Styjun

I am currently working on an application that will receive and store several photos and videos in the local file system. (On average 40 photos and 10 videos per user)

To do this, I download the media from the server and then write it to the phone.

I feel like that the writing process is rather slow and I come to explain my problem to you to know if it is indeed an anomaly or if it is a correct time and that it is cordova or simply Android limitations.

To test the performance I created an empty cordova project so as not to distort the values because of the framework or other task that the application uses at the same time.

Here is the function that will write in the smartphone :

function write(blobObject) 
 t0 = performance.now();
 var path = cordova.file.externalApplicationStorageDirectory;
 window.resolveLocalFileSystemURL(path, function (directoryEntry) 
 directoryEntry.getFile('toto.iso', create: true, exclusive: false , function (fileEntry) 
 fileEntry.createWriter(function (fileWriter) 
 var writed_size = 0;
 var chunk_size = 0.25*1024*1024;

 var writeChunk = () => 
 fileWriter.onwrite = function() 
 if (writed_size < blobObject.size) 
 writeChunk();
 
 else 
 t1 = performance.now();
 
 ;

 if (writed_size) 
 fileWriter.seek(fileWriter.length);
 

 var seeked_data = blobObject.slice(writed_size, writed_size + Math.min(chunk_size, blobObject.size - writed_size));

 fileWriter.write(seeked_data);
 writed_size += Math.min(chunk_size, blobObject.size - writed_size);
 

 writeChunk();
 );
 , function() alert('error'););
 );

Writing a 5MB file takes an average of 2385ms

Writing a 10MB file takes an average of 4774ms

Writing a 50MB file takes an average of 21867ms

Do you think it's my way of doing things that's wrong and if so, why?

Or as I think it's just limitations due to Cordova?

I'm testing from a Honor 6X.

Thank you very much for your help.