[안드로이드] 오류 해결 The minCompileSdk (31) specified in adependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties) 그리고 메타데이터 실습

오류 내용 : 
One or more issues found when checking AAR metadata values:

The minCompileSdk (31) specified in a
dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties)
is greater than this module's compileSdkVersion (android-27).
Dependency: androidx.appcompat:appcompat:1.4.0.
AAR metadata file: C:\Users\shin\.gradle\caches\transforms-3\뭔가에 대한 해시값 같음... 앱 아이디에 대한 해시값인가?\transformed\appcompat-1.4.0\META-INF\com\android\build\gradle\aar-metadata.properties.

 

 

Android12(API Level 31) 로 올라가면서.. 생긴 문제인 것 같음
나의 경우에는 meta-data 실습을 해 보려고 하다가 마주했다. (-> 바로 해결방법 보려면 5번으로!)

1. src > main > res > values > strings.xml
화면에 meta-data Test!!!! 가 출력되게 해 보자.
strings 안에 굳이 넣는 이유는 디컴파일 시에 value 값 노출을 막기 위함이다.

<resources>
    <string name="app_name">MetaDataTest</string>
    <string name="meta_test_str">meta-data Test!!!!</string>
</resources>

 

2. src > main > AndroidManifest.xml
meta-data 의 name(key라고 보면 됨) 과 value 를 정해 준다.
여기서 value 에 1번에서 만든 @strings/string이름 을 넣어 준다.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.devshin93.metadatatest">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MetaDataTest">

        <meta-data android:name="meta.data.key" android:value="@string/meta_test_str"/>

        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

3. src > main > res > activity_main.xml
프로젝트 생성 시 기본적으로 생성되는 xml 코드에 id 와 textSize 만 줬다.

<?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/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:textSize="50dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

 

4. src > main > java > 패키지명 > MainActivity.java
meta-data 의 key(name)로 value 값을 찾아 오는 코드를 작성해 보자.

package com.devshin93.metadatatest;

import androidx.appcompat.app.AppCompatActivity;

import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
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 tv = (TextView)findViewById(R.id.text_view);

        try {
            ApplicationInfo appInfo = getPackageManager().getApplicationInfo(this.getPackageName(), PackageManager.GET_META_DATA);
            Bundle bundle = appInfo.metaData;
            String value = bundle.getString("meta.data.key");

            tv.setText(value);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

 

5. 문제 발생!!!!
One or more issues found when checking AAR metadata values:

The minCompileSdk (31) specified in a
dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties)
is greater than this module's compileSdkVersion (android-27).
Dependency: androidx.appcompat:appcompat:1.4.0.
AAR metadata file: C:\Users\shin\.gradle\caches\transforms-3\뭔가에 대한 해시값 같음... 앱 아이디에 대한 해시값인가?\transformed\appcompat-1.4.0\META-INF\com\android\build\gradle\aar-metadata.properties.

6. 해결책
둘 중 아무거나 해도 된다.
-> 첫 번재 해결책 : compileSdk 와 targetSdk 가 31이 아닌 경우,
implementation 'androidx.appcompat:appcompat:1.3.0'

 

-> 두 번째 해결책 : compileSdk 과 targetSdk 가 31인 경우 걍 해결 됨!

 

 

 

7. 문제 해결! 결과 화면