[안드로이드] findViewById 그리고 View Binding

- 공통 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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

 

- 기본 MainActivity.java 코드

package com.devshin93.apktest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

 

 

- findViewById 적용한 MainActivity.java 코드

package com.devshin93.apktest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView textView = findViewById(R.id.textView);
        textView.setText("findViewById");
    }
}

 

 

- View Binding 에 필요한 configuration 추가 build.gradle (:app) 

Databinding 라이브러리는 Android Gradle 플러그인과 함께 번들로 제공됩니다. 개발자가 라이브러리의 종속 항목을 선언할 필요는 없지만, 사용 설정은 해야 합니다.

android {
	...
    
    // Android Studio 3.6 부터 4.0 이전까지
    viewBinding {
    	enabled = true
    }
    
    // Android Studio 4.0 부터
    buildFeatures {
    	viewBinding true
    }
}

 

- View Binding 적용한 MainActivity.java 코드

package com.devshin93.apktest;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import com.devshin93.apktest.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());

        setContentView(binding.getRoot());

        binding.textView.setText("View Binding");
    }
}

 

 

참조 : https://developer.android.com/topic/libraries/view-binding

뷰 결합  |  Android 개발자  |  Android Developers

 

참조 : https://developer.android.com/jetpack/androidx/releases/databinding?hl=ko 

Databinding  |  Android 개발자  |  Android Developers