---layout  (activity_main.xml)
	add 
	3 buttons

---permision (AndroidManifest.xml)
	add 
	<uses-permission android:name="android.permission.VIBRATE"/>

---global variable 全域變數
	long[] vibratepattern = {100, 400, 500};			
	Vibrator vib;

---onCreate
	vib = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);		


---button implement	
	public void btn_test1(View v){
		vib.vibrate(300);		
	}
	
	public void btn_test2(View v){
		vib = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);			
		vib.vibrate(vibratepattern, 0);		
	}	
	
	public void btn_test3(View v){
		vib.cancel();	
	}