How to display a page only links are initialized

Hi all.

We develop an application using JDeveloper with Android 5.0.1 (API 21) 12.1.3.

We use the AMPA, the list of projects to a REST Service and persist locally (in order to work in offline mode).

We have a feature, implemented as a workflow of the MAF. Inside of the flow of the task, we have an AMX page, which shows the details of the first element of a collection of projects (we can change the selection of the projects of the springboard).

The problem is that we cannot get the first draft of the list, when the service is rendered first.

We tried the following approaches:

1. drag and drop the attribute of the data control as an OutputTest inside the amx page. The value of the output text is empty.

2. get the value of the OutputText of a managed bean. Inside of the managed bean, we try to assess the EL expression for the attributeBinding.

3. get the first project within a method call on the taskflow. The steps to achieve this are:

-Add a method call on the taskflow and set it as entry point.

-A reference to a bean pageFlowScope method

-Create a page of def for the method call, where we added the iterator for an attributeBinding and projects (for example: projectName).

-Inside the pageFlowScope bean java method, we tried:

-get the ProjectName, by evaluating the Expression Language: AdfmfJavaUtilities.evaluateELExpression("#{bindings.projectName.inputValue}"). This return is null.

-get the iterator and retrieves the first line. The iterator is empty and there was no line.

4. We also tried drag and drop the 'first' operation of the project collection of data as a method control give the floor to the taskflow and then repeat the steps from point 3.

When you use the debugger, we noticed that if we have a breakpoint in our java code, we can get a decent result with some of the approaches above. This lead us to the conclusion that somehow, the page is rendered before the data control is to fill.

Do you know if there is a way to get the information for a project, the first time the feature is made? The data control is completed after the amx page is rendered?

Please let me know if there are any details that I forgot to mention.

Thank you.

OK, let me explain what happens: by default, AMPA retrieves the data in the background. When data recovery is complete, it refreshes the user interface using getProviderChangeSupport () .fireProviderRefresh ("listName").

Unfortunately, this discount only works if a list is displayed in the user interface, with a form of layout as you use data is not refreshed. The only way to refresh with formatting is to refresh the iterator binding. It's a little embarrassing because service class should be ignorant of the link layer. So, to solve this problem, you have two options:

n ' is more to read data in the background by setting the attribute remoteReadInBackground = "false" in the persistence - mapping.xml. This will block the user interface until the data is retrieved

-override the refreshEntityList method and add code to upgrade your iterator binding. For examnple, if your binder iterator is called projectIterator, you can add the following code to your ProjectService class:

@Override

protected void refreshEntityList ( oldEntityList from the list)

{

super.refreshEntityList (oldEntityList);

Ib = AmxIteratorBinding

(AmxIteratorBinding) AdfmfJavaUtilities.evaluateELExpression("#{bindings.projectIterator}");

If (ib! = null)

{

Object rowKey = ib.getIterator () .getCurrentRowKey ();

IB. Refresh();

If (rowKey! = null)

{

ib.getIterator () .setCurrentIndexWithKey (rowKey);

}

}

}

In the next version of the AMPA, we will include this fix despite the fact that we do not like to access the iterator binding here. But as you probably agree, this is better than the current behavior of confusion.

Steven Davelaar,

Oracle Mobile A-team.

Tags: Oracle Mobile

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