OS_MorseCode

[MorseCode.java]

public class MorseCode extends Activity
{
    /** Tag string for our debug logs */
    private static final String TAG = "MorseCode";

    /** Our text view */
    private TextView mTextView;

    ;

    /**
     * Initialization of the Activity after it is first created.  Must at least
     * call {@link android.app.Activity#setContentView setContentView()} to
     * describe what is to be displayed in the screen.
     */
    @Override
 protected void onCreate(Bundle savedInstanceState)
    {
        // Be sure to call the super class.
        super.onCreate(savedInstanceState);

        // See assets/res/any/layout/hello_world.xml for this
        // view layout definition, which is being set here as
        // the content of our screen.
        setContentView(R.layout.morse_code);

        // Set the OnClickListener for the button so we see when it's pressed.
        findViewById(R.id.button).setOnClickListener(mClickListener);

        // Save the text view so we don't have to look it up each time
        mTextView = (TextView)findViewById(R.id.text);
    }

    /** Called when the button is pushed */
    View.OnClickListener mClickListener = new View.OnClickListener() {
        public void onClick(View v) {
            // Get the text out of the view
            String text = mTextView.getText().toString();

            // convert it using the function defined above.  See the docs for
            // android.os.Vibrator for more info about the format of this array
            long[] pattern = MorseCodeConverter.pattern(text);

            // Start the vibration
            Vibrator vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
            vibrator.vibrate(pattern, -1);
        }
    };
}

[MorseCodeConverter.java]

/** Class that implements the text to morse code coversion */
class MorseCodeConverter {
    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;

    /** The characters from 'A' to 'Z' */
    private static final long[][] LETTERS = new long[][] {
        /* A */ new long[] { DOT, GAP, DASH },
        /* B */ new long[] { DASH, GAP, DOT, GAP, DOT, GAP, DOT },
        /* C */ new long[] { DASH, GAP, DOT, GAP, DASH, GAP, DOT },
        /* D */ new long[] { DASH, GAP, DOT, GAP, DOT },
        /* E */ new long[] { DOT },
        /* F */ new long[] { DOT, GAP, DOT, GAP, DASH, GAP, DOT },
        /* G */ new long[] { DASH, GAP, DASH, GAP, DOT },
        /* H */ new long[] { DOT, GAP, DOT, GAP, DOT, GAP, DOT },
        /* I */ new long[] { DOT, GAP, DOT },
        /* J */ new long[] { DOT, GAP, DASH, GAP, DASH, GAP, DASH },
        /* K */ new long[] { DASH, GAP, DOT, GAP, DASH },
        /* L */ new long[] { DOT, GAP, DASH, GAP, DOT, GAP, DOT },
        /* M */ new long[] { DASH, GAP, DASH },
        /* N */ new long[] { DASH, GAP, DOT },
        /* O */ new long[] { DASH, GAP, DASH, GAP, DASH },
        /* P */ new long[] { DOT, GAP, DASH, GAP, DASH, GAP, DOT },
        /* Q */ new long[] { DASH, GAP, DASH, GAP, DOT, GAP, DASH },
        /* R */ new long[] { DOT, GAP, DASH, GAP, DOT },
        /* S */ new long[] { DOT, GAP, DOT, GAP, DOT },
        /* T */ new long[] { DASH },
        /* U */ new long[] { DOT, GAP, DOT, GAP, DASH },
        /* V */ new long[] { DOT, GAP, DOT, GAP, DASH },
        /* W */ new long[] { DOT, GAP, DASH, GAP, DASH },
        /* X */ new long[] { DASH, GAP, DOT, GAP, DOT, GAP, DASH },
        /* Y */ new long[] { DASH, GAP, DOT, GAP, DASH, GAP, DASH },
        /* Z */ new long[] { DASH, GAP, DASH, GAP, DOT, GAP, DOT },
    };

    /** The characters from '0' to '9' */
    private static final long[][] NUMBERS = new long[][] {
        /* 0 */ new long[] { DASH, GAP, DASH, GAP, DASH, GAP, DASH, GAP, DASH },
        /* 1 */ new long[] { DOT, GAP, DASH, GAP, DASH, GAP, DASH, GAP, DASH },
        /* 2 */ new long[] { DOT, GAP, DOT, GAP, DASH, GAP, DASH, GAP, DASH },
        /* 3 */ new long[] { DOT, GAP, DOT, GAP, DOT, GAP, DASH, GAP, DASH },
        /* 4 */ new long[] { DOT, GAP, DOT, GAP, DOT, GAP, DOT, GAP, DASH },
        /* 5 */ new long[] { DOT, GAP, DOT, GAP, DOT, GAP, DOT, GAP, DOT },
        /* 6 */ new long[] { DASH, GAP, DOT, GAP, DOT, GAP, DOT, GAP, DOT },
        /* 7 */ new long[] { DASH, GAP, DASH, GAP, DOT, GAP, DOT, GAP, DOT },
        /* 8 */ new long[] { DASH, GAP, DASH, GAP, DASH, GAP, DOT, GAP, DOT },
        /* 9 */ new long[] { DASH, GAP, DASH, GAP, DASH, GAP, DASH, GAP, DOT },
    };

    private static final long[] ERROR_GAP = new long[] { GAP };

    /** Return the pattern data for a given character */
    static long[] pattern(char c) {
        if (c >= 'A' && c <= 'Z') {
            return LETTERS[c - 'A'];
        }
        if (c >= 'a' && c <= 'z') {
            return LETTERS[c - 'a'];
        }
        else if (c >= '0' && c <= '9') {
            return NUMBERS[c - '0'];
        }
        else {
            return ERROR_GAP;
        }
    }

    static long[] pattern(String str) {
        boolean lastWasWhitespace;
        int strlen = str.length();

        // Calculate how long our array needs to be.
        int len = 1;
        lastWasWhitespace = true;
        for (int i=0; i<strlen; i++) {
            char c = str.charAt(i);
            if (Character.isWhitespace(c)) {
                if (!lastWasWhitespace) {
                    len++;
                    lastWasWhitespace = true;
                }
            } else {
                if (!lastWasWhitespace) {
                    len++;
                }
                lastWasWhitespace = false;
                len += pattern(c).length;
            }
        }

        // Generate the pattern array.  Note that we put an extra element of 0
        // in at the beginning, because the pattern always starts with the pause,
        // not with the vibration.
        long[] result = new long[len+1];
        result[0] = 0;
        int pos = 1;
        lastWasWhitespace = true;
        for (int i=0; i<strlen; i++) {
            char c = str.charAt(i);
            if (Character.isWhitespace(c)) {
                if (!lastWasWhitespace) {
                    result[pos] = WORD_GAP;
                    pos++;
                    lastWasWhitespace = true;
                }
            } else {
                if (!lastWasWhitespace) {
                    result[pos] = LETTER_GAP;
                    pos++;
                }
                lastWasWhitespace = false;
                long[] letter = pattern(c);
                System.arraycopy(letter, 0, result, pos, letter.length);
                pos += letter.length;
            }
        }
        return result;
    }
}