如何設置圖片只上傳jpg和png文件？

Question

這是我正在使用的代碼，它工作得很好但是我如何只將文件類型設置為 jpg 和 png 並且不允許/不顯示圖庫中的任何其他圖像

private void ButtonOnClick(object sender, EventArgs eventArgs) {
    Intent = new Intent();
    Intent.SetType("image/*");
    Intent.SetAction(Intent.ActionGetContent);
    StartActivityForResult(Intent.CreateChooser(Intent, "Select Picture"), PickImageId);
}

#endregion

#region Get the Path of Selected Image
private string GetPathToImage(Uri uri) {
    string path = null;
    // The projection contains the columns we want to return in our query.
    string[] projection = new[] { 
            Android.Provider.MediaStore.Images.Media.InterfaceConsts.Data };
    using (ICursor cursor = ManagedQuery(uri, projection, null, null, null)) {
        if (cursor != null) {
            int columnIndex = cursor.GetColumnIndexOrThrow(Android.Provider.MediaStore.Images.Media.InterfaceConsts.Data);
            cursor.MoveToFirst();
            path = cursor.GetString(columnIndex);
        }
    }
    return path;
}
#endregion

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data) {
    // For single image Selection
    if ((requestCode == PickImageId) && (resultCode == Result.Ok) && (data != null)) {
        Uri uri = data.Data;
        _imageView.SetImageURI(uri);
        path = GetPathToImage (uri);
    }
}

Answer 1

我認為所有給出的答案都是錯誤的。 要求是允許 jpg 和 png 文件。 這僅允許選擇給定的文件類型。

首先創建 mimeTypes 數組，包括所有允許的文件類型。
然后將其放入 Intent Extras 中。

這是代碼。

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
String [] mimeTypes = {"image/png", "image/jpg","image/jpeg"};
intent.setType("*/*");
intent.putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), REQUEST_GET_SINGLE_FILE);

Answer 2

使用這個Intent.setType("image/jpg"); 而不是Intent.setType("image/*");

Answer 3

對 jpeg 使用 setType

intent.setType("image/jpeg")或intent.setType("image/jpg")

或 png

intent.setType("image/png")

Answer 4

我知道我回答晚了，但我只想分享對我有用的解決方案。

Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT); // opens shared file explorer
    galleryIntent.addCategory(Intent.CATEGORY_OPENABLE);
    String[] mimeTypes = {"image/jpeg", "image/png"};  // /jpeg will support both jpg and jpeg files
    galleryIntent.setType("image/jpeg|image/png");  // I had to include both setType and putExtra for my code to work correctly
    galleryIntent.putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
    pickImageFromGalleryForResult.launch(galleryIntent);  // you can replace this line with your startActivityForResult() here

嘗試一下並告訴我它是否適用於您的用例。