为什么我的Android应用中的图像拾取器会自动旋转将图像肖像造影到景观中

Question

我在我的Android应用中使用此代码来启动相机/画廊以获取图像，并将其显示到ImageView中。

当用户选择以景观为方向的图像时，每个图像都可以正常工作，但是当用户选择肖像映像时，将显示图像旋转90度。我不明白为什么..我用Android 4.3

在Galaxy S3上测试我的应用程序

我注意到只有在手机拍摄图片时才会出现问题。也许这是S3的问题？

这是我的代码：

    private void openImageIntent() {
        // Camera.
        System.gc();
        final List<Intent> cameraIntents = new ArrayList<Intent>();
        final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        final PackageManager packageManager = getPackageManager();
        final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
        for(ResolveInfo res : listCam) {
            final String packageName = res.activityInfo.packageName;
            final Intent intent = new Intent(captureIntent);
            intent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
            intent.setPackage(packageName);
            cameraIntents.add(intent);
        }
        // Filesystem.
        final Intent galleryIntent = new Intent();
        galleryIntent.setType("image/*");
        galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
        // Chooser of filesystem options.
        Intent chooserIntent = Intent.createChooser(galleryIntent, "Scegli dove prelevare l'immagine");
        // Add the camera options.
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
        //Log.i("sto lanciando il chooser","vado eh");
        startActivityForResult(chooserIntent, 4982);
    }

    private String selectedImagePath;
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK) {
            if (requestCode == 4982) {

                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
                //Log.i("immagine",selectedImagePath);
                myImageView.setImageBitmap(decodeSampledBitmapFromFile(new File(selectedImagePath)));
            }
        }
    } 
    public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }

    public static Bitmap decodeSampledBitmapFromFile(File file) {
        // First decode with inJustDecodeBounds=true to check dimensions
         BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(file.getAbsolutePath(), o);
        //The new size we want to scale to
        final int REQUIRED_SIZE=430;
        //Find the correct scale value. It should be the power of 2.
        int scale=1;
        while(o.outWidth/scale/2>=REQUIRED_SIZE && o.outHeight/scale/2>=REQUIRED_SIZE)
            scale*=2;
        //Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeFile(file.getAbsolutePath(), o2);
       }

Answer 1

许多Android设备，如果拍摄图片时将设备保留在肖像中，请不要旋转图像以形成肖像。相反，他们将图像存储在景观中，并在图像中放置一个Exif标头，以告诉任何图像查看器"嘿！请旋转这个270度！"。最有可能的是您遇到的，我知道三星设备经常有这个问题。