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1 change: 1 addition & 0 deletions app/build.gradle
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Expand Up @@ -20,5 +20,6 @@ android {
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'net.objecthunter:exp4j:0.4.4'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
}
246 changes: 246 additions & 0 deletions app/src/main/java/pk/edu/pucit/calculator/MainActivity.java
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Expand Up @@ -2,12 +2,258 @@

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import net.objecthunter.exp4j.Expression;
import net.objecthunter.exp4j.ExpressionBuilder;


public class MainActivity extends AppCompatActivity {


TextView res,eq;
Button one,two,three,four,five,six,seven,eight,nine,zero,doubleZero,ac,del,add,sub,mul,div,mod,fract,equal;
private final char ADDITION='+';
private final char SUBTRACTION='-';
private final char MULTIPLICATION='*';
private final char FRACTION='.';
private final char MODE='%';
private final char DIVIDE='/';
private double num1 = Double.NaN;
private double num2;
String s;
Expression expression;

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupVariables();


//SETTING ONCLICK LISTENERS
one.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "1");
}
});
two.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "2");
}
});
three.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "3");
}
});
four.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "4");
}
});
five.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "5");
}
});
six.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "6");
}
});
seven.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "7");
}
});
eight.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "8");
}
});
nine.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "9");
}
});
zero.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "0");
}
});
doubleZero.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText(eq.getText().toString() + "00");
}
});
ac.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
eq.setText("");
res.setText("");
}
});
del.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {


}
});
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!eq.getText().toString().endsWith("+"))
{
eq.setText(eq.getText().toString()+ADDITION);
}
}
});
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!eq.getText().toString().endsWith("-"))
{
eq.setText(eq.getText().toString()+SUBTRACTION);
}
}
});
mul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!eq.getText().toString().endsWith("*"))
{
eq.setText(eq.getText().toString()+MULTIPLICATION);
}
}
});
div.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!eq.getText().toString().endsWith("/"))
{
eq.setText(eq.getText().toString()+DIVIDE);
}
}
});
fract.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String testStr = eq.getText().toString();
int numOfDecimals = 0;

for(int i = testStr.length()-1;i>=0;i--)
{
if(isOperator(testStr.charAt(i)))
{
i=0;
}
else if(testStr.charAt(i)=='.')
{
numOfDecimals++;
}
if(numOfDecimals>1)
i=0;
}


if(!eq.getText().toString().endsWith(".") && !eq.getText().toString().endsWith("+") &&
!eq.getText().toString().endsWith("-") && !eq.getText().toString().endsWith("*") &&
!eq.getText().toString().endsWith("/") && !eq.getText().toString().endsWith("%") &&
numOfDecimals<1 )
{
eq.setText(eq.getText().toString()+FRACTION);
}
}
});
mod.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!eq.getText().toString().endsWith("%"))
{
eq.setText(eq.getText().toString()+MODE);
}
}
});
equal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String testStr = "";
while(eq.getText().toString().endsWith("+") || eq.getText().toString().endsWith("-")|| eq.getText().toString().endsWith("*") || eq.getText().toString().endsWith("/") || eq.getText().toString().endsWith("%"))
{
testStr = eq.getText().toString();
testStr = testStr.substring(0,testStr.length()-1);
eq.setText(testStr);
}
if(!eq.getText().toString().equals(""))
{
expression = new ExpressionBuilder(eq.getText().toString()).build();
try {
// Calculate the result and display
double result = expression.evaluate();
res.setText(Double.toString(result));
} catch (ArithmeticException ex) {
// Display an error message
res.setText("Error");
}
}



}
});

}
private Boolean isOperator(char ch)
{
if(ch=='+' || ch=='-' || ch=='*' || ch=='/' || ch=='%')
{
return true;
}
return false;
}
private void setupVariables()
{
//RESULTS
res =(TextView) findViewById(R.id.tv_result);
eq = (TextView) findViewById(R.id.tv_equation);

//NUMERICS
one = (Button) findViewById(R.id.one);
two = (Button) findViewById(R.id.two);
three = (Button) findViewById(R.id.three);
four = (Button) findViewById(R.id.four);
five = (Button) findViewById(R.id.five);
six = (Button) findViewById(R.id.six);
seven = (Button) findViewById(R.id.seven);
eight = (Button) findViewById(R.id.eight);
nine = (Button) findViewById(R.id.nine);
zero = (Button) findViewById(R.id.zero);
doubleZero = (Button) findViewById(R.id.doublezero);

//OPERATIONS
add = (Button) findViewById(R.id.sum);
sub = (Button) findViewById(R.id.subtract);
mul = (Button) findViewById(R.id.multiply);
div = (Button) findViewById(R.id.divide);
mod = (Button) findViewById(R.id.mod);
ac = (Button) findViewById(R.id.ac);
del = (Button) findViewById(R.id.del);
fract = (Button) findViewById(R.id.decimal);
equal = (Button) findViewById(R.id.equal);
}
}
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