android 验证码，带干扰线，干扰点，字体方向改变

灰太狼 2022-07-14 05:42 128阅读 0赞

先上图

![Center][]

在数字加英文，想加中文也可以，自己可以去改，项目没这个要求就不做了，也不会太难。

一个类就完事，点击图片直接更换。

记得在调用的时候不要给它设置setOnClickListener(),否则没有点击更新，因为你覆盖掉了。

package com.example.authcodeview.view;
    
    import java.util.Random;
    
    import com.example.authcodeview.R;
    
    import android.content.Context;
    import android.content.res.TypedArray;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Rect;
    import android.util.AttributeSet;
    import android.util.TypedValue;
    import android.view.View;
    
    
    /**
     * 注意：不要给这个组件添加点击事件，连setOnClickListener(this)也不要，否则就没有点击图片换图的功能
     */
    public class AuthCodeView extends View
    {
    	// 点数设置
    	public static final int POINT_NUM = 100;
    	// 线段数设置
    	public static final int LINE_NUM = 2;
    	//文本
    	private String mTitleText;
    	// 文本的颜色
    	private int mTitleTextColor;
    	// 文本的大小
    	private int mTitleTextSize;
    	
    	String[] mCheckNum = new String[4];
    	Random random = new Random();
    	
    	//绘制时控制文本绘制的范围
    	private Rect mBound;
    	private Paint mPaint;
    
    	public AuthCodeView(Context context, AttributeSet attrs)
    	{
    		this(context, attrs, 0);
    	}
    
    	public AuthCodeView(Context context)
    	{
    		this(context, null);
    	}
    
    	/**
    	 * 获得我自定义的样式属性
    	 * 
    	 * @param context
    	 * @param attrs
    	 * @param defStyle
    	 */
    	public AuthCodeView(Context context, AttributeSet attrs, int defStyle)
    	{
    		super(context, attrs, defStyle);
    		/**
    		 * 获得我们所定义的自定义样式属性
    		 */
    		TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.AuthCodeView, defStyle, 0);
    		
    		//获取在attr文件下，名字为AuthCodeView的declare-styleable属性有几个
    		int n = a.getIndexCount();
    		for (int i = 0; i < n; i++)
    		{
    			int attr = a.getIndex(i);
    			switch (attr)
    			{
    			//这个属性可以不要，因为都是随机产生
    			case R.styleable.AuthCodeView_titleText:
    				mTitleText = a.getString(attr);
    				break;
    			case R.styleable.AuthCodeView_titleTextColor:
    				// 默认颜色设置为黑色
    				mTitleTextColor = a.getColor(attr, Color.BLACK);
    				break;
    			case R.styleable.AuthCodeView_titleTextSize:
    				// 默认设置为16sp，TypeValue也可以把sp转化为px
    				mTitleTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
    						TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
    				break;
    
    			}
    
    		}
    		a.recycle();
    		
    		mTitleText = randomText();
    
    		/**
    		 * 获得绘制文本的宽和高
    		 */
    		mPaint = new Paint();
    		mPaint.setTextSize(mTitleTextSize);
    		mBound = new Rect();
    		mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);
    
    		this.setOnClickListener(new OnClickListener()
    		{
    
    			@Override
    			public void onClick(View v)
    			{
    				mTitleText = randomText();
    				postInvalidate();
    			}
    
    		});
    
    	}
    	
    	//随机产生验证码
    	private String randomText()
    	{
    		StringBuffer sbReturn = new StringBuffer();
    
    
    		String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    		Random random = new Random();
    		StringBuffer sb = new StringBuffer();
    
    		for (int k = 0; k < 4; k++) {
    			int number = random.nextInt(base.length());
    
    			mCheckNum[k] = String.valueOf(base.charAt(number));
    
    			sb.append(base.charAt(number));
    		}
    		return sb.toString();
    
    
    //		for (int i = 0; i < 4; i++) {
    //			StringBuffer sb = new StringBuffer();
    //			int randomInt = random.nextInt(10);
    //
    //			mCheckNum[i] = sb.append(randomInt).toString();
    //			sbReturn.append(randomInt);
    //		}
    		
    //		return sbReturn.toString();
    	}
    	
    	//获取验证码
    	public String getAuthCode() {
    		return mTitleText;
    	}
    
    	//重写这个方法，设置自定义view控件的大小
    	@Override
    	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    	{
    		// super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    
    		int width = 0;
    		int height = 0;
    
    		/**
    		 * 设置宽度
    		 */
    		int specMode = MeasureSpec.getMode(widthMeasureSpec);
    		int specSize = MeasureSpec.getSize(widthMeasureSpec);
    		switch (specMode)
    		{
    		case MeasureSpec.EXACTLY:// 明确指定了
    			width = getPaddingLeft() + getPaddingRight() + specSize;
    			break;
    		case MeasureSpec.AT_MOST:// 一般为WARP_CONTENT
    			width = getPaddingLeft() + getPaddingRight() + mBound.width();
    			break;
    		}
    
    		/**
    		 * 设置高度
    		 */
    		specMode = MeasureSpec.getMode(heightMeasureSpec);
    		specSize = MeasureSpec.getSize(heightMeasureSpec);
    		switch (specMode)
    		{
    		case MeasureSpec.EXACTLY:// 明确指定了
    			height = getPaddingTop() + getPaddingBottom() + specSize;
    			break;
    		case MeasureSpec.AT_MOST:// 一般为WARP_CONTENT
    			height = getPaddingTop() + getPaddingBottom() + mBound.height();
    			break;
    		}
    
    		setMeasuredDimension(width, height);
    
    	}
    
    	@Override
    	protected void onDraw(Canvas canvas)
    	{
    		//画背景颜色
    		mPaint.setColor(Color.WHITE);
    		canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);
    		
    		//划线 
    		mPaint.setColor(mTitleTextColor);
    		int [] line;
    		for(int i = 0; i < LINE_NUM; i ++)
    		{
    			//设置线宽
    			mPaint.setStrokeWidth(5);
    			line = getLine(getMeasuredHeight(), getMeasuredWidth());
                canvas.drawLine(line[0], line[1], line[2], line[3], mPaint);
            } 
    		
    		// 绘制小圆点
    		int [] point; 
    		int randomInt;
    		for(int i = 0; i < POINT_NUM; i ++)    
    		{
    			//随机获取点的大小
    			randomInt = random.nextInt(5);
    			point = getPoint(getMeasuredHeight(), getMeasuredWidth());
                canvas.drawCircle(point[0], point[1], randomInt, mPaint);
            }
    
    		//绘制验证控件上的文本
    		int dx = 20; 
    		for(int i = 0; i < 4; i ++){
    			canvas.drawText("" + mCheckNum[i],dx, getHeight() / 2 + getPositon(mBound.height() / 2), mPaint);
                dx += (getWidth() / 2 - mBound.width() / 2) + i / 5 + 20;
            }
    //		canvas.drawText(mTitleText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mPaint);
    	}
    	
    	//计算验证码的绘制y点位置
    	private  int getPositon(int height) {
    		int tempPositoin = (int) (Math.random() * height);
    		if (tempPositoin < 20) {
    			tempPositoin += 20;
    		}
    		return tempPositoin;
    	}
    	
    	// 随机产生点的圆心点坐标
    	public static int[] getPoint(int height, int width) {
    		int[] tempCheckNum = { 0, 0, 0, 0 };
    		tempCheckNum[0] = (int) (Math.random() * width);
    		tempCheckNum[1] = (int) (Math.random() * height);
    		return tempCheckNum;
    	}
    	
    	//随机产生划线的起始点坐标和结束点坐标
    	public static int[] getLine(int height, int width) {
    		int[] tempCheckNum = { 0, 0, 0, 0 };
    		for (int i = 0; i < 4; i += 2) {
    			tempCheckNum[i] = (int) (Math.random() * width);
    			tempCheckNum[i + 1] = (int) (Math.random() * height);
    		}
    		return tempCheckNum;
    	}
    }

demo：[http://download.csdn.net/detail/qq\_34884729/9696798][http_download.csdn.net_detail_qq_34884729_9696798]

[Center]: /images/20220714/e01b2b12a5144284ab0611ebcdae5e9c.png
[http_download.csdn.net_detail_qq_34884729_9696798]: http://download.csdn.net/detail/qq_34884729/9696798