Hello all!
I'm starting out and new to the development of android applications
and also new to the java programming. I'm trying to make a app that
will allow me to calculate a loan but I am running into some trouble
and need assistance. Having virtually 0 experience with java I
researched java code that I could use but it did not seem to convert,
I have went through and tried to changed most the of the what I
thought needed to be changed but eclipse does not seem to recognize
what a "parseDouble" is. How can I make this code work? below is the
code that i have in my main java file:
package com.android.loancalc;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import com.project.calculator.R;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class main extends Activity
{
double principal; // original principal
double intRate; // interest rate
double numYears; // length of loan in years
final int payPerYear = 12;
NumberFormat nf;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final DecimalFormat df = new DecimalFormat ("#,###.##");
final TextView txtAnswer =
(TextView) findViewById(R.id.txt_payments);
Button btCal = (Button) findViewById(R.id.bt_calc);
btCal.setOnClickListener(new View.OnClickListener()
{
public void onClick(View arg0)
{
double result = 0.0;
TextView amountStr = (TextView)
findViewById(R.id.txt_pricipal);
TextView periodStr = (TextView)
findViewById(R.id.txt_years);
TextView rateStr = (TextView)
findViewById(R.id.txt_interest);
try {
if (amountStr.length() != 0 &&
periodStr.length() != 0
&& rateStr.length() != 0) {
principal =
Double.parseDouble(amountStr);
numYears =
Double.parseDouble(periodStr);
intRate =
Double.parseDouble(rateStr) / 100;
result = compute();
txtAnswer.setText(nf.format(result));
}
}
catch (NumberFormatException exc)
{
txtAnswer.setText("Opps");
Log.v("myApp",exc.toString());
}
}
double compute()
{
double numer;
double denom;
double b, e;
numer = intRate * principal / payPerYear;
e = -(payPerYear * numYears);
b = (intRate / payPerYear) + 1.0;
denom = 1.0 - Math.pow(b, e);
return numer / denom;
}
});
}
}
Thanks for the help!
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