[안드로이드 스튜디오] 버튼을 눌러 EditText에 있는 값 출력하기

activity_main.xml 코드

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="28dp"
        android:layout_marginTop="40dp"
        android:ems="10"
        android:hint="여기에 입력하세요."
        android:inputType="text"
        android:textAlignment="center"
        android:textSize="30dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="30dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="76dp"
        android:onClick="viewText"
        android:text="텍스트 보이기"
        android:textSize="30dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

</androidx.constraintlayout.widget.ConstraintLayout>

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MainActivity.JAVA 코드

package com.example.edittexttest;

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

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    TextView tv;
    EditText et;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        tv = (TextView)findViewById(R.id.textView);
        et = (EditText)findViewById(R.id.editText);
    } // end of onCreate
    
    public void viewText(View v) {
        String str;
        str = et.getText().toString(); // 입력된 값을 문자열로 바꾸어서 가져옴
        tv.setText(str); // 텍스트뷰에 설정함
        et.setText(""); // 에디트뷰 초기화
    }
    
}

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/userName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="13dp"
        android:hint="아이디"
        android:inputType="textEmailAddress"
        android:textAlignment="textStart"
        app:layout_constraintBottom_toTopOf="@+id/password"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


    <EditText
        android:id="@+id/password"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:hint="비밀번호"
        android:inputType="textPassword"
        android:textAlignment="textStart"
        app:layout_constraintBottom_toTopOf="@+id/phoneNum"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/userName" />

    <EditText
        android:id="@+id/phoneNum"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="14dp"
        android:hint="여기에 텍스트를 입력하세요."
        android:inputType="phone"
        android:textAlignment="textStart"
        app:layout_constraintBottom_toTopOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/password" />

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="22dp"
        android:onClick="onClicked"
        android:text="텍스트 보이기"
        android:textAlignment="center"
        app:layout_constraintBottom_toTopOf="@+id/textView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/phoneNum" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="63dp"
        android:singleLine="false"
        android:text="결과 출력 창"
        android:textAlignment="textStart"
        android:textSize="15dp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/imageView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="201dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:srcCompat="@drawable/dog" />


</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.edittexttest;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    EditText userName, password, phoneNum;
    TextView textView;
    ImageView iv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        userName = (EditText) findViewById(R.id.userName);
        password = (EditText) findViewById(R.id.password);
        phoneNum = (EditText) findViewById(R.id.phoneNum);
        textView = (TextView) findViewById(R.id.textView);
        iv = (ImageView)findViewById(R.id.imageView);
    }

    public void onClicked(View v) {
        String uName = userName.getText().toString();
        String pwd = password.getText().toString();
        String phone = phoneNum.getText().toString();

        String info = "아이디 : " + uName + "\n비밀번호 : " + pwd + "\n휴대폰 번호 : " + phone;
        textView.setText(info);
        userName.setText("");
        password.setText("");
        phoneNum.setText("");
        iv.setImageResource(R.drawable.cat);
    }
}

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