android-calculator/calculator.java at master · jerry4897/android-calculator · GitHub

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package com.example.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

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

    public void addClick(View v){
        EditText number1 = (EditText) findViewById(R.id.number1);
        EditText number2 = (EditText) findViewById(R.id.number2);
        TextView result  = (TextView) findViewById(R.id.result);
        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1 + n2));
    }

    public void subClick(View v){
        EditText number1 = (EditText) findViewById(R.id.number1);
        EditText number2 = (EditText) findViewById(R.id.number2);
        TextView result  = (TextView) findViewById(R.id.result);
        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1 - n2));
    }

    public void mulClick(View v){
        EditText number1 = (EditText) findViewById(R.id.number1);
        EditText number2 = (EditText) findViewById(R.id.number2);
        TextView result  = (TextView) findViewById(R.id.result);
        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1 * n2));
    }

    public void divClick(View v){
        EditText number1 = (EditText) findViewById(R.id.number1);
        EditText number2 = (EditText) findViewById(R.id.number2);
        TextView result  = (TextView) findViewById(R.id.result);
        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1 / n2));
    }
}