在Android中使用Intent使用文件选择器选择文件时，如何限制文件大小？

Question

我想使用Intent文件选择器选择文件，但条件是文件大小不应大于5 MB。有人可以在这方面帮助我如何限制文件大小吗？

var result = myDbContext.PurchaseProducts.GroupJoin(
    myDbContext.ProductStocks,

    purchaseProduct => purchaseProduct.Id,          // from every PurchaseProduct take the Id
    productStock => productStock.PurchaseProductId, // from every ProductStock take the foreign key

    // ResultSelector: from every PurchaseProducts, with all its matching ProductStocks
    // calculate A + B + Sum of all C of the productStocks
    (purchaseProduct, productStocksOfThisPurchaseProduct) =>
    purchaseProduct.A + purchaseProduct.B +
    productStocksOfThisPurchaseProduct.Select(productStock => productStock.C).Sum());

Answer 1

  

您可以做这样的事情

     

onActivity结果旁边

photoPath = data.getStringExtra("filepath");

        File file_image = new File(photoPath);
                        int file_Size = Integer.parseInt(String.valueOf(file_image.length() / 1024));//bytes size
                        Log.e("FileByteSize", "Byte :" + file_Size);
                        int image_inMb = file_Size / 1024;
                        Log.e("FileByteSize", "MB :" + image_inMb);
                        if (image_inMb > 5)
                        {
                            Toast.makeText(getContext(), R.string.max_allowed_size_two_mb, Toast.LENGTH_LONG).show();
    return;
                        }