Android Age Calculator

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;
public String getCurrentDate()
{
Calendar c=Calendar.getInstance();
endYear=c.get(Calendar.YEAR);
endMonth=c.get(Calendar.MONTH);
endMonth++;
endDay=c.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;
//resMonth–;
}
}

public String getResult()
{
return resDay+”:”+resMonth+”:”+resYear;
}

}

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( 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(“”+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.getResult());
}
}

<br /> <relativelayout xmlns:andro xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"></p> <p><button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:text="Date Of Birth" /></p> <p><textView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/button1" android:layout_marginTop="23dp" android:text="Current Date" /></p> <p><textView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/textView1" android:layout_marginTop="18dp" android:text="Birth Date" /></p> <p><textView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/textView2" android:layout_marginTop="16dp" android:text="Result" /></p> <p></relativeLayout></p> <p>