如何将imgeview方向设置为纵向

Question

我正在开发一个用于从相机捕获图像并从图库中获取图像的应用程序，该图像将显示在“图像”视图中，一切正常，但是我的问题是图像中横向显示的方式不正确帮我转换成纵向的图像

这是我的代码

    open.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            startActivityForResult(intent, REQUEST_CODE);
        }
    });

camera.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, CAMERA_REQUEST);
        }
    });



 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK)
        try {

            if (bitmap != null) {
                bitmap.recycle();
            }
            InputStream stream = getContentResolver().openInputStream(
                    data.getData());
            bitmap = BitmapFactory.decodeStream(stream);
            stream.close();
            pic.setImageBitmap(bitmap);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    try {
        if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
            if (bitmap != null) {
                bitmap.recycle();
            }
            bitmap = (Bitmap) data.getExtras().get("data");
            pic.setImageBitmap(bitmap);
        }
    }
 catch (Exception e) {
    e.printStackTrace();
}
}

Answer 1

这是两个我用来将位图旋转到正确方向的辅助方法。 您只需将要旋转的位图及其保存文件位置的绝对路径传递给该方法，即可通过还提供的getRealPathFromURI帮助器获得该getRealPathFromURI ，您将收到正确旋转的位图。

您的密码

if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
    if (bitmap != null) {
        bitmap.recycle();
    }
    bitmap = (Bitmap) data.getExtras().get("data");
    String absPath = getRealPathFromURI(data.getData());
    Bitmap rotatedBitmap = rotateBitmap(absPath, bitmap);
    pic.setImageBitmap(rotatedBitmap);
}

助手

/**
 * Converts a Uri to an absolute file path
 *
 * @param contentUri Uri to be converted
 * @return String absolute path of Uri
 */
public String getRealPathFromURI(Uri contentUri) {

    // Can post image
    String[] proj = {MediaStore.Images.Media.DATA};
    Cursor cursor = this.getContentResolver().query(contentUri,
            proj,  // Which columns to return
            null,  // WHERE clause; which rows to return (all rows)
            null,  // WHERE clause selection arguments (none)
            null); // Order-by clause (ascending by name)
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();

    return cursor.getString(column_index);
}


/**
 * Rotates the bitmap to the correct orientation for displaying
 *
 * @param filepath absolute path of original file
 * @param originalBitmap original bitmap to be rotated
 * @return
 */
private Bitmap rotateBitmap(String filepath, Bitmap originalBitmap) {
    try {
        // Find the orientation of the original file
        ExifInterface exif = new ExifInterface(filepath);
        int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
        Matrix matrix = new Matrix();

        // Find correct rotation in degrees depending on the orientation of the original file
        switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_90:
                matrix.postRotate(90);
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                matrix.postRotate(180);
                break;
            case ExifInterface.ORIENTATION_ROTATE_270:
                matrix.postRotate(270);
                break;
            default:
                return originalBitmap;
        }

        // Create new rotated bitmap
        Bitmap rotatedBitmap = Bitmap.createBitmap(originalBitmap, 0, 0, originalBitmap.getWidth(),
                originalBitmap.getHeight(), matrix, true);

        return rotatedBitmap;

    } catch (IOException e) {
        Log.d(TAG, "File cannot be found for rotating.");
        return originalBitmap;
    }
}