IntentTest

11 Oct 2021 in Study on Android

IntentTest

문제

activity1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <EditText
        android:id="@+id/editNum1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="numberDecimal"
        android:hint="숫자" />

    <EditText
        android:id="@+id/editNum2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="numberDecimal"
        android:hint="숫자" />

    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="더하기" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="빼기" />

        <RadioButton
            android:id="@+id/radioButton3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="곱하기" />

        <RadioButton
            android:id="@+id/radioButton4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="나누기" />
    </RadioGroup>

    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="계산하기" />
</LinearLayout>

MainActivity.java

package kr.ac.skuniv.a1011practice;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity {
    EditText editNum1, editNum2;
    RadioGroup rg;
    RadioButton rb;
    Button btn;
    static final int REQUEST_CODE=1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editNum1 = (EditText) findViewById(R.id.editNum1);
        editNum2 = (EditText) findViewById(R.id.editNum2);
        rg = (RadioGroup) findViewById(R.id.rg);
        btn = (Button) findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                rb = (RadioButton) findViewById(rg.getCheckedRadioButtonId());
                Intent intent = new Intent(MainActivity.this,SubActivity.class);
                intent.putExtra("num1", Integer.parseInt(editNum1.getText().toString()));
                intent.putExtra("num2", Integer.parseInt(editNum2.getText().toString()));
                intent.putExtra("op", rb.getText().toString());
                startActivityForResult(intent,REQUEST_CODE);
            }
        });
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==REQUEST_CODE){
            if(resultCode==RESULT_OK){
                Toast.makeText(getApplicationContext(), data.getStringExtra("result"),Toast.LENGTH_SHORT).show();
            }
        }
    }
}

activity2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="돌아가기" />

</LinearLayout>

SubActivity.java

package kr.ac.skuniv.a1011practice;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class SubActivity extends Activity {
    Button btn2;
    int result = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.back);

        btn2 = (Button) findViewById(R.id.button2);
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=getIntent();
                int num1 = intent.getIntExtra("num1", 0);
                int num2 = intent.getIntExtra("num2", 0);
                String op = intent.getStringExtra("op");

                if(op.equals("더하기"))
                    result=num1+num2;
                else if(op.equals("빼기"))
                    result=num1-num2;
                else if(op.equals("곱하기"))
                    result=num1*num2;
                else
                    result=num1/num2;

                intent.putExtra("result", "결과 : " + result);
                setResult(RESULT_OK,intent);
                finish();
            }
        });
    }
}