解决java.lang.RuntimeException: Camera is being used after Camera.release() was called
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2022-06-15 13:53:05
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java.lang.RuntimeException: Camera is being used after Camera.release() was called
在相机开发中,打开相机后点返回,偶尔会出现如上所示的异常,解决代码如下:
@BindView(R.id.sv_preview)
SurfaceView mSvPreview;
private BaseCameraManager cameraManager;
@Override
protected void onResume() {
super.onResume();
int hasCameraPermission = ContextCompat.checkSelfPermission(mActivity, Manifest.permission.CAMERA);
if (hasCameraPermission != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.CAMERA},
MY_PERMISSIONS_REQUEST_CAMERA);
}
//region 这里调用初始化照相机并设置SurfaceHolder的回调以解决按下home键或者按下最近应用菜单键再返回扫码界面时相机不显示的问题
cameraManager = new CameraManager(getApplication());
setSurfaceViewVisible(true);
cameraManager.setOnResultListener(this);
mSvPreview.getHolder().addCallback(this);
//endregion
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
setEmptyViewVisible(true);
//解决java.lang.RuntimeException: Camera is being used after Camera.release() was called异常
holder.removeCallback(this);
cameraManager.releaseCamera();
}
BaseCameraManager源码如下:
/**
* CameraManager的基类
* Created by Jack on 2016/7/1 12:55
* Email: [email protected]
*/
public abstract class BaseCameraManager {
private Point qrBoxSize;
boolean hook = false;
int rotate;
int count = 0;
boolean isRelease = true;
ExecutorService executor;
int displayOrientation;
private MultiFormatReader reader;
OnResultListener onResultListener;
protected Context context;
BaseCameraManager(Context context) {
this.context = context;
executor = Executors.newSingleThreadExecutor();
reader = new MultiFormatReader();
qrBoxSize = new Point();
qrBoxSize.x = (int) context.getResources().getDimension(R.dimen.width_qr_box_view);
qrBoxSize.y = (int) context.getResources().getDimension(R.dimen.height_qr_box_view);
}
QRResult getCodeValue(byte[] data, Point previewSize) {
Bitmap bitmap = null;
ByteArrayOutputStream stream = new ByteArrayOutputStream(data.length);
YuvImage image = new YuvImage(data, ImageFormat.NV21, previewSize.x, previewSize.y, null);
int left = previewSize.x - qrBoxSize.x >> 1;
int right = previewSize.x + qrBoxSize.x >> 1;
int top = previewSize.y - qrBoxSize.y >> 1;
int bottom = previewSize.y + qrBoxSize.y >> 1;
Rect rect = new Rect(left, top, right, bottom);
if (image.compressToJpeg(rect, 100, stream)) {
byte[] bytes = stream.toByteArray();
bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
}
try {
stream.close();
} catch (IOException e) {
Log.e("onPreviewFrame", e.toString());
}
if (displayOrientation > 0) {
Matrix matrix = new Matrix();
matrix.postRotate(displayOrientation);
assert bitmap != null;
Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, false);
bitmap.recycle();
bitmap = newBitmap;
}
assert bitmap != null;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int[] pixels = new int[width * height];
bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
Result result = QRUtils.decode(new RGBLuminanceSource(width, height, pixels), reader);
if (result != null) {
return new QRResult(bitmap, result);
} else {
bitmap.recycle();
return null;
}
}
public void setHook(boolean hook) {
this.hook = hook;
}
public void setOnResultListener(OnResultListener onResultListener) {
this.onResultListener = onResultListener;
}
public void shutdownExecutor() {
executor.shutdown();
}
public ExecutorService getExecutor() {
return executor;
}
public void setRotate(int rotate) {
this.rotate = rotate;
}
public abstract void connectCamera(SurfaceHolder surfaceHolder);
public abstract void setCameraParameter();
public abstract void startCapture();
public abstract void releaseCamera();
public interface OnResultListener {
void onResult(QRResult qrResult);
}
}
CameraManager源码如下:
/**
* This class is for android targets below android 5.0 and it uses old camera api
* Created by Jack on 2016/7/1 12:55
* Email: [email protected]
*/
@SuppressWarnings("deprecation")
public class CameraManager extends BaseCameraManager implements Camera.AutoFocusCallback, Camera.PreviewCallback {
private Camera camera;
public CameraManager(Context context) {
super(context);
}
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (hook || isRelease) return;
camera.setOneShotPreviewCallback(this);
}
@Override
public void connectCamera(SurfaceHolder surfaceHolder) {
if (!isRelease) return;
try {
camera = Camera.open();
isRelease = false;
camera.setPreviewDisplay(surfaceHolder);
setCameraParameter();
camera.startPreview();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public void releaseCamera() {
if (isRelease) return;
isRelease = true;
camera.setPreviewCallback(null);
camera.cancelAutoFocus();
camera.stopPreview();
try {
camera.setPreviewDisplay(null);
} catch (IOException e) {
throw new RuntimeException(e);
}
camera.release();
camera = null;
}
@Override
public void startCapture() {
if (hook || isRelease || executor.isShutdown()) return;
executor.execute(new Runnable() {
@Override
public void run() {
camera.autoFocus(CameraManager.this);
}
});
}
@Override
public void setCameraParameter() {
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
Camera.getCameraInfo(0, cameraInfo);
int degrees = 0;
switch (rotate) {
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;
}
}
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
displayOrientation = (cameraInfo.orientation + degrees) % 360;
displayOrientation = (360 - displayOrientation) % 360;
} else {
displayOrientation = (cameraInfo.orientation - degrees + 360) % 360;
}
/** Warning : may throw exception with parameters not supported */
Camera.Parameters parameters = camera.getParameters();
List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
Camera.Size bestSize = previewSizes.get(0);
for (int i = 1; i < previewSizes.size(); i++) {
if (previewSizes.get(i).width * previewSizes.get(i).height > bestSize.width * bestSize.height) {
bestSize = previewSizes.get(i);
}
}
parameters.setPreviewSize(bestSize.width, bestSize.height);
List<Camera.Size> pictureSizes = parameters.getSupportedPictureSizes();
bestSize = pictureSizes.get(0);
for (int i = 1; i < pictureSizes.size(); i++) {
if (pictureSizes.get(i).width * pictureSizes.get(i).height > bestSize.width * bestSize.height) {
bestSize = pictureSizes.get(i);
}
}
parameters.setPictureSize(bestSize.width, bestSize.height);
camera.setParameters(parameters);
camera.setDisplayOrientation(displayOrientation);
}
@Override
public void onPreviewFrame(final byte[] data, final Camera camera) {
if (hook || executor.isShutdown()) return;
Observable
.just(camera.getParameters().getPreviewSize())
.subscribeOn(Schedulers.from(executor))
.map(new Func1<Camera.Size, QRResult>() {
@Override
public QRResult call(Camera.Size size) {
return getCodeValue(data, new Point(size.width, size.height));
}
})
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<QRResult>() {
@Override
public void call(QRResult qrResult) {
if (qrResult == null) {
count++;
startCapture();
return;
}
QRUtils.vibrate(context);
if (onResultListener != null) {
onResultListener.onResult(qrResult);
}
count = 0;
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
Log.e("CameraManager", "getCodeValue() failed .");
}
});
}
}