仿支付宝的密码均分输入框

仿支付宝的密码均分输入框

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;
}
}