生成本地难码图片并在本地记录图片上的数字以作比较

1.用法  

Bitmap  valimg = new CreateValiImage(this).onDraw();




public class CreateValiImage {
    private Paint paint;
    private Canvas canvas;
    private float width;
    private float height;
    private int retate = 6;
    private SharedUtils sharedUtils;

    private Context context;


    public CreateValiImage(Context context) {
        this.context = context;
        sharedUtils = new SharedUtils(context);
        paint = new Paint();
        width = context.getResources().getDimension(R.dimen.register_img_100);
        height = context.getResources().getDimension(R.dimen.frame_title);


    }


    public Bitmap onDraw() {
        Bitmap bitmap = Bitmap.createBitmap((int) width, (int) height, Bitmap.Config.ARGB_8888);
        canvas = new Canvas(bitmap);
        //画背景
        paint.setColor(Color.GRAY);
        RectF rectF = new RectF(0, 0, width, height);
        canvas.drawRect(rectF, paint);
        //画干扰线
        paint.setStrokeWidth(2);
        for (int i = 0; i < 7; i++) {
            paint.setColor(Color.rgb(getValiNum(0, 255), getValiNum(0, 255), getValiNum(0, 255)));
            canvas.drawLine(getValiNum(0, (int) width), getValiNum(0, (int) height), getValiNum(0, (int) width), getValiNum(0, (int) height), paint);
        }

        //画文字
        paint.setTextSize(60);
        paint.setStrokeWidth(1);
        StringBuffer stringBuffer = new StringBuffer();
        for (int i = 0; i < 4; i++) {
            paint.setColor(Color.rgb(getValiNum(0, 255), getValiNum(0, 255), getValiNum(0, 255)));
            canvas.rotate(getValiNum(0, retate), 0f, 0f);
            int item = getValiNum(0, 9);
            stringBuffer.append(item);
            canvas.drawText(item + "", 20 + (60 * i), 70, paint);
            canvas.rotate(-1 * getValiNum(0, retate), 0f, 0f);
        }
        sharedUtils.setValiNum(stringBuffer.toString());

        return bitmap;
    }

    public int getValiNum(int begin, int end) {
        Random random = new Random();
        return random.nextInt(end - begin) + begin;
    }


}