Android Google의 Mobile Vision을 이용한 바코드 스캐너 만들기

BarcodeScanner.zip

Google의 Mobile Vision을 이용한 바코드 스캐너 만들기

레퍼런스 : https://developers.google.com/android/reference/com/google/android/gms/vision/package-summary

샘플 : https://github.com/googlesamples/android-vision/tree/master/visionSamples/barcode-reader

 

* 샘플에 나와있는 소스를 기반으로 작업하지만 일부는 커스텀을 합니다

* android.hardware.Camera가 21부터 deprecated 되었지만 샘플에서 사용하므로 그대로 사용합니다

 

 

build.gradle

1 2 3 4 5

dependencies {     ...       implementation 'com.google.android.gms:play-services-vision:9.8.0' } Colored by Color Scripter

cs

* 구글플레이 서비스를 이용합니다 (만약 인터넷이 되지 않아 라이브러리를 다운받지 못하면 이용할 수 없습니다.)

 

 

AndroidManifest.xml

    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.CAMERA" />
 
    <uses-feature android:name="android.hardware.camera" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>

* 카메라 권한이 필요합니다

 

 

BarcodeActivity.java

package com.ghj.scanner;
 
import android.Manifest;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.VibrationEffect;
import android.os.Vibrator;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.Toast;
 
import com.ghj.scanner.barcode.BarcodeGraphic;
import com.ghj.scanner.barcode.BarcodeGraphicTracker;
import com.ghj.scanner.barcode.BarcodeTrackerFactory;
import com.ghj.scanner.barcode.CameraSource;
import com.ghj.scanner.barcode.CameraSourcePreview;
import com.ghj.scanner.barcode.GraphicOverlay;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.vision.MultiProcessor;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;
 
import java.io.IOException;
 
public class BarcodeActivity extends AppCompatActivity implements BarcodeGraphicTracker.BarcodeUpdateListener {
 
    //permission
    final private int PERM_REQUEST_CAMERA = 1000;
 
    //ui
    private CameraSource mCameraSource;
    private CameraSourcePreview mPreview;
    private GraphicOverlay<BarcodeGraphic> mGraphicOverlay;
    private FrameLayout boxBarcodeScan;
 
    //상수
    final private String MSG_FAIL_PERM = "카메라 권한이 없습니다";
    final private String MSG_FAIL_LIB = "라이브러리 구동에 실패했습니다";
    final private String MSG_FAIL_CAMERA = "카메라 열기에 실패했습니다";
    final private long[] VIBRATE_PATTERN = { 0, 70, 10, 40 };    //진동패턴
 
    //플래그
    private boolean isFail = false; //실패여부
    private boolean mBarcodeGrant = false;
 
    //진동
    Vibrator vibrator;
 
 
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView( R.layout.activity_barcode );
 
        mPreview = (CameraSourcePreview)findViewById(R.id.preview);
        mGraphicOverlay = (GraphicOverlay<BarcodeGraphic>)findViewById(R.id.graphicOverlay);
        boxBarcodeScan = (FrameLayout)findViewById(R.id.boxBarcodeScan);
 
        checkPermission();
        if( mBarcodeGrant ) {
            startBarcode();
        }
 
        vibrator = (Vibrator)getSystemService(VIBRATOR_SERVICE);
    }
 
    @Override
    protected void onResume() {
        super.onResume();
 
        if( !isFail ) {
            checkPermission();
 
            if( mBarcodeGrant ) {
                restartPreview();
            }
            else {
                requestPermission();
            }
        }
    }
 
    @Override
    protected void onPause() {
        super.onPause();
 
        if( mPreview != null ) {
            mPreview.stop();
        }
    }
 
    @Override
    protected void onDestroy() {
        onFinish();
 
        super.onDestroy();
    }
 
    //권한 체크
    public void checkPermission() {
        if(Build.VERSION.SDK_INT > 22) {
            if( ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED ) {
                mBarcodeGrant = false;
                return;
            }
        }
        mBarcodeGrant = true;
    }
 
    //권한 요청
    public void requestPermission() {
        if(Build.VERSION.SDK_INT > 22) {
            String[] perm = new String[]{Manifest.permission.CAMERA};
            requestPermissions(perm, PERM_REQUEST_CAMERA);
        }
    }
 
    //구글플레이 체크
    public boolean checkGooglePlay() {
        int code = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(getApplicationContext());
        if (code != ConnectionResult.SUCCESS) {
            return false;
        }
        return true;
    }
 
 
 
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if( requestCode == PERM_REQUEST_CAMERA ) {
            if( grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //권한획득 성공
                mBarcodeGrant = true;
                startBarcode();
            }
            else {
                onFailDialog( MSG_FAIL_PERM );
            }
        }
    }
 
    //바코드 시작
    public void startBarcode() {
        if( mBarcodeGrant ) {
            if( checkGooglePlay() ) {
                if( !createCameraSource() ) {
                    //라이브러리 없음
                    onFailDialog( MSG_FAIL_LIB );
                }
            }
            else {
                //구글플레이 서비스 실패
                onFailDialog( MSG_FAIL_LIB );
            }
        }
    }
 
    //카메라 객체 생성
    private boolean createCameraSource() {
        Context context = getApplicationContext();
        boolean autoFocus = true;
        boolean useFlash = false;
 
 
        //모든 바코드 검색
        BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(this).build();
        BarcodeTrackerFactory barcodeFactory = new BarcodeTrackerFactory(mGraphicOverlay, this);
        barcodeDetector.setProcessor(new MultiProcessor.Builder<>(barcodeFactory).build());
 
        //필요한 라이브러리를 다운받아서 사용할 수 있는지 여부
        if (!barcodeDetector.isOperational()) {
            return false;
        }
 
        CameraSource.Builder builder = new CameraSource.Builder(getApplicationContext(), barcodeDetector)
                .setFacing( CameraSource.CAMERA_FACING_BACK)
                .setRequestedPreviewSize(1920, 1080)
                .setRequestedFps(15.0f)
                .setFocusMode(autoFocus ? Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE : null)
                .setFlashMode(useFlash ? Camera.Parameters.FLASH_MODE_TORCH : null);
 
        mCameraSource = builder.build();
        return true;
    }
 
    //카메라 프리뷰
    private void restartPreview() throws SecurityException {
        if (mCameraSource != null) {
            try {
                mPreview.start(mCameraSource, mGraphicOverlay);
            } catch (IOException e) {
                e.printStackTrace();
                //카메라 열다가 실패
                onFailDialog( MSG_FAIL_CAMERA );
            }
        }
    }
 
    //바코드 인식됨
    @Override
    public void onBarcodeDetected(Barcode barcode) {
        try {
            if( Build.VERSION.SDK_INT >= 26 )
            {
                VibrationEffect vibrationEffect = VibrationEffect.createWaveform(VIBRATE_PATTERN, -1);
                vibrator.vibrate(vibrationEffect);
            }
            else
            {
                vibrator.vibrate(VIBRATE_PATTERN, -1);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
 
        final Barcode result = barcode;
        AsyncTask.execute(new Runnable() {
            @Override
            public void run() {
                mPreview.stop();
 
                new Handler(getMainLooper()).postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(), result.displayValue, Toast.LENGTH_SHORT).show();
 
                        Intent intent = new Intent();
                        intent.putExtra( "BARCODE_NUMBER", result.displayValue);
 
                        setResult(RESULT_OK, intent);
 
                        onFinish();
                        finish();
                    }
                }, 1000);
            }
        });
    }
 
    //바코드 해제
    public void onFinish() {
        if( mPreview != null ) {
            mPreview.release();
            mPreview = null;
        }
 
        if( mCameraSource != null ) {
            mCameraSource.release();
            mCameraSource = null;
        }
    }
 
 
    //바코드 인식 실패 다이얼로그
    public void onFailDialog(String message) {
        isFail = true;
 
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage(message)
                .setPositiveButton("확인", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        onFinish();
                        finish();
                    }
                });
        builder.show();
    }
}
 

* 바코드 인식을 성공하면 화면이 멈추고 1초후 바코드 번호를 넘깁니다

* 바코드 인식을 할 수 없으면 alert가 뜨고 클릭하면 이전화면으로 이동합니다

 

 

activity_barcode.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <com.ghj.scanner.barcode.CameraSourcePreview
        android:id="@+id/preview"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
 
        <com.ghj.scanner.barcode.GraphicOverlay
            android:id="@+id/graphicOverlay"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </com.ghj.scanner.barcode.GraphicOverlay>
 
    </com.ghj.scanner.barcode.CameraSourcePreview>
 
 
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
            android:text="바코드를 스캔하세요"
            android:textColor="#ffffff"
            android:textSize="16dp"
            android:layout_marginTop="54dp"
            android:layout_centerHorizontal="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <FrameLayout
            android:id="@+id/boxBarcodeScan"
            android:layout_centerInParent="true"
            android:layout_width="@dimen/scan_area_width"
            android:layout_height="@dimen/scan_area_height" />
    </RelativeLayout>
 
</RelativeLayout>
 
 

* RelativeLayout에 카메라가 보여지는 화면을 추가하고 그위에 뷰들을 올림으로써 커스텀할 수 있습니다

 

 

CameraSourcePreview.java

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        //카메라 프리뷰 화면을 xml에서 정한 전체화면으로 합니다
        int width = right - left;
        int height = bottom - top;
//        int width = 320;
//        int height = 240;
//        if (mCameraSource != null) {
//            Size size = mCameraSource.getPreviewSize();
//            if (size != null) {
//                width = size.getWidth();
//                height = size.getHeight();
//            }
//        }
//
//        // Swap width and height sizes when in portrait, since it will be rotated 90 degrees
//        if (isPortraitMode()) {
//            int tmp = width;
//            //noinspection SuspiciousNameCombination
//            width = height;
//            height = tmp;
//        }
        ...
    }

* 저는 카메라 프리뷰를 전체화면에 그대로 보여줍니다. 비율을 변경하지 않습니다

 

 

GraphicOverlay.java

    @Override
    protected void onDraw(Canvas canvas) {
 
        super.onDraw(canvas);
 
        synchronized (mLock) {
            if ((mPreviewWidth != 0) && (mPreviewHeight != 0)) {
                mWidthScaleFactor = (float) canvas.getWidth() / (float) mPreviewWidth;
                mHeightScaleFactor = (float) canvas.getHeight() / (float) mPreviewHeight;
            }
 
            for (Graphic graphic : mGraphics) {
                graphic.draw(canvas);
            }
 
            //todo 바깥의 dim 처리
            Paint paint = new Paint();
            paint.setColor(Color.parseColor("#AA000000"));
            paint.setStrokeWidth(1f);
 
            Path path = new Path();
            path.moveTo(0, 0);
            path.lineTo(mPreviewWidth, 0);
            path.lineTo(mPreviewWidth, mPreviewHeight);
            path.lineTo(0, mPreviewHeight);
            path.lineTo(0 , 0);
 
            if( scanRect != null ) {
                path.moveTo(scanRect.left, scanRect.top);
                path.lineTo(scanRect.left, scanRect.bottom);
                path.lineTo(scanRect.right, scanRect.bottom);
                path.lineTo(scanRect.right, scanRect.top);
                path.lineTo(scanRect.left, scanRect.top);
            }
 
            canvas.drawPath(path, paint);
        }
    }

* Dim처리하는 부분입니다

* activitiy_barcode.xml에서 background 속성을 이용하여 배경을  dim처리 해도 됩니다

 

 

결과

* 바코드를 스캔한 모습입니다