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MtpDevice


android.mtp

Class MtpDevice



  • public final class MtpDevice
    extends Object
    This class represents an MTP or PTP device connected on the USB host bus. An application can instantiate an object of this type, by referencing an attached UsbDevice and then use methods in this class to get information about the device and objects stored on it, as well as open the connection and transfer data.
    • Constructor Detail

      • MtpDevice

        public MtpDevice(UsbDevice device)
        MtpClient constructor
        Parameters:
        device - the UsbDevice for the MTP or PTP device
    • Method Detail

      • open

        public boolean open(UsbDeviceConnection connection)
        Opens the MTP device. Once the device is open it takes ownership of the UsbDeviceConnection. The connection will be closed when you call close() The connection will also be closed if this method fails.
        Parameters:
        connection - an open UsbDeviceConnection for the device
        Returns:
        true if the device was successfully opened.
      • finalize

        protected void finalize()
                         throws Throwable
        Description copied from class: Object
        Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.

        Note that objects that override finalize are significantly more expensive than objects that don't. Finalizers may be run a long time after the object is no longer reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup. Note also that finalizers are run on a single VM-wide finalizer thread, so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary for a class that has a native peer and needs to call a native method to destroy that peer. Even then, it's better to provide an explicit close method (and implement Closeable), and insist that callers manually dispose of instances. This works well for something like files, but less well for something like a BigInteger where typical calling code would have to deal with lots of temporaries. Unfortunately, code that creates lots of temporaries is the worst kind of code from the point of view of the single finalizer thread.

        If you must use finalizers, consider at least providing your own ReferenceQueue and having your own thread process that queue.

        Unlike constructors, finalizers are not automatically chained. You are responsible for calling super.finalize() yourself.

        Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.

        Overrides:
        finalize in class Object
        Throws:
        Throwable
      • getDeviceId

        public int getDeviceId()
        Returns the USB ID of the USB device. This returns the same value as UsbDevice.getDeviceId() for the device's UsbDevice
        Returns:
        the device ID
      • toString

        public String toString()
        Description copied from class: Object
        Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:
           getClass().getName() + '@' + Integer.toHexString(hashCode())

        See Writing a useful toString method if you intend implementing your own toString method.

        Overrides:
        toString in class Object
        Returns:
        a printable representation of this object.
      • getStorageIds

        public int[] getStorageIds()
        Returns the list of IDs for all storage units on this device Information about each storage unit can be accessed via getStorageInfo(int).
        Returns:
        the list of storage IDs
      • getObjectHandles

        public int[] getObjectHandles(int storageId,
                             int format,
                             int objectHandle)
        Returns the list of object handles for all objects on the given storage unit, with the given format and parent. Information about each object can be accessed via getObjectInfo(int).
        Parameters:
        storageId - the storage unit to query
        format - the format of the object to return, or zero for all formats
        objectHandle - the parent object to query, or zero for the storage root
        Returns:
        the object handles
      • getObject

        public byte[] getObject(int objectHandle,
                       int objectSize)
        Returns the data for an object as a byte array. This call may block for an arbitrary amount of time depending on the size of the data and speed of the devices.
        Parameters:
        objectHandle - handle of the object to read
        objectSize - the size of the object (this should match MtpObjectInfo.getCompressedSize()
        Returns:
        the object's data, or null if reading fails
      • getThumbnail

        public byte[] getThumbnail(int objectHandle)
        Returns the thumbnail data for an object as a byte array. The size and format of the thumbnail data can be determined via MtpObjectInfo.getThumbCompressedSize() and MtpObjectInfo.getThumbFormat(). For typical devices the format is JPEG.
        Parameters:
        objectHandle - handle of the object to read
        Returns:
        the object's thumbnail, or null if reading fails
      • getStorageInfo

        public MtpStorageInfo getStorageInfo(int storageId)
        Retrieves the MtpStorageInfo for a storage unit.
        Parameters:
        storageId - the ID of the storage unit
        Returns:
        the MtpStorageInfo
      • getObjectInfo

        public MtpObjectInfo getObjectInfo(int objectHandle)
        Retrieves the MtpObjectInfo for an object.
        Parameters:
        objectHandle - the handle of the object
        Returns:
        the MtpObjectInfo
      • deleteObject

        public boolean deleteObject(int objectHandle)
        Deletes an object on the device. This call may block, since deleting a directory containing many files may take a long time on some devices.
        Parameters:
        objectHandle - handle of the object to delete
        Returns:
        true if the deletion succeeds
      • getParent

        public long getParent(int objectHandle)
        Retrieves the object handle for the parent of an object on the device.
        Parameters:
        objectHandle - handle of the object to query
        Returns:
        the parent's handle, or zero if it is in the root of the storage
      • getStorageId

        public long getStorageId(int objectHandle)
        Retrieves the ID of the storage unit containing the given object on the device.
        Parameters:
        objectHandle - handle of the object to query
        Returns:
        the object's storage unit ID
      • importFile

        public boolean importFile(int objectHandle,
                         String destPath)
        Copies the data for an object to a file in external storage. This call may block for an arbitrary amount of time depending on the size of the data and speed of the devices.
        Parameters:
        objectHandle - handle of the object to read
        destPath - path to destination for the file transfer. This path should be in the external storage as defined by Environment.getExternalStorageDirectory()
        Returns:
        true if the file transfer succeeds


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