모르니까 검색할거야

dependencies {

    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'gun0912.ted:tedpermission:2.0.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

특정 상황에서 권한이 필요하기 때문에, tedpermission을 쓰면 쉽게 권한 창을 만들 수 있다.

//res. xml. file_paths

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="my_images"
        path="Android/data/com.com.gohool.cameraexample/files/Pictures"/>

</paths>

//manifest


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

    <!--카메라 권한 -->
    <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/Theme.CameraExample">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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


        <!--추가 -->
        <provider
            android:authorities="com.gohool.cameraexample"
            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>

//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/result"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>

    <LinearLayout
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/btnCapture"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="촬영"/>

    </LinearLayout>



</LinearLayout>

// activity main .java


package com.gohool.cameraexample;

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

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.") //카메라권한 열때 사용자에게 보여주는 메세지
                .setDeniedMessage("카메라 권한을 거부하셨습니다.")
                .setPermissions(Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.CAMERA) //manifest에 추가한 권한
                .check();

        findViewById(R.id.btnCapture).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if(intent.resolveActivity(getPackageManager()) != null){
                    File photoFile = null; //파일쓰기시에는 항상 try catch문 필요
                    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);
                    }
                }
            }
        });

    }

    private File createImageFile() throws IOException{ //년원일분초 시간단위로 생성 후 저장
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "TEST_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,
                ".jpg",
                storageDir
        );

        imageFilePath = image.getAbsolutePath();
        return image;

    }

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

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

            int exifOrientation;
            int exifDegree;

            if (exifInterface != null) {
                exifOrientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
                exifDegree = exifOrientationToDegree(exifOrientation);

            } else {
                exifDegree = 0;
            }
            ((ImageView) findViewById(R.id.result)).setImageBitmap(rotate(bitmap, exifDegree));
        }


    }
    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);
    }


    private int exifOrientationToDegree(int exifOrientation) { //촬영중 화면 돌아갈때
        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;
    }

    PermissionListener permissionListener = new PermissionListener() {
        @Override
        public void onPermissionGranted() { //권한 허용에대한 액션
            Toast.makeText(getApplicationContext(), "권한이 허용됨", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onPermissionDenied(ArrayList<String> deniedPermissions) {
            Toast.makeText(getApplicationContext(), "권한이 거부됨", Toast.LENGTH_SHORT).show();
        }
    };
}