package com.ayqy.app_test;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.widget.EditText;public class myEditText extends EditText{private int lineColor;//横线颜色private float lineWidth;//横线宽度public myEditText(Context context) {super(context);//设置默认颜色和横线宽度lineColor = Color.BLUE;//默认蓝色线lineWidth = 0.5f;//默认宽度为0.5
    }public myEditText(Context context,int color,float width) {super(context);//设置颜色和横线宽度this.lineColor = color;this.lineWidth = width;}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stub
        super.onDraw(canvas);//创建画笔Paint mPaint = new Paint();mPaint.setStrokeWidth(lineWidth);mPaint.setStyle(Paint.Style.FILL);mPaint.setColor(lineColor);//获取参数int padL = this.getPaddingLeft();//获取框内左边留白int padR = this.getPaddingRight();//获取框内右边留白int padT = this.getPaddingTop();//获取框内顶部留白int lines = this.getLineCount();//获取行数float size = this.getTextSize();//获取字体大小float baseTop = padT + size / 6;//从上向下第一条线的位置/*这里需要说明的是size/6这个值，是偶然测试得到的，近似于行距的一半*为什么不用EditText.getLineSpacingExtra();来获取行距？*因为测试发现若调用EditText的getLineSpacingExtra方法会报NoSuchMethod错误，具体原因不明*测试发现行距的值近似于TextSize的1/3，在需要用到行距的时候可以用这个值来代替getLineSpacingExtra方法* */float gap = this.getLineHeight();//获取行宽//从上向下划线for(int i = 1;i <= lines;i++){canvas.drawLine(padL//startX, baseTop + gap * i//startY, this.getWidth() - padR//endX, baseTop + gap * i//endY
                    , mPaint);}}public int getLineColor() {return lineColor;}public void setLineColor(int color) {this.lineColor = color;}public float getLineWidth() {return lineWidth;}public void setLineWidth(float width) {this.lineWidth = width;}}