Android Zxing change orientation to portrait

Question

I\'m trying to rotate Zxing display after reading a few questions and posts about the issue. After following the instructions, the display did rotate, but the rectangle of t

Answer 1

I've tried various patches, suggested in other answers, but barcode recognition remained unreliable.

I highly recommend using repository below in portrait mode. Try it, it's fast and stable. I used it in my hybrid app.

https://github.com/Dbuggerx/BarcodeScanner

Answer 2

Well I made a small change in ProjectLibrary (xzing project) and able to change orientation landscape to portrait

In setDesiredCameraParameters method of class CameraConfigurationManager added

camera.setDisplayOrientation(90);

.. in my original project's AndroidManifest.xml file. I set screenOrientation = portrait and Its working fine on my ICS 4.0.3

   <activity
        android:name="com.google.zxing.client.android.CaptureActivity"
        android:configChanges="orientation|keyboardHidden"
        android:exported="false"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
        android:windowSoftInputMode="stateAlwaysHidden" >
        <intent-filter>
            <action android:name="com.phonegap.plugins.barcodescanner.SCAN" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity> 

Answer 3

After a lot of struggling, I found the problem, and I hope it will help someone in the future.

On initFromCameraParameters method in CameraConfigurationManager there is an assumption that the scan is ALWAYS in landscape mode, and therefor a fix when width < height. If You follow the steps in the question and remove this check, it works fine.

Answer 4

Thank you for your answer!! it really helped me, one thing that I noticed is that at least on zxing 2.1 you need to pass "rotatedData" to buildLuminanceSource instead of just "data", the line end up like this:

PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);

Hopefully this helps someone else!

Answer 5

1. In CameraConfigurationManager:

   camera.setDisplayOrientation(90);
   

2. In DecodeHandler.java:

   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;
   

3. In CameraManager.java:

   rect.left = rect.left * cameraResolution.y / screenResolution.x;
   rect.right = rect.right * cameraResolution.y / screenResolution.x;
   rect.top = rect.top * cameraResolution.x / screenResolution.y;
   rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
   

4. In CameraConfigurationManager:

   if    (width > height) {
     Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
     int temp = width;
     width = height;
     height = temp;
   }
   

5. Change android:screenOrientation="portrait" for CaptureActivity in manifest.

Answer 6

I'm a developer of Barcode Scanner. Yes, it takes a lot more than this to make it scan in portrait mode. You have to "rotate" the image data, and account for the orientation of the device, its default orientation, and its sensor's orientation.

Barcode Scanner+ scans in portrait mode, and you can integrate with it via Intent in exactly the same way that you integrate with Barcode Scanner. (However it's a for-pay app.)