What is the error that you get?
On Thu, Apr 14, 2011 at 2:06 AM, Jester <[email protected]> wrote:
> 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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