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DataBinding - findViewById ÀÌÁ¦ ¾È³ç~
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Á¤¸» ±¸±ÛÀº °³¹ßÀÚ¿¡°Ô Ä£ÀýÇÑ µí Çϳ׿ä.
ÁÁÀº ¶óÀ̺귯¸®°¡ À־ °øÀ¯ ÇÏ°íÀÚ ÇÕ´Ï´Ù.

DataBindingÀ» ÇÒ ¼ö ÀÖ´Â ¶óÀ̺귯¸®Àä.
https://developer.android.com/topic/libraries/data-binding/index.html#studio_support

Á¦°¡ ÀÌ ¶óÀ̺귯¸®·Î ¼³¸íÇÏ°íÀÚ ÇÏ´Â ³»¿ëÀº ¾Æ·¡ ÀÔ´Ï´Ù.

1. findViewById´Â ÀÌÁ¦ »ç¿ëÇÏÁö ¾Ê¾Æµµ µÈ´Ù.
2. °¢ View¸¦ Àü¿ª º¯¼ö·Î ÀúÀåÇؼ­ »ç¿ëÇÏÁö ¾Ê¾Æµµ µÈ´Ù.
3. °¢ View¸¦ ÇØ´ç View¿¡ ¸Â°Ô ij½ºÆ® ÇÒ ÇÊ¿ä°¡ ¾ø´Ù.

The Data Binding Library offers both flexibility and broad compatibility — it's a support library, so you can use it with all Android platform versions back to Android 2.1 (API level 7+).
To use data binding, Android Plugin for Gradle 1.5.0-alpha1 or higher is required.

À§¿Í °°ÀÌ api 7 ÀÌ»ó Gradle pluginÀÎÀº 1.5.0-alpha1 ÀÌ»óÀ» »ç¿ëÇ϶ó°í Çϳ׿ä. Âü°íÇϼ¼¿ä.



±×·³ ±âÁ¸ÀÇ »ç¿ëÇÏ´ø Çü½ÄÀ» º¼±î¿ä?

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    TextView mTxtHello;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTxtHello = (TextView) findViewById(R.id.txt_hello);
    }
}
À§¿Í °°ÀÌ View¸¦ È£Ãâ Çß¾ú½À´Ï´Ù.
ÀÌÀü ButterKnife ¶óÀ̺귯¸®¸¦ ÀÌ¿ëÇϸé Àú·± ¼ö°í¸¦ ´ú ¼ö Àִµ¥, Àú °°Àº °æ¿ì ¹ö±×°¡ Á¦¹ý ¹ß»ý Çؼ­ »ç¿ë ¾ÈÇß¾ú°Åµç¿ä.

±×·³ DataBindingÀ» ÇÏ¸é ¾î¶»°Ô ¼Ò½º°¡ º¯ÇÏ´À³Ä.


import android.databinding.DataBindingUtil;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.gogorchg.nomorefindviewbyid.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
    ActivityMainBinding mBinding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        mBinding.txtHello.setText("¹ÙÀεù ¼º°ø!");
    }
}
DataBindgUtil À̶ó´Â Ŭ·¡½º¿¡ ·¹À̾ƿôÀ» Á¤ÀÇ ÇØÁÖ°í,
return ¹ÞÀº ActivityMainBindingÀ» ÀÌ¿ëÇϱ⸸ ÇÏ¸é µË´Ï´Ù.


## ±×·³ DataBindingÀ» »ç¿ë ÇÏ´Â ¹æ¹ýÀ» ¾Ë·Áµå¸®°Ú½À´Ï´Ù. (¾ÆÁÖ °£´ÜÇÔ)
¾Æ·¡¿Í °°ÀÌ app/build.gradle ¿¡ Ãß°¡ÇØÁÖ¼¼¿ä.

android {
    ...

    dataBinding {
        enabled = true
    }
}

±×¸®°í  res/layout/activity_main.xml ¿¡ <layout ></layout>À¸·Î °¨½ÎÁÖ½Ã¸é µË´Ï´Ù.
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.gogorchg.nomorefindviewbyid.MainActivity">

        <TextView
            android:id="@+id/txt_hello"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!" />
    </RelativeLayout>
</layout>

³¡ ÀÔ´Ï´Ù.

ÀÚ Sync¸¦ ´Ù½Ã ¹ÞÀ¸½Ã°Å³ª clean build¸¦ ÇϽŠÈÄ À§¿Í °°ÀÌ ÇÏ½Ã¸é µË´Ï´Ù.

±×·³ ActivityMainBinding Ŭ·¡½º´Â ¾î¶»°Ô ¸¸µé°í! txtHello ´Â ¾î¶»°Ô Á¤ÀÇ Çϳª¿ä???

¶ó´Â Áú¹®ÀÌ ¹«Á¶°Ç µé¾î¿Í¾ß ÇÕ´Ï´Ù. ¤¾ (Àúµµ ±×·¨À¸´Ï±ñ¿ä)

´äÀº ÀÚµ¿ÀÔ´Ï´Ù!!!

ActivityMainBinding Ŭ·¡½º´Â Á¦°¡ xml À̸§À» activity_main À¸·Î Á¤ÀÇ Ç߱⠶§¹®¿¡ Àú·± ½ÄÀ¸·Î ¸¸µé¾î Áø°Ì´Ï´Ù.
'_'¸¦ Áß½ÉÀ¸·Î µÚÂÊ ¹®ÀÚ°¡ ´ë¹®ÀÚ°¡ µÇ´Â °ÍÀÌÁÒ.

activity_love.xml ÀÏ °æ¿ì´Â ActivityLoveBinding À̶ó´Â Ŭ·¡½º°¡ ÀÚµ¿ »ý¼º µÇ°ÚÁÒ?

txtHello µµ ¸¶Âù°¡Áö ÀÔ´Ï´Ù.
txt_hello ¶ó°¡ id¸¦ Á¤ÀÇ ÇÏ¿´±â ¶§¹®¿¡ txtHello°¡ µÇ´Â °ÍÀÌÁÒ.

°³¹ßÀÚ ºÐµéÀº ´Ù¸¥ ¼ÂÆÃÀº ½Å°æ ¾²ÁöÁö ¸¶½Ã°í ±×³É ÀÚµ¿À¸·Î ¸¸µé¾îÁø Ŭ·¡½º¸¦ »ç¿ëÇÏ½Ã¸é µË´Ï´Ù.^^
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