Android如何实现房贷计算器
今天小编给大家分享一下Android如何实现房贷计算器的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
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>
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