Example usage for android.content.res AssetFileDescriptor AssetFileDescriptor

Introduction

In this page you can find the example usage for android.content.res AssetFileDescriptor AssetFileDescriptor.

Prototype

public AssetFileDescriptor(ParcelFileDescriptor fd, long startOffset, long length) 

Source Link

Document

Create a new AssetFileDescriptor from the given values.

Usage

From source file:com.raspi.chatapp.util.storage.file.LocalStorageProvider.java

@Override
public AssetFileDescriptor openDocumentThumbnail(final String documentId, final Point sizeHint,
        final CancellationSignal signal) throws FileNotFoundException {
    if (LocalStorageProvider.isMissingPermission(getContext())) {
        return null;
    }/*www .j av a  2  s.  co m*/
    // Assume documentId points to an image file. Build a thumbnail no larger than twice the sizeHint
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(documentId, options);
    final int targetHeight = 2 * sizeHint.y;
    final int targetWidth = 2 * sizeHint.x;
    final int height = options.outHeight;
    final int width = options.outWidth;
    options.inSampleSize = 1;
    if (height > targetHeight || width > targetWidth) {
        final int halfHeight = height / 2;
        final int halfWidth = width / 2;
        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / options.inSampleSize) > targetHeight
                || (halfWidth / options.inSampleSize) > targetWidth) {
            options.inSampleSize *= 2;
        }
    }
    options.inJustDecodeBounds = false;
    Bitmap bitmap = BitmapFactory.decodeFile(documentId, options);
    // Write out the thumbnail to a temporary file
    File tempFile = null;
    FileOutputStream out = null;
    try {
        tempFile = File.createTempFile("thumbnail", null, getContext().getCacheDir());
        out = new FileOutputStream(tempFile);
        bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
    } catch (IOException e) {
        Log.e(LocalStorageProvider.class.getSimpleName(), "Error writing thumbnail", e);
        return null;
    } finally {
        if (out != null)
            try {
                out.close();
            } catch (IOException e) {
                Log.e(LocalStorageProvider.class.getSimpleName(), "Error closing thumbnail", e);
            }
    }
    // It appears the Storage Framework UI caches these results quite aggressively so there is little reason to
    // write your own caching layer beyond what you need to return a single AssetFileDescriptor
    return new AssetFileDescriptor(ParcelFileDescriptor.open(tempFile, ParcelFileDescriptor.MODE_READ_ONLY), 0,
            AssetFileDescriptor.UNKNOWN_LENGTH);
}

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From source file:com.seafile.seadroid2.provider.SeafileProvider.java

@Override
public AssetFileDescriptor openDocumentThumbnail(String documentId, Point sizeHint, CancellationSignal signal)
        throws FileNotFoundException {

    Log.d(DEBUG_TAG, "openDocumentThumbnail(): " + documentId);

    String repoId = DocumentIdParser.getRepoIdFromId(documentId);
    if (repoId.isEmpty()) {
        throw new FileNotFoundException();
    }//from   w  w  w .j av a2s  . co  m

    String mimeType = Utils.getFileMimeType(documentId);
    if (!mimeType.startsWith("image/")) {
        throw new FileNotFoundException();
    }

    DataManager dm = createDataManager(documentId);

    String path = DocumentIdParser.getPathFromId(documentId);

    final DisplayImageOptions options = new DisplayImageOptions.Builder().extraForDownloader(dm.getAccount())
            .cacheInMemory(false) // SAF does its own caching
            .cacheOnDisk(true).considerExifParams(true).build();

    final ParcelFileDescriptor[] pair;
    try {
        pair = ParcelFileDescriptor.createReliablePipe();
    } catch (IOException e) {
        throw new FileNotFoundException();
    }

    final String url = dm.getThumbnailLink(repoId, path, sizeHint.x);
    if (url == null)
        throw new FileNotFoundException();

    // do thumbnail download in another thread to avoid possible network access in UI thread
    final Future future = ConcurrentAsyncTask.submit(new Runnable() {

        @Override
        public void run() {
            try {
                FileOutputStream fileStream = new FileOutputStream(pair[1].getFileDescriptor());

                // load the file. this might involve talking to the seafile server. this will hang until
                // it is done.
                Bitmap bmp = ImageLoader.getInstance().loadImageSync(url, options);

                if (bmp != null) {
                    bmp.compress(Bitmap.CompressFormat.PNG, 100, fileStream);
                }
            } finally {
                IOUtils.closeQuietly(pair[1]);
            }
        }
    });

    if (signal != null) {
        signal.setOnCancelListener(new CancellationSignal.OnCancelListener() {
            @Override
            public void onCancel() {
                Log.d(DEBUG_TAG, "openDocumentThumbnail() cancelling download");
                future.cancel(true);
                IOUtils.closeQuietly(pair[1]);
            }
        });
    }

    return new AssetFileDescriptor(pair[0], 0, AssetFileDescriptor.UNKNOWN_LENGTH);
}

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From source file:org.alfresco.mobile.android.application.providers.storage.StorageAccessDocumentsProvider.java

@Override
public AssetFileDescriptor openDocumentThumbnail(String documentId, Point sizeHint, CancellationSignal signal)
        throws FileNotFoundException {
    // Log.v(TAG, "openDocumentThumbnail");
    try {/*  w  w  w.  ja  v a2 s  .c  om*/
        Node currentNode = null;
        EncodedQueryUri cUri = new EncodedQueryUri(documentId);
        if (cUri.type != PREFIX_DOC) {
            return null;
        }
        checkSession(cUri);

        currentNode = retrieveNode(cUri.id);

        // Let's retrieve the thumbnail
        // Store the document inside a temporary folder per account
        File downloadedFile = null;
        if (getContext() != null && currentNode != null && session != null) {
            File folder = AlfrescoStorageManager.getInstance(getContext()).getTempFolder(selectedAccount);
            if (folder != null) {
                downloadedFile = new File(folder, currentNode.getName());
            }
        } else {
            return null;
        }

        // Is Document in cache ?
        if (downloadedFile.exists()
                && currentNode.getModifiedAt().getTimeInMillis() < downloadedFile.lastModified()) {
            // Document available locally
            ParcelFileDescriptor pfd = ParcelFileDescriptor.open(downloadedFile,
                    ParcelFileDescriptor.MODE_READ_ONLY);
            return new AssetFileDescriptor(pfd, 0, downloadedFile.length());
        }

        // Not in cache so let's download the content !
        ContentStream contentStream = session.getServiceRegistry().getDocumentFolderService()
                .getRenditionStream(currentNode, DocumentFolderService.RENDITION_THUMBNAIL);

        // Check ContentStream
        if (contentStream == null || contentStream.getLength() == 0) {
            return null;
        }

        // Store the thumbnail locally
        copyFile(contentStream.getInputStream(), contentStream.getLength(), downloadedFile, signal);

        // Return the fileDescriptor
        if (downloadedFile.exists()) {
            ParcelFileDescriptor pfd = ParcelFileDescriptor.open(downloadedFile,
                    ParcelFileDescriptor.MODE_READ_ONLY);
            return new AssetFileDescriptor(pfd, 0, downloadedFile.length());
        } else {
            return null;
        }
    } catch (Exception e) {
        Log.w(TAG, Log.getStackTraceString(e));
        return null;
    }
}

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From source file:net.sf.xfd.provider.PublicProvider.java

@Nullable
@Override//from  w w w.j av  a2 s . c om
public AssetFileDescriptor openAssetFile(@NonNull Uri uri, @NonNull String mode,
        @Nullable CancellationSignal signal) throws FileNotFoundException {
    ParcelFileDescriptor fd = openFile(uri, mode, signal);

    return fd != null ? new AssetFileDescriptor(fd, 0, -1) : null;
}

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