public RawImage requestOrLoadImage(String filename) throws IOException {
File imageFile = new File(filename);
String canonicalPath = imageFile.getCanonicalPath();
if (registry.containsKey(canonicalPath)) {
return registry.get(canonicalPath);
} else {
RawImage newImage = imageLoader.createImageFromFile(filename);
registry.put(canonicalPath, newImage);
loadingStates.put(newImage, LoadingState.NotLoadedYet);
return newImage;
}
}
/**
* Starts the image loading process if it has not been started yet. If ther loading process is in
* progress, adds the caller's reporter its reporters list. If the image is loaded successfully,
* just calls reporter's <code>reportSuccess</code> with the bitmap.
*
* @param activity caller activity
* @param filename name of the image to be loaded
* @param reporter caller's reporter object
* @return The current loading progress status
* @throws IOException
*/
public synchronized LoadingState loadImage(
final RawImage img, final ImageLoaderReporter reporter) {
// Checking if the image needs loading
if (loadingStates.get(img) == LoadingState.NotLoadedYet
|| loadingStates.get(img) == LoadingState.LoadingError) {
// Creating the progress listener
final ProgressListener imageLoadingProgressListener =
new ProgressListener() {
@Override
public boolean reportProgress(float progress) {
int p = (int) (progress * 100);
reporters.callReportProgressForImage(img, p);
return true;
}
};
// Adding the new listener to the loader
imageLoader.addProgressListener(imageLoadingProgressListener);
// Adding the image loading reporter
reporters.add(img, reporter);
// Creating a runnable which will load the image for us
Runnable imageLoadingRunnable =
new Runnable() {
ImageLoaderException exception = null;
@Override
public void run() {
// At start...
// Showing the progress dialog (reporting the 0% progress)
reporters.callReportProgressForImage(img, 0);
// Setting the image's loading state
loadingStates.put(img, LoadingState.LoadingInProgress);
// Loading the bitmap itself
IPreciseBitmap pb = null;
try {
pb = img.getBitmap();
} catch (ImageLoaderException e) {
// Saving the exception
exception = e;
}
// At final...
final IPreciseBitmap result = pb;
final ImageLoaderException resultException = exception;
// Removing the progress handler
imageLoader.removeProgressListener(imageLoadingProgressListener);
// Checking if exception has occured
if (resultException != null) {
// Setting the image's loading state
loadingStates.put(img, LoadingState.LoadingError);
// Reporting exception to the caller
reporters.callReportExceptionForImage(img, resultException);
} else {
// Setting the image's loading state
loadingStates.put(img, LoadingState.Loaded);
// Adding the result to the registry
loadedBitmaps.put(img, result);
// Reporting the result to the caller
reporters.callReportSuccessForImage(img, result);
}
}
};
// Running the loader thread
new Thread(imageLoadingRunnable).start();
} else if (loadingStates.get(img) == LoadingState.LoadingInProgress) {
// Adding the image loading reporter
// (after the image has loaded by other, already started thread,
// the result will be sent to the caller)
reporters.add(img, reporter);
} else if (loadingStates.get(img) == LoadingState.Loaded) {
// If the image is loaded, its bitmap should be in the registry.
// So we retrieve it from there and sending to caller.
reporter.reportSuccess(loadedBitmaps.get(img));
}
// Returning the current loading state
return loadingStates.get(img);
}