Re: [I] `download` method failing on cordova / android platform with `java.lang.NullPointerException` exception [cordova-plugin-file-transfer]

[via GitHub]

fuf-nf commented on issue #374:
URL: 
https://github.com/apache/cordova-plugin-file-transfer/issues/374#issuecomment-2069208369

   Hi,
   
   the following code is not working on Android..
   ```
   var example_external_file = 
"https://cordova.apache.org/static/img/cordova_bot.png";
   
   window.requestFileSystem(window.PERSISTENT, 128 * 1024 * 1024, function (fs) 
{
     fs.root.getFile("cordova_bot.png", {create: true}, function (fileEntry) {
       var target = fileEntry.toURL();
       cordova.fileTransfer.download(example_external_file, target, function 
(success) {
         console.log('success', success);
       }, function (err) {
         console.log('error', err);
       })
     });
   });
   ```
   
   err is:
   ```
   err = {
     body: null,
     code: 3,
     exception: "java.lang.NullPointerException",
     http_status: 200,
     source: "https://cordova.apache.org/static/img/cordova_bot.png";,
     target: "https://localhost/__cdvfile_persistent__/cordova_bot.png";
   };
   ```
   the problem is the target path.
   is should be file:// and not https://
   the problem maybe lies here 
https://github.com/apache/cordova-plugin-file/issues/619
   
   With https://  fails this code in 
[Cordova-Plugin-File](https://github.com/apache/cordova-plugin-file-transfer/blob/f12b73eb0ba70536072eeab89843c96082fce512/src/android/FileTransfer.java#L728)
   > `file = resourceApi.mapUriToFile(targetUri);`
   > targetUri = "https://localhost/__cdvfile_persistent__/cordova_bot.png";
   > file = NULL
   
   and file=NULL leads to java.lang.NullPointerException
   
   Quickfix:
    fileEntry.toURL() returns:
    "https://localhost/__cdvfile_persistent__/cordova_bot.png";
   -> wrong
   
   fileEntry.toNativeURL() also returns:
   "https://localhost/__cdvfile_persistent__/cordova_bot.png";
   -> wrong
   
   fileEntry.nativeUrl is 
"file:///data/user/0/de.fuf.corodva-app/files/files/cordova_bot.png"
   -> fine
   
   Code with quickfix:
   ```
   window.quickFix = false;
   
   function download_file(source, fileEntry, onSuccess, onError) {
     var target = fileEntry.toURL();
     // if quirksMode is enabled, use the nativeURL instead of fileEntry.toURL
     if (window.quirksMode) {
       target = fileEntry.nativeURL;
     }
     cordova.fileTransfer.download(source, target, onSuccess, function (err) {
       // ony if the error appears and quirksMode is false
       if (err.code === 3 && window.quirksMode === false) {
         // enable quirksMode
         window.quirksMode = true;
         console.log('error', err, '-> enabling quirksMode')
         // and redownload the file..
         download_file(source, fileEntry, onSuccess, onError);
         return;
       }
       onError(err);
     });
   }
   
   window.requestFileSystem(window.PERSISTENT, 128 * 1024 * 1024, function (fs) 
{
     fs.root.getFile("cordova_bot.png", {create: true}, function (fileEntry) {
       download_file(example_external_file, fileEntry, function (succ) {
         console.log("success", succ);
       }, function (err) {
         console.log("error", err);
       });
     });
   });
   ```
   
   
   
   


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