Ошибка камеры 2 при использовании Vision API (сканирование штрих-кода) ⇐ Android

[Anonymous]

Я не знаю, почему при запуске приложения появляется ошибка камеры 2...

Приложение должно иметь CameraPreview, где я могу обнаружил штрих-код, и после обнаружения я хочу использовать данные (например, в тосте или других местах).

Где возникает проблема?

Стек ошибок

Код: Выделить всё

05-07 10:37:35.641 10828-10835/ibas.placeanorder W/art: Suspending all threads took: 5.398ms
05-07 10:37:36.750 10828-10828/ibas.placeanorder I/Choreographer: Skipped 74 frames!  The application may be doing too much work on its main thread.
05-07 10:37:45.463 10828-10828/ibas.placeanorder E/Camera: Error
205-07 10:37:45.490 10828-10828/ibas.placeanorder I/InputMethodManager [IMM] startInputInner - mService.startInputOrWindowGainedFocus

Действия

Код: Выделить всё

public class WelcomeActivity extends CaptureActivity {

//Apache License for Scanner:
//http://www.apache.org/licenses/LICENSE-2.0

SurfaceView cameraPreview;
BarcodeDetector barcodeDetector;
CameraSource cameraSource;
final int REQUEST_CAMERA_PERSMISSION = 1001;

RequestQueue queue;

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch(requestCode){
case REQUEST_CAMERA_PERSMISSION:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED){
return;
}
try{
cameraSource.start(cameraPreview.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

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

queue = Volley.newRequestQueue(this);

cameraPreview = (SurfaceView) findViewById(R.id.cameraPreview);

barcodeDetector = new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.QR_CODE)
.build();

cameraSource = new CameraSource
.Builder(this, barcodeDetector)
.setRequestedPreviewSize(640, 480)
.build();

//Add Event
cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
if (ActivityCompat.checkSelfPermission(WelcomeActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
//Request Permission
ActivityCompat.requestPermissions(WelcomeActivity.this,
new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERSMISSION);
return;
}
try {
cameraSource.start(cameraPreview.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}

@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

}

@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
cameraSource.stop();
}
});

barcodeDetector.setProcessor(new Detector.Processor() {
@Override
public void release() {

}

@Override
public void receiveDetections(Detector.Detections detections) {
SparseArray  qrcodes = detections.getDetectedItems();
if(qrcodes.size() != 0){
Toast.makeText(WelcomeActivity.this, "Qr-Code gefunden: " + qrcodes.valueAt(0).displayValue, Toast.LENGTH_SHORT).show();
Log.i("111111", "Qr-Code gefunden: " + qrcodes.valueAt(0).displayValue);
}
}
});
}

// Get the results:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if(result != null) {
if(result.getContents() == null) {
Toast.makeText(this, "Cancelled", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "Scanned: " + result.getContents(), Toast.LENGTH_LONG).show();
Log.i("scanned ", result.getContents());

CharSequence qrCodeBedingung = "qrc.sx";
if(result.getContents().contains(qrCodeBedingung)){
Log.i("qrCode? ", "Ja, QR-Code ist korrekt: " + result.getContents());

Log.i("code", result.getContents().substring(result.getContents().length()-6));

}else{

new AlertDialog.Builder(WelcomeActivity.this)
.setTitle("Information")
.setMessage("Kein gültiger QR-Code.")
.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {

dialogInterface.cancel();
}
}).show();
}
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}}

Спасибо.

Подробнее здесь: https://stackoverflow.com/questions/438 ... e-scanning