To use, add the following to your AndroidManifest.xml: * * * * */ public class AssetProvider extends ContentProvider { AssetManager mAssets; @Override public boolean onCreate() { Context ctx = getContext(); if (ctx == null) { // Context not available. Give up. return false; } mAssets = ctx.getAssets(); return true; } @Override public String getType(Uri uri){ // Returns the MIME type for the selected URI, in conformance with the ContentProvider // interface. Looks up the file indicated by /res/assets/{uri.path}, and returns the MIME // type for that file as guessed by the URLConnection class. // Setup String path = uri.getPath(); // Check if file exists if (!fileExists(path)) { return null; } // Determine MIME-type based on filename return guessContentTypeFromName(uri.toString()); } @Override public AssetFileDescriptor openAssetFile (Uri uri, String mode) throws FileNotFoundException, SecurityException { // ContentProvider interface for opening a file descriptor by URI. This content provider // maps all URIs to the contents of the APK's assets folder, so a file handle to // /res/assets/{uri.path} will be returned. // Security check. This content provider only supports read-only access. (Also, the contents // of an APKs assets folder are immutable, so read-write access doesn't make sense here.) if (!"r".equals(mode)) { throw new SecurityException("Only read-only access is supported, mode must be [r]"); } // Open asset from within APK and return file descriptor String path = uri.getPath(); try { return mAssets.openFd(path); } catch (IOException e) { throw new FileNotFoundException(); } } /** * Check if file exists inside APK assets. * * @param path Fully qualified path to file. * @return true if exists, false otherwise. */ private boolean fileExists(String path) { try { // Check to see if file can be opened. If so, file exists. mAssets.openFd(path).close(); return true; } catch (IOException e) { // Unable to open file descriptor for specified path; file doesn't exist. return false; } } // Required/unused ContentProvider methods below. @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { // Note: It might be worth implementing support for querying // android.provider.OpenableColumns here in the future. throw new RuntimeException("Operation not supported"); } @Override public Uri insert(Uri uri, ContentValues contentValues) { throw new RuntimeException("Operation not supported"); } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { throw new RuntimeException("Operation not supported"); } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { throw new RuntimeException("Operation not supported"); } }
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