FIXED orientation bug on android

* #1341

Author: alexander.mai

src/mlkit/mlkit-cameraview.android.ts

@@ -35,6 +35,8 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
     this.surfaceView = null;
 
     if (this.camera != null) {
+      application.off("orientationChanged");
+
       this.camera.stopPreview();
       this.camera.setPreviewCallbackWithBuffer(null);
       try {
@@ -83,9 +85,9 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
 
         // invoke the permission dialog
         ActivityCompatClass.requestPermissions(
-            application.android.foregroundActivity || application.android.startActivity,
-            [android.Manifest.permission.CAMERA],
-            CAMERA_PERMISSION_REQUEST_CODE);
+          application.android.foregroundActivity || application.android.startActivity,
+          [android.Manifest.permission.CAMERA],
+          CAMERA_PERMISSION_REQUEST_CODE);
       }
     } else {
       console.log("There's no Camera on this device :(");
@@ -100,9 +102,9 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
 
   private hasCamera(): boolean {
     return !!utils.ad
-        .getApplicationContext()
-        .getPackageManager()
-        .hasSystemFeature("android.hardware.camera");
+      .getApplicationContext()
+      .getPackageManager()
+      .hasSystemFeature("android.hardware.camera");
   }
 
   private initView(nativeView): void {
@@ -154,6 +156,9 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
         parameters.setPreviewSize(previewSize.width, previewSize.height);
         parameters.setPreviewFormat(android.graphics.ImageFormat.NV21);
 
+        application.off("orientationChanged");
+        application.on("orientationChanged", () => { this.setRotation(this.camera, parameters, requestedCameraId ); });
+
         this.setRotation(this.camera, parameters, requestedCameraId);
 
         if (parameters.getSupportedFocusModes().contains(android.hardware.Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
@@ -173,12 +178,12 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
         const onFailureListener = this.createFailureListener();
 
         let metadata =
-            new com.google.firebase.ml.vision.common.FirebaseVisionImageMetadata.Builder()
-                .setFormat(com.google.firebase.ml.vision.common.FirebaseVisionImageMetadata.IMAGE_FORMAT_NV21)
-                .setWidth(previewSize.width)
-                .setHeight(previewSize.height)
-                .setRotation(this.rotation)
-                .build();
+          new com.google.firebase.ml.vision.common.FirebaseVisionImageMetadata.Builder()
+            .setFormat(com.google.firebase.ml.vision.common.FirebaseVisionImageMetadata.IMAGE_FORMAT_NV21)
+            .setWidth(previewSize.width)
+            .setHeight(previewSize.height)
+            .setRotation(this.rotation)
+            .build();
 
         let throttle = 0;
         this.camera.setPreviewCallbackWithBuffer(new android.hardware.Camera.PreviewCallback({
@@ -206,15 +211,15 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
             if (this.detector.processImage) {
               this.lastVisionImage = com.google.firebase.ml.vision.common.FirebaseVisionImage.fromByteBuffer(data, metadata);
               this.detector
-                  .processImage(this.lastVisionImage)
-                  .addOnSuccessListener(onSuccessListener)
-                  .addOnFailureListener(onFailureListener);
+                .processImage(this.lastVisionImage)
+                .addOnSuccessListener(onSuccessListener)
+                .addOnFailureListener(onFailureListener);
             } else if (this.detector.detectInImage) {
               this.lastVisionImage = com.google.firebase.ml.vision.common.FirebaseVisionImage.fromByteBuffer(data, metadata);
               this.detector
-                  .detectInImage(this.lastVisionImage)
-                  .addOnSuccessListener(onSuccessListener)
-                  .addOnFailureListener(onFailureListener);
+                .detectInImage(this.lastVisionImage)
+                .addOnSuccessListener(onSuccessListener)
+                .addOnFailureListener(onFailureListener);
             } else {
               this.runDetector(data, previewSize.width, previewSize.height);
             }
@@ -250,7 +255,7 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
     if (this.camera != null) {
       this.camera.stopPreview();
     }
-  };
+  }
 
   protected resumeScanning(): void {
     this.runCamera();