Starting MicroUI¶

To get started, first we need to add MicroUI, a Foundation Library that provides an Abstraction Layer to access the low-level UI inputs and outputs.
Look for module.ivy, and replace dependencies with the following:
```
<dependencies>
   <dependency org="ej.api" name="microui" rev="3.4.1"/>
</dependencies>
```
Note

There’s no need to add EDC as a dependency. It will be automatically resolved with the correct version (as a dependency of the MicroUI library).
This call initializes the MicroUI framework and starts the UI Thread, which manages the user input and display events.
```
public static void main(String[] args) {
   MicroUI.start();
}
```
Note

MicroUI has to be started before any UI operations.
To run your code on the Simulator, left click on the Project Go To Run > Run As > MicroEJ Application.

Note

If you have several VEE Ports you will be asked which to use.

Widgets¶

The widget library provides a collection of common widgets and containers. It is based on MWT, a base library that defines core type graphical elements for designing rich graphical user interface embedded applications.
Look for module.ivy, and replace dependencies with the following:
```
<dependencies>
   <dependency org="ej.library.ui" name="widget" rev="5.0.0" />
</dependencies>
```
Note

There’s no need to add MWT or MicroUI, as both are dependencies of the Widget library. They will be automatically resolved with the correct version.

Desktop Usage¶

A desktop is the top-level object that can be displayed on a Display. It may contain a widget, and at most one desktop is shown on a Display at any given time.

Desktop automatically triggers the layout and rendering phases for itself and its children.

public static void main(String[] args) {
   MicroUI.start();

   Desktop desktop = new Desktop();
   desktop.requestShow();
}

Displaying a Label¶

To add a label, just instantiate a Label object and add it to the desktop as the root widget.

public static void main(String[] args) {
   MicroUI.start();
   Desktop desktop = new Desktop();

   Label label = new Label("Hello World");
   desktop.setWidget(label);

   desktop.requestShow();
}

To run the code go to the Main.java file and right click it, hover over Run As and select MicroEJ Application.

Next step: Basic Drawing on Screen