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- package com.example.myapplication77;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.TextView;
- public class Main extends AppCompatActivity implements View.OnAttachStateChangeListener{
- private Button btnAdd, btnsub, btndivide, btnmul;
- private TextView tvresult;
- private EditText etfirst, etsecond;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- init();
- }
- public void init() {
- btnAdd = (Button) findViewById(R.id.btnAdd);
- btndivide = (Button) findViewById(R.id.btnDivide);
- btnsub = (Button) findViewById(R.id.btnSubtract);
- btnmul = (Button) findViewById(R.id.btnMultiply);
- etfirst = (EditText) findViewById(R.id.etFirstNumber);
- etsecond = (EditText) findViewById(R.id.etSecondNumber);
- tvresult = (TextView) findViewById(R.id.tvResult);
- btnAdd.setOnClickListener((View.OnClickListener) this);
- btnsub.setOnClickListener((View.OnClickListener) this);
- btndivide.setOnClickListener((View.OnClickListener) this);
- btnmul.setOnClickListener((View.OnClickListener) this);
- }
- public void onClick(View v) {
- String num1 = etfirst.getText().toString();
- String num2 = etsecond.getText().toString();
- // по id определяем кнопку, вызвавшую этот обработчик
- switch (v.getId()) {
- case R.id.btnAdd:
- int addition = Integer.parseInt(num1) + Integer.parseInt(num2);
- tvresult.setText(String.valueOf(addition));
- break;
- case R.id.btnSubtract:
- int subtraction = Integer.parseInt(num1) - Integer.parseInt(num2);
- tvresult.setText(String.valueOf(subtraction));
- break;
- case R.id.btnDivide:
- try {
- int division = Integer.parseInt(num1) / Integer.parseInt(num2);
- tvresult.setText(String.valueOf(division));
- } catch (Exception e) {
- tvresult.setText(String.valueOf("Cannot Divide"));
- break;
- }
- case R.id.btnMultiply:
- int multiply = Integer.parseInt(num1) * Integer.parseInt(num2);
- tvresult.setText(String.valueOf(multiply));
- break;
- }
- }
- }
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