Android开发教程随机数字验证码
随机数验证码,在图中显示,让用户输入对不对
一、思路:
自定义控件CheckView
二、效果图:

三、关键代码:
            
            
              java
              
              
            
          
          public class CheckView extends View {
    Context mContext;
    int [] CheckNum = null;
    Paint mTempPaint = new Paint();
    // 验证码
    public CheckView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        mTempPaint.setAntiAlias(true);
        mTempPaint.setTextSize(Config.TEXT_SIZE);
        mTempPaint.setStrokeWidth(3);
    }
    public void onDraw(Canvas canvas){
        canvas.drawColor(Config.COLOR);
        final int height = getHeight();//获得CheckView控件的高度
        final int width = getWidth();//获得CheckView控件的宽度
        int dx = 40;
        for(int i = 0; i < 4; i ++){//绘制验证控件上的文本
            canvas.drawText("" + CheckNum[i],  dx, CheckUtil.getPositon(height), mTempPaint);
            dx += width/ 5;
        }
        int [] line;
        for(int i = 0; i < Config.LINE_NUM; i ++){//划线
            line = CheckUtil.getLine(height, width);
            canvas.drawLine(line[0], line[1], line[2], line[3], mTempPaint);
        }
        // 绘制小圆点
        int [] point;
        for(int i = 0; i < Config.POINT_NUM; i ++)    {//画点
            point=CheckUtil.getPoint(height, width);
            canvas.drawCircle(point[0], point[1], 1, mTempPaint);
        }
    }
    public void setCheckNum(int [] chenckNum) {//设置验证码
        CheckNum = chenckNum;
    }
    public int[] getCheckNum() {//获得验证码
        return CheckNum;
    }
    public void invaliChenkNum() {
        invalidate();
    }
}四、项目demo源码结构图:

有问题或者需要完整源码的私信我