本文实例为大家分享了android实现房贷计算器的具体代码，供大家参考，具体内容如下
fangdai（activity）
package com.example.myapplication_one;
import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.text.editable;
import android.text.textutils;
import android.text.textwatcher;
import android.view.view;
import android.widget.arrayadapter;
import android.widget.button;
import android.widget.checkbox;
import android.widget.edittext;
import android.widget.radiogroup;
import android.widget.spinner;
import android.widget.textview;
import android.widget.toast;
public class fangdai extends appcompatactivity {
//声明用到的所有控件
spinner spinner1;
spinner spinner2;
edittext row1edit;
edittext row2edit;
button total;
radiogroup radiogroup;
checkbox checkbox1;
checkbox checkbox2;
edittext row4edit;
edittext row5edit;
button detail;
textview totalcal;
textview alldetail;
private void initspinner(){
//初始化控件
spinner1= (spinner) findviewbyid(r.id.sp1);
spinner2= (spinner) findviewbyid(r.id.sp2);
//建立数据源
string[] years=getresources().getstringarray(r.array.years);
string[] baserates=getresources().getstringarray(r.array.baserate);
//声明一个下拉列表的数组适配器并绑定数据源
arrayadapter<string> yearadapter=new arrayadapter<string>(this,r.layout.support_simple_spinner_dropdown_item,years);
arrayadapter<string> baserateadapter=new arrayadapter<string>(this,r.layout.support_simple_spinner_dropdown_item,baserates);
//绑定adapter到控件
spinner1.setadapter(yearadapter);
spinner2.setadapter(baserateadapter);
//设置默认选择第一项
spinner1.setselection(0);
spinner2.setselection(0);
//设置标题
spinner1.setprompt("请选择贷款年限");
spinner2.setprompt("请选择基准利率");
}
//声明下列函数中要用到的变量
double intotal,backtotal,extra,pertime;//贷款总额，还款总额，利息，每月还款总额
int month;//月份
string buytotal;//购房总额
string percent;//贷款百分比
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.fangdai);
//初始化控件
initspinner();
row1edit= (edittext) findviewbyid(r.id.row1edit);
row2edit= (edittext) findviewbyid(r.id.row2edit);
total= (button) findviewbyid(r.id.totalcal);
radiogroup= (radiogroup) findviewbyid(r.id.radiogroup);
checkbox1= (checkbox) findviewbyid(r.id.check1);
checkbox2= (checkbox) findviewbyid(r.id.check2);
totalcal= (textview) findviewbyid(r.id.showtotal);
detail= (button) findviewbyid(r.id.detail);
alldetail= (textview) findviewbyid(r.id.alldetail);
row4edit= (edittext) findviewbyid(r.id.row4label);
row5edit= (edittext) findviewbyid(r.id.row5label);
//给第一个计算按钮添加点击监听
total.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view view) {
buytotal=row1edit.gettext().tostring();
percent=row2edit.gettext().tostring();
if(textutils.isempty(buytotal)||textutils.isempty(percent))//判断前两个输入框是否非空
{
toast.maketext(fangdai.this,"购房总价和按揭部分信息填写完整",toast.length_long).show();
}else if(fangdaitext.isnum(buytotal)==false||fangdaitext.isnum(percent)==false){//判断输入的是否是数字
toast.maketext(fangdai.this,"包含不合法的输入信息",toast.length_long).show();
} else if(double.parsedouble(percent)>100){//判断百分比部分输入是否大于100%
toast.maketext(fangdai.this,"按揭部分不能超过100%",toast.length_long).show();
} else if(fangdaitext.isnum(buytotal)&&fangdaitext.isnum(percent))
{
intotal=(double.parsedouble(buytotal)*double.parsedouble(percent)*0.01);
totalcal.settext("您的贷款总额为"+string.format("%.2f",intotal)+"万元");
}
}
});
detail.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view view) {
//first,second为商贷和公积金贷所填数值
string first=row4edit.gettext().tostring();
string second=row5edit.gettext().tostring();
//firstrate和secondrate为商贷和公积金的年利率
double firstrate=double.parsedouble(spinner2.getselecteditem().tostring().substring(20,24))*0.01;
double secondrate=double.parsedouble(spinner2.getselecteditem().tostring().substring(31,35))*0.01;
//获取下拉列表的年份求得月份
string year=spinner1.getselecteditem().tostring();
month=integer.parseint(year.substring(0,year.length()-1))*12;
//两种贷款的月利率
double firstmonthrate=firstrate/12;
double secondmonthrate=secondrate/12;
if(totalcal.gettext().tostring().equals("其中贷款部分为：***万")){//判断是否计算过贷款总额
toast.maketext(fangdai.this,"请先计算贷款总额",toast.length_long).show();
}else if(row1edit.gettext().tostring().equals(buytotal)==false||row2edit.gettext().tostring().equals(percent)==false){//监听贷款总额和按揭部分数值是否发生变化
toast.maketext(fangdai.this,"检查到您的购房总价或按揭部分数据更改，请重新计算贷款总额",toast.length_long).show();
} else if(checkbox1.ischecked()==false&&checkbox2.ischecked()==false)//监听勾选的多选框
{
toast.maketext(fangdai.this,"请勾选贷款种类",toast.length_long).show();
}else if(checkbox1.ischecked()&&checkbox2.ischecked()==false){
//等额本息贷款算法
if(radiogroup.getcheckedradiobuttonid()==r.id.btn1){
pertime=intotal*firstmonthrate*math.pow((1+firstmonthrate),month)/(math.pow(1+firstmonthrate,month)-1);
backtotal=pertime*month;
extra=backtotal-intotal;
alldetail.settext("您的贷款总额为"+string.format("%.2f",intotal)+"万元\n还款总额为"+string.format("%.2f",backtotal)+"万元\n其中利息总额为"+string.format("%.2f",extra)+"万元\n还款总时间为"+month+"月\n每月还款金额为"+string.format("%.2f",pertime*10000)+"元");
}else{//等额本金贷款算法
double[] array=new double[month];
double sum=0;
for(int i=0;i<month;i++)
{
array[i]=intotal/month+(intotal-sum)*firstmonthrate;
sum+=array[i];
}
string text="";
for(int i=0;i<month;i++){
text+="\n第"+(i+1)+"个月应还金额为："+string.format("%.2f",array[i]*10000);
}
backtotal=sum;
extra=backtotal-intotal;
alldetail.settext("您的贷款总额为"+string.format("%.2f",intotal)+"万元\n还款总额为"+string.format("%.2f",backtotal)+"万元\n其中利息总额为"+string.format("%.2f",extra)+"万元\n还款总时间为"+month+"月\n每月还款金额如下："+text);
}
}else if(checkbox1.ischecked()==false&&checkbox2.ischecked()){
if(radiogroup.getcheckedradiobuttonid()==r.id.btn1){
pertime=intotal*secondmonthrate*math.pow((1+secondmonthrate),month)/(math.pow(1+secondmonthrate,month)-1);
backtotal=pertime*month;
extra = backtotal - intotal;
alldetail.settext("您的贷款总额为" + string.format("%.2f",intotal) + "万元\n还款总额为"+string.format("%.2f",backtotal)+"万元\n其中利息总额为"+string.format("%.2f",extra)+"万元\n还款总时间为"+month+"月\n每月还款金额为"+string.format("%.2f",pertime*10000)+"元");
}else{
double[] array=new double[month];
double sum=0;
for(int i=0;i<month;i++)
{
array[i]=intotal/month+(intotal-sum)*secondmonthrate;
sum+=array[i];
}
string text="";
for(int i=0;i<month;i++){
text+="\n第"+(i+1)+"个月应还金额为："+string.format("%.2f",array[i]*10000)+"元";
}
backtotal=sum;
extra=backtotal-intotal;
alldetail.settext("您的贷款总额为"+string.format("%.2f",intotal)+"万元\n还款总额为"+string.format("%.2f",backtotal)+"万元\n其中利息总额为"+string.format("%.2f",extra)+"万元\n还款总时间为"+month+"月\n每月还款金额如下："+text);
}
}else if(checkbox1.ischecked()&&checkbox2.ischecked()){
if(radiogroup.getcheckedradiobuttonid()==r.id.btn1){
if(textutils.isempty(first)||textutils.isempty(second)){
toast.maketext(fangdai.this,"请将空信息填写完整",toast.length_long).show();
}else if(fangdaitext.isnum(first)==false||fangdaitext.isnum(second)==false){
toast.maketext(fangdai.this,"包含不合法的输入信息",toast.length_long).show();
}else if(double.parsedouble(first)+double.parsedouble(second)!=double.parsedouble(string.format("%.2f",intotal))){
toast.maketext(fangdai.this,"填写的两项贷款总额不等于初始贷款额度，请重新填写",toast.length_long).show();
}else{
double p1=double.parsedouble(first);
double p2=double.parsedouble(second);
double pertime1=p1*firstmonthrate*math.pow((1+firstmonthrate),month)/(math.pow(1+firstmonthrate,month)-1);
double pertime2=p2*secondmonthrate*math.pow((1+secondmonthrate),month)/(math.pow(1+secondmonthrate,month)-1);
pertime=pertime1+pertime2;
backtotal=pertime*month;
extra=backtotal-intotal;
alldetail.settext("您的贷款总额为" + string.format("%.2f",intotal) + "万元\n还款总额为"+string.format("%.2f",backtotal)+"万元\n其中利息总额为"+string.format("%.2f",extra)+"万元\n还款总时间为"+month+"月\n每月还款金额为"+string.format("%.2f",pertime*10000)+"元");
}
}else{
if(first.equals("请输入商业贷款总额（单位万）")||second.equals("请输入公积金贷款总额（单位万）")){
toast.maketext(fangdai.this,"请将空信息填写完整",toast.length_long).show();
}else if(fangdaitext.isnum(first)==false||fangdaitext.isnum(second)==false){
toast.maketext(fangdai.this,"包含不合法的输入信息",toast.length_long).show();
}else if(double.parsedouble(first)+double.parsedouble(second)!=double.parsedouble(string.format("%.2f",intotal))){
toast.maketext(fangdai.this,"填写的两项贷款总额不等于初始贷款额度，请重新填写",toast.length_long).show();
}else{
double p1=double.parsedouble(first);
double p2=double.parsedouble(second);
double[] array1=new double[month];
double[] array2=new double[month];
double sum1=0,sum2=0;
for(int i=0;i<month;i++)
{
array1[i]=p1/month+(p1-sum1)*firstmonthrate;
array2[i]=p2/month+(p2-sum2)*secondmonthrate;
toast.maketext(fangdai.this,array1[i]+" "+array2[i],toast.length_long);
sum1+=array1[i];
sum2+=array2[i];
}
string text="";
for(int i=0;i<month;i++){
text+="\n第"+(i+1)+"个月应还金额为："+string.format("%.2f",(array1[i]+array2[i])*10000)+"元";
}
backtotal=sum1+sum2;
extra=backtotal-intotal;
alldetail.settext("您的贷款总额为"+string.format("%.2f",intotal)+"万元\n还款总额为"+string.format("%.2f",backtotal)+"万元\n其中利息总额为"+string.format("%.2f",extra)+"万元\n还款总时间为"+month+"月\n每月还款金额如下："+text);
}
}
}
}
});
row1edit.addtextchangedlistener(new textwatcher() {
int oldlength=0;
@override
public void beforetextchanged(charsequence charsequence, int i, int i1, int i2) {
}
@override
public void ontextchanged(charsequence charsequence, int i, int i1, int i2) {//强制用户不能输入非数字和小数点之外的字符
int length = charsequence.length();
if (length > oldlength) {
char newchar = charsequence.charat(i);
if ((newchar < '0' && newchar > '9') && newchar != '.') {
if (i != length - 1)
row1edit.settext(charsequence.subsequence(0, i).tostring() + charsequence.subsequence(i + 1, length).tostring());
else
row1edit.settext(charsequence.subsequence(0, length - 1));
}
}
oldlength=length;
}
@override
public void aftertextchanged(editable editable) {
}
});
row2edit.addtextchangedlistener(new textwatcher() {
int oldlength=0;
@override
public void beforetextchanged(charsequence charsequence, int i, int i1, int i2) {
}
@override
public void ontextchanged(charsequence charsequence, int i, int i1, int i2) {
int length=charsequence.length();
if(length>oldlength) {
char newchar = charsequence.charat(i);
if ((newchar < '0' && newchar > '9') && newchar != '.') {
if (i != length - 1)
row2edit.settext(charsequence.subsequence(0, i).tostring() + charsequence.subsequence(i + 1, length).tostring());
else
row2edit.settext(charsequence.subsequence(0, length - 1));
}
}
oldlength=length;
}
@override
public void aftertextchanged(editable editable) {
}
});
row4edit.addtextchangedlistener(new textwatcher() {
int oldlength=0;
@override
public void beforetextchanged(charsequence charsequence, int i, int i1, int i2) {
}
@override
public void ontextchanged(charsequence charsequence, int i, int i1, int i2) {
int length=charsequence.length();
if(length>oldlength) {
char newchar = charsequence.charat(i);
if ((newchar < '0' && newchar > '9') && newchar != '.') {
if (i != length - 1)
row4edit.settext(charsequence.subsequence(0, i).tostring() + charsequence.subsequence(i + 1, length).tostring());
else
row4edit.settext(charsequence.subsequence(0, length - 1));
}
}
oldlength=length;
}
@override
public void aftertextchanged(editable editable) {
}
});
row5edit.addtextchangedlistener(new textwatcher() {
int oldlength=0;
@override
public void beforetextchanged(charsequence charsequence, int i, int i1, int i2) {
}
@override
public void ontextchanged(charsequence charsequence, int i, int i1, int i2) {
int length=charsequence.length();
if(length>oldlength) {
char newchar = charsequence.charat(i);
if ((newchar < '0' && newchar > '9') && newchar != '.') {
if (i != length - 1)
row5edit.settext(charsequence.subsequence(0, i).tostring() + charsequence.subsequence(i + 1, length).tostring());
else
row5edit.settext(charsequence.subsequence(0, length - 1));
}
}
oldlength=length;
}
@override
public void aftertextchanged(editable editable) {
}
});
}
}
fangdaitext（activity）
package com.example.myapplication_one;
public class fangdaitext {
public static boolean isnum(string string){
int flag=0;
if(string.charat(0)=='0'&&string.charat(1)!='.')
return false;
if(string.charat(0)=='.')
return false;
for(int i=0;i<string.length();i++)
{
if((string.charat(i)<'0'||string.charat(i)>'9')&&string.charat(i)!='.')
return false;
else if(string.charat(i)=='.')
{
flag++;
if(flag>1)
return false;
}
}
return true;
}
}
fangdai.xml
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="16dp" android:focusableintouchmode="true" android:focusable="true" tools:context="com.example.myapplication_one.fangdai"> <scrollview android:layout_width="match_parent" android:layout_height="wrap_content"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/relativelayout1"> <textview android:id="@+id/row1label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="购房总价：" android:layout_centervertical="true" android:textsize="18sp" /> <edittext android:id="@+id/row1edit" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centervertical="true" android:hint="请输入购房总价（单位万）" android:singleline="true" android:textsize="16dp" android:background="@drawable/edittext_style" android:padding="5dp" android:gravity="right" android:layout_torightof="@+id/row1label" android:layout_toleftof="@+id/row1endlabel" android:inputtype="numberdecimal"/> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="万" android:textsize="18sp" android:layout_marginleft="10dp" android:layout_centervertical="true" android:layout_alignparentend="true" android:id="@+id/row1endlabel" android:layout_alignparentright="true" /> </relativelayout> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/relativelayout2" android:layout_below="@+id/relativelayout1" android:layout_margintop="20dp"> <textview android:id="@+id/row2label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="按揭部分：" android:layout_centervertical="true" android:textsize="18sp" /> <edittext android:id="@+id/row2edit" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centervertical="true" android:hint="请输入按揭百分比" android:singleline="true" android:textsize="16dp" android:background="@drawable/edittext_style" android:padding="5dp" android:gravity="right" android:layout_torightof="@+id/row2label" android:layout_toleftof="@+id/row2endlabel" android:inputtype="numberdecimal"/> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" %" android:textsize="18sp" android:layout_marginleft="10dp" android:layout_centervertical="true" android:layout_alignparentend="true" android:id="@+id/row2endlabel" android:layout_alignparentright="true" /> </relativelayout> <button android:id="@+id/totalcal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/relativelayout2" android:layout_margintop="15dp" android:background="@drawable/btn_style" android:text="计算贷款总额" /> <textview android:layout_width="match_parent" android:layout_height="wrap_content" android:text="其中贷款部分为：***万" android:layout_below="@+id/totalcal" android:layout_margintop="10dp" android:textsize="16sp" android:id="@+id/showtotal"/> <relativelayout android:id="@+id/relativelayout3" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/showtotal" android:layout_margintop="10dp"> <textview android:id="@+id/row3label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="还款方式：" android:textsize="16sp" android:layout_centervertical="true"/> <radiogroup android:id="@+id/radiogroup" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_torightof="@+id/row3label" android:orientation="horizontal"> <radiobutton android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="等额本息" android:checked="true"/> <radiobutton android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="等额本金" android:layout_marginleft="10dp"/> </radiogroup> </relativelayout> <relativelayout android:id="@+id/relativelayout4" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/relativelayout3"> <checkbox android:id="@+id/check1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="商贷： "/> <edittext android:id="@+id/row4label" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centervertical="true" android:hint="请输入商业贷款总额（单位万）" android:singleline="true" android:textsize="16dp" android:background="@drawable/edittext_style" android:padding="5dp" android:gravity="right" android:layout_torightof="@+id/check1" android:layout_toleftof="@+id/row4endlabel" android:inputtype="numberdecimal"/> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="万" android:textsize="18sp" android:layout_marginleft="10dp" android:layout_centervertical="true" android:layout_alignparentend="true" android:id="@+id/row4endlabel"/> </relativelayout> <relativelayout android:id="@+id/relativelayout5" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/relativelayout4" android:layout_margintop="5dp"> <checkbox android:id="@+id/check2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="公积金："/> <edittext android:id="@+id/row5label" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centervertical="true" android:hint="请输入公积金贷款总额（单位万）" android:singleline="true" android:textsize="16dp" android:background="@drawable/edittext_style" android:padding="5dp" android:gravity="right" android:layout_torightof="@+id/check2" android:layout_toleftof="@+id/row5endlabel" android:inputtype="numberdecimal"/> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="万" android:textsize="18sp" android:layout_marginleft="10dp" android:layout_centervertical="true" android:layout_alignparentend="true" android:id="@+id/row5endlabel" /> </relativelayout> <relativelayout android:id="@+id/relativelayout6" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/relativelayout5" android:layout_margintop="10dp"> <textview android:id="@+id/row6label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="贷款年限：" android:textsize="16sp" android:layout_centervertical="true"/> <spinner android:id="@+id/sp1" android:layout_centervertical="true" android:layout_width="match_parent" android:layout_height="wrap_content" android:spinnermode="dialog" android:layout_torightof="@+id/row6label"> </spinner> </relativelayout> <relativelayout android:id="@+id/relativelayout7" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/relativelayout6" android:layout_margintop="10dp"> <textview android:id="@+id/row7label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="基准利率：" android:layout_centervertical="true" android:textsize="16sp"/> <spinner android:id="@+id/sp2" android:layout_width="match_parent" android:layout_height="wrap_content" android:spinnermode="dialog" android:layout_centervertical="true" android:layout_torightof="@+id/row7label"> </spinner> </relativelayout> <button android:id="@+id/detail" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/relativelayout7" android:layout_margintop="15dp" android:background="@drawable/btn_style" android:text="计算还款明细"/> <textview android:layout_width="match_parent" android:layout_height="wrap_content" android:text="还款总额为：***万\n其中利息总额为：***万\n月供（每月还款额）为：***" android:layout_below="@+id/detail" android:layout_margintop="10dp" android:textsize="16sp" android:id="@+id/alldetail"/> </relativelayout> </scrollview> </relativelayout>
edittext_style.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_focused="true"> <shape> <corners android:radius="5dp"/> <stroke android:width="1dp" android:color="#00ddff"/> </shape> </item> <item android:state_focused="false"> <shape> <corners android:radius="5dp"/> <stroke android:width="1dp" android:color="#000000"/> </shape> </item> </selector>
btn_style.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"> <shape> <solid android:color="#808080"/> <corners android:radius="2dp"/> <stroke android:width="1dp" android:color="@color/teal_200"/> </shape> </item> <item android:state_pressed="false"> <shape> <solid android:color="#33e3f3"/> <corners android:radius="2dp"/> <stroke android:width="1dp" android:color="#07ac78"/> </shape> </item> </selector>
dimens.xml
<resources> <!-- default screen margins, per the android design guidelines. --> <dimen name="activity_horizontal_margin">16dp</dimen> <dimen name="activity_vertical_margin">16dp</dimen> </resources>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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