android 数字验证码

package com.ten.txtView; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PointF; import android.graphics.Rect; import android.support.annotation.Nullable; import android.util.AttributeSet; import android.util.TypedValue; import android.view.View; import java.util.HashSet; import java.util.Random; import java.util.Set; /** * Created by Ten on 2017/5/23 0023. */ public class TxtView extends View { private String mTxtText; private int mTxtColor; private int mTxtSize; private int mTxtBackgroundColor; private Random random = new Random(); private Rect mBound; private Paint mPaint; public TxtView(Context context) { this(context, null); } public TxtView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } // 获取自定义样式的属性 public TxtView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.txtView, defStyleAttr, 0); int num = array.length(); for (int i = 0; i < num; i++) { int attr = array.getIndex(i); switch (attr) { case R.styleable.txtView_txtContent: mTxtText = array.getString(attr); break; case R.styleable.txtView_txtColor: mTxtColor = array.getColor(attr, Color.BLACK); break; case R.styleable.txtView_txtBackgroundColor: mTxtBackgroundColor = array.getColor(attr, Color.YELLOW); break; case R.styleable.txtView_txtSize: mTxtSize = array.getDimensionPixelSize(attr, (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics() )); break; } } array.recycle(); mPaint = new Paint(); mPaint.setTextSize(mTxtSize); mBound = new Rect(); mPaint.getTextBounds(mTxtText, 0, mTxtText.length(), mBound); this.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mTxtText = randomText(); postInvalidate(); } }); } private String randomText() { Random random = new Random(); Set<Integer> set = new HashSet<>(); while (set.size() < 4) { int randomInt = random.nextInt(10); set.add(randomInt); } StringBuffer stringBuffer = new StringBuffer(); for (Integer i : set) { stringBuffer.append("" + i); } return stringBuffer.toString(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); int width, height; if (widthMode == MeasureSpec.EXACTLY) { width = widthSize; } else { mPaint.setTextSize(mTxtSize); mPaint.getTextBounds(mTxtText, 0, mTxtText.length(), mBound); float textWidth = mBound.width(); int desired = (int) (getPaddingLeft() + textWidth + getPaddingRight()); width = desired; } if (heightMode == MeasureSpec.EXACTLY) { height = heightSize; } else { mPaint.setTextSize(mTxtSize); mPaint.getTextBounds(mTxtText, 0, mTxtText.length(), mBound); float textHeight = mBound.height(); int desired = (int) (getPaddingTop() + textHeight + getPaddingBottom()); height = desired; } setMeasuredDimension(width, height); } @Override protected void onDraw(Canvas canvas) { mPaint.setColor(mTxtBackgroundColor); canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint); mPaint.setAntiAlias(true); mPaint.setTextSize(mTxtSize); randomTextStyle(mPaint); canvas.drawText(mTxtText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mPaint); for (int i = 0; i<4;i++){ drawLine(canvas,mPaint); } mPaint.setColor(randomColor()); for (int i = 0; i < 50; i++) { drawPoint(canvas, mPaint); } } public String getCode(){ return mTxtText; } // 画干扰点 private void drawPoint(Canvas canvas, Paint paint) { PointF pointF = new PointF(random.nextInt(canvas.getWidth()), random.nextInt(canvas.getHeight())); canvas.drawPoint(pointF.x, pointF.y, paint); } //画干扰线 private void drawLine(Canvas canvas, Paint paint) { int color = randomColor(); int startX = random.nextInt(canvas.getWidth()); int startY = random.nextInt(canvas.getHeight()); int stopX = random.nextInt(canvas.getWidth()); int stopY = random.nextInt(canvas.getHeight()); paint.setStrokeWidth(1); paint.setColor(color); canvas.drawLine(startX, startY, stopX, stopY, paint); } //生成随机颜色 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); } //随机生成文字样式，颜色，粗细，倾斜度 private void randomTextStyle(Paint paint) { int color = randomColor(); paint.setColor(color); } }