Android ApiDemos樣本解析(89):OS->Morse Code

本例介紹了OS中的Vibrator （震動）的用法，類MorseCodeConverter 提供了將字母數字到 Morse code 轉換:

 

比如：/* A */ new long[] { DOT, GAP, DASH }  分別對應Dot , Gap, Dash

DOT,GAP ,DASH 對應的時間定義為：

[java] 
private static final long SPEED_BASE = 100; 
static final long DOT = SPEED_BASE; 
static final long DASH = SPEED_BASE * 3; 
static final long GAP = SPEED_BASE; 
static final long LETTER_GAP = SPEED_BASE * 3; 
static final long WORD_GAP = SPEED_BASE * 7; 

private static final long SPEED_BASE = 100;
static final long DOT = SPEED_BASE;
static final long DASH = SPEED_BASE * 3;
static final long GAP = SPEED_BASE;
static final long LETTER_GAP = SPEED_BASE * 3;
static final long WORD_GAP = SPEED_BASE * 7;有了這個轉換表，就可以使用vibrator 利用震動發送Morse code.

[java] 
long[] pattern = MorseCodeConverter.pattern(text); 
  
// Start the vibration  
Vibrator vibrator 
 = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE); 
vibrator.vibrate(pattern, -1); 

long[] pattern = MorseCodeConverter.pattern(text);
 
// Start the vibration
Vibrator vibrator
 = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(pattern, -1);
public void vibrate(long[] pattern, int repeat) 可以讓裝置以指定的模式來震動手機。repeat 為重複的次數，-1表示不重複。

此外Vibrator 還提供了public void vibrate(long milliseconds) 可以使手機震動給定時間。

 
作者：mapdigit