Android Open Source - Mortgage-calculator Data Activity

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From Project

Back to project page Mortgage-calculator.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.arjonasoftware.mortgagecalculator;
/*w ww . j a v  a2 s .co m*/
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Currency;
import java.util.Locale;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class DataActivity extends Activity {

  private ProgressDialog pDialog;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_data);

    final EditText editText_mortgage_capital = (EditText) findViewById(R.id.editText_mortgage_capital);
    final EditText editText_annual_interest = (EditText) findViewById(R.id.editText_annual_interest);
    final EditText editText_years = (EditText) findViewById(R.id.editText_years);
    final TextView editText_months = (TextView) findViewById(R.id.editText_months);

    editText_mortgage_capital.addTextChangedListener(TW);
    editText_annual_interest.addTextChangedListener(TW);
    editText_years.addTextChangedListener(TW);
    editText_months.addTextChangedListener(TW);

    Button button_see_amortization_tables = (Button) findViewById(R.id.button_see_amortization_tables);
    button_see_amortization_tables
        .setOnClickListener(new View.OnClickListener() {
          public void onClick(View v) {
            // Perform action on click

            String s_mortgageCapital = editText_mortgage_capital
                .getText().toString();
            String s_annualInterest = editText_annual_interest
                .getText().toString();
            String s_years = editText_years.getText().toString();
            String s_months = editText_months.getText().toString();

            if (!isEmpty(s_mortgageCapital)
                && !isEmpty(s_annualInterest)
                && !isEmpty(s_years)) {

              new Calculate().execute(s_mortgageCapital,
                  s_annualInterest, s_years, s_months);

            } else {
              Toast.makeText(
                  getApplicationContext(),
                  getResources().getString(
                      R.string.data_incorrect),
                  Toast.LENGTH_LONG).show();
            }
          }
        });

    Button button_why_important = (Button) findViewById(R.id.button_why_important);
    button_why_important.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        Intent intent = new Intent(DataActivity.this,
            ImportantActivity.class);
        startActivity(intent);
      }
    });

    Button buttonMonthPlusMinus = (Button) findViewById(R.id.buttonMonthPlusMinus);
    buttonMonthPlusMinus.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        TextView editText_months = (TextView) findViewById(R.id.editText_months);
        String s_months = editText_months.getText().toString();
        int months = Integer.parseInt(s_months);

        if (months > 0) {
          months--;
          editText_months.setText("" + months);
        }
      }
    });

    Button buttonMonthPlus = (Button) findViewById(R.id.buttonMonthPlus);
    buttonMonthPlus.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        TextView editText_months = (TextView) findViewById(R.id.editText_months);
        String s_months = editText_months.getText().toString();
        int months = Integer.parseInt(s_months);

        if (months < 11) {
          months++;
          editText_months.setText("" + months);
        }
      }
    });

  }

  public boolean isEmpty(String s) {

    if ((s.trim().length() == 0))
      return true;
    else
      return false;
  }

  private TextWatcher TW = new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before,
        int count) {

    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {

    }

    @Override
    public void afterTextChanged(Editable s) {
      EditText editText_mortgage_capital = (EditText) findViewById(R.id.editText_mortgage_capital);
      EditText editText_annual_interest = (EditText) findViewById(R.id.editText_annual_interest);
      EditText editText_years = (EditText) findViewById(R.id.editText_years);
      TextView editText_months = (TextView) findViewById(R.id.editText_months);

      String s_mortgageCapital = editText_mortgage_capital.getText()
          .toString();
      String s_annualInterest = editText_annual_interest.getText()
          .toString();
      String s_years = editText_years.getText().toString();
      String s_months = editText_months.getText().toString();

      TextView interest_bad = (TextView) findViewById(R.id.TextView_interest_bad);
      TextView monthly_fee_good = (TextView) findViewById(R.id.TextView_monthly_fee_good);
      TextView monthly_fee_bad = (TextView) findViewById(R.id.TextView_monthly_fee_bad);
      TextView payment_more = (TextView) findViewById(R.id.TextView_payment_more);
      TextView payment_more_lending = (TextView) findViewById(R.id.TextView_payment_more_lending);

      if (!isEmpty(s_mortgageCapital) && !isEmpty(s_annualInterest)
          && !isEmpty(s_years)) {
        Double mortgage_capital = Double.parseDouble(s_mortgageCapital);
        Double annual_interest = (Double.parseDouble(s_annualInterest)) / 100;
        int years = Integer.parseInt(s_years);
        int months = Integer.parseInt(s_months);

        double monthlyInterest = Math
            .pow(1 + annual_interest, 1f / 12f) - 1;
        double monthlyInterestApproximate = annual_interest / 12;
        double anualInterestApproximate = Math.pow(
            1 + monthlyInterestApproximate, 12) - 1;

        double monthlyFee = (mortgage_capital * monthlyInterest)
            / (1 - 1 / Math.pow(1f + monthlyInterest, 12f * years
                + months));

        double monthlyFeeApproximate = (mortgage_capital * monthlyInterestApproximate)
            / (1 - 1 / Math.pow(1f + monthlyInterestApproximate,
                12f * years + months));

        DecimalFormat df2 = new DecimalFormat("0.00");
        DecimalFormat df3 = new DecimalFormat("0.000");

        Currency currency = Currency.getInstance(Locale.getDefault());
        String symbolCurrency = currency.getSymbol();

        interest_bad
            .setText(getResources()
                .getString(R.string.interest_bad)
                + " "
                + df3.format(anualInterestApproximate * 100)
                + "%"
                + " "
                + getResources().getString(R.string.annual));

        monthly_fee_good.setText(getResources().getString(
            R.string.monthly_fee_good)
            + " "
            + df2.format(monthlyFee)
            + " "
            + symbolCurrency
            + "/" + getResources().getString(R.string.month_minus));

        monthly_fee_bad.setText(getResources().getString(
            R.string.monthly_fee_bad)
            + " "
            + df2.format(monthlyFeeApproximate)
            + " "
            + symbolCurrency
            + "/"
            + getResources().getString(R.string.month_minus));

        double d_payment_more = (monthlyFeeApproximate - monthlyFee) * 12;

        payment_more.setText(getResources().getString(
            R.string.payment_more)
            + " " + df2.format(d_payment_more) + symbolCurrency);
        payment_more_lending.setText(getResources().getString(
            R.string.payment_more_lending)
            + " "
            + df2.format(d_payment_more * years)
            + symbolCurrency);
      } else {
        interest_bad.setText(getResources().getString(
            R.string.interest_bad));

        monthly_fee_good.setText(getResources().getString(
            R.string.monthly_fee_good));
        monthly_fee_bad.setText(getResources().getString(
            R.string.monthly_fee_bad));

        payment_more.setText(getResources().getString(
            R.string.payment_more));
        payment_more_lending.setText(getResources().getString(
            R.string.payment_more_lending));
      }
    }

  };

  private class Calculate extends AsyncTask<String, Integer, Boolean> {

    @Override
    protected Boolean doInBackground(String... params) {
      String s_mortgageCapital = params[0];
      String s_annualInterest = params[1];
      String s_years = params[2];
      String s_months = params[3];

      float mortgageCapital = Float.parseFloat(s_mortgageCapital);
      float annualInterest = (Float.parseFloat(s_annualInterest)) / 100;
      int years = Integer.parseInt(s_years);
      int months = Integer.parseInt(s_months);

      double monthlyInterest = Math.pow(1 + annualInterest, 1f / 12f) - 1;
      double monthlyFee = (mortgageCapital * monthlyInterest)
          / (1 - 1 / Math.pow(1f + monthlyInterest, 12f * years
              + months));

      double monthlyInterestApproximate = annualInterest / 12;
      double monthlyFeeApproximate = (mortgageCapital * monthlyInterestApproximate)
          / (1 - 1 / Math.pow(1f + monthlyInterestApproximate, 12f
              * years + months));

      ArrayList<String> rowMonth = new ArrayList<String>();
      ArrayList<String> rowDebt = new ArrayList<String>();
      ArrayList<String> rowAmortization = new ArrayList<String>();
      ArrayList<String> rowInterests = new ArrayList<String>();
      double interestsCount = 0;

      ArrayList<String> rowDebtApproximate = new ArrayList<String>();
      ArrayList<String> rowAmortizationApproximate = new ArrayList<String>();
      ArrayList<String> rowInterestsApproximate = new ArrayList<String>();
      double interestsCountApproximate = 0;

      DecimalFormat df2 = new DecimalFormat("0.00");

      double DRowInterests, DRowInterests2;
      double DRowAmortization, DRowAmortization2;
      double DRowDebt = mortgageCapital, DRowDebt2 = mortgageCapital;

      int tenPercentProgressBar = (12 * years) / 10;
      int progressBar = 0;
      int progressBarIterations = tenPercentProgressBar;
      for (int i = 1; i <= 12 * years + months; i++) {
        rowMonth.add("" + i);

        // CORRECT
        DRowInterests = DRowDebt * monthlyInterest;
        interestsCount = interestsCount + DRowInterests;

        DRowAmortization = monthlyFee - DRowInterests;

        DRowDebt = DRowDebt - DRowAmortization;

        rowDebt.add(df2.format(DRowDebt));
        rowAmortization.add(df2.format(DRowAmortization));
        rowInterests.add(df2.format(DRowInterests));

        // APPROXIMATE
        DRowInterests2 = DRowDebt2 * monthlyInterestApproximate;
        interestsCountApproximate = interestsCountApproximate
            + DRowInterests2;

        DRowAmortization2 = monthlyFeeApproximate - DRowInterests2;

        DRowDebt2 = DRowDebt2 - DRowAmortization2;

        rowDebtApproximate.add(df2.format(DRowDebt2));
        rowAmortizationApproximate.add(df2.format(DRowAmortization2));
        rowInterestsApproximate.add(df2.format(DRowInterests2));

        if (i == progressBarIterations) {
          progressBar += 10;
          progressBarIterations += tenPercentProgressBar;
          publishProgress(progressBar);
        }
      }

      Currency currency = Currency.getInstance(Locale.getDefault());
      String symbolCurrency = currency.getSymbol();

      rowMonth.add("");
      rowDebt.add("");
      rowDebtApproximate.add("");
      rowAmortization
          .add(getResources().getString(R.string.amount) + "\n"
              + df2.format(mortgageCapital) + " "
              + symbolCurrency);
      rowAmortizationApproximate
          .add(getResources().getString(R.string.amount) + "\n"
              + df2.format(mortgageCapital) + " "
              + symbolCurrency);

      rowInterests.add(getResources().getString(R.string.amount) + "\n"
          + df2.format(interestsCount) + " " + symbolCurrency);
      rowInterestsApproximate.add(getResources().getString(
          R.string.amount)
          + "\n"
          + df2.format(interestsCountApproximate)
          + " "
          + symbolCurrency);

      MyApplication myApplication = (MyApplication) getApplicationContext();

      myApplication.setRowMonth(rowMonth);
      myApplication.setRowDebt(rowDebt);
      myApplication.setRowDebtApproximate(rowDebtApproximate);

      myApplication.setRowAmortization(rowAmortization);
      myApplication
          .setRowAmortizationApproximate(rowAmortizationApproximate);

      myApplication.setRowInterests(rowInterests);
      myApplication.setRowInterestsApproximate(rowInterestsApproximate);

      return true;
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
      int progreso = values[0].intValue();

      pDialog.setProgress(progreso);
    }

    @Override
    protected void onPreExecute() {
      pDialog = new ProgressDialog(DataActivity.this);
      pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
      pDialog.setMessage(getResources().getString(R.string.calculating));
      pDialog.setCancelable(true);
      pDialog.setProgress(0);
      pDialog.show();
      pDialog.setOnCancelListener(new OnCancelListener() {
        @Override
        public void onCancel(DialogInterface dialog) {
          cancel(true);
        }
      });
    }

    @Override
    protected void onPostExecute(Boolean b) {
      if (pDialog.isShowing())
        pDialog.dismiss();

      Intent intent = new Intent(DataActivity.this, ResultActivity.class);
      startActivity(intent);
    }

    @Override
    protected void onCancelled() {
      if (pDialog.isShowing())
        pDialog.dismiss();
      Toast.makeText(DataActivity.this, "Cancelado", Toast.LENGTH_LONG)
          .show();
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      NavUtils.navigateUpFromSameTask(this);
      return true;
    case R.id.action_important:
      Intent intent = new Intent(DataActivity.this,
          ImportantActivity.class);
      startActivity(intent);
      return true;
    case R.id.action_share:
      Intent sharingIntent = new Intent(Intent.ACTION_SEND);
      sharingIntent.setType("text/plain");
      sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT,
          getResources().getString(R.string.share_text));
      startActivity(Intent.createChooser(sharingIntent, getResources()
          .getString(R.string.share_via)));
      return true;

    }
    return super.onOptionsItemSelected(item);
  }

}

Java Source Code List

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