agreement form in android
https://developers.google.com/mobile-ads-sdk/docs/dfp/android/eu-consent
i add this code just above the method onCreate on the main_activity.java
ConsentInformation consentInformation = ConsentInformation.getInstance(this);
String[] publisherIds = {"pub-123"};
ConsentInformation.getInstance(this)
.setConsentStatus(ConsentStatus.PERSONALIZED);
ConsentInformation.getInstance(this).
setDebugGeography(DebugGeography.DEBUG_GEOGRAPHY_EEA);
handler = new Handler();
consentInformation.requestConsentInfoUpdate(publisherIds, new ConsentInfoUpdateListener() {
#Override
public void onConsentInfoUpdated(ConsentStatus consentStatus) {
// User's consent status successfully updated.
}
#Override
public void onFailedToUpdateConsentInfo(String errorDescription) {
// User's consent status failed to update.
}
});
URL privacyUrl = null;
try {
// TODO: Replace with your app's privacy policy URL.
privacyUrl = new URL("https://www.123.com/privacy");
} catch (MalformedURLException e) {
e.printStackTrace();
// Handle error.
}
ConsentForm form = new ConsentForm.Builder(this, privacyUrl)
.withListener(new ConsentFormListener() {
#Override
public void onConsentFormLoaded() {
// Consent form loaded successfully.
}
#Override
public void onConsentFormOpened() {
// Consent form was displayed.
}
#Override
public void onConsentFormClosed(
ConsentStatus consentStatus, Boolean userPrefersAdFree) {
// Consent form was closed.
}
#Override
public void onConsentFormError(String errorDescription) {
// Consent form error.
}
})
.withPersonalizedAdsOption()
.withNonPersonalizedAdsOption()
.withAdFreeOption()
.build();
form.load();
form.show();
but the form dont load when i open the app for testing. Where can be the problem. i assume, the line with: DEBUG_GEOGRAPHY_EEA << define the location of the mobile, but i dont see nothing
thanks for your time !

Validating multiple asyncronous methods in GWT

I am looking at a code that I have to work on. And basically I have to add a validation to a listener of a button.
The code has already multiple validations. They are kind of set in a cascade.
The listener of the buttons calls an asyncCallBack method that if everything is ok, on the onsuccess part of the method calls for the next one, an that one on the next one, until it reaches the end and goes to the next page. I am not a fan of this approach because it is kind of messy. What would the best way to do that using best practices.
An example of the code:
Button btnOK = new Button("Aceptar");
btnOK.addListener(Events.Select, new Listener<ButtonEvent>() {
public void handleEvent(ButtonEvent e) {
myService.getInfo1(1, txt, "N",
new AsyncCallback<List<InfoService>>() {
public void onFailure(Throwable caught) {
// goes back
return
}
public void onSuccess(
List<Object> result) {
// do some validation with the result
validation2();
}
}
}
}
public void validation2(){
myService.getDireccionCanalesElectronicos(id, new AsyncCallback<MyResult>() {
public void onSuccess(MyResult result) {
// do some validation with the result
validation3();
}
...
}
}
public void validation3(){
myService.getDireccionCanalesElectronicos(id, new AsyncCallback<MyResult>() {
public void onSuccess(MyResult result) {
// do some validation with the result
validation4();
}
...
}
}
Is there a better way of doing this, it seems messy and hard to follow. Adding another validation is complicated. It doesnt seem like a good practice.

Create 1 method in the servlet that calls all the validation methods and do just one call in the client ?
public void validation()
{
boolean ok = validation1();
if (ok) ok = validation2();
return validation;
}

Using mirco services is sometimes hard to deal with. As #Knarf mentioned, this is a way to go. But sometime you may want to handle the calls on the client side. Another one will be using this tiny framework: sema4g. It will help you to solve your problem.
A solution might look like that:
First create the sem4g commands:
private SeMa4gCommand createGetInfoCommand() {
return new AsyncCommand() {
// create callback
MethodCallbackProxy<List<InfoService>> proxy = new MethodCallbackProxy<List<InfoService>>(this) {
#Override
protected void onProxyFailure(Method method,
Throwable caught) {
// Enter here the code, that will
// be executed in case of failure
}
#Override
protected void onProxySuccess(Method method,
List<InfoService> response) {
// Enter here the code, that will
// be executed in case of success
}
};
#Override
public void execute() {
// That's the place for the server call ...
myService.getInfo1(1, txt, "N", proxy);
}
};
}
do that for all your calls;
private SeMa4gCommand createCommandGetDireccionCanalesElectronicos() {
return new AsyncCommand() {
// create callback
MethodCallbackProxy<MyResult> proxy = new MethodCallbackProxy<MyResult>(this) {
#Override
protected void onProxyFailure(Method method,
Throwable caught) {
// Enter here the code, that will
// be executed in case of failure
}
#Override
protected void onProxySuccess(Method method,
List<MyResult> response) {
// Enter here the code, that will
// be executed in case of success
}
};
#Override
public void execute() {
// That's the place for the server call ...
myService. getDireccionCanalesElectronicos(id, proxy);
}
};
}
Once you have done this for all your calls, create a sema4g context and run it:
try {
SeMa4g.builder()
.addInitCommand(new InitCommand() {
#Override
public void onStart() {
// Enter here your code, that
// should be executed when
// the context is started
})
.addFinalCommand(new FinalCommand() {
#Override
public void onSuccess() {
// Enter here the code, that will
// be executed in case the context
// ended without error
}
#Override
public void onFailure() {
// Enter here the code, that will
// be executed in case the context
// ended with an error
})
.add(createGetInfoCommand())
.add(createCommandGetDireccionCanalesElectronicos())
.build()
.run();
} catch (SeMa4gException e) {
// Ups, something wrong with the context ...
}
For more informations, read the documentation. If you have questions, feel free to ask: SeMa4g Gitter room.
Hope that helps.

javafx adding multiple strings into TextArea in one method -> Everything is written once at the end

I have a javafx program which I want to use to analyze a website. For the start I just want to print the sourcecode of a site into a TextArea, but before that, I write "loading website sourcecode..."
My target is to write "loading website sourcecode..." first, and then after some seconds when the parsing of the site is finished, add that sourcecode.
At the Moment when I press the button, nothing happens and after 3-5 seconds the "loading website sourcecode..." message and the sourcecode is displayed at once.
So I actually want to show strings one after another. I already googled for 2 hours and tried things with threads, invokelater, platform.runLater() and so on but nothing worked, the code is simple.
ModelView.java - Controller Class
package root;
import javafx.application.Platform;
...
public class ModelView {
#FXML public TextField UrlInput;
// This gets called when the button is pressed
public void checkUrl() throws InterruptedException
{
String url = UrlInput.getText();
LogWriter lw = new LogWriter();
lw.printMsg("loading website sourcecode...");
lw.printMsg(HTMLParser.directUrlToCode(url));
}
}
LogWriter.java
package root;
import javafx.beans.value.ObservableValue;
...
public class LogWriter extends Thread{
#FXML TextArea Log;
public LogWriter()
{
Log = (TextArea) Main.scene.lookup("#Log");
}
void printMsg(String s)
{
Log.setText(this.Log.getText()+"\n"+s);
}
}
EDIT:
There is not much to say about the HTMLParser methods, but I add that it extends Thread.
I tried changing ModelView.java to that:
ModelView.java - version 2
package root;
import javafx.application.Platform;
...
public class ModelView<V> {
#FXML public TextField UrlInput;
// This gets called when the button is pressed
public void checkUrl() throws InterruptedException
{
String url = UrlInput.getText();
LogWriter lw0 = new LogWriter();
lw0.start();
lw0.printMsg("loading website sourcecode...");
HTMLParser hp = new HTMLParser();
hp.start();
LogWriter lw1 = new LogWriter();
lw1.start();
lw1.printMsg(hp.directUrlToCode(url));
}
}
Still the same effect.
EDIT2:
This is another version I tried, in this case, "loading website sourcecode..." is not even displaying, I am going on with my tries...
ModelView.java checkUrl() - Version 3
public void checkUrl() throws InterruptedException
{
String url = UrlInput.getText();
Task<Void> task = new Task<Void>(){
#Override protected Void call() throws Exception {
if(isCancelled()) {
updateMessage("Cancelled");
LogWriter lw = new LogWriter();
lw.printMsg("loading website sourcecode...");
}
return null;
}
};
Thread t = new Thread(task);
t.start();
HTMLParser hp = new HTMLParser();
LogWriter lw1 = new LogWriter();
lw1.printMsg(hp.directUrlToCode(url));
}

First of all, manipulating an observable variable from outside of the JavaFX application thread is a bad idea. You won't be able to bind other variables to it (you'll get IllegalStateExceptions)
Second, I'd implement LogWriter like this:
// ...
public class LogWriter {
private final TextArea txtLog;
public LogWriter(TextArea txtLog) {
this.txtLog = txtLog;
}
void printMsg(final String s) {
if (!Platform.isFxApplicationThread()) {
Platform.runLater(new Runnable() {
#Override
public void run() {
printMsg(s);
}
});
} else {
txtLog.setText(txtLog.getText() + "\n" + s);
}
}
}
and use it this way:
//...
#FXML
private TextArea txtLog;
// ...
public void checkUrl() {
final String url = UrlInput.getText();
final LogWriter lw = new LogWriter(txtLog);
Task<String> task = new Task<String>() {
#Override
protected String call() {
lw.printMsg("loading website sourcecode...");
return HTMLParser.directUrlToCode(url);
}
#Override
protected void succeeded() {
super.succeeded();
lw.printMsg(getValue());
}
#Override
protected void failed() {
super.failed();
if (getException() != null) {
getException().printStackTrace();
}
lw.printMsg("failed!");
}
};
new Thread(task).start();
}
Note that HTMLParser does not need to extend Thread.

Passing function as a parameter in java

I'm getting familiar with Android framework and Java and wanted to create a general "NetworkHelper" class which would handle most of the networking code enabling me to just call web-pages from it.
I followed this article from the developer.android.com to create my networking class: http://developer.android.com/training/basics/network-ops/connecting.html
Code:
package com.example.androidapp;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.util.Log;
/**
* #author tuomas
* This class provides basic helper functions and features for network communication.
*/
public class NetworkHelper
{
private Context mContext;
public NetworkHelper(Context mContext)
{
//get context
this.mContext = mContext;
}
/**
* Checks if the network connection is available.
*/
public boolean checkConnection()
{
//checks if the network connection exists and works as should be
ConnectivityManager connMgr = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
{
//network connection works
Log.v("log", "Network connection works");
return true;
}
else
{
//network connection won't work
Log.v("log", "Network connection won't work");
return false;
}
}
public void downloadUrl(String stringUrl)
{
new DownloadWebpageTask().execute(stringUrl);
}
//actual code to handle download
private class DownloadWebpageTask extends AsyncTask<String, Void, String>
{
#Override
protected String doInBackground(String... urls)
{
// params comes from the execute() call: params[0] is the url.
try {
return downloadUrl(urls[0]);
} catch (IOException e) {
return "Unable to retrieve web page. URL may be invalid.";
}
}
// Given a URL, establishes an HttpUrlConnection and retrieves
// the web page content as a InputStream, which it returns as
// a string.
private String downloadUrl(String myurl) throws IOException
{
InputStream is = null;
// Only display the first 500 characters of the retrieved
// web page content.
int len = 500;
try {
URL url = new URL(myurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 );
conn.setConnectTimeout(15000);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.d("log", "The response is: " + response);
is = conn.getInputStream();
// Convert the InputStream into a string
String contentAsString = readIt(is, len);
return contentAsString;
// Makes sure that the InputStream is closed after the app is
// finished using it.
} finally {
if (is != null) {
is.close();
}
}
}
// Reads an InputStream and converts it to a String.
public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException
{
Reader reader = null;
reader = new InputStreamReader(stream, "UTF-8");
char[] buffer = new char[len];
reader.read(buffer);
return new String(buffer);
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(String result)
{
//textView.setText(result);
Log.v("log", result);
}
}
}
In my activity class I use the class this way:
connHelper = new NetworkHelper(this);
...
if (connHelper.checkConnection())
{
//connection ok, download the webpage from provided url
connHelper.downloadUrl(stringUrl);
}
Problem I'm having is that I should somehow make a callback back to the activity and it should be definable in "downloadUrl()" function. For example when download finishes, public void "handleWebpage(String data)" function in activity is called with loaded string as its parameter.
I did some googling and found that I should somehow use interfaces to achieve this functionality. After reviewing few similar stackoverflow questions/answers I didn't get it working and I'm not sure if I understood interfaces properly: How do I pass method as a parameter in Java? To be honest using the anonymous classes is new for me and I'm not really sure where or how I should apply the example code snippets in the mentioned thread.
So my question is how I could pass the callback function to my network class and call it after download finishes? Where the interface declaration goes, implements keyword and so on?
Please note that I'm beginner with Java (have other programming background though) so I'd appreciate a throughout explanation :) Thank you!

Use a callback interface or an abstract class with abstract callback methods.
Callback interface example:
public class SampleActivity extends Activity {
//define callback interface
interface MyCallbackInterface {
void onDownloadFinished(String result);
}
//your method slightly modified to take callback into account
public void downloadUrl(String stringUrl, MyCallbackInterface callback) {
new DownloadWebpageTask(callback).execute(stringUrl);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//example to modified downloadUrl method
downloadUrl("http://google.com", new MyCallbackInterface() {
#Override
public void onDownloadFinished(String result) {
// Do something when download finished
}
});
}
//your async task class
private class DownloadWebpageTask extends AsyncTask<String, Void, String> {
final MyCallbackInterface callback;
DownloadWebpageTask(MyCallbackInterface callback) {
this.callback = callback;
}
#Override
protected void onPostExecute(String result) {
callback.onDownloadFinished(result);
}
//except for this leave your code for this class untouched...
}
}
The second option is even more concise. You do not even have to define an abstract method for "onDownloaded event" as onPostExecute does exactly what is needed. Simply extend your DownloadWebpageTask with an anonymous inline class inside your downloadUrl method.
//your method slightly modified to take callback into account
public void downloadUrl(String stringUrl, final MyCallbackInterface callback) {
new DownloadWebpageTask() {
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
callback.onDownloadFinished(result);
}
}.execute(stringUrl);
}
//...

NO interface, NO lib, NO Java 8 needed!
Just using Callable<V> from java.util.concurrent
public static void superMethod(String simpleParam, Callable<Void> methodParam) {
//your logic code [...]
//call methodParam
try {
methodParam.call();
} catch (Exception e) {
e.printStackTrace();
}
}
How to use it:
superMethod("Hello world", new Callable<Void>() {
public Void call() {
myParamMethod();
return null;
}
}
);
Where myParamMethod() is our passed method as parameter (in this case methodParam).

Yes, an interface is the best way IMHO. For example, GWT uses the command pattern with an interface like this:
public interface Command{
void execute();
}
In this way, you can pass function from a method to another
public void foo(Command cmd){
...
cmd.execute();
}
public void bar(){
foo(new Command(){
void execute(){
//do something
}
});
}

The out of the box solution is that this is not possible in Java. Java does not accept Higher-order functions. It can be achieved though by some "tricks". Normally the interface is the one used as you saw. Please take a look here for further information. You can also use reflection to achieve it, but this is error prone.

Using Interfaces may be the best way in Java Coding Architecture.
But, passing a Runnable object could work as well, and it would be much more practical and flexible, I think.
SomeProcess sp;
public void initSomeProcess(Runnable callbackProcessOnFailed) {
final Runnable runOnFailed = callbackProcessOnFailed;
sp = new SomeProcess();
sp.settingSomeVars = someVars;
sp.setProcessListener = new SomeProcessListener() {
public void OnDone() {
Log.d(TAG,"done");
}
public void OnFailed(){
Log.d(TAG,"failed");
//call callback if it is set
if (runOnFailed!=null) {
Handler h = new Handler();
h.post(runOnFailed);
}
}
};
}
/****/
initSomeProcess(new Runnable() {
#Override
public void run() {
/* callback routines here */
}
});

Reflection is never a good idea since it's harder to read and debug, but if you are 100% sure what you're doing, you can simply call something like set_method(R.id.button_profile_edit, "toggle_edit") to attach a method to a view. This is useful in fragment, but again, some people would consider it as anti-pattern so be warned.
public void set_method(int id, final String a_method)
{
set_listener(id, new View.OnClickListener() {
public void onClick(View v) {
try {
Method method = fragment.getClass().getMethod(a_method, null);
method.invoke(fragment, null);
} catch (Exception e) {
Debug.log_exception(e, "METHOD");
}
}
});
}
public void set_listener(int id, View.OnClickListener listener)
{
if (root == null) {
Debug.log("WARNING fragment", "root is null - listener not set");
return;
}
View view = root.findViewById(id);
view.setOnClickListener(listener);
}

Interface callback support generic type.
In Callbackable.java
public interface Callbackable<T> {
void call(T obj);
}
How to use:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
doSomeNetworkAction(new Callbackable<Integer>() {
#Override
public void call(Integer obj) {
System.out.println("have received: " + obj + " from network");
}
});
}
// You can change Integer to String or to any model class like Customer, Profile, Address...
public void doSomeNetworkAction(Callbackable<Integer> callback) {
// acb xyz...
callback.call(666);
}
}

Creating a table using GWTP

I'm getting acquainted with GWTP. I tried to output a table, that would contain the JSON values, taken with a help of Piriti mappers. It's not a real project's code, it's just an attempt to understand GWTP, so this may be not the most beautiful solution (in fact, it's not one for sure). Here are the two presenters that are involved in this procedure:
The FirstPresenter (that uses ProductListPresenter, that is a widget, I'm not sure that widget should be used here, but, according to this conversation, widget may do the trick):
public class FirstPresenter extends
Presenter<FirstPresenter.MyView, FirstPresenter.MyProxy> {
public static final Object SLOT_RATE = new Object();
public static final Object SLOT_PRODUCT = new Object();
private IndirectProvider<ProductListPresenter> productListFactory;
public interface MyView extends View {
public Panel getListProductPanel();
}
#Inject ProductListPresenter productListPresenter;
#ProxyCodeSplit
#NameToken(NameTokens.first)
public interface MyProxy extends ProxyPlace<FirstPresenter> {
}
#Inject
public FirstPresenter(final EventBus eventBus, final MyView view,
final MyProxy proxy, Provider<ProductListPresenter> productListFactory) {
super(eventBus, view, proxy);
this.productListFactory = new StandardProvider<ProductListPresenter>(productListFactory);
}
#Override
protected void revealInParent() {
}
#Override
protected void onBind() {
super.onBind();
}
#Inject
PlaceManager placeManager;
#Override
protected void onReset() {
super.onReset();
setInSlot(SLOT_PRODUCT, null);
for (int i = 0; i < 2; i++) { //TODO: change hardcoded value
productListFactory.get(new AsyncCallback<ProductListPresenter>() {
#Override
public void onSuccess(ProductListPresenter result) {
addToSlot(SLOT_PRODUCT, result);
}
#Override
public void onFailure(Throwable caught) {
}
});
}
}
}
The ProductListPresenter:
public class ProductListPresenter extends
PresenterWidget<ProductListPresenter.MyView> {
#Inject ProductListPiritiJsonReader reader;
public interface MyView extends View {
public Label getNameLabel();
public Label getCompanyLabel();
public Label getSerialLabel();
public Label getPricesLabel();
}
#Inject
public ProductListPresenter(final EventBus eventBus, final MyView view) {
super(eventBus, view);
}
#Override
protected void onBind() {
super.onBind();
}
#Override
protected void onReset() {
super.onReset();
try {
RequestBuilder rb = new RequestBuilder(RequestBuilder.GET, "/jsongwtproject/products.json");
rb.setCallback(new RequestCallback() {
#Override
public void onResponseReceived(Request request, Response response) {
ProductList productList = reader.read(response.getText());
for (Product product : productList.getProductList()) {
fetchDataFromServer();
}
}
#Override
public void onError(Request request, Throwable exception) {
Window.alert("Error occurred" + exception.getMessage());
}
});
rb.send();
}
catch (RequestException e) {
Window.alert("Error occurred" + e.getMessage());
}
}
//Takes the JSON string and uses showProductListData(String jsonString) method
public void fetchDataFromServer() {
try {
RequestBuilder rb = new RequestBuilder(RequestBuilder.GET, "/jsongwtpproject/products.json");
rb.setCallback(new RequestCallback() {
#Override
public void onResponseReceived(Request request, Response response) {
showProductListData(response.getText());
}
#Override
public void onError(Request request, Throwable exception) {
Window.alert("Error occurred" + exception.getMessage());
}
});
rb.send();
}
catch (RequestException e) {
Window.alert("Error occurred" + e.getMessage());
}
}
//Uses Piriti mappers to take JSON values
private void showProductListData(String jsonString) {
ProductList productList = reader.read(jsonString);
for (Product product : productList.getProductList()) {
StringBuffer priceSb = new StringBuffer();
for (Double price : product.getPrices()) {
priceSb.append(price + ", ");
}
getView().getNameLabel().setText(product.getName());
getView().getCompanyLabel().setText(product.getCompany());
getView().getSerialLabel().setText(product.getSerialNumber());
getView().getPricesLabel().setText(priceSb.toString());
//break;
}
}
}
And the ProductListView.ui.xml:
<g:HTMLPanel>
<table border="1">
<tr>
<td><g:Label ui:field="nameLabel" /> </td>
<td><g:Label ui:field="companyLabel" /> </td>
<td><g:Label ui:field="serialLabel" /> </td>
<td><g:Label ui:field="pricesLabel" /> </td>
</tr>
</table>
</g:HTMLPanel>
Currrently there are two products in the JSON.
Here is what happens with this code: the first row with Product1 appears, then it changes to the first row that contains Product2's values, then again it contains Product1's values, then again Product2's, after that the second row with Product1 appears, then it changes to the second row that contains Product2's values, then again it contains Product1's values, then again Product2's.
So, there are two products and two rows, and in this code the values are changed twice, but in the end the table contains only Product2's values. If the break; is uncommented, Product1's values output twice in the first row, then in the second row, then the table contain only these Product1's values.
I do understand why that happens. But I haven't yet figured out how to make the correct output. It'd be great if someone could tell me how to do the correct output, or, well, provide an example (or would tell me which part, e.g. the widget usage, is terribly wrong).

The problem with your code is that you really don't have a real table in your ProductListView.ui.xml.
Of course if there were two records retrieved from the server, this part of the code is called twice:
getView().getNameLabel().setText(product.getName());
getView().getCompanyLabel().setText(product.getCompany());
getView().getSerialLabel().setText(product.getSerialNumber());
getView().getPricesLabel().setText(priceSb.toString());
the second call overwriting the value from the first call.
Points to improve your code:
You may want to read about CellTable for creating a real table view.
Do not use the PresenterWidget itself as data holder, instead create
a DTO that will be pass to the database and use this to retrieve the
data.