Replace file pre-loaded

Can I preload a file in my application. Deploy the application in a device and then dynamically, replace it once the application is running, i.e. to open the file and edit some content or files preloaded are read only?

If I can open it and replace some content, then how can specify the path of a file named as below:

private static String _xmlFileName = "/ content / content.xml ';

One way is like that. Suppose that you decide to use the store for the replaceable image. Startup of the application (or the image recovery whenever it is necessary) works as follows (details left as an exercise ):

Bitmap getImage(String imageID) {   byte[] imageData = readImageDataFromStore(imageID);
  if (imageData == null) {
    imageData = copyImageResourceToStore(imageID);
  }
  image = Bitmap.createBitmapFromPng(imageData, 0, -1);}

byte[] readImageDataFromStore(String id) {  // look for image data in persistent store  // return null if not found, else read fully and return as byte array}

void writeImageDataToStore(String id, byte[] data) {  //  write the given data to store where it can be retrieved by id}

String getResourceNameForID(String id) {  // look up the name of the resource file for the given id  // so, for instance, it might map "leftIconImg" to "images/bottom/ts_nav_center.png"} 

byte[] copyImageResourceToStore(String id) {  InputStream is = getClass().getResourceAsStream(getResourceNameForID(id));  ByteArrayOutputStream bos = new ByteArrayOutputStream();  byte[] buff = new byte[1000];  int len;   while ((len = is.read(buff)) > 0) {    bos.write(buff, 0, len);   }  is.close();  byte[] bytes = os.toByteArray();   writeImageDataToStore(String id, bytes);  return bytes; }

When you decide to replace the image with something else, just replace the data in the persistent store. In this way, the image resource that comes with the application is never used as long as there is an image in the persistent store.

Tags: BlackBerry Developers

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