Android 实现仿支付宝的密码均分输入框

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;


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 (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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