How to read large excel file in android app?

我与影子孤独终老i 提交于 2020-02-06 08:16:06

问题


My app saves the data from the uploaded excel file in Room, after that search in a selected column (by the user ) for keyword then show all row for the cell which has this keyword.

it reads small Excel files successfully but it stuck if I uploaded file more than 2 Mb at this line

Workbook myWorkBook = WorkbookFactory.create(inputStream);

and this error details ..

 java.lang.OutOfMemoryError
Failed to allocate a 40 byte allocation with 32 free bytes and 32B until OOM, max allowed footprint 402653184, growth limit 402653184

I followed this http://blog.kondratev.pro/2015/08/reading-xlsx-on-android-4-and-hopefully.html to code it.


tried Reading line by line:

InputStreamReader inputStreamReader =  new InputStreamReader(inputStream, StandardCharsets.UTF_8);
                        reader = new BufferedReader(inputStreamReader);
                        String line = null; 
                        while((line = reader.readLine())!= null){
                            Log.d(APP_LOGS, line);
                        }

but the result is:

PK��$��O������������������������������xl/worksheets/sheet1.xml��ێ�F�� C��-̠۫U�"�h�M�h�h�F
D: >���ڞ�r3������s!��|��s���T�u��wY&*��������'�:u�i��Rnݟ�v��~�\�~��R6N+P�[��4�����(��^�J�핽�Eܴ���Օ�q�
D: ��>�8+�^a�!j����TȲ�E��㦍_���P+��\�%Z�j߬UJm�ē�Dv��,P�@�~?UO�dզx�����22�{��z�x21n3��}.��+"��������"�����!��"�}/���(0Cdx��6���m�� ��͏�U{��g���ߙ�ԓc��6}S��v�-ݺ�k���_;���INu���dv86�:�N*��)o^T�O�6ǶFV��wu1�tթ'*�����ǜ�Yٿ�����_�
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How to solve it, please ? and how to read sheet by sheet from the same file ?

thanx


回答1:


Try adding android:largeHeap="true" to your <application> tag in AndroidManifest.xml. However, if this is for an app distributed to users, you should consider alternative means. Most people will not appreciate your app taking up all of their device's memory. Better would be to use a server-based solution to parse the file, and let the query only the data it needs to display the result.




回答2:


Check this library for parsing large xlsx files. Full doc is here

just add

repositories {
        maven {
            url "https://jitpack.io"
        }
    }

And

implementation 'com.github.kiranbjm:xlsxparser:1.01'

to your app level gradle file

and you can use it with

InputStream is = new FileInputStream(new File("/path/to/workbook.xlsx"));
Workbook workbook = StreamingReader.builder()
        .rowCacheSize(100)    // number of rows to keep in memory (defaults to 10)
        .bufferSize(4096)     // buffer size to use when reading InputStream to file (defaults to 1024)
        .open(is);            // InputStream or File for XLSX file (required)


来源:https://stackoverflow.com/questions/58783190/how-to-read-large-excel-file-in-android-app

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