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The methods of this class allow the application management software to create, start, pause, and destroy a MIDlet. A MIDlet is a set of classes designed to be run and controlled by the application management software via this interface.

The states allow the application management software to manage the activities of multiple MIDlets within a runtime environment. It can select which MIDlet s are active at a given time by starting and pausing them individually. The MIDlet implements these methods to update its internal activities and resource usage as directed by the application management software.

The MIDlet can initiate some state changes itself and notifies the application management software of those state changes by invoking the appropriate methods.

Note: The methods on this interface signal state changes. The state change is not considered complete until the state change method has returned. It is intended that these methods return quickly. Method Summary int checkPermission String permission Get the status of the specified permission. String getAppProperty String key Provides a MIDlet with a mechanism to retrieve named properties from the application management software.

Methods inherited from class java. In the Active state the MIDlet may hold resources. The method will only be called when the MIDlet is in the Paused state.

Two kinds of failures can prevent the service from starting, transient and non-transient. For non-transient failures the notifyDestroyed method should be called. Its destroyApp will be called allowing the MIDlet to cleanup. In the Paused state the MIDlet must release shared resources and become quiescent. This method will only be called called when the MIDlet is in the Active state. Use the wizard to navigate to the examples directory.

Select this directory and click Finish to complete the mount process. The examples filesystem appears in the Filesystems tab of the Explorer pane. Right-click on the examples filesystem, then choose New Java Package. Name the package myconverter. Click Finish. A package myconverter is created inside the mounted filesystem examples. When you build a MIDlet suite, the tool automatically creates the necessary JAR file that contains the application files.

To create a MIDlet Suite:. In the Filesystems window, right-click the myconverter package. Then click Next. Name the new MIDlet suite converter. Notice that you need to capitalize the "C" in the name. The displayable name is the name a mobile device user will see when using the application on a mobile device. Notice that the ConverterMIDlet icon in the Explorer tab has a set of small red x's and 0's next to it. This badge signifies that the MIDlet needs to be compiled.

You can write the code for a MIDlet in one of two ways: either by directly entering code in the Source Editor or by using the tool functions to add methods, fields, constructors, initializers, classes, and interfaces. Typically, you use the tool to add new fields and methods to a class, or modify existing fields and methods, and then later fine-tune the code directly in the Source Editor.

The following procedure shows you how to use the tool and the Source Editor to enter or change code. However, to save time and effort, you can also copy the converter code from the example you installed in Chapter 2.

Enter the name of the new field, storedDataStr , in the Name box and select its type, String , from the Type combo box. In the Modifiers box, select the type of access for the field, private, from the Access combo box. Check the other modifiers for the field, which in this case is static. Set the initial value for storedDataStr to "ConverterData". The field is added to the code in the Source Editor window.

Tip - You can use the Add Field dialog box, copy the text from this page, or from the installed Currency Converter application, and paste it in the Source Editor. Update: in this phase the AMS is capable to detect and inform if there is an update available for an already installed MIDlet.

Once it detects an update, it should inform the user whether to update the application or not. It will ask for confirmation from the user before deleting the MIDlet. There are 3 states in the lifecycle of a MIDlet Active Paused Destroyed When the application is loaded, it starts in a Paused state, when the application starts its execution it is transitioned to Active state.

Now, in this new perspective we can right click on the project explorer and create a new MIDlet project Select a name for our MIDlet project i. Click Next In the following screen you can define the folder for the source code, libraries. Three protected methods: destroyApp , startApp and pauseApp. Like us on Facebook Wideskills.



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