Pantalla negra de la cámara Android

Estoy tratando de crear una aplicación que leerá un código QR, este código funcionaba de forma intermitente pero daría errores de permiso y no cargaría. Creo que tengo los arreglados, pero ahora tengo una pantalla negra. No hay errores, así que no sé dónde buscar, pero siento que tiene algo que ver con los permisos.

package com.sample.qrcodereadervision.Activity; import com.google.android.gms.vision.CameraSource; import com.google.android.gms.vision.Detector; import com.google.android.gms.vision.barcode.Barcode; import com.google.android.gms.vision.barcode.BarcodeDetector; import com.sample.qrcodereadervision.R; import android.Manifest; import android.content.pm.PackageManager; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.Snackbar; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.util.SparseArray; import android.view.SurfaceView; import android.view.View; import android.widget.TextView; import android.widget.Toast; import java.io.IOException; import permissions.dispatcher.NeedsPermission; import permissions.dispatcher.OnPermissionDenied; import permissions.dispatcher.OnShowRationale; import permissions.dispatcher.PermissionRequest; import permissions.dispatcher.PermissionUtils; import permissions.dispatcher.RuntimePermissions; @RuntimePermissions public class QRcodeReader extends AppCompatActivity { public final String TAG = getClass().getSimpleName(); private CameraSource cameraSource; /** UI Parts : Preview screen */ private SurfaceView cameraView; /** UI Parts : decoding results */ private TextView barcodeInfo; private static final int REQUEST_CAMERA = 0x00000011; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d("QRcodeReader", "onCreate"); setContentView(R.layout.activity_main); if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { requestCameraPermission(); } } @Override protected void onStart() { super.onStart(); Log.d(TAG, "onStart"); barcodeInfo = (TextView) findViewById(R.id.code_info); cameraView = (SurfaceView) findViewById(R.id.camera_view); startQRcodeReader(); // startCameraSource(); } @Override protected void onPause() { super.onPause(); Log.d(TAG, "onPause"); } //@Override //public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { // Log.d(TAG, "onRequestPermissionsResult"); // QRcodeReaderPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults); //} private void startQRcodeReader() { Log.d(TAG, "startQRcodeReader"); BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(this) .setBarcodeFormats(Barcode.QR_CODE) .build(); cameraSource = new CameraSource .Builder(this, barcodeDetector) .setAutoFocusEnabled(true) .build(); QRcodeReaderPermissionsDispatcher.startCameraSourceWithCheck(QRcodeReader.this); //requestCameraPermission(); //QR Code reading barcodeDetector.setProcessor( new Detector.Processor<Barcode>() { @Override public void release() { } @Override public void receiveDetections(Detector.Detections<Barcode> detections) { final SparseArray<Barcode> barcodes = detections.getDetectedItems(); if (barcodes.size() != 0) { barcodeInfo.post( new Runnable() { public void run() { barcodeInfo.setText( barcodes.valueAt(0).displayValue ); } }); } } }); } @NeedsPermission(Manifest.permission.CAMERA) void startCameraSource() { Log.d(TAG, "startCameraSource"); Toast.makeText(this, "\n" + "Start the camera source", Toast.LENGTH_SHORT) .show(); try { releaseCameraAndPreview(); if (cameraSource != null) { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { cameraSource.start(cameraView.getHolder()); return; } } } catch (IOException | SecurityException e) { Log.w(TAG, e); } } @SuppressWarnings("unused") @OnPermissionDenied(Manifest.permission.CAMERA) void deniedPermission() { Log.d(TAG, "deniedPermission"); if (PermissionUtils.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) { Toast.makeText(this, "\n" + "It failed to camera startup .", Toast.LENGTH_SHORT) .show(); } } @SuppressWarnings("unused") @OnShowRationale(Manifest.permission.CALL_PHONE) void showRationalForStorage(final PermissionRequest request) { Log.d(TAG, "showRationalForStorage"); Toast.makeText(this, "\n" + "The camera of the use permit is required", Toast.LENGTH_SHORT) .show(); request.proceed(); } private void releaseCameraAndPreview() { if (cameraSource != null) { cameraSource.release(); cameraSource = null; } } private void requestCameraPermission() { Log.i(TAG, "CAMERA permission has NOT been granted. Requesting permission."); if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) { Log.i(TAG, "Displaying camera permission rationale to provide additional context."); Snackbar.make(findViewById(R.id.code_info), R.string.permission_camera_rationale, Snackbar.LENGTH_INDEFINITE) .setAction(R.string.ok, new View.OnClickListener() { @Override public void onClick(View view) { ActivityCompat.requestPermissions(QRcodeReader.this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA); } }) .show(); } else { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) { Log.d(TAG, "onRequestPermissionsResult"); switch (requestCode) { case REQUEST_CAMERA: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { QRcodeReaderPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults); startCameraSource(); } else { finish(); } } break; } } }

El manifiesto

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.sample.qrcodereadervision"> <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus"/> <application android:theme="@style/AppTheme" android:label="@string/app_name" android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:supportsRtl="true"> <activity android:name=".Activity.QRcodeReader"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="barcode"/> </application> </manifest>