At this point, we are interested only in checking for text-based updates, so we use the ContentConnection class (instead of the usual HttpConnection class). With the help of this class, we check for the presence of an updatedText.txt file on the server. If such a file is found, we read it, using a DataInputStream, into a byte array and convert it into a string. At any stage, if an error occurs, the error handler takes over.
As you can see, instead of using the ContentConnection, we use the HttpConnection class to update the image. If we find an image and its size is greater than 0, we download it into a byte buffer using a DataInputStream instance. Using the Image.createImage() method, we create this image in memory and then update the ImageItem to use this new image.
download facebook handler jad
It is expected that an update process on the server would keep the text file or the image file only if updates were available. This would be an offline process and part of the update routines. We could modify our code to notify the user that there are no updates available, instead of letting the error handler handle it.
By providing a URL that ends in .jad (in our case, :8080/UpdateArticle.jad) and has the same file name as the currently installed application, the device understands that a request is being made to update the application itself. If the .jad file (and the associated .jar file) is found, and it is determined to be valid, the device will start the download/install/update cycle automatically, without any further intervention from the code itself, as shown in Figure 4.
Once the user authorizes the update, the device downloads and updates the code. This process happens without any more intervention from the user or the original MIDlet. Once the update has finished, the old MIDlet is removed from the device and the new one is installed. After the install, the device will confirm whether the user wants to start the new MIDlet.
Updated 5-Oct-2012: Originally published in October 2010, this post is still one of the most popular on WAP Review. Today I went through some old download directories and added over a dozen more old Opera Mini versions.
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