Merge "Add javadoc to Handler.Callback.handleMessage"

    /**

     * Callback interface you can use when instantiating a Handler to avoid

     * having to implement your own subclass of Handler.

     *

     * @param msg A {@link android.os.Message Message} object

     * @return True if no further handling is desired

     */

    public interface Callback {

        public boolean handleMessage(Message msg);