仿支付宝的密码均分输入框

此为安卓项目，通过重绘edittext进行文字的均分排布。直接贴上代码吧

package com.xxx.xxx;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.text.Editable;import android.text.Selection;import android.text.TextWatcher;import android.util.AttributeSet;import android.view.ViewGroup;import android.widget.EditText;/** * 此控件为均分输入框控件 * 使用说明：XML文件中设置好文字大小，设置好宽度。高度使用wrap_content更佳，亦可设置固定高度 * （随着输入的行数变化会导致高度成倍增加） * 允许设置每行显示的文字个数 * 允许设置最多显示多少行 * 允许设置密码符显示 * 允许设置多行输入 * * Created by yueer on 2015/10/22. */public class ExcelEditView extends EditText {    private int mMaxLength = 6;    //一行显示的最大字符数    private int mColorId = Color.BLACK;      //字体颜色    private boolean isPassword = false;    //是否需要显示密码符    private float mHeight = 0.0f;       //默认情况的高度    private int mMaxLine = 0;          //最大的行数：如果为0,---表示支持多行输入   不为0，--则为该行    public ExcelEditView(Context context){        super(context);        init();    }    public ExcelEditView(Context context, AttributeSet set){        super(context, set);        init();    }    private void init(){        this.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {                // TODO Auto-generated method stub                Editable editable = ExcelEditView.this.getText();                int len = editable.length();                if(mMaxLine > 0 && len > mMaxLength*mMaxLine)                {                    int selEndIndex = Selection.getSelectionEnd(editable);                    String str = editable.toString();                    String newStr = str.substring(0,mMaxLength*mMaxLine);                    ExcelEditView.this.setText(newStr);                    editable = ExcelEditView.this.getText();                    //新字符串的长度                    int newLen = editable.length();                    //旧光标位置超过字符串长度                    if(selEndIndex > newLen)                    {                        selEndIndex = editable.length();                    }                    //设置新光标所在的位置                    Selection.setSelection(editable, selEndIndex);                }            }            @Override            public void afterTextChanged(Editable s) {            }        });    }    public void setIsPassword(boolean isPassword){        this.isPassword = isPassword;    }    public void setmMaxLine(int line){        this.mMaxLine = line;    }    public void setmMaxLength(int leng){        this.mMaxLength = leng;    }    @Override    public void setTextColor(int color) {        super.setTextColor(color);        mColorId = color;    }    @Override    protected void onDraw(Canvas canvas) {        char[] txt = this.getText().toString().toCharArray();      //取出字符数组        int txtLine = getLineFromCharArray(txt);      //计算有多少行        if (mMaxLine > 0 && txtLine > mMaxLine){  //进行行数的上限处理            txtLine = mMaxLine;        }        if (this.isPassword){   //密码符的转义            for (int i=0; i<txt.length; i++){                txt[i] = '*';            }        }        if (mHeight == 0){      //获取最初控件的高度            mHeight = this.getHeight();        }        float width = this.getWidth();        float height = mHeight * txtLine;        ViewGroup.LayoutParams params = this.getLayoutParams();        params.height = (int)height;        this.setLayoutParams(params);       //动态设置控件高度        float per = width / (mMaxLength+1);         //宽度等分        float perHeight = height / (txtLine + 1);    //高度等分        Paint countPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);        countPaint.setColor(mColorId);        countPaint.setTextSize(this.getTextSize());        countPaint.setTypeface(this.getTypeface());        countPaint.setTextAlign(Paint.Align.CENTER);        Rect textBounds = new Rect();        String numberStr = "1";        countPaint.getTextBounds(numberStr, 0, numberStr.length(), textBounds);//get text bounds, that can get the text width and height        float textHeight = (float)(textBounds.bottom - textBounds.top);        float textWidth = (float)(textBounds.right = textBounds.left);       //计算该控件中能够显示的单一文字的高度和宽度        for (int line = 0; line < txtLine; line++) {            for (int i = 0; i < mMaxLength && txt.length > (i+line*mMaxLength); i++) {                canvas.drawText(String.valueOf(txt[i+line*mMaxLength]), (i + 1) * per - textWidth, perHeight * (line + 1) + textHeight / 2, countPaint);       //进行绘制            }        }    }    private int getLineFromCharArray(char[] txt){        int line = ((txt.length - 1) / mMaxLength) + 1;        return line;    }}