Calculator/MainActivity at main · ArhaanX/Calculator · GitHub

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package com.example.calcx;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;


public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    TextView data, output;
    Button clear, bracketL, bracketR;
    Button division, multiplication, subtraction, addition, equal;
    Button number0, number1, number2, number3, number4, number5, number6, number7, number8, number9;
    Button AC, decimal;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        data = findViewById(R.id.data);
        output = findViewById(R.id.output);

        assignId(clear, R.id.clear);
        assignId(bracketL, R.id.bracketL);
        assignId(bracketR, R.id.bracketR);
        assignId(division, R.id.division);
        assignId(multiplication, R.id.multiplication);
        assignId(subtraction, R.id.subtraction);
        assignId(addition, R.id.addition);
        assignId(number0, R.id.number0);
        assignId(number1, R.id.number1);
        assignId(number2, R.id.number2);
        assignId(number3, R.id.number3);
        assignId(number4, R.id.number4);
        assignId(number5, R.id.number5);
        assignId(number6, R.id.number6);
        assignId(number7, R.id.number7);
        assignId(number8, R.id.number8);
        assignId(number9, R.id.number9);
        assignId(equal, R.id.equal);
        assignId(AC, R.id.AC);
        assignId(decimal, R.id.decimal);


    }
    void assignId(Button btn, int id){
        btn = findViewById(id);
        btn.setOnClickListener(this);

    }


    @SuppressLint("SetTextI18n")
    @Override
    public void onClick(View view) {
        Button button =(Button) view;
        String buttonText = button.getText().toString();
        String dataToCalculate = data.getText().toString();

        if (buttonText.equals("C")){
            output.setText("0");
            data.setText(" ");
            return;
        }
        if (buttonText.equals("=")){
            output.setText("=" + output.getText());
            return;

        }
        if (button == findViewById(R.id.clear) ){
            dataToCalculate = dataToCalculate.substring(0, dataToCalculate.length()-1);
        }
        else {
            dataToCalculate = dataToCalculate + buttonText ;
        }

        data.setText(dataToCalculate);
        String finalResult = getResult(dataToCalculate);

        if (!finalResult.equals("Err")){
            output.setText(finalResult);
        }


    }
    String getResult(String data){
        try{
            Context context = Context.enter();
            context.setOptimizationLevel(-1);
            Scriptable scriptable = context.initStandardObjects();
            String finalResult = context.evaluateString(scriptable, data, "Javascript", 1, null).toString();
            if (finalResult.endsWith(".0")){
                finalResult = finalResult.replace(".0", "");
            }
            return finalResult;
        }
        catch (Exception e){
            return "Err";
        }

    }
}