自定义view实现数字点击变换功能

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package com.bwie.chentong.rikao0928;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;import java.util.HashSet;import java.util.Random;import java.util.Set;public class MyTextView extends View{    private String mTitleText;    private int mTitleTextColor;    private int mTitleTextSize;    /**     * 画笔     */    private Paint mPaint;    /**     * view的矩形背景     */    private Rect mBound;    public MyTextView(Context context) {        this(context,null);    }    public MyTextView(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public MyTextView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.MyTextView, defStyleAttr, 0);        mTitleText = randomText(); //初始化显示的数字        for (int i = 0; i < a.getIndexCount(); i++) {            int attr = a.getIndex(i);            switch (attr) {                case R.styleable.MyTextView_titleText:                    mTitleText = a.getString(attr);                    break;                case R.styleable.MyTextView_titleTextColor:                    mTitleTextColor = a.getColor(attr, Color.BLACK);                    break;                case R.styleable.MyTextView_titleTextSize:                    //设置默认大小为16                    mTitleTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(                            TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));                    break;            }    }        //将TypedArray对象回收        a.recycle();        /**         * 初始化画笔         */        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setTextSize(mTitleTextSize);        mPaint.setColor(mTitleTextColor);        mBound = new Rect();        mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);        /**         * 模仿点击换验证码         */        this.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View view) {                mTitleText = randomText();                postInvalidate();            }        });    }    /**     * 获取四位随机数验证码     *     * @return     */    private String randomText() {        Random random = new Random();        Set<Integer> set = new HashSet<Integer>();        while (set.size() < 4) {            int randomInt = random.nextInt(10);            set.add(randomInt);        }        StringBuffer sb = new StringBuffer();        for (Integer i : set) {            sb.append("" + i);        }        return sb.toString();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        /**         * 处理当宽高都是wrap_content的情况         */        int widthMode = MeasureSpec.getMode(widthMeasureSpec);        int widthSize = MeasureSpec.getSize(widthMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        int heightSize = MeasureSpec.getSize(heightMeasureSpec);        int width = 0;        int height = 0;        if (widthMode == MeasureSpec.EXACTLY) {            width = widthSize;        } else {            mPaint.setTextSize(mTitleTextSize);            mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);            float textWidth = mBound.width();            int desired = (int) (getPaddingLeft() + textWidth + getPaddingRight());            width = desired;        }        if (heightMode == MeasureSpec.EXACTLY) {            height = heightSize;        } else {            mPaint.setTextSize(mTitleTextSize);            mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);            float textWidth = mBound.height();            int desired = (int) (getPaddingTop() + textWidth + getPaddingBottom());            height = desired;        }        setMeasuredDimension(width, height);    }    @Override    protected void onDraw(Canvas canvas) {        /**         * 绘制文字和矩形         */        mPaint.setColor(Color.YELLOW);        canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);        mPaint.setColor(mTitleTextColor);        canvas.drawText(mTitleText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mPaint);    }}
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