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MtpDatabase.javaAPI DocAndroid 5.1 API44043Thu Mar 12 22:22:30 GMT 2015android.mtp

MtpDatabase

public class MtpDatabase extends Object
{@hide}

Fields Summary
private static final String
TAG
private final android.content.Context
mContext
private final String
mPackageName
private final android.content.IContentProvider
mMediaProvider
private final String
mVolumeName
private final android.net.Uri
mObjectsUri
private final String
mMediaStoragePath
private final String[]
mSubDirectories
private String
mSubDirectoriesWhere
private String[]
mSubDirectoriesWhereArgs
private final HashMap
mStorageMap
private final HashMap
mPropertyGroupsByProperty
private final HashMap
mPropertyGroupsByFormat
private boolean
mDatabaseModified
private android.content.SharedPreferences
mDeviceProperties
private static final int
DEVICE_PROPERTIES_DATABASE_VERSION
private static final String[]
ID_PROJECTION
private static final String[]
PATH_PROJECTION
private static final String[]
FORMAT_PROJECTION
private static final String[]
PATH_FORMAT_PROJECTION
private static final String[]
OBJECT_INFO_PROJECTION
private static final String
ID_WHERE
private static final String
PATH_WHERE
private static final String
STORAGE_WHERE
private static final String
FORMAT_WHERE
private static final String
PARENT_WHERE
private static final String
STORAGE_FORMAT_WHERE
private static final String
STORAGE_PARENT_WHERE
private static final String
FORMAT_PARENT_WHERE
private static final String
STORAGE_FORMAT_PARENT_WHERE
private final android.media.MediaScanner
mMediaScanner
private MtpServer
mServer
private int
mBatteryLevel
private int
mBatteryScale
private android.content.BroadcastReceiver
mBatteryReceiver
static final int[]
FILE_PROPERTIES
static final int[]
AUDIO_PROPERTIES
static final int[]
VIDEO_PROPERTIES
static final int[]
IMAGE_PROPERTIES
private long
mNativeContext
Constructors Summary
public MtpDatabase(android.content.Context context, String volumeName, String storagePath, String[] subDirectories)


          
              
        native_setup();

        mContext = context;
        mPackageName = context.getPackageName();
        mMediaProvider = context.getContentResolver().acquireProvider("media");
        mVolumeName = volumeName;
        mMediaStoragePath = storagePath;
        mObjectsUri = Files.getMtpObjectsUri(volumeName);
        mMediaScanner = new MediaScanner(context);

        mSubDirectories = subDirectories;
        if (subDirectories != null) {
            // Compute "where" string for restricting queries to subdirectories
            StringBuilder builder = new StringBuilder();
            builder.append("(");
            int count = subDirectories.length;
            for (int i = 0; i < count; i++) {
                builder.append(Files.FileColumns.DATA + "=? OR "
                        + Files.FileColumns.DATA + " LIKE ?");
                if (i != count - 1) {
                    builder.append(" OR ");
                }
            }
            builder.append(")");
            mSubDirectoriesWhere = builder.toString();

            // Compute "where" arguments for restricting queries to subdirectories
            mSubDirectoriesWhereArgs = new String[count * 2];
            for (int i = 0, j = 0; i < count; i++) {
                String path = subDirectories[i];
                mSubDirectoriesWhereArgs[j++] = path;
                mSubDirectoriesWhereArgs[j++] = path + "/%";
            }
        }

        // Set locale to MediaScanner.
        Locale locale = context.getResources().getConfiguration().locale;
        if (locale != null) {
            String language = locale.getLanguage();
            String country = locale.getCountry();
            if (language != null) {
                if (country != null) {
                    mMediaScanner.setLocale(language + "_" + country);
                } else {
                    mMediaScanner.setLocale(language);
                }
            }
        }
        initDeviceProperties(context);
Methods Summary
public voidaddStorage(MtpStorage storage)

        mStorageMap.put(storage.getPath(), storage);
private intbeginSendObject(java.lang.String path, int format, int parent, int storageId, long size, long modified)

        // if the path is outside of the storage root, do not allow access
        if (!inStorageRoot(path)) {
            Log.e(TAG, "attempt to put file outside of storage area: " + path);
            return -1;
        }
        // if mSubDirectories is not null, do not allow copying files to any other locations
        if (!inStorageSubDirectory(path)) return -1;

        // make sure the object does not exist
        if (path != null) {
            Cursor c = null;
            try {
                c = mMediaProvider.query(mPackageName, mObjectsUri, ID_PROJECTION, PATH_WHERE,
                        new String[] { path }, null, null);
                if (c != null && c.getCount() > 0) {
                    Log.w(TAG, "file already exists in beginSendObject: " + path);
                    return -1;
                }
            } catch (RemoteException e) {
                Log.e(TAG, "RemoteException in beginSendObject", e);
            } finally {
                if (c != null) {
                    c.close();
                }
            }
        }

        mDatabaseModified = true;
        ContentValues values = new ContentValues();
        values.put(Files.FileColumns.DATA, path);
        values.put(Files.FileColumns.FORMAT, format);
        values.put(Files.FileColumns.PARENT, parent);
        values.put(Files.FileColumns.STORAGE_ID, storageId);
        values.put(Files.FileColumns.SIZE, size);
        values.put(Files.FileColumns.DATE_MODIFIED, modified);

        try {
            Uri uri = mMediaProvider.insert(mPackageName, mObjectsUri, values);
            if (uri != null) {
                return Integer.parseInt(uri.getPathSegments().get(2));
            } else {
                return -1;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in beginSendObject", e);
            return -1;
        }
private android.database.CursorcreateObjectQuery(int storageID, int format, int parent)

        String where;
        String[] whereArgs;

        if (storageID == 0xFFFFFFFF) {
            // query all stores
            if (format == 0) {
                // query all formats
                if (parent == 0) {
                    // query all objects
                    where = null;
                    whereArgs = null;
                } else {
                    if (parent == 0xFFFFFFFF) {
                        // all objects in root of store
                        parent = 0;
                    }
                    where = PARENT_WHERE;
                    whereArgs = new String[] { Integer.toString(parent) };
                }
            } else {
                // query specific format
                if (parent == 0) {
                    // query all objects
                    where = FORMAT_WHERE;
                    whereArgs = new String[] { Integer.toString(format) };
                } else {
                    if (parent == 0xFFFFFFFF) {
                        // all objects in root of store
                        parent = 0;
                    }
                    where = FORMAT_PARENT_WHERE;
                    whereArgs = new String[] { Integer.toString(format),
                                               Integer.toString(parent) };
                }
            }
        } else {
            // query specific store
            if (format == 0) {
                // query all formats
                if (parent == 0) {
                    // query all objects
                    where = STORAGE_WHERE;
                    whereArgs = new String[] { Integer.toString(storageID) };
                } else {
                    if (parent == 0xFFFFFFFF) {
                        // all objects in root of store
                        parent = 0;
                    }
                    where = STORAGE_PARENT_WHERE;
                    whereArgs = new String[] { Integer.toString(storageID),
                                               Integer.toString(parent) };
                }
            } else {
                // query specific format
                if (parent == 0) {
                    // query all objects
                    where = STORAGE_FORMAT_WHERE;
                    whereArgs = new String[] {  Integer.toString(storageID),
                                                Integer.toString(format) };
                } else {
                    if (parent == 0xFFFFFFFF) {
                        // all objects in root of store
                        parent = 0;
                    }
                    where = STORAGE_FORMAT_PARENT_WHERE;
                    whereArgs = new String[] { Integer.toString(storageID),
                                               Integer.toString(format),
                                               Integer.toString(parent) };
                }
            }
        }

        // if we are restricting queries to mSubDirectories, we need to add the restriction
        // onto our "where" arguments
        if (mSubDirectoriesWhere != null) {
            if (where == null) {
                where = mSubDirectoriesWhere;
                whereArgs = mSubDirectoriesWhereArgs;
            } else {
                where = where + " AND " + mSubDirectoriesWhere;

                // create new array to hold whereArgs and mSubDirectoriesWhereArgs
                String[] newWhereArgs =
                        new String[whereArgs.length + mSubDirectoriesWhereArgs.length];
                int i, j;
                for (i = 0; i < whereArgs.length; i++) {
                    newWhereArgs[i] = whereArgs[i];
                }
                for (j = 0; j < mSubDirectoriesWhereArgs.length; i++, j++) {
                    newWhereArgs[i] = mSubDirectoriesWhereArgs[j];
                }
                whereArgs = newWhereArgs;
            }
        }

        return mMediaProvider.query(mPackageName, mObjectsUri, ID_PROJECTION, where,
                whereArgs, null, null);
private intdeleteFile(int handle)

        mDatabaseModified = true;
        String path = null;
        int format = 0;

        Cursor c = null;
        try {
            c = mMediaProvider.query(mPackageName, mObjectsUri, PATH_FORMAT_PROJECTION,
                            ID_WHERE, new String[] {  Integer.toString(handle) }, null, null);
            if (c != null && c.moveToNext()) {
                // don't convert to media path here, since we will be matching
                // against paths in the database matching /data/media
                path = c.getString(1);
                format = c.getInt(2);
            } else {
                return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
            }

            if (path == null || format == 0) {
                return MtpConstants.RESPONSE_GENERAL_ERROR;
            }

            // do not allow deleting any of the special subdirectories
            if (isStorageSubDirectory(path)) {
                return MtpConstants.RESPONSE_OBJECT_WRITE_PROTECTED;
            }

            if (format == MtpConstants.FORMAT_ASSOCIATION) {
                // recursive case - delete all children first
                Uri uri = Files.getMtpObjectsUri(mVolumeName);
                int count = mMediaProvider.delete(mPackageName, uri,
                    // the 'like' makes it use the index, the 'lower()' makes it correct
                    // when the path contains sqlite wildcard characters
                    "_data LIKE ?1 AND lower(substr(_data,1,?2))=lower(?3)",
                    new String[] { path + "/%",Integer.toString(path.length() + 1), path + "/"});
            }

            Uri uri = Files.getMtpObjectsUri(mVolumeName, handle);
            if (mMediaProvider.delete(mPackageName, uri, null, null) > 0) {
                if (format != MtpConstants.FORMAT_ASSOCIATION
                        && path.toLowerCase(Locale.US).endsWith("/.nomedia")) {
                    try {
                        String parentPath = path.substring(0, path.lastIndexOf("/"));
                        mMediaProvider.call(mPackageName, MediaStore.UNHIDE_CALL, parentPath, null);
                    } catch (RemoteException e) {
                        Log.e(TAG, "failed to unhide/rescan for " + path);
                    }
                }
                return MtpConstants.RESPONSE_OK;
            } else {
                return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in deleteFile", e);
            return MtpConstants.RESPONSE_GENERAL_ERROR;
        } finally {
            if (c != null) {
                c.close();
            }
        }
private voidendSendObject(java.lang.String path, int handle, int format, boolean succeeded)

        if (succeeded) {
            // handle abstract playlists separately
            // they do not exist in the file system so don't use the media scanner here
            if (format == MtpConstants.FORMAT_ABSTRACT_AV_PLAYLIST) {
                // extract name from path
                String name = path;
                int lastSlash = name.lastIndexOf('/");
                if (lastSlash >= 0) {
                    name = name.substring(lastSlash + 1);
                }
                // strip trailing ".pla" from the name
                if (name.endsWith(".pla")) {
                    name = name.substring(0, name.length() - 4);
                }

                ContentValues values = new ContentValues(1);
                values.put(Audio.Playlists.DATA, path);
                values.put(Audio.Playlists.NAME, name);
                values.put(Files.FileColumns.FORMAT, format);
                values.put(Files.FileColumns.DATE_MODIFIED, System.currentTimeMillis() / 1000);
                values.put(MediaColumns.MEDIA_SCANNER_NEW_OBJECT_ID, handle);
                try {
                    Uri uri = mMediaProvider.insert(mPackageName,
                            Audio.Playlists.EXTERNAL_CONTENT_URI, values);
                } catch (RemoteException e) {
                    Log.e(TAG, "RemoteException in endSendObject", e);
                }
            } else {
                mMediaScanner.scanMtpFile(path, mVolumeName, handle, format);
            }
        } else {
            deleteFile(handle);
        }
protected voidfinalize()

        try {
            native_finalize();
        } finally {
            super.finalize();
        }
private intgetDeviceProperty(int property, long[] outIntValue, char[] outStringValue)

        switch (property) {
            case MtpConstants.DEVICE_PROPERTY_SYNCHRONIZATION_PARTNER:
            case MtpConstants.DEVICE_PROPERTY_DEVICE_FRIENDLY_NAME:
                // writable string properties kept in shared preferences
                String value = mDeviceProperties.getString(Integer.toString(property), "");
                int length = value.length();
                if (length > 255) {
                    length = 255;
                }
                value.getChars(0, length, outStringValue, 0);
                outStringValue[length] = 0;
                return MtpConstants.RESPONSE_OK;

            case MtpConstants.DEVICE_PROPERTY_IMAGE_SIZE:
                // use screen size as max image size
                Display display = ((WindowManager)mContext.getSystemService(
                        Context.WINDOW_SERVICE)).getDefaultDisplay();
                int width = display.getMaximumSizeDimension();
                int height = display.getMaximumSizeDimension();
                String imageSize = Integer.toString(width) + "x" +  Integer.toString(height);
                imageSize.getChars(0, imageSize.length(), outStringValue, 0);
                outStringValue[imageSize.length()] = 0;
                return MtpConstants.RESPONSE_OK;

            // DEVICE_PROPERTY_BATTERY_LEVEL is implemented in the JNI code

            default:
                return MtpConstants.RESPONSE_DEVICE_PROP_NOT_SUPPORTED;
        }
private intgetNumObjects(int storageID, int format, int parent)

        Cursor c = null;
        try {
            c = createObjectQuery(storageID, format, parent);
            if (c != null) {
                return c.getCount();
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getNumObjects", e);
        } finally {
            if (c != null) {
                c.close();
            }
        }
        return -1;
private intgetObjectFilePath(int handle, char[] outFilePath, long[] outFileLengthFormat)

        if (handle == 0) {
            // special case root directory
            mMediaStoragePath.getChars(0, mMediaStoragePath.length(), outFilePath, 0);
            outFilePath[mMediaStoragePath.length()] = 0;
            outFileLengthFormat[0] = 0;
            outFileLengthFormat[1] = MtpConstants.FORMAT_ASSOCIATION;
            return MtpConstants.RESPONSE_OK;
        }
        Cursor c = null;
        try {
            c = mMediaProvider.query(mPackageName, mObjectsUri, PATH_FORMAT_PROJECTION,
                            ID_WHERE, new String[] {  Integer.toString(handle) }, null, null);
            if (c != null && c.moveToNext()) {
                String path = c.getString(1);
                path.getChars(0, path.length(), outFilePath, 0);
                outFilePath[path.length()] = 0;
                // File transfers from device to host will likely fail if the size is incorrect.
                // So to be safe, use the actual file size here.
                outFileLengthFormat[0] = new File(path).length();
                outFileLengthFormat[1] = c.getLong(2);
                return MtpConstants.RESPONSE_OK;
            } else {
                return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getObjectFilePath", e);
            return MtpConstants.RESPONSE_GENERAL_ERROR;
        } finally {
            if (c != null) {
                c.close();
            }
        }
private intgetObjectFormat(int handle)

        Cursor c = null;
        try {
            c = mMediaProvider.query(mPackageName, mObjectsUri, FORMAT_PROJECTION,
                            ID_WHERE, new String[] {  Integer.toString(handle) }, null, null);
            if (c != null && c.moveToNext()) {
                return c.getInt(1);
            } else {
                return -1;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getObjectFilePath", e);
            return -1;
        } finally {
            if (c != null) {
                c.close();
            }
        }
private booleangetObjectInfo(int handle, int[] outStorageFormatParent, char[] outName, long[] outCreatedModified)

        Cursor c = null;
        try {
            c = mMediaProvider.query(mPackageName, mObjectsUri, OBJECT_INFO_PROJECTION,
                            ID_WHERE, new String[] {  Integer.toString(handle) }, null, null);
            if (c != null && c.moveToNext()) {
                outStorageFormatParent[0] = c.getInt(1);
                outStorageFormatParent[1] = c.getInt(2);
                outStorageFormatParent[2] = c.getInt(3);

                // extract name from path
                String path = c.getString(4);
                int lastSlash = path.lastIndexOf('/");
                int start = (lastSlash >= 0 ? lastSlash + 1 : 0);
                int end = path.length();
                if (end - start > 255) {
                    end = start + 255;
                }
                path.getChars(start, end, outName, 0);
                outName[end - start] = 0;

                outCreatedModified[0] = c.getLong(5);
                outCreatedModified[1] = c.getLong(6);
                // use modification date as creation date if date added is not set
                if (outCreatedModified[0] == 0) {
                    outCreatedModified[0] = outCreatedModified[1];
                }
                return true;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getObjectInfo", e);
        } finally {
            if (c != null) {
                c.close();
            }
        }
        return false;
private int[]getObjectList(int storageID, int format, int parent)

        Cursor c = null;
        try {
            c = createObjectQuery(storageID, format, parent);
            if (c == null) {
                return null;
            }
            int count = c.getCount();
            if (count > 0) {
                int[] result = new int[count];
                for (int i = 0; i < count; i++) {
                    c.moveToNext();
                    result[i] = c.getInt(0);
                }
                return result;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getObjectList", e);
        } finally {
            if (c != null) {
                c.close();
            }
        }
        return null;
private MtpPropertyListgetObjectPropertyList(long handle, int format, long property, int groupCode, int depth)

        // FIXME - implement group support
        if (groupCode != 0) {
            return new MtpPropertyList(0, MtpConstants.RESPONSE_SPECIFICATION_BY_GROUP_UNSUPPORTED);
        }

        MtpPropertyGroup propertyGroup;
        if (property == 0xFFFFFFFFL) {
            if (format == 0 && handle > 0) {
                // return properties based on the object's format
                format = getObjectFormat((int)handle);
            }
             propertyGroup = mPropertyGroupsByFormat.get(format);
             if (propertyGroup == null) {
                int[] propertyList = getSupportedObjectProperties(format);
                propertyGroup = new MtpPropertyGroup(this, mMediaProvider, mPackageName,
                        mVolumeName, propertyList);
                mPropertyGroupsByFormat.put(new Integer(format), propertyGroup);
            }
        } else {
              propertyGroup = mPropertyGroupsByProperty.get(property);
             if (propertyGroup == null) {
                int[] propertyList = new int[] { (int)property };
                propertyGroup = new MtpPropertyGroup(this, mMediaProvider, mPackageName,
                        mVolumeName, propertyList);
                mPropertyGroupsByProperty.put(new Integer((int)property), propertyGroup);
            }
        }

        return propertyGroup.getPropertyList((int)handle, format, depth);
private int[]getObjectReferences(int handle)

        Uri uri = Files.getMtpReferencesUri(mVolumeName, handle);
        Cursor c = null;
        try {
            c = mMediaProvider.query(mPackageName, uri, ID_PROJECTION, null, null, null, null);
            if (c == null) {
                return null;
            }
            int count = c.getCount();
            if (count > 0) {
                int[] result = new int[count];
                for (int i = 0; i < count; i++) {
                    c.moveToNext();
                    result[i] = c.getInt(0);
                }
                return result;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getObjectList", e);
        } finally {
            if (c != null) {
                c.close();
            }
        }
        return null;
private int[]getSupportedCaptureFormats()

        // no capture formats yet
        return null;
private int[]getSupportedDeviceProperties()

        return new int[] {
            MtpConstants.DEVICE_PROPERTY_SYNCHRONIZATION_PARTNER,
            MtpConstants.DEVICE_PROPERTY_DEVICE_FRIENDLY_NAME,
            MtpConstants.DEVICE_PROPERTY_IMAGE_SIZE,
            MtpConstants.DEVICE_PROPERTY_BATTERY_LEVEL,
        };
private int[]getSupportedObjectProperties(int format)


        
        switch (format) {
            case MtpConstants.FORMAT_MP3:
            case MtpConstants.FORMAT_WAV:
            case MtpConstants.FORMAT_WMA:
            case MtpConstants.FORMAT_OGG:
            case MtpConstants.FORMAT_AAC:
                return AUDIO_PROPERTIES;
            case MtpConstants.FORMAT_MPEG:
            case MtpConstants.FORMAT_3GP_CONTAINER:
            case MtpConstants.FORMAT_WMV:
                return VIDEO_PROPERTIES;
            case MtpConstants.FORMAT_EXIF_JPEG:
            case MtpConstants.FORMAT_GIF:
            case MtpConstants.FORMAT_PNG:
            case MtpConstants.FORMAT_BMP:
                return IMAGE_PROPERTIES;
            default:
                return FILE_PROPERTIES;
        }
private int[]getSupportedPlaybackFormats()

        return new int[] {
            // allow transfering arbitrary files
            MtpConstants.FORMAT_UNDEFINED,

            MtpConstants.FORMAT_ASSOCIATION,
            MtpConstants.FORMAT_TEXT,
            MtpConstants.FORMAT_HTML,
            MtpConstants.FORMAT_WAV,
            MtpConstants.FORMAT_MP3,
            MtpConstants.FORMAT_MPEG,
            MtpConstants.FORMAT_EXIF_JPEG,
            MtpConstants.FORMAT_TIFF_EP,
            MtpConstants.FORMAT_BMP,
            MtpConstants.FORMAT_GIF,
            MtpConstants.FORMAT_JFIF,
            MtpConstants.FORMAT_PNG,
            MtpConstants.FORMAT_TIFF,
            MtpConstants.FORMAT_WMA,
            MtpConstants.FORMAT_OGG,
            MtpConstants.FORMAT_AAC,
            MtpConstants.FORMAT_MP4_CONTAINER,
            MtpConstants.FORMAT_MP2,
            MtpConstants.FORMAT_3GP_CONTAINER,
            MtpConstants.FORMAT_ABSTRACT_AV_PLAYLIST,
            MtpConstants.FORMAT_WPL_PLAYLIST,
            MtpConstants.FORMAT_M3U_PLAYLIST,
            MtpConstants.FORMAT_PLS_PLAYLIST,
            MtpConstants.FORMAT_XML_DOCUMENT,
            MtpConstants.FORMAT_FLAC,
        };
private booleaninStorageRoot(java.lang.String path)

        try {
            File f = new File(path);
            String canonical = f.getCanonicalPath();
            for (String root: mStorageMap.keySet()) {
                if (canonical.startsWith(root)) {
                    return true;
                }
            }
        } catch (IOException e) {
            // ignore
        }
        return false;
private booleaninStorageSubDirectory(java.lang.String path)

        if (mSubDirectories == null) return true;
        if (path == null) return false;

        boolean allowed = false;
        int pathLength = path.length();
        for (int i = 0; i < mSubDirectories.length && !allowed; i++) {
            String subdir = mSubDirectories[i];
            int subdirLength = subdir.length();
            if (subdirLength < pathLength &&
                    path.charAt(subdirLength) == '/" &&
                    path.startsWith(subdir)) {
                allowed = true;
            }
        }
        return allowed;
private voidinitDeviceProperties(android.content.Context context)

        final String devicePropertiesName = "device-properties";
        mDeviceProperties = context.getSharedPreferences(devicePropertiesName, Context.MODE_PRIVATE);
        File databaseFile = context.getDatabasePath(devicePropertiesName);

        if (databaseFile.exists()) {
            // for backward compatibility - read device properties from sqlite database
            // and migrate them to shared prefs
            SQLiteDatabase db = null;
            Cursor c = null;
            try {
                db = context.openOrCreateDatabase("device-properties", Context.MODE_PRIVATE, null);
                if (db != null) {
                    c = db.query("properties", new String[] { "_id", "code", "value" },
                            null, null, null, null, null);
                    if (c != null) {
                        SharedPreferences.Editor e = mDeviceProperties.edit();
                        while (c.moveToNext()) {
                            String name = c.getString(1);
                            String value = c.getString(2);
                            e.putString(name, value);
                        }
                        e.commit();
                    }
                }
            } catch (Exception e) {
                Log.e(TAG, "failed to migrate device properties", e);
            } finally {
                if (c != null) c.close();
                if (db != null) db.close();
            }
            context.deleteDatabase(devicePropertiesName);
        }
private booleanisStorageSubDirectory(java.lang.String path)

    if (mSubDirectories == null) return false;
        for (int i = 0; i < mSubDirectories.length; i++) {
            if (path.equals(mSubDirectories[i])) {
                return true;
            }
        }
        return false;
private final native voidnative_finalize()

private final native voidnative_setup()
public voidremoveStorage(MtpStorage storage)
        mStorageMap.remove(storage.getPath());
    
private intrenameFile(int handle, java.lang.String newName)
        Cursor c = null;

        // first compute current path
        String path = null;
        String[] whereArgs = new String[] {  Integer.toString(handle) };
        try {
            c = mMediaProvider.query(mPackageName, mObjectsUri, PATH_PROJECTION, ID_WHERE,
                    whereArgs, null, null);
            if (c != null && c.moveToNext()) {
                path = c.getString(1);
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in getObjectFilePath", e);
            return MtpConstants.RESPONSE_GENERAL_ERROR;
        } finally {
            if (c != null) {
                c.close();
            }
        }
        if (path == null) {
            return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
        }

        // do not allow renaming any of the special subdirectories
        if (isStorageSubDirectory(path)) {
            return MtpConstants.RESPONSE_OBJECT_WRITE_PROTECTED;
        }

        // now rename the file.  make sure this succeeds before updating database
        File oldFile = new File(path);
        int lastSlash = path.lastIndexOf('/");
        if (lastSlash <= 1) {
            return MtpConstants.RESPONSE_GENERAL_ERROR;
        }
        String newPath = path.substring(0, lastSlash + 1) + newName;
        File newFile = new File(newPath);
        boolean success = oldFile.renameTo(newFile);
        if (!success) {
            Log.w(TAG, "renaming "+ path + " to " + newPath + " failed");
            return MtpConstants.RESPONSE_GENERAL_ERROR;
        }

        // finally update database
        ContentValues values = new ContentValues();
        values.put(Files.FileColumns.DATA, newPath);
        int updated = 0;
        try {
            // note - we are relying on a special case in MediaProvider.update() to update
            // the paths for all children in the case where this is a directory.
            updated = mMediaProvider.update(mPackageName, mObjectsUri, values, ID_WHERE, whereArgs);
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in mMediaProvider.update", e);
        }
        if (updated == 0) {
            Log.e(TAG, "Unable to update path for " + path + " to " + newPath);
            // this shouldn't happen, but if it does we need to rename the file to its original name
            newFile.renameTo(oldFile);
            return MtpConstants.RESPONSE_GENERAL_ERROR;
        }

        // check if nomedia status changed
        if (newFile.isDirectory()) {
            // for directories, check if renamed from something hidden to something non-hidden
            if (oldFile.getName().startsWith(".") && !newPath.startsWith(".")) {
                // directory was unhidden
                try {
                    mMediaProvider.call(mPackageName, MediaStore.UNHIDE_CALL, newPath, null);
                } catch (RemoteException e) {
                    Log.e(TAG, "failed to unhide/rescan for " + newPath);
                }
            }
        } else {
            // for files, check if renamed from .nomedia to something else
            if (oldFile.getName().toLowerCase(Locale.US).equals(".nomedia")
                    && !newPath.toLowerCase(Locale.US).equals(".nomedia")) {
                try {
                    mMediaProvider.call(mPackageName, MediaStore.UNHIDE_CALL, oldFile.getParent(), null);
                } catch (RemoteException e) {
                    Log.e(TAG, "failed to unhide/rescan for " + newPath);
                }
            }
        }

        return MtpConstants.RESPONSE_OK;
    
private voidsessionEnded()
        if (mDatabaseModified) {
            mContext.sendBroadcast(new Intent(MediaStore.ACTION_MTP_SESSION_END));
            mDatabaseModified = false;
        }
    
private voidsessionStarted()
        mDatabaseModified = false;
    
private intsetDeviceProperty(int property, long intValue, java.lang.String stringValue)
        switch (property) {
            case MtpConstants.DEVICE_PROPERTY_SYNCHRONIZATION_PARTNER:
            case MtpConstants.DEVICE_PROPERTY_DEVICE_FRIENDLY_NAME:
                // writable string properties kept in shared prefs
                SharedPreferences.Editor e = mDeviceProperties.edit();
                e.putString(Integer.toString(property), stringValue);
                return (e.commit() ? MtpConstants.RESPONSE_OK
                        : MtpConstants.RESPONSE_GENERAL_ERROR);
        }

        return MtpConstants.RESPONSE_DEVICE_PROP_NOT_SUPPORTED;
    
private intsetObjectProperty(int handle, int property, long intValue, java.lang.String stringValue)
        switch (property) {
            case MtpConstants.PROPERTY_OBJECT_FILE_NAME:
                return renameFile(handle, stringValue);

            default:
                return MtpConstants.RESPONSE_OBJECT_PROP_NOT_SUPPORTED;
        }
    
private intsetObjectReferences(int handle, int[] references)
        mDatabaseModified = true;
        Uri uri = Files.getMtpReferencesUri(mVolumeName, handle);
        int count = references.length;
        ContentValues[] valuesList = new ContentValues[count];
        for (int i = 0; i < count; i++) {
            ContentValues values = new ContentValues();
            values.put(Files.FileColumns._ID, references[i]);
            valuesList[i] = values;
        }
        try {
            if (mMediaProvider.bulkInsert(mPackageName, uri, valuesList) > 0) {
                return MtpConstants.RESPONSE_OK;
            }
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in setObjectReferences", e);
        }
        return MtpConstants.RESPONSE_GENERAL_ERROR;
    
public voidsetServer(MtpServer server)
        mServer = server;

        // always unregister before registering
        try {
            mContext.unregisterReceiver(mBatteryReceiver);
        } catch (IllegalArgumentException e) {
            // wasn't previously registered, ignore
        }

        // register for battery notifications when we are connected
        if (server != null) {
            mContext.registerReceiver(mBatteryReceiver,
                    new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        }