Android studio — 加法的实现

• 代码实现
• • activity_main.xml
  • MainActivity.java
  • 界面显示

package com.example.homework6;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    private EditText edit1,edit2,edit3;
    private Button button1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edit1 = (EditText) findViewById(R.id.ET1);
        edit2 = (EditText) findViewById(R.id.ET2);
        edit3 = (EditText) findViewById(R.id.ET3);
        button1 = (Button) findViewById(R.id.Button1);
        button1.setOnClickListener(new mClick());
    }
    class mClick implements View.OnClickListener {
        public void onClick(View v){
            int end;
            String end2;
            String x = edit1.getText().toString();
            String y = edit2.getText().toString();
            int input1 = Integer.valueOf(x).intValue();
            int input2 = Integer.valueOf(y).intValue();
            end = input1 + input2;
            end2 = String.valueOf(end);
            edit3.setText(end2);
        }
    }
}