W/CameraBase﹕ An Error Occurred While Connecting To Camera: 0 On Camera.open() Call

I'm writing a camera app and whenever I call camera.open() the app crashes and then I get this error: W/CameraBase﹕ An error occurred while connecting to camera: 0 Here is how I'

Solution 1:

You manualy uploaded your application to phone. That is why camera permission is not approved. You have to open settings->applications (or something like that) and manualy approve this permission.

Solution 2:

In Android 6, make sure you request permission for the camera. Camera access is considered one of the 'dangerous permissions'.

Solution 3:

To use the following method

android.hardware.Camera.open(int cameraId)

You should pass cameraId, If you want the front camera Id you can use the following method

private int findFrontFacingCamera() {

    // Search for the front facing camera
    int numberOfCameras = Camera.getNumberOfCameras();
    for (int i = 0; i < numberOfCameras; i++) {
        CameraInfo info = new CameraInfo();
        Camera.getCameraInfo(i, info);
        if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
            cameraId = i;
            cameraFront = true;
            break;
        }
    }
    return cameraId;
}

1. If the same camera is opened by other applications, this will throw a RuntimeException.

2. You must call release() when you are done using the camera, otherwise it will remain locked and be unavailable to other applications.

3. Your application should only have one Camera object active at a time for a particular hardware camera.

Solution 4:

make sure your app has permission for camera, e.g

<uses-permission android:name="android.permission.CAMERA"/>

in AndroidManifest.xml

Solution 5:

i got the answer for this: this is for marshmallow permission issue: add this in your project:

step 1:

 private static final int REQUEST_GET_ACCOUNT = 112;
 private static final int PERMISSION_REQUEST_CODE = 200;

step2:

 int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        if (currentapiVersion >= android.os.Build.VERSION_CODES.M) {
            if (checkPermission()) {
                Toast.makeText(getApplicationContext(), "Permission already granted", Toast.LENGTH_LONG).show();
            } else {
                requestPermission();
            }
        }

step3:

private boolean checkPermission() {
        int result = ContextCompat.checkSelfPermission(getApplicationContext(), GET_ACCOUNTS);
        int result1 = ContextCompat.checkSelfPermission(getApplicationContext(), CAMERA);
        return result == PackageManager.PERMISSION_GRANTED && result1 == PackageManager.PERMISSION_GRANTED;
    }

    private void requestPermission() {
        ActivityCompat.requestPermissions(this, new String[]{GET_ACCOUNTS, CAMERA}, REQUEST_GET_ACCOUNT);
        ActivityCompat.requestPermissions(this, new String[]{WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
    }

    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_CODE:
                if (grantResults.length > 0) {

                    boolean locationAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                    boolean cameraAccepted = grantResults[1] == PackageManager.PERMISSION_GRANTED;

                    if (locationAccepted && cameraAccepted)
                        Toast.makeText(getApplicationContext(), "Permission Granted, Now you can access location data and camera", Toast.LENGTH_LONG).show();
                    else {
                        Toast.makeText(getApplicationContext(), "Permission Denied, You cannot access location data and camera", Toast.LENGTH_LONG).show();
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                            if (shouldShowRequestPermissionRationale(WRITE_EXTERNAL_STORAGE)) {
                                showMessageOKCancel("You need to allow access to both the permissions",
                                        new DialogInterface.OnClickListener() {
                                            @Override
                                            public void onClick(DialogInterface dialog, int which) {
                                                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                                                    requestPermissions(new String[]{WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE},
                                                            PERMISSION_REQUEST_CODE);
                                                }
                                            }
                                        });
                                return;
                            }
                        }

                    }
                }

                break;
        }
    }

    private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
        new android.support.v7.app.AlertDialog.Builder(CaptureActivity.this)
                .setMessage(message)
                .setPositiveButton("OK", okListener)
                .setNegativeButton("Cancel", null)
                .create()
                .show();
    }