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- package com.example.lingkaran;
- import androidx.appcompat.app.AppCompatActivity;
- import android.view.View;
- import android.widget.EditText;
- import android.widget.Button;
- import android.os.Bundle;
- public class MainActivity extends AppCompatActivity {
- private EditText a;
- private EditText b;
- private EditText editTextLuas;
- private Button buttonHitungLuas;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- initUI();
- initEvent();
- }
- private void initUI() {
- a = (EditText) findViewById(R.id.edit1);
- b = (EditText) findViewById(R.id.edit2);
- editTextLuas = (EditText) findViewById(R.id.editTextLuas);
- buttonHitungLuas = (Button) findViewById(R.id.buttonhitungluas);
- }
- private void initEvent() {
- buttonHitungLuas.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- hitungluas();
- }
- });
- }
- private void hitungluas() {
- int Sisi1 = Integer.parseInt(a.getText().toString());
- int Sisi2 = Integer.parseInt(b.getText().toString());
- double luas = 3.14*Sisi1*Sisi2;
- editTextLuas.setText(luas + "");
- }
- }
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