What is MIDlet life cycle?
The MIDlet lifecycle is the fundamental for creation of any MIDlet. The lifecycle includes the execution states such as creation, start, pause and exiting operations and a set of valid transitions. To manage the downloading and lifecycle of MIDlets, there is software by name Application Management Software.
What is MIDlet in mobile computing?
A MIDlet is an application that uses the mobile information device profile (MIDP) for the Java Platform, Micro Edition (Java ME) environment. When Java was the most widely used mobile platform, the MIDlet became the most ubiquitous of mobile applications.
What are the various languages used for MIDlet programming?
In WAP, Java Servlets and Java Server Pages (JSPs) can be used to generate Wireless Markup Language (WML) pages dynamically, and in MIDP, applications (also called MIDlets) are written in the Java programing language.
What is the base class for J2ME project?
J2ME APIs. HelloWorld extended the MIDlet class and contains references to a Display object (theDisplay) and a TextBox object (mainScreen). TextBox extends the Screen class, which is the base class for all high-level GUIs. Low-level displays, where the programmer must define his own graphics, extend the Canvas class.
What are the three states of MIDlet?
These states are active, paused and destroyed. As you can see from Figure 11, an installed MIDlet is put into a paused state by the AMS creating an instance of it, by calling its no-args constructor.
What is MIDlet Suite and explain the life cycle of MIDlet in detail?
The life-cycle defines the execution states of a MIDlet – creation, start, pause, and exit – and the valid state transitions. The AMS provides the runtime environment for a MIDlet. It enforces security, permissions, and execution states, and provides system classes and scheduling.
What are JAD files?
Sun Microsystems, Inc. Java Application Descriptor (JAD) files describe the MIDlets (Java ME applications) that are distributed as JAR files. JAD files are commonly used to package Java applications or games that can be downloaded to mobile phones.
What is the use of J2ME?
J2ME (Java 2 Platform, Micro Edition) is a technology that allows programmers to use the Java programming language and related tools to develop programs for mobile wireless information devices such as cellular phones and personal digital assistants (PDAs).
Why do we need to use commandAction () method?
The commandAction() method is typically invoked in the context of the thread that is responsible for managing the user interface and therefore any delay caused by this method may cause the user interface to appear to be unresponsive.