我正在尝试使用ZBar Scanner创建条形码扫描程序，但在开发过程中我遇到了错误camera is being used after camera.release() was called。
错误转到课程camera.setOneShotPreviewCallback(this);
ZBarScannerView.java
我已尝试过在stackoverflow上提出的所有类似问题，但仍然是错误。
请建议我如何解决这个问题。
这是我的代码：
ZBarScannerView.java
public class ZBarScannerView extends BarcodeScannerView {
private static final String TAG = "ZBarScannerView";
private ImageScanner mScanner;
private List<BarcodeFormat> mFormats;
private ZBarScannerView.ResultHandler mResultHandler;
private boolean switcher = true;
public ZBarScannerView(Context context) {
super(context);
this.setupScanner();
}
public ZBarScannerView(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
this.setupScanner();
}
public void setFormats(List<BarcodeFormat> formats) {
this.mFormats = formats;
this.setupScanner();
}
public void setResultHandler(ZBarScannerView.ResultHandler resultHandler) {
this.mResultHandler = resultHandler;
}
public Collection<BarcodeFormat> getFormats() {
return this.mFormats == null ? BarcodeFormat.ALL_FORMATS : this.mFormats;
}
public void setupScanner() {
this.mScanner = new ImageScanner();
this.mScanner.setConfig(0, 256, 3);
this.mScanner.setConfig(0, 257, 3);
this.mScanner.setConfig(0, 0, 0);
Iterator i$ = this.getFormats().iterator();
while (i$.hasNext()) {
BarcodeFormat format = (BarcodeFormat) i$.next();
this.mScanner.setConfig(format.getId(), 0, 1);
}
}
public void onPreviewFrame(byte[] data, Camera camera) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = parameters.getPreviewSize();
int width = size.width;
int height = size.height;
switcher = !switcher;
if(DisplayUtils.getScreenOrientation(getContext()) == Configuration.ORIENTATION_PORTRAIT) {
byte[] rotatedData = new byte[data.length];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++)
rotatedData[x * height + height - y - 1] = data[x + y * width];
}
int tmp = width;
width = height;
height = tmp;
data = rotatedData;
}
Image barcode = new Image(width, height, "Y800");
if (switcher) {
int[] pixels = applyGrayScale(data,width,height);
Bitmap bm = Bitmap.createBitmap(pixels,width,height, Bitmap.Config.ARGB_8888);
bm = MyUtils.createInvertedBitmap(bm, width, height);
pixels = new int[width*height];
bm.getPixels(pixels, 0, bm.getWidth(), 0, 0, bm.getWidth(), bm.getHeight());
encodeYUV420SP(data, pixels, bm.getWidth(), bm.getHeight());
}
barcode.setData(data);
int result = mScanner.scanImage(barcode);
if (result != 0) {
stopCamera();
if(mResultHandler != null) {
SymbolSet syms = mScanner.getResults();
final Result rawResult = new Result();
for (Symbol sym : syms) {
String symData = sym.getData();
if (!TextUtils.isEmpty(symData)) {
rawResult.setContents(symData);
rawResult.setBarcodeFormat(BarcodeFormat.getFormatById(sym.getType()));
break;
}
}
Handler var17 = new Handler(Looper.getMainLooper());
var17.post(new Runnable() {
public void run() {
ZBarScannerView.ResultHandler tmpResultHandler = ZBarScannerView.this.mResultHandler;
ZBarScannerView.this.mResultHandler = null;
ZBarScannerView.this.stopCameraPreview();
if (tmpResultHandler != null) {
tmpResultHandler.handleResult(rawResult);
}
}
});
}
} else {
camera.setOneShotPreviewCallback(this); //this always give me error camera is being used after camera.release() was called
}
}
void encodeYUV420SP(byte[] yuv420sp, int[] argb, int width, int height) {
final int frameSize = width * height;
int yIndex = 0;
int uvIndex = frameSize;
int a, R, G, B, Y, U, V;
int index = 0;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
a = (argb[index] & 0xff000000) >> 24; // a is not used obviously
R = (argb[index] & 0xff0000) >> 16;
G = (argb[index] & 0xff00) >> 8;
B = (argb[index] & 0xff) >> 0;
// well known RGB to YUV algorithm
Y = ((66 * R + 129 * G + 25 * B + 128) >> 8) + 16;
U = ((-38 * R - 74 * G + 112 * B + 128) >> 8) + 128;
V = ((112 * R - 94 * G - 18 * B + 128) >> 8) + 128;
// NV21 has a plane of Y and interleaved planes of VU each sampled by a factor of 2
// meaning for every 4 Y pixels there are 1 V and 1 U. Note the sampling is every other
// pixel AND every other scanline.
yuv420sp[yIndex++] = (byte) ((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));
if (j % 2 == 0 && index % 2 == 0) {
yuv420sp[uvIndex++] = (byte) ((V < 0) ? 0 : ((V > 255) ? 255 : V));
yuv420sp[uvIndex++] = (byte) ((U < 0) ? 0 : ((U > 255) ? 255 : U));
}
index++;
}
}
}
public void resumeCameraPreview(ZBarScannerView.ResultHandler resultHandler) {
this.mResultHandler = resultHandler;
super.resumeCameraPreview();
}
static {
System.loadLibrary("iconv");
}
public interface ResultHandler {
void handleResult(Result var1);
}
}
MainActivity.java
public class MainActivity extends ActivityMyApps implements ZBarScannerView.ResultHandler, OnClickListener, OnPermissionCallback {
protected void onCreate(Bundle savedInstanceState) {
}
@Override
protected void initView() {
super.initView();
mScannerView = new ZBarScannerView(this);
setupFormats();
cameraFrame.addView(mScannerView);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean(FLASH_STATE, mFlash);
outState.putBoolean(AUTO_FOCUS_STATE, mAutoFocus);
outState.putIntegerArrayList(SELECTED_FORMATS, mSelectedIndices);
outState.putInt(CAMERA_ID, mCameraId);
}
@Override
protected void onResume() {
super.onResume();
cameraView.handleMessage(new Message());
Toast.makeText(this, "OnResume", Toast.LENGTH_SHORT).show();
}
public void stopCamera() {
mScannerView.stopCamera();
}
@Override
protected void onPause() {
super.onPause();
stopCamera();
// closeMessageDialog();
// closeFormatsDialog();
Toast.makeText(this, "OnPause", Toast.LENGTH_SHORT).show();
}
@Override
protected void menuOpen() {
super.menuOpen();
stopCamera();
cameraResume();
}
@Override
protected void onDestroy() {
mScannerView.stopCamera();
super.onDestroy();
Toast.makeText(this, "OnDestroy", Toast.LENGTH_SHORT).show();
}
@Override
protected void menuClosed() {
super.menuClosed();
if (isCameraActive()) {
cameraResume();
} else {
isCameraActive = false;
}
}
}
我将不胜感激任何建议。谢谢