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：
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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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