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Android Reference

BluetoothSocket


android.bluetooth

Class BluetoothSocket

    • Method Detail

      • 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
      • getRemoteDevice

        public BluetoothDevice getRemoteDevice()
        Get the remote device this socket is connecting, or connected, to.
        Returns:
        remote device
      • getInputStream

        public InputStream getInputStream()
                                   throws IOException
        Get the input stream associated with this socket.

        The input stream will be returned even if the socket is not yet connected, but operations on that stream will throw IOException until the associated socket is connected.

        Returns:
        InputStream
        Throws:
        IOException
      • getOutputStream

        public OutputStream getOutputStream()
                                     throws IOException
        Get the output stream associated with this socket.

        The output stream will be returned even if the socket is not yet connected, but operations on that stream will throw IOException until the associated socket is connected.

        Returns:
        OutputStream
        Throws:
        IOException
      • isConnected

        public boolean isConnected()
        Get the connection status of this socket, ie, whether there is an active connection with remote device.
        Returns:
        true if connected false if not connected
      • connect

        public void connect()
                     throws IOException
        Attempt to connect to a remote device.

        This method will block until a connection is made or the connection fails. If this method returns without an exception then this socket is now connected.

        Creating new connections to remote Bluetooth devices should not be attempted while device discovery is in progress. Device discovery is a heavyweight procedure on the Bluetooth adapter and will significantly slow a device connection. Use BluetoothAdapter.cancelDiscovery() to cancel an ongoing discovery. Discovery is not managed by the Activity, but is run as a system service, so an application should always call BluetoothAdapter.cancelDiscovery() even if it did not directly request a discovery, just to be sure.

        close() can be used to abort this call from another thread.

        Throws:
        IOException - on error, for example connection failure
      • close

        public void close()
                   throws IOException
        Description copied from interface: Closeable
        Closes the object and release any system resources it holds.

        Although only the first call has any effect, it is safe to call close multiple times on the same object. This is more lenient than the overridden AutoCloseable.close(), which may be called at most once.

        Specified by:
        close in interface Closeable
        Specified by:
        close in interface AutoCloseable
        Throws:
        IOException


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