android GPS 应用

/** Callback with location information. */
typedef void (* gps_location_callback)(GpsLocation* location);

/** Callback with status information. */
typedef void (* gps_status_callback)(GpsStatus* status);

/** Callback with SV status information. */
typedef void (* gps_sv_status_callback)(GpsSvStatus* sv_info);

/** GPS callback structure. */


typedef struct {
        gps_location_callback location_cb;
        gps_status_callback status_cb;
        gps_sv_status_callback sv_status_cb;
} GpsCallbacks;

/*GPS 接口*/
typedef struct {
    /**
     * Opens the interface and provides the callback routines
     * to the implemenation of this interface.
     */
    int ( * init) ( GpsCallbacks* callbacks ) ;

    /** Starts navigating. */
    int ( * start) ( void ) ;

    /** Stops navigating. */
    int ( * stop) ( void ) ;

    /** Closes the interface. */
    void ( * cleanup) ( void ) ;

    /** Injects the current time. */
    int ( * inject_time) ( GpsUtcTime time , int64_t timeReference,
                         int uncertainty) ;

    /** Injects current location from another location provider
     * (typically cell ID).
     * latitude and longitude are measured in degrees
     * expected accuracy is measured in meters
     */
    int ( * inject_location) ( double latitude, double longitude, float accuracy) ;

    /**
     * Specifies that the next call to start will not use the
     * information defined in the flags. GPS_DELETE_ALL is passed for
     * a cold start.
     */
    void ( * delete_aiding_data) ( GpsAidingData flags) ;

    /**
     * fix_frequency represents the time between fixes in seconds.
     * Set fix_frequency to zero for a single-shot fix.
     */
    int ( * set_position_mode) ( GpsPositionMode mode, int fix_frequency) ;

    /** Get a pointer to extension information. */
    const void * ( * get_extension) ( const char * name) ;
} GpsInterface;