Android Open Source - Power-Calculator Calculator

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From Project

Back to project page Power-Calculator.

License

The source code is released under:

MIT License

Java Source Code

package org.sumitbisht;
//w  ww. j  a  v  a2 s  .  c o  m
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Calculator extends Activity {
  Button btn;
  Button billFinder;
  EditText billCost;
  EditText unitCount;
  EditText meterRent;
  TextView unitCost;
  EditText user1Reading;
  EditText user2Reading;
  EditText user3Reading;
  TextView user1Bill;
  TextView user2Bill;
  TextView user3Bill;
  
    /** Called when the activity is first created. */
  //  @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn = (Button) findViewById(R.id.costperunitbtn);
        billCost = (EditText) findViewById(R.id.editText);
        unitCount = (EditText) findViewById(R.id.editText1);
        meterRent = (EditText) findViewById(R.id.editText2);
        unitCost = (TextView) findViewById(R.id.unitcost);
        billFinder = (Button) findViewById(R.id.mainBillButton);

        user1Reading = (EditText) findViewById(R.id.usr1Reading);
        user2Reading = (EditText) findViewById(R.id.usr2Reading);
        user3Reading = (EditText) findViewById(R.id.usr3Reading);
        user1Bill = (TextView) findViewById(R.id.Usr1Bill);
        user2Bill = (TextView) findViewById(R.id.Usr2Bill);
        user3Bill = (TextView) findViewById(R.id.Usr3Bill);
        
        btn.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View arg0) {
        unitPrice();
      }
    });
        billFinder.setOnClickListener( new View.OnClickListener() {
      
      @Override
      public void onClick(View arg0) {
        perPersonBill();
        
      }
    });
     //Following properties exist to set the value of the fields to null on focus.
     //TODO : write the code here!
    }
    
    /**
     * Finds out the price of a single unit of electricity.
     * Uses the total number of units consumed and the total price of the electricity bill.
     * It then deducts the fixed meter rent as specified as this is not directly counted under the unit price,
     * but is distributed evenly.
     */
  private void unitPrice() {
    try{
      double billedCost = Double.parseDouble(billCost.getText().toString());
      double unitsCnt = Double.parseDouble(unitCount.getText().toString());
      double rent = Double.parseDouble(meterRent.getText().toString());
    
      billedCost = (billedCost-rent)/unitsCnt;
      unitCost.setText("Rs. "+billedCost+"/-");
      perPersonBill();
    }catch(Exception ex){
      unitCost.setText("error computing values.");
    }
  }
  private void perPersonBill(){
    try {
      double totalBill = Double.parseDouble(billCost.getText().toString());
      double rent = Double.parseDouble(meterRent.getText().toString());
      double unitsCnt = Double.parseDouble(unitCount.getText().toString());
      double perUnitCost = (totalBill - rent) / unitsCnt;
      
      double usr1Reading = Double.parseDouble(user1Reading.getText().toString());
      double usr2Reading = Double.parseDouble(user2Reading.getText().toString());
      
      double remainingReading = unitsCnt-usr1Reading-usr2Reading;
      user3Reading.setText(""+(int)remainingReading);
      rent /=3;
      usr1Reading = usr1Reading * perUnitCost + rent;
      usr2Reading = usr2Reading * perUnitCost + rent;
      remainingReading = remainingReading * perUnitCost + rent;
      user1Bill.setText("Rs."+(int)usr1Reading+"/-");
      user2Bill.setText("Rs."+(int)usr2Reading+"/-");
      user3Bill.setText("Rs."+(int)remainingReading+"/-");
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }
}

Java Source Code List

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