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FIle > New > Android Resource File 

xml 파일 추가시 Resource type에서 XML로 바꿔주면 됨

onActivityResult에 빨간줄이 있어도 실행하는데 지장 없음

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activity_main.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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

        <ImageView
            android:id="@+id/iv_result"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
        
    </LinearLayout>
    
    <LinearLayout
        android:orientation="horizontal"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        
        <Button
            android:id="@+id/btn_capture"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="촬영"/>
        
    </LinearLayout>

</LinearLayout>

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file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<cache-path
    name="cache"
    path="." /> <!--Context.getCacheDir() 내부 저장소-->
<files-path
    name="files"
    path="." /> <!--Context.getFilesDir() 내부 저장소-->

<external-path
    name="external"
    path="."/>  <!--  Environment.getExternalStorageDirectory() 외부 저장소-->
<external-cache-path
    name="external-cache"
    path="."/> <!--  Context.getExternalCacheDir() 외부 저장소-->
<external-files-path
    name="external-files"
    path="."/> <!--  Context.getExternalFilesDir() 외부 저장소-->

</paths>

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MainActivity.java

package com.example.camera;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.FileProvider;

import android.Manifest;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import com.gun0912.tedpermission.PermissionListener;
import com.gun0912.tedpermission.TedPermission;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_IMAGE_CAPTURE = 672;
    private String imageFilePath;
    private Uri photoUri;

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

        //권한 체크
        TedPermission.with(getApplicationContext())
                .setPermissionListener(permissionListener)
                .setRationaleMessage("카메라 권한이 필요합니다")
                .setDeniedMessage("거부하셨습니다")
                .setPermissions(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA)
                .check();

        findViewById(R.id.btn_capture).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); // 촬영 하는 기본 카메라 앱을 띄우는 구문
                if(intent.resolveActivity(getPackageManager()) != null) {
                    File photoFile = null;
                    try {
                        photoFile = createimageFile();
                    } catch (IOException e) {

                    }

                    if(photoFile != null) {
                        photoUri = FileProvider.getUriForFile(getApplicationContext(), getPackageName(), photoFile);
                        intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
                        startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); // 다음 인텐트로 화면 전환이 일어났을때 다음 액티비티로 부터 값을 다시 가져옴
                    }
                }
            }

            private File createimageFile() throws IOException {
                String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                String imageFimeNAme = "TEST_" + timeStamp + "_";
                File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
                File image = File.createTempFile(
                        imageFimeNAme,
                        ".jpg",
                        storageDir
                );
                imageFilePath = image.getAbsolutePath();
                return image;
            }
        });


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bitmap bitmap = BitmapFactory.decodeFile(imageFilePath);
            ExifInterface exif = null;

            try {
                exif = new ExifInterface(imageFilePath);
            } catch (IOException e) {
                e.printStackTrace();
            }

            int exifOrientation;
            int exifDegree;

            if (exif != null) {
                exifOrientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
                exifDegree = exifOrientationToDegreess(exifOrientation);
            } else {
                exifDegree = 0;
            }

            ((ImageView) findViewById(R.id.iv_result)).setImageBitmap(rotate(bitmap,exifDegree));
        }
    }

    private int exifOrientationToDegreess(int exifOrientation) {
        if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) {
            return 90;
        } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) {
            return 180;
        } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) {
            return 270;
        }
        return 0;
    }

    private Bitmap rotate(Bitmap bitmap, float degree) {
        Matrix matrix = new Matrix();
        matrix.postRotate(degree);
        return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix,true);
    }

    PermissionListener permissionListener = new PermissionListener() {
        @Override
        // permission 허용이 됐을때 일어나는 액션을 적어주는 곳
        public void onPermissionGranted() {
            Toast.makeText(getApplicationContext(), "권한이 허용됨", Toast.LENGTH_SHORT).show();
        }

        @Override
        // permission을 거절 했을때 액션을 적어주는 곳
        public void onPermissionDenied(ArrayList<String> deniedPermissions) {
            Toast.makeText(getApplicationContext(), "권한이 거부됨", Toast.LENGTH_SHORT).show();
        }
    };
}

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AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.camera">
    
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

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

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

        <provider
            android:authorities="com.example.camera"
            android:name="androidx.core.content.FileProvider"
            android:exported="false"
            android:grantUriPermissions="true">

            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths"/>

        </provider>
    </application>

</manifest>

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build.gradle (:app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.1"

    defaultConfig {
        applicationId "com.example.camera"
        minSdkVersion 15
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'gun0912.ted:tedpermission:2.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

}