Android Open Source - sample_testing Main Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.elsinga.calculator;
//from   w ww. j a  va2s .  c om
import java.util.Vector;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity
{
  private EditText            editText            = null;

  private NumBtnClickListener numBtnClickListener = null;

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

    numBtnClickListener = new NumBtnClickListener();
    editText = (EditText) findViewById(R.id.editText1);

    initBtn();

  }

  private void initBtn()
  {
    findViewById(R.id.num_0).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_1).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_2).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_3).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_4).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_5).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_6).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_7).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_8).setOnClickListener(numBtnClickListener);
    findViewById(R.id.num_9).setOnClickListener(numBtnClickListener);

    findViewById(R.id.point).setOnClickListener(numBtnClickListener);
    findViewById(R.id.op_add).setOnClickListener(numBtnClickListener);
    findViewById(R.id.op_div).setOnClickListener(numBtnClickListener);
    findViewById(R.id.op_mul).setOnClickListener(numBtnClickListener);
    findViewById(R.id.op_sub).setOnClickListener(numBtnClickListener);

    findViewById(R.id.op_equ).setOnClickListener(new EqualBtnClickListener());

    findViewById(R.id.clear).setOnClickListener(new ClearBtnClickListener());

  }

  public class NumBtnClickListener implements OnClickListener
  {

    @Override
    public void onClick(View v)
    {
      Button btn = (Button) v;
      String string = editText.getText().toString() + btn.getText().toString();
      editText.setText(string);
      editText.setSelection(string.length());
    }
  }

  public class ClearBtnClickListener implements OnClickListener
  {

    @Override
    public void onClick(View v)
    {
      editText.getText().clear();
    }
  }

  public class EqualBtnClickListener implements OnClickListener
  {

    @Override
    public void onClick(View v)
    {
      String string = editText.getText().toString();

      if (string.equals(""))
      {
        Toast.makeText(MainActivity.this, "No value given", Toast.LENGTH_LONG).show();
        return;
      }
      Double result = calculate(string);

      String resultString = "";
      if (result % 1.0 == 0.0)
      {
        resultString = result.longValue() + "";
      }
      else
      {
        resultString = result + "";
      }
      editText.setText(resultString);
      editText.setSelection(resultString.length());
    }

  }

  private Double calculate(String calcString)
  {
    String[] numberStrings = calcString.split("[\\+\\-\\\\]");

    Vector<String> operators = new Vector<String>();
    Vector<Double> numbersVector = new Vector<Double>();
    for (String string : numberStrings)
    {
      numbersVector.add(Double.parseDouble(string));
    }

    for (char object : calcString.toCharArray())
    {
      if (object == '+' || object == '-' || object == '' || object == '')
      {
        operators.add(Character.toString(object));
      }
    }

    for (int i = 0; i < operators.size(); i++)
    {
      if (operators.get(i).equals(""))
      {
        numbersVector.set(i, numbersVector.get(i) * numbersVector.get(i + 1));
        numbersVector.remove(i + 1);
        operators.remove(i);
        i--;
      }
      else if (operators.get(i).equals(""))
      {
        numbersVector.set(i, numbersVector.get(i) / numbersVector.get(i + 1));
        numbersVector.remove(i + 1);
        operators.remove(i);
        i--;
      }

    }

    for (int i = 0; i < operators.size(); i++)
    {
      if (operators.get(i).equals("+"))
      {
        numbersVector.set(i, numbersVector.get(i) + numbersVector.get(i + 1));
        numbersVector.remove(i + 1);
        operators.remove(i);
        i--;
      }

      else if (operators.get(i).equals("-"))
      {
        numbersVector.set(i, numbersVector.get(i) - numbersVector.get(i + 1));
        numbersVector.remove(i + 1);
        operators.remove(i);
        i--;
      }
    }
    return numbersVector.get(0);
  }
}

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