Android 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：

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; }}

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