C172 PLT WHILE TAXIING FOR TKOF AT AN UNCTLED FIELD HAS A RWY INCURSION AND NEAR MISS WITH A DEPARTING ACFT.

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I HAD JUST LANDED ON RWY 28. SKY WAS CLR; WIND WAS FROM ABOUT 250 DEGS AT 7-9 KTS. I CLRED THE ACTIVE RWY AT TXWY A; AND ANNOUNCED ON CTAF 'SKYHAWK 172; CLR OF THE ACTIVE.' MOST OF THE ACFT ARE HANGARED ON THE S SIDE OF THE AIRFIELD; WHILE THE TXWYS AND FBO ARE ON THE N SIDE OF THE FIELD. THIS REQUIRES THAT AFTER LNDG; MOST OF THE ACFT MUST CROSS THE ACTIVE AT A POINT MID-FIELD. IT IS THE ACCEPTED CUSTOM FOR ALL XING ACFT TO ANNOUNCE THEIR INTENTION TO CROSS THE ACTIVE AND THEN ANNOUNCE WHEN THEY ARE CLR. I TAXIED TOWARDS THE MIDFIELD CROSSOVER; AND ANNOUNCED 'SKYHAWK 172 XING THE ACTIVE RWY MIDFIELD ON THE GND.' I WAS STILL 15 SECONDS FROM THE HOLD SHORT LINE AT THIS POINT; AND STILL ON THE TXWY; LOOKING DOWN THE ACTIVE RWY. I HAD HEARD ANOTHER CESSNA ANNOUNCE ON CTAF THAT HE WAS TURNING ONTO A 3 MI FINAL; AND COULD SEE HIS LNDG LIGHTS IN THE DISTANCE. AT THIS POINT; I HEARD A DIAMOND STAR 2 SEATER THAT HAD DEPARTED AFTER I HAD; ANNOUNCE STRAIGHT-IN 5 MI FINAL FOR RWY 28. I STOPPED AT THE HOLD SHORT LINE; AND LOOKED DOWN THE RWY; AND NOW SAW BOTH INBOUND ACFT; EASILY VISIBLE BECAUSE OF THEIR LNDG LIGHTS. NEITHER ACFT WAS A FACTOR; SO I PROCEEDED ONTO ACTIVE RWY. JUST AS I PASSED THE HOLD SHORT LINE; A DARK ORANGE LOW WING PIPER ACFT; PROBABLY AN ARROW OR SIMILAR; PASSED IN FRONT OF ME ON THE ACTIVE RWY AT APPROX 40 KTS; AS IT TURNED OUT; DEPARTING ON RWY 28. I BRAKED; BUT AS I WAS NOW ON THE ACTIVE RWY AND THE ACFT HAD PASSED; I PROCEEDED ACROSS; AND ANNOUNCED ON CTAF 'CLR THE ACTIVE.'