Zxing Camera in Portrait mode on Android

Question

I want to show portrait orientation on Zxing's camera.

How can this be done?

Answer 1

Here's how it works.

Step 1: Add following lines to rotate data before buildLuminanceSource(..) in decode(byte[] data, int width, int height)

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;

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

---

Step 2: Modify getFramingRectInPreview().

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;

---

Step 3: Disable the check for Landscape Mode in initFromCameraParameters(...)

CameraConfigurationManager.java

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

---

Step 4: Add following line to rotate camera insetDesiredCameraParameters(...)

CameraConfigurationManager.java

camera.setDisplayOrientation(90);

---

Step 5: Do not forget to set orientation of activity to portrait. I.e: manifest

Answer 2

To support all orientation and change automatically when rotating the activity do this, all you have to modify is the CameraManager.javaclass.

And remove this method getCurrentOrientation() from CaptureActivity.java

In CameraManager.java Create this variable:

int resultOrientation;

Add this to the openDriver(..) method:

setCameraDisplayOrientation(context, Camera.CameraInfo.CAMERA_FACING_BACK, theCamera);//this can be set after camera.setPreviewDisplay(); in api13+.

****Create this method**** Link: http://developer.android.com/reference/android/hardware/Camera.html

public static void setCameraDisplayOrientation(Context context,int cameraId, android.hardware.Camera camera) {
    android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
    android.hardware.Camera.getCameraInfo(cameraId, info);
    Display display = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    int degrees = 0;
    switch (display.getRotation()) {
    case Surface.ROTATION_0: degrees = 0; break;
    case Surface.ROTATION_90: degrees = 90; break;
    case Surface.ROTATION_180: degrees = 180; break;
    case Surface.ROTATION_270: degrees = 270; break;
    }


    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        resultOrientation = (info.orientation + degrees) % 360;
        resultOrientation = (360 - resultOrientation) % 360;  // compensate the mirror
    } else {  // back-facing
        resultOrientation = (info.orientation - degrees + 360) % 360;
    }
    camera.setDisplayOrientation(resultOrientation);
}

****Now modify getFramingRectInPreview()****

if(resultOrientation == 180 || resultOrientation == 0){//to work with landScape and reverse landScape
            rect.left = rect.left * cameraResolution.x / screenResolution.x;
            rect.right = rect.right * cameraResolution.x / screenResolution.x;
            rect.top = rect.top * cameraResolution.y / screenResolution.y;
            rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
        }else{
            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;
        }

And modify this method public PlanarYUVLuminanceSource buildLuminanceSource(..)

if(resultOrientation == 180 || resultOrientation == 0){//TODO: This is to use camera in landScape mode
        // Go ahead and assume it's YUV rather than die.
        return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
    }else{
        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;
        return new PlanarYUVLuminanceSource(rotatedData, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
    }

Answer 3

You can use my fork of zxlib https://github.com/rusfearuth/zxing-lib-without-landscape-only. I disabled landscape mode only. You can set landscape/portrait and see correct camera view.

Answer 4

Adding camera.setDisplayOrientation(90); in CameraConfigurationManager.java worked for me.

Answer 5

for zxing 3.0, working lib https://github.com/xiaowei4895/zxing-android-portrait for portrait mode

Thank you

Answer 6

I think the best library only solution is this one ...

https://github.com/SudarAbisheck/ZXing-Orient

You can include it in build.gradle as a dependency of your project in maven format ...

dependencies {
  compile ''me.sudar:zxing-orient:2.1.1@aar''
}

Answer 7

Create AnyOrientationCaptureActivity and then override default CaptureActivity then it will work.

public void scanCode() {
    IntentIntegrator integrator = new IntentIntegrator(this);
    integrator.setDesiredBarcodeFormats(CommonUtil.POSEIDON_CODE_TYPES);
    integrator.setPrompt("Scan");
    integrator.setCameraId(0);
    integrator.setBeepEnabled(false);
    integrator.setBarcodeImageEnabled(false);
    integrator.setOrientationLocked(false);
    //Override here
    integrator.setCaptureActivity(AnyOrientationCaptureActivity.class);

    integrator.initiateScan();
}

//create AnyOrientationCaptureActivity extend CaptureActivity
public class AnyOrientationCaptureActivity extends CaptureActivity {
}

Define in manifest

<activity
            android:name=".views.AnyOrientationCaptureActivity"
            android:screenOrientation="fullSensor"
            android:stateNotNeeded="true"
            android:theme="@style/zxing_CaptureTheme"
            android:windowSoftInputMode="stateAlwaysHidden"></activity>

Answer 8

This is supposed to be a synched version to the above solution

https://github.com/zxing/zxing/tree/4b124b109d90ac2960078ce68e15a39885fc1b5b

Answer 9

Additionally to @roylee's modification I had to apply the following to the CameraConfigurationManager.java in order to get best possible preview and QR code recognition quality

    diff --git a/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java b/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
index cd9d0d8..4f12c8c 100644
--- a/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
+++ b/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
@@ -56,21 +56,24 @@ public final class CameraConfigurationManager {
     Display display = manager.getDefaultDisplay();
     int width = display.getWidth();
     int height = display.getHeight();
-    // We're landscape-only, and have apparently seen issues with display thinking it's portrait 
+    // We're landscape-only, and have apparently seen issues with display thinking it's portrait
     // when waking from sleep. If it's not landscape, assume it's mistaken and reverse them:
+    /*
     if (width < height) {
       Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
       int temp = width;
       width = height;
       height = temp;
     }
+    */
     screenResolution = new Point(width, height);
     Log.i(TAG, "Screen resolution: " + screenResolution);
-    cameraResolution = findBestPreviewSizeValue(parameters, screenResolution, false);
+    cameraResolution = findBestPreviewSizeValue(parameters, screenResolution, true);//
     Log.i(TAG, "Camera resolution: " + cameraResolution);
   }

   void setDesiredCameraParameters(Camera camera) {
+    camera.setDisplayOrientation(90);
     Camera.Parameters parameters = camera.getParameters();

     if (parameters == null) {
@@ -99,7 +102,7 @@ public final class CameraConfigurationManager {
   Point getScreenResolution() {
     return screenResolution;
   }
-  
+
   public void setFrontCamera(boolean newSetting) {
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
     boolean currentSetting = prefs.getBoolean(PreferencesActivity.KEY_FRONT_CAMERA, false);
@@ -109,12 +112,12 @@ public final class CameraConfigurationManager {
       editor.commit();
     }
   }
-  
+
   public boolean getFrontCamera() {
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
     return prefs.getBoolean(PreferencesActivity.KEY_FRONT_CAMERA, false);
   }
-  
+
   public boolean getTorch() {
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
     return prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false);
@@ -181,7 +184,14 @@ public final class CameraConfigurationManager {
       Camera.Size defaultSize = parameters.getPreviewSize();
       bestSize = new Point(defaultSize.width, defaultSize.height);
     }
+
+    // FIXME: test the bestSize == null case!
+    // swap width and height in portrait case back again
+    if (portrait) {
+        bestSize = new Point(bestSize.y, bestSize.x);
+    }
     return bestSize;
+
   }

   private static String findSettableValue(Collection<String> supportedValues,