下面列出了android.content.res.AssetFileDescriptor#getDeclaredLength() 实例代码,或者点击链接到github查看源代码,也可以在右侧发表评论。
public static FileInfo getContactAsVCardFile(Context context, Uri uri) {
AssetFileDescriptor fd;
try {
fd = context.getContentResolver().openAssetFileDescriptor(uri, "r");
java.io.FileInputStream in = fd.createInputStream();
byte[] buf = new byte[(int) fd.getDeclaredLength()];
in.read(buf);
in.close();
String vCardText = new String(buf);
Log.d("Vcard", vCardText);
List<String> pathSegments = uri.getPathSegments();
String targetPath = "/" + pathSegments.get(pathSegments.size() - 1) + ".vcf";
SecureMediaStore.copyToVfs(buf, targetPath);
FileInfo info = new FileInfo();
info.stream = new info.guardianproject.iocipher.FileInputStream(SecureMediaStore.vfsUri(targetPath).getPath());
info.type = "text/vcard";
return info;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private byte[] loadBytes() {
try {
AssetFileDescriptor assetFileDescriptor = getAssets().openFd("lite_template/card.wasm");
long len = assetFileDescriptor.getDeclaredLength();
ByteBuffer buf = ByteBuffer.allocate((int) len);
InputStream json = assetFileDescriptor.createInputStream();
json.read(buf.array());
json.close();
return buf.array();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 加载模型文件
* @param assetManager
* @param modelPath
* @return
* @throws IOException
*/
public static MappedByteBuffer loadModelFile(AssetManager assetManager, String modelPath) throws IOException {
AssetFileDescriptor fileDescriptor = assetManager.openFd(modelPath);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
protected MappedByteBuffer loadModelFile(AssetManager assetManager, String modelPath) throws IOException {
AssetFileDescriptor fileDescriptor = assetManager.openFd(modelPath);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/** Memory-map the model file in Assets. */
public MappedByteBuffer loadModelFile() throws IOException {
AssetFileDescriptor fileDescriptor = ASSET_MANAGER.openFd(MODEL_PATH);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/**
* Memory-map the model file in Assets.
*/
private static MappedByteBuffer loadModelFile(AssetManager assets, String modelFilename)
throws IOException {
AssetFileDescriptor fileDescriptor = assets.openFd(modelFilename);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/** Memory-map the model file in Assets. */
private static MappedByteBuffer loadModelFile(AssetManager assets, String modelFilename)
throws IOException {
AssetFileDescriptor fileDescriptor = assets.openFd(modelFilename);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
private static MappedByteBuffer loadModelFile(Context context, String modelFile) {
if (context == null
|| TextUtils.isEmpty(modelFile)) {
return null;
}
MappedByteBuffer buffer = null;
try {
AssetFileDescriptor df = context.getAssets().openFd(modelFile);
FileInputStream inputStream = new FileInputStream(df.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = df.getStartOffset();
long declaredLength = df.getDeclaredLength();
buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
} catch (IOException e) {
Logger.debug("load tflite model from [%s] failed: %s",
modelFile,
e.toString());
buffer = null;
}
return buffer;
}
/** Memory-map the model file in Assets. */
private MappedByteBuffer loadModelFile(Activity activity) throws IOException {
AssetFileDescriptor fileDescriptor = activity.getAssets().openFd(getModelPath());
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/** Memory-map the model file in Assets. */
private MappedByteBuffer loadModelFile(Activity activity) throws IOException {
AssetFileDescriptor fileDescriptor = activity.getAssets().openFd(MODEL_PATH);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/** Memory-map the model file in Assets. */
private static MappedByteBuffer loadModelFile(AssetManager assets, String modelFilename)
throws IOException {
AssetFileDescriptor fileDescriptor = assets.openFd(modelFilename);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
private MappedByteBuffer loadModelFile(AssetManager assetManager, String modelPath) throws IOException {
AssetFileDescriptor fileDescriptor = assetManager.openFd(modelPath);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/**
* Memory-map the model file in Assets.
*/
public static MappedByteBuffer loadModelFile(Context context, String modelFile)
throws IOException {
AssetFileDescriptor fileDescriptor = context.getAssets().openFd(modelFile);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
private void setDataSourceInternalContentUri(Context context, Uri uri)
throws IOException, IllegalArgumentException, SecurityException, IllegalStateException {
final ContentResolver cr = context.getContentResolver();
AssetFileDescriptor afd = cr.openAssetFileDescriptor(uri, "r");
FileDescriptor fd = afd.getFileDescriptor();
final int nativeFD;
try {
nativeFD = checkAndObtainNativeFileDescriptor(fd);
} catch (IllegalArgumentException e) {
closeQuietly(afd);
throw e;
}
final int result;
final long declLength = afd.getDeclaredLength();
final long startOffset = afd.getStartOffset();
if (declLength < 0) {
result = setDataSourceFdImplNative(mNativeHandle, nativeFD);
} else {
result = setDataSourceFdImplNative(
mNativeHandle, nativeFD, startOffset, declLength);
}
parseResultAndThrowException(result);
mContentAssetFd = afd;
}
/**
* Memory-map the model file in Assets.
*/
public static MappedByteBuffer loadModelFile(Context context, String modelFile)
throws IOException {
AssetFileDescriptor fileDescriptor = context.getAssets().openFd(modelFile);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/**
* Memory-map the model file in Assets.
*/
public static MappedByteBuffer loadModelFile(Context context, String modelFile)
throws IOException {
AssetFileDescriptor fileDescriptor = context.getAssets().openFd(modelFile);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
protected MappedByteBuffer loadMappedFile(String filePath) throws IOException {
AssetFileDescriptor fileDescriptor = assetManager.openFd(this.directoryName + "/" + filePath);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(MapMode.READ_ONLY, startOffset, declaredLength);
}
/** Memory-map the model file in Assets. */
private static MappedByteBuffer loadModelFile(AssetManager assets, String modelFilename)
throws IOException {
AssetFileDescriptor fileDescriptor = assets.openFd(modelFilename);
FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = fileDescriptor.getStartOffset();
long declaredLength = fileDescriptor.getDeclaredLength();
return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
/**
* Open a raw file descriptor to access data under a URI. This
* is like {@link #openAssetFileDescriptor(Uri, String)}, but uses the
* underlying {@link ContentProvider#openFile}
* ContentProvider.openFile()} method, so will <em>not</em> work with
* providers that return sub-sections of files. If at all possible,
* you should use {@link #openAssetFileDescriptor(Uri, String)}. You
* will receive a FileNotFoundException exception if the provider returns a
* sub-section of a file.
*
* <h5>Accepts the following URI schemes:</h5>
* <ul>
* <li>content ({@link #SCHEME_CONTENT})</li>
* <li>file ({@link #SCHEME_FILE})</li>
* </ul>
*
* <p>See {@link #openAssetFileDescriptor(Uri, String)} for more information
* on these schemes.
* <p>
* If opening with the exclusive "r" or "w" modes, the returned
* ParcelFileDescriptor could be a pipe or socket pair to enable streaming
* of data. Opening with the "rw" mode implies a file on disk that supports
* seeking. If possible, always use an exclusive mode to give the underlying
* {@link ContentProvider} the most flexibility.
* <p>
* If you are writing a file, and need to communicate an error to the
* provider, use {@link ParcelFileDescriptor#closeWithError(String)}.
*
* @param uri The desired URI to open.
* @param mode The file mode to use, as per {@link ContentProvider#openFile
* ContentProvider.openFile}.
* @param cancellationSignal A signal to cancel the operation in progress,
* or null if none. If the operation is canceled, then
* {@link OperationCanceledException} will be thrown.
* @return Returns a new ParcelFileDescriptor pointing to the file. You
* own this descriptor and are responsible for closing it when done.
* @throws FileNotFoundException Throws FileNotFoundException if no
* file exists under the URI or the mode is invalid.
* @see #openAssetFileDescriptor(Uri, String)
*/
public final @Nullable ParcelFileDescriptor openFileDescriptor(@NonNull Uri uri,
@NonNull String mode, @Nullable CancellationSignal cancellationSignal)
throws FileNotFoundException {
AssetFileDescriptor afd = openAssetFileDescriptor(uri, mode, cancellationSignal);
if (afd == null) {
return null;
}
if (afd.getDeclaredLength() < 0) {
// This is a full file!
return afd.getParcelFileDescriptor();
}
// Client can't handle a sub-section of a file, so close what
// we got and bail with an exception.
try {
afd.close();
} catch (IOException e) {
}
throw new FileNotFoundException("Not a whole file");
}
/**
* Open a raw file descriptor to access data under a URI. This
* is like {@link #openAssetFileDescriptor(Uri, String)}, but uses the
* underlying {@link ContentProvider#openFile}
* ContentProvider.openFile()} method, so will <em>not</em> work with
* providers that return sub-sections of files. If at all possible,
* you should use {@link #openAssetFileDescriptor(Uri, String)}. You
* will receive a FileNotFoundException exception if the provider returns a
* sub-section of a file.
*
* <h5>Accepts the following URI schemes:</h5>
* <ul>
* <li>content ({@link #SCHEME_CONTENT})</li>
* <li>file ({@link #SCHEME_FILE})</li>
* </ul>
*
* <p>See {@link #openAssetFileDescriptor(Uri, String)} for more information
* on these schemes.
* <p>
* If opening with the exclusive "r" or "w" modes, the returned
* ParcelFileDescriptor could be a pipe or socket pair to enable streaming
* of data. Opening with the "rw" mode implies a file on disk that supports
* seeking. If possible, always use an exclusive mode to give the underlying
* {@link ContentProvider} the most flexibility.
* <p>
* If you are writing a file, and need to communicate an error to the
* provider, use {@link ParcelFileDescriptor#closeWithError(String)}.
*
* @param uri The desired URI to open.
* @param mode The file mode to use, as per {@link ContentProvider#openFile
* ContentProvider.openFile}.
* @param cancellationSignal A signal to cancel the operation in progress,
* or null if none. If the operation is canceled, then
* {@link OperationCanceledException} will be thrown.
* @return Returns a new ParcelFileDescriptor pointing to the file. You
* own this descriptor and are responsible for closing it when done.
* @throws FileNotFoundException Throws FileNotFoundException if no
* file exists under the URI or the mode is invalid.
* @see #openAssetFileDescriptor(Uri, String)
*/
public final @Nullable ParcelFileDescriptor openFileDescriptor(@NonNull Uri uri,
@NonNull String mode, @Nullable CancellationSignal cancellationSignal)
throws FileNotFoundException {
AssetFileDescriptor afd = openAssetFileDescriptor(uri, mode, cancellationSignal);
if (afd == null) {
return null;
}
if (afd.getDeclaredLength() < 0) {
// This is a full file!
return afd.getParcelFileDescriptor();
}
// Client can't handle a sub-section of a file, so close what
// we got and bail with an exception.
try {
afd.close();
} catch (IOException e) {
}
throw new FileNotFoundException("Not a whole file");
}