如何用相机拍摄图像时垂直放置图像？

Question

我刚刚在我的应用中实现了相机。但是，当我拍摄照片并将所述照片设置为图像视图时，图像旋转。为什么会这样呢？当我垂直拍摄照片时，图像视图将水平显示，而当我水平拍摄照片时，图像视图将垂直显示。这是相机代码：

 private fun openCamera() {
    val values = ContentValues()
    values.put(MediaStore.Images.Media.TITLE,"New Picture")
    values.put(MediaStore.Images.Media.DESCRIPTION,"From the Camera")
    image_uri = contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values)
    //camera intent
    val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, image_uri)
    startActivityForResult(cameraIntent,IMAGE_CAPTURE_CODE)


}

override fun onRequestPermissionsResult(
    requestCode: Int,
    permissions: Array<out String>,
    grantResults: IntArray
) {
    //called when user presses alow or deny from premissio request
    when(requestCode){
        PERMISSION_CODE ->{
            if(grantResults.size > 0 && grantResults[0]== PackageManager.PERMISSION_GRANTED){
                //PERMISSION FROM POPUP WAS GRANTED
                openCamera()

            }else{
                //permisson from popup was denied
                Toast.makeText(this,"Permission denied", Toast.LENGTH_SHORT).show()
            }
        }
    }
}


@SuppressLint("MissingSuperCall")
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

    //called when image was captured from camera intet
    if(resultCode==Activity.RESULT_OK){
        //set image captured to image view
        image_view.setImageURI(image_uri)


        //get location

        //stop compass

    }
}

这是我的图像视图布局：

  <ImageView
    android:id="@+id/image_view"
    android:layout_width="283dp"
    android:layout_height="331dp"
    android:layout_marginTop="100dp"
    android:background="@drawable/image1"
    android:scaleType="centerCrop"
    android:orientation="vertical"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.515" />

Answer 1

这是在所有设备上发生，还是仅在某些设备上发生？据我认为，这并非应该在所有设备上都发生。你测试过吗？

您可以尝试以下解决方案。发生这种情况是因为大多数电话摄像头都是横向的，这意味着如果您以人像拍摄照片，则生成的照片将旋转90度。在这种情况下，相机软件应以查看照片的方向填充Exif数据。

此解决方案应该有效，但并非100％可靠，因为它取决于电话制造商的devive /相机Exif数据。

    ExifInterface ei = new ExifInterface(photoPath);
    int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                                     ExifInterface.ORIENTATION_UNDEFINED);

    Bitmap rotatedBitmap = null;
    switch(orientation) {

    case ExifInterface.ORIENTATION_ROTATE_90:
        rotatedBitmap = rotateImage(bitmap, 90);
        break;

    case ExifInterface.ORIENTATION_ROTATE_180:
        rotatedBitmap = rotateImage(bitmap, 180);
        break;

    case ExifInterface.ORIENTATION_ROTATE_270:
        rotatedBitmap = rotateImage(bitmap, 270);
        break;

    case ExifInterface.ORIENTATION_NORMAL:
    default:
        rotatedBitmap = bitmap;
}

    public static Bitmap rotateImage(Bitmap source, float angle) {
         Matrix matrix = new Matrix();
         matrix.postRotate(angle);
         return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(),
                               matrix, true);
    }

注意：如果此解决方案不适合您，我可能会提供另一个解决方案。

Answer 2

几个月前，我遇到了同样的问题，我可以给你一种我使用过的方法，它可以那样工作。 Android Pie之前和之后都有一些差异。无论如何，通过这种方法，您将从photoUri获取位图，并且可以使用位图最终填充imageView。如果您有任何疑问，请在这里与我联系。

// Getting captured image as a bitmap
@TargetApi(Build.VERSION_CODES.P)
private fun getCapturedImage(selectedPhotoUri: Uri): Bitmap {

    val bitmap = when {
        Build.VERSION.SDK_INT < Build.VERSION_CODES.P -> MediaStore.Images.Media.getBitmap(
            context?.contentResolver,
            selectedPhotoUri
        )
        else -> {
            val source = ImageDecoder.createSource(context!!.contentResolver, selectedPhotoUri)
            ImageDecoder.decodeBitmap(source)
        }
    }

    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, Matrix().apply {}, true)
    } else {
        MediaStore.Images.Media.getBitmap(context?.contentResolver, context?.let { getImageUri(it, bitmap) })
    }
}


// Getting image Uri from the bitmap, its needed for android level 6 (sdk 23)
private fun getImageUri(inContext: Context, inImage: Bitmap): Uri {
    val outImage: Bitmap = if (inImage.width > inImage.height) {
        Bitmap.createScaledBitmap(inImage, 2560, 1440, true)
    } else {
        Bitmap.createScaledBitmap(inImage, 1440, 2560, true)
    }
    val path = MediaStore.Images.Media.insertImage(inContext.contentResolver, outImage, "Title", null)
    return Uri.parse(path)

}