问题描述
我正在尝试使用 android 8.0 版本测试 OCR 系统。 我的属性如下；
编译SDK版本：29
构建工具版本：29.0.3
Android Gradle 插件版本：4.0.1
Gradle 版本：6.1.1
其他按钮或视图没问题，只有相机不显示。
package org.techtown.qrwebview;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Matrix;
import android.hardware.SensorManager;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.util.displayMetrics;
import android.util.Log;
import android.view.OrientationEventListener;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import org.opencv.core.Rect;
import org.opencv.imgproc.Imgproc;
import static org.techtown.qrwebview.OcrActivity.sTess;
public class Cameraview extends Activity implements CameraBridgeViewBase.CvCameraviewListener2 {
private Mat img_input;
private static final String TAG = "opencv";
private CameraBridgeViewBase mOpenCvCameraview;
private String m_strOcrResult = "";
private Button mBtnOcrStart;
private Button mBtnFinish;
private TextView mTextOcrResult;
private Bitmap bmp_result;
private OrientationEventListener mOrientEventListener;
private Rect mRectRoi;
private SurfaceView mSurfaceRoi;
private SurfaceView mSurfaceRoiBorder;
private int mRoiWidth;
private int mRoiHeight;
private int mRoiX;
private int mRoiY;
private double m_dWscale;
private double m_dHscale;
private View m_viewDeco;
private int m_nUIOption;
private android.widget.RelativeLayout.LayoutParams mRelativeParams;
private ImageView mImageCapture;
private Mat m_matRoi;
private boolean mStartFlag = false;
// 현재 회전 상태 (하단 Home 버튼의 위치)
private enum mOrientHomeButton {Right,Bottom,Left,Top}
private mOrientHomeButton mCurrOrientHomeButton = mOrientHomeButton.Right;
static final int PERMISSION_REQUEST_CODE = 1;
String[] PERMISSIONS = {"android.permission.CAMERA"};
/*
// cpp 관련 부분. 지금은 필요하지 않음
static {
System.loadLibrary("opencv_java3");
System.loadLibrary("native-lib");
System.loadLibrary("imported-lib");
}
*/
private boolean hasPermissions(String[] permissions) {
// 퍼미션 확인
int result = -1;
for (int i = 0; i < permissions.length; i++) {
result = ContextCompat.checkSelfPermission(getApplicationContext(),permissions[i]);
}
if (result == PackageManager.PERMISSION_GRANTED) {
return true;
} else {
return false;
}
}
private void requestNecessaryPermissions(String[] permissions) {
ActivityCompat.requestPermissions(this,permissions,PERMISSION_REQUEST_CODE);
}
@Override
public void onRequestPermissionsResult(int requestCode,String permissions[],int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CODE: {
//퍼미션을 거절했을 때 메시지 출력 후 종료
if (!hasPermissions(PERMISSIONS)) {
Toast.makeText(getApplicationContext(),"CAMERA PERMISSION FAIL",Toast.LENGTH_LONG).show();
finish();
}
return;
}
}
}
private BaseLoaderCallback mloaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS: {
// 퍼미션 확인 후 카메라 활성화
if (hasPermissions(PERMISSIONS))
mOpenCvCameraview.enableView();
}
break;
default: {
super.onManagerConnected(status);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_view);
getwindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
if (!hasPermissions(PERMISSIONS)) { //퍼미션 허가를 했었는지 여부를 확인
requestNecessaryPermissions(PERMISSIONS);//퍼미션 허가안되어 있다면 사용자에게 요청
} else {
//이미 사용자에게 퍼미션 허가를 받음.
}
// 카메라 설정
mOpenCvCameraview = (CameraBridgeViewBase) findViewById(R.id.activity_surface_view);
mOpenCvCameraview.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraview.setCvCameraviewListener(this);
mOpenCvCameraview.setCameraIndex(0); // front-camera(1),back-camera(0)
mloaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
//뷰 선언
mBtnOcrStart = (Button) findViewById(R.id.btn_ocrstart);
mBtnFinish = (Button) findViewById(R.id.btn_finish);
mTextOcrResult = (TextView) findViewById(R.id.text_ocrresult);
mSurfaceRoi = (SurfaceView) findViewById(R.id.surface_roi);
mSurfaceRoiBorder = (SurfaceView) findViewById(R.id.surface_roi_border);
mImageCapture = (ImageView) findViewById(R.id.image_capture);
//풀스크린 상태 만들기 (상태바,네비게이션바 없애고 고정시키기)
m_viewDeco = getwindow().getDecorView();
m_nUIOption = getwindow().getDecorView().getsystemUIVisibility();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH)
m_nUIOption |= View.SYstem_UI_FLAG_HIDE_NAVIGATION;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
m_nUIOption |= View.SYstem_UI_FLAG_FULLSCREEN;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
m_nUIOption |= View.SYstem_UI_FLAG_IMMERSIVE_STICKY;
m_viewDeco.setsystemUIVisibility(m_nUIOption);
mOrientEventListener = new OrientationEventListener(this,SensorManager.SENSOR_DELAY_norMAL) {
@Override
public void onorientationChanged(int arg0) {
//방향센서값에 따라 화면 요소들 회전
// 0˚ (portrait)
if (arg0 >= 315 || arg0 < 45) {
rotateViews(270);
mCurrOrientHomeButton = mOrientHomeButton.Bottom;
// 90˚
} else if (arg0 >= 45 && arg0 < 135) {
rotateViews(180);
mCurrOrientHomeButton = mOrientHomeButton.Left;
// 180˚
} else if (arg0 >= 135 && arg0 < 225) {
rotateViews(90);
mCurrOrientHomeButton = mOrientHomeButton.Top;
// 270˚ (landscape)
} else {
rotateViews(0);
mCurrOrientHomeButton = mOrientHomeButton.Right;
}
//ROI 선 조정
mRelativeParams = new android.widget.RelativeLayout.LayoutParams(mRoiWidth + 5,mRoiHeight + 5);
mRelativeParams.setMargins(mRoiX,mRoiY,0);
mSurfaceRoiBorder.setLayoutParams(mRelativeParams);
//ROI 영역 조정
mRelativeParams = new android.widget.RelativeLayout.LayoutParams(mRoiWidth - 5,mRoiHeight - 5);
mRelativeParams.setMargins(mRoiX + 5,mRoiY + 5,0);
mSurfaceRoi.setLayoutParams(mRelativeParams);
}
};
//방향센서 핸들러 활성화
mOrientEventListener.enable();
//방향센서 인식 오류 시,Toast 메시지 출력 후 종료
if (!mOrientEventListener.canDetectOrientation()) {
Toast.makeText(this,"Can't Detect Orientation",Toast.LENGTH_LONG).show();
finish();
}
}
public void onClickButton(View v) {
switch (v.getId()) {
//Start 버튼 클릭 시
case R.id.btn_ocrstart:
if (!mStartFlag) {
// 인식을 새로 시작하는 경우
// 버튼 속성 변경
mBtnOcrStart.setEnabled(false);
mBtnOcrStart.setText("Working...");
mBtnOcrStart.setTextColor(Color.LTGRAY);
bmp_result = Bitmap.createBitmap(m_matRoi.cols(),m_matRoi.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(m_matRoi,bmp_result);
// 캡쳐한 이미지를 ROI 영역 안에 표시
mImageCapture.setVisibility(View.VISIBLE);
mImageCapture.setimageBitmap(bmp_result);
//Orientation에 따라 Bitmap 회전 (landscape일 때는 미수행)
if (mCurrOrientHomeButton != mOrientHomeButton.Right) {
switch (mCurrOrientHomeButton) {
case Bottom:
bmp_result = GetRotatedBitmap(bmp_result,90);
break;
case Left:
bmp_result = GetRotatedBitmap(bmp_result,180);
break;
case Top:
bmp_result = GetRotatedBitmap(bmp_result,270);
break;
}
}
new AsyncTess().execute(bmp_result);
} else {
//Retry를 눌렀을 경우
// ImageView에서 사용한 캡쳐이미지 제거
mImageCapture.setimageBitmap(null);
mTextOcrResult.setText(R.string.ocr_result_tip);
mBtnOcrStart.setEnabled(true);
mBtnOcrStart.setText("Start");
mBtnOcrStart.setTextColor(Color.WHITE);
mStartFlag = false;
}
break;
// 뒤로 버튼 클릭 시
case R.id.btn_finish:
//인식 결과물을 MainActivity에 전달하고 종료
Intent intent = getIntent();
intent.putExtra("STRING_OCR_RESULT",m_strOcrResult);
setResult(RESULT_OK,intent);
mOpenCvCameraview.disableView();
finish();
break;
}
}
public void rotateViews(int degree) {
mBtnOcrStart.setRotation(degree);
mBtnFinish.setRotation(degree);
mTextOcrResult.setRotation(degree);
switch (degree) {
// 가로
case 0:
case 180:
//ROI 크기 조정 비율 변경
m_dWscale = (double) 1 / 2;
m_dHscale = (double) 1 / 2;
//결과 TextView 위치 조정
mRelativeParams = new android.widget.RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
mRelativeParams.setMargins(0,convertDpToPixel(20),0);
mRelativeParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
mTextOcrResult.setLayoutParams(mRelativeParams);
break;
// 세로
case 90:
case 270:
m_dWscale = (double) 1 / 4; //h (반대)
m_dHscale = (double) 3 / 4; //w
mRelativeParams = new android.widget.RelativeLayout.LayoutParams(convertDpToPixel(300),ViewGroup.LayoutParams.WRAP_CONTENT);
mRelativeParams.setMargins(convertDpToPixel(15),0);
mRelativeParams.addRule(RelativeLayout.CENTER_VERTICAL);
mTextOcrResult.setLayoutParams(mRelativeParams);
break;
}
}
//dp 단위로 입력하기 위한 변환 함수 (px 그대로 사용 시 기기마다 화면 크기가 다르기 때문에 다른 위치에 가버림)
public int convertDpToPixel(float dp) {
Resources resources = getApplicationContext().getResources();
displayMetrics metrics = resources.getdisplayMetrics();
float px = dp * (metrics.densityDpi / 160f);
return (int) px;
}
public synchronized static Bitmap GetRotatedBitmap(Bitmap bitmap,int degrees) {
if (degrees != 0 && bitmap != null) {
Matrix m = new Matrix();
m.setRotate(degrees,(float) bitmap.getWidth() / 2,(float) bitmap.getHeight() / 2);
try {
Bitmap b2 = Bitmap.createBitmap(bitmap,bitmap.getWidth(),bitmap.getHeight(),m,true);
if (bitmap != b2) {
//bitmap.recycle(); (일반적으로는 하는게 옳으나,ImageView에 쓰이는 Bitmap은 recycle을 하면 오류가 발생함.)
bitmap = b2;
}
} catch (OutOfMemoryError ex) {
// We have no memory to rotate. Return the original bitmap.
}
}
return bitmap;
}
@Override
public void onPause() {
super.onPause();
if (mOpenCvCameraview != null)
mOpenCvCameraview.disableView();
}
@Override
public void onResume() {
super.onResume();
if (!OpenCVLoader.initDebug()) {
Log.d(TAG,"onResume :: Internal OpenCV library not found.");
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_2_0,this,mloaderCallback);
} else {
Log.d(TAG,"onResume :: OpenCV library found inside package. Using it!");
mloaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}
}
public void onDestroy() {
super.onDestroy();
if (mOpenCvCameraview != null)
mOpenCvCameraview.disableView();
}
@Override
public void onCameraviewStarted(int width,int height) {
}
@Override
public void onCameraviewStopped() {
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraviewFrame inputFrame) {
// 프레임 획득
img_input = inputFrame.rgba();
// 가로,세로 사이즈 획득
mRoiWidth = (int) (img_input.size().width * m_dWscale);
mRoiHeight = (int) (img_input.size().height * m_dHscale);
// 사이즈로 중심에 맞는 X,Y 좌표값 계산
mRoiX = (int) (img_input.size().width - mRoiWidth) / 2;
mRoiY = (int) (img_input.size().height - mRoiHeight) / 2;
// ROI 영역 생성
mRectRoi = new Rect(mRoiX,mRoiWidth,mRoiHeight);
// ROI 영역 흑백으로 전환
m_matRoi = img_input.submat(mRectRoi);
Imgproc.cvtColor(m_matRoi,m_matRoi,Imgproc.COLOR_RGBA2GRAY);
Imgproc.cvtColor(m_matRoi,Imgproc.COLOR_GRAY2RGBA);
m_matRoi.copyTo(img_input.submat(mRectRoi));
return img_input;
}
private class AsyncTess extends AsyncTask<Bitmap,Integer,String> {
@Override
protected String doInBackground(Bitmap... mRelativeParams) {
//Tesseract OCR 수행
sTess.setimage(bmp_result);
return sTess.getUTF8Text();
}
protected void onPostExecute(String result) {
//완료 후 버튼 속성 변경 및 결과 출력
mBtnOcrStart.setEnabled(true);
mBtnOcrStart.setText("Retry");
mBtnOcrStart.setTextColor(Color.WHITE);
mStartFlag = true;
m_strOcrResult = result;
mTextOcrResult.setText(m_strOcrResult);
}
}
}
我找不到原因，因为 android studio 没有给我任何错误消息。
谢谢。
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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