LedPedometer-3.註冊界面和Android隨機生成圖片驗證碼

註冊界面

類似於微信上必須全部輸入內容後按鈕才能點擊

• 設置4個boolean值
• 給EditText添加文本內容改變listener

自動生成驗證碼

轉載鏈接：http://blog.csdn.net/onlyonecoder/article/details/8231373

public class VertifiedCodeUtils {  

    private static final char[] CHARS = {  
        '2', '3', '4', '5', '6', '7', '8', '9',  
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'l', 'm',   
        'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',  
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',   
        'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'  
    };  

    private static VertifiedCodeUtils bmpCode;  

    public static VertifiedCodeUtils getInstance() {  
        if(bmpCode == null)  
            bmpCode = new VertifiedCodeUtils();  
        return bmpCode;  
    }  

    //default settings  
    private static final int DEFAULT_CODE_LENGTH = 4;  
    private static final int DEFAULT_FONT_SIZE = 20;  
    private static final int DEFAULT_LINE_NUMBER = 2;  
    private static final int BASE_PADDING_LEFT = 5, RANGE_PADDING_LEFT = 5, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;  
    private static final int DEFAULT_WIDTH = 60, DEFAULT_HEIGHT = 40;  

    //settings decided by the layout xml  
    //canvas width and height  
    private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;   

    //random word space and pading_top  
    private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,   
            base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;  

    //number of chars, lines; font size  
    private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;  

    //variables  
    private String code;  
    private int padding_left, padding_top;  
    private Random random = new Random();  
    //驗證碼圖片  
    public Bitmap createBitmap() {  
        padding_left = 0;  

        Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);   
        Canvas c = new Canvas(bp);  

        code = createCode();  

        c.drawColor(Color.WHITE);  
        Paint paint = new Paint();  
        paint.setTextSize(font_size);  

        for (int i = 0; i < code.length(); i++) {  
            randomTextStyle(paint);  
            randomPadding();  
            c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);  
        }  

        for (int i = 0; i < line_number; i++) {  
            drawLine(c, paint);  
        }  

        c.save( Canvas.ALL_SAVE_FLAG );//保存    
        c.restore();//  
        return bp;  
    }  

    public String getCode() {  
        return code;  
    }  

    //驗證碼  
    private String createCode() {  
        StringBuilder buffer = new StringBuilder();  
        for (int i = 0; i < codeLength; i++) {  
            buffer.append(CHARS[random.nextInt(CHARS.length)]);  
        }  
        return buffer.toString();  
    }  

    private void drawLine(Canvas canvas, Paint paint) {  
        int color = randomColor();  
        int startX = random.nextInt(width);  
        int startY = random.nextInt(height);  
        int stopX = random.nextInt(width);  
        int stopY = random.nextInt(height);  
        paint.setStrokeWidth(1);  
        paint.setColor(color);  
        canvas.drawLine(startX, startY, stopX, stopY, paint);  
    }  

    private int randomColor() {  
        return randomColor(1);  
    }  

    private int randomColor(int rate) {  
        int red = random.nextInt(256) / rate;  
        int green = random.nextInt(256) / rate;  
        int blue = random.nextInt(256) / rate;  
        return Color.rgb(red, green, blue);  
    }  

    private void randomTextStyle(Paint paint) {  
        int color = randomColor();  
        paint.setColor(color);  
        paint.setFakeBoldText(random.nextBoolean());  //true爲粗體，false爲非粗體  
        float skewX = random.nextInt(11) / 10;  
        skewX = random.nextBoolean() ? skewX : -skewX;  
        paint.setTextSkewX(skewX); //float類型參數，負數表示右斜，整數左斜  
//      paint.setUnderlineText(true); //true爲下劃線，false爲非下劃線  
//      paint.setStrikeThruText(true); //true爲刪除線，false爲非刪除線  
    }  

    private void randomPadding() {  
        padding_left += base_padding_left + random.nextInt(range_padding_left);  
        padding_top = base_padding_top + random.nextInt(range_padding_top);  
    }  
}  

使用：
btnVetified.setBackground(new BitmapDrawable(VertifiedCodeUtils
                        .getInstance().createBitmap()));
                System.out.println(VertifiedCodeUtils.getInstance().getCode());
                vertifiedCode = VertifiedCodeUtils.getInstance().getCode();