화면에 카메라 미리보기 넣기

서피스뷰(SurfaceView)라는 것으로 카메라 미리보기 화면이 구현된다

 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.a72_surfaceview">

    <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" />

    <uses-feature
        android:name="android.hardware.camera2"
        android:required="true" />

    <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.A72_Surfaceview">
        <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>

 

 

 

activity_main

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="사진찍기" />

    <FrameLayout
        android:id="@+id/previewFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>
</LinearLayout>

 

 

MainActivity

package com.example.a72_surfaceview;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;

import com.yanzhenjie.permission.Action;
import com.yanzhenjie.permission.AndPermission;
import com.yanzhenjie.permission.runtime.Permission;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    CameraSurfaceView cameraView;

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

        AndPermission.with(this).runtime().permission(Permission.CAMERA, Permission.READ_EXTERNAL_STORAGE, Permission.WRITE_EXTERNAL_STORAGE).onGranted(new Action<List<String>>() {
            @Override
            public void onAction(List<String> permissions) {
                showToast("허용된 권한 개수 : " + permissions.size());
            }
        }).onDenied(new Action<List<String>>() {
            @Override
            public void onAction(List<String> permissions) {
                showToast("거부된 권한 개수 : " + permissions.size());
            }
        }).start();

        FrameLayout previewFrame = findViewById(R.id.previewFrame);
        cameraView = new CameraSurfaceView(this);
        previewFrame.addView(cameraView);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                takePicture();
            }
        });


    }

    public void takePicture() {
//        CameraSurfaceView의 capture 메소드 호출
        cameraView.capture(new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                try {
//                    전달받은 바이트 배열을 Bitmap 객체로 만들기
                    Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
                    String outUriStr = MediaStore.Images.Media.insertImage(getContentResolver(), bitmap, "Captured Image", "Captured Image using Camera");

                    if (outUriStr == null) {
                        Log.d("SampleCapture", "Image insert failed.");
                        return;
                    } else {
                        Uri outUri = Uri.parse(outUriStr);
                        Log.d("SampleCapture", String.valueOf(outUri));
                        sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, outUri));
                    }

                    camera.startPreview();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    //    SurfaceHolder에 정의된 Callback 인터페이스 구현
//    서피스뷰의 상태가 변경될 때 자동 호출되는 세가지 메소드 - surfaceCreated, surfaceChanged, surfaceDestroyed
    class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback {

        private SurfaceHolder mHolder;

        //        import android.hardware.Camera;
        private Camera camera = null;

        public CameraSurfaceView(Context context) {
            super(context);

//            생성자에서 서비스홀더 객체 참조 후 설정
            mHolder = getHolder();
            mHolder.addCallback(this);
        }

        //        서비스뷰가 만들어질 때 카메라 객체를 참조한 후 미리 보기 화면으로 홀더 객체 설정
        @Override
        public void surfaceCreated(SurfaceHolder surfaceHolder) {
            camera = Camera.open();
            setCameraOrientation();
            try {
                camera.setPreviewDisplay(mHolder);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        //        서비스뷰의 화면 크기가 바뀌는 등의 변경 시점에 미리 보기 시작
        @Override
        public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
            camera.startPreview();
        }

        //        서피스뷰가 없어질 때 미리 보기 중지
        @Override
        public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
            camera.stopPreview();
            camera.release();
            camera = null;
        }

        //        카메라 객체의 takePicture 메소드를 호출하여 사진 촬영
        public boolean capture(Camera.PictureCallback handler) {
            if (camera != null) {
                camera.takePicture(null, null, handler);
                return true;
            } else {
                return false;
            }
        }

        public void setCameraOrientation() {
            if (camera == null) {
                return;
            }

            Camera.CameraInfo info = new Camera.CameraInfo();
            Camera.getCameraInfo(0, info);

            WindowManager manager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
            int rotation = manager.getDefaultDisplay().getRotation();

            int degrees = 0;
            switch (rotation) {
                case Surface.ROTATION_0:
                    degrees = 0;
                    break;
                case Surface.ROTATION_90:
                    degrees = 90;
                    break;
                case Surface.ROTATION_180:
                    degrees = 180;
                    break;
                case Surface.ROTATION_270:
                    degrees = 270;
                    break;
            }

            int result;
            if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                result = (info.orientation + degrees) % 360;
                result = (360 - result) % 360;
            } else {
                result = (info.orientation - degrees + 360) % 360;
            }

            camera.setDisplayOrientation(result);
        }

    }

    public void showToast(String message) {
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }
}