How to implement Age Calculator Layout and Coding in Android.

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MainActivity.java

package com.example.agecalculatorapp;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
private Button btnStart;
static final int DATE_START_DIALOG_ID = 0;
private int startYear=1970;
private int startMonth=6;
private int startDay=15;
private AgeCalculation age = null;
private TextView currentDate;
private TextView birthDate;
private TextView result;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
age=new AgeCalculation();
currentDate=(TextView) findViewById(R.id.textView1);
currentDate.setText("Current Date(DD/MM/YY) : "+age.getCurrentDate());
birthDate=(TextView) findViewById(R.id.textView2);
result=(TextView) findViewById(R.id.textView3);
btnStart=(Button) findViewById(R.id.button1);
btnStart.setOnClickListener(this);

}

@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_START_DIALOG_ID:
return new DatePickerDialog(this,
mDateSetListener,
startYear, startMonth, startDay);
}
return null;
}

private DatePickerDialog.OnDateSetListener mDateSetListener
= new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
startYear=selectedYear;
startMonth=selectedMonth;
startDay=selectedDay;
age.setDateOfBirth(startYear, startMonth, startDay);
birthDate.setText("Date of Birth(DD/MM/YY): "+selectedDay+":"+(startMonth+1)+":"+startYear);
calculateAge();
}
};
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.button1:
showDialog(DATE_START_DIALOG_ID);
break;

default:
break;
}
}
private void calculateAge()
{
age.calcualteYear();
age.calcualteMonth();
age.calcualteDay();
Toast.makeText(getBaseContext(), "click the resulted button"+age.getResult() , Toast.LENGTH_SHORT).show();
result.setText("AGE (DD/MM/YY) :"+age.getResult());
}

}

AgeCalculation.java

package com.example.agecalculatorapp;

import java.util.Calendar;

public class AgeCalculation {

private int startYear;
private int startMonth;
private int startDay;
private int endYear;
private int endMonth;
private int endDay;
private int resYear;
private int resMonth;
private int resDay;
private Calendar start;
private Calendar end;
public String getCurrentDate()
{
end=Calendar.getInstance();
endYear=end.get(Calendar.YEAR);
endMonth=end.get(Calendar.MONTH);
endMonth++;
endDay=end.get(Calendar.DAY_OF_MONTH);
return endDay+":"+endMonth+":"+endYear;
}
public void setDateOfBirth(int sYear, int sMonth, int sDay)
{
startYear=sYear;
startMonth=sMonth;
startMonth++;
startDay=sDay;

}
public void calcualteYear()
{
resYear=endYear-startYear;

}

public void calcualteMonth()
{
if(endMonth>=startMonth)
{
resMonth= endMonth-startMonth;
}
else
{
resMonth=endMonth-startMonth;
resMonth=12+resMonth;
resYear--;
}

}
public void calcualteDay()
{

if(endDay>=startDay)
{
resDay= endDay-startDay;
}
else
{
resDay=endDay-startDay;
resDay=30+resDay;
if(resMonth==0)
{
resMonth=11;
resYear--;
}
else
{
resMonth--;
}

}
}

public String getResult()
{
return resDay+":"+resMonth+":"+resYear;
}
public long getSeconde()
{
start=Calendar.getInstance();
start.set(Calendar.YEAR, startYear);
start.set(Calendar.MONTH, startMonth);
start.set(Calendar.DAY_OF_MONTH, startDay);
start.set(Calendar.HOUR, 12);
start.set(Calendar.MINUTE, 30);
start.set(Calendar.SECOND, 30);
start.set(Calendar.MILLISECOND, 30);
long now=end.getTimeInMillis();
long old=start.getTimeInMillis();
long diff=old-now;
return diff/1000;
}
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:gravity="center"

android:background="#ffff00"

android:layout_height="match_parent"

android:orientation="vertical" >

<ImageView

android:id="@+id/imageView1"

android:layout_width="100dp"

android:layout_height="100dp"

android:src="@drawable/ic_launcher" />

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Current Date"

android:textSize="30dp" />

<TextView

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Birth Date"

android:textSize="30dp" />

<TextView

android:id="@+id/textView3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Result"

android:textSize="30dp" />

<Button

android:id="@+id/button1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="10dp"

android:layout_marginRight="10dp"

android:textSize="30dp"

android:text="Date of Birth" />

<ImageView

android:id="@+id/imageView2"

android:layout_width="match_parent"

android:layout_height="100dp"

android:scaleType="fitXY"

android:src="@drawable/design" />

</LinearLayout>

manifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.agecalculatorapp"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="15" />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MainActivity"

android:label="@string/title_activity_main" >

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

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