Forum Discussion

Explorer | Level 3

8 years ago

Get a list of files from dropbox to android application

Hi everybody, I'm new to dropbox developing and I need help with it please. I wrote an android application that needs to get a list of files listing in dropbox. I used the tutorial and part of the co...

API

AppDev

Explorer | Level 3

8 years ago

Hi Greg,

I don't know if I understood you correctly... I'm using Android Studio.

On SDK Manager --> SDK Update Sites I added DropBox SDK and the path https://github.com/dropbox/dropbox-sdk-java (not sure about that, first time I'm trying to use it... )

Then on build.gradle I added

dependencies {
    // ...
    compile 'com.dropbox.core:dropbox-core-sdk:3.0.8'
}

When I execute the app, the authentication is working, also

DbxClientV2 client = new DbxClientV2(config, accessToken);

Is working, but the app stop running after

ListFolderResult result = client.files().listFolder("");

or even befor that, if I try to use

FullAccount account = client.users().getCurrentAccount();

If I use the emulator, the output on Logcat is:

09-03 21:11:39.413 18255-18255/? E/Zygote: v2
09-03 21:11:39.413 18255-18255/? I/libpersona: KNOX_SDCARD checking this for 10169
KNOX_SDCARD not a persona
09-03 21:11:39.414 18255-18255/? E/Zygote: accessInfo : 0
09-03 21:11:39.414 18255-18255/? W/SELinux: SELinux selinux_android_compute_policy_index : Policy Index[2], Con:u:r:zygote:s0 RAM:SEPF_SECMOBILE_7.0_0010, [-1 -1 -1 -1 0 1]
09-03 21:11:39.416 18255-18255/? I/SELinux: SELinux: seapp_context_lookup: seinfo=untrusted, level=s0:c512,c768, pkgname=com.example.downloadfilestry
09-03 21:11:39.425 18255-18255/? I/art: Late-enabling -Xcheck:jni
09-03 21:11:39.465 18255-18255/? D/TimaKeyStoreProvider: TimaKeyStore is not enabled: cannot add TimaSignature Service and generateKeyPair Service
09-03 21:11:39.948 18255-18255/com.example.downloadfilestry I/InstantRun: starting instant run server: is main process
09-03 21:11:40.052 18255-18255/com.example.downloadfilestry W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
09-03 21:11:40.201 18255-18255/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:11:40.202 18255-18255/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:11:40.212 18255-18255/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:11:40.215 18255-18255/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:11:40.432 18255-18255/com.example.downloadfilestry D/NetworkSecurityConfig: No Network Security Config specified, using platform default
09-03 21:11:40.459 18255-18255/com.example.downloadfilestry I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
09-03 21:11:40.460 18255-18255/com.example.downloadfilestry I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
09-03 21:11:40.461 18255-18255/com.example.downloadfilestry D/AndroidRuntime: Shutting down VM
09-03 21:11:40.463 18255-18255/com.example.downloadfilestry E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.downloadfilestry, PID: 18255
java.lang.RuntimeException: Unable to resume activity {com.example.downloadfilestry/com.example.downloadfilestry.MainActivity}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3844)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3885)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3051)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1303)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:86)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
at java.net.InetAddress.getAllByName(InetAddress.java:752)
at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:209)
at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:163)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:105)
at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:489)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:465)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:371)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:503)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:130)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:261)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getOutputStream(DelegatingHttpsURLConnection.java:218)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java)
at com.dropbox.core.http.StandardHttpRequestor.getOutputStream(StandardHttpRequestor.java:123)
at com.dropbox.core.http.StandardHttpRequestor.access$000(StandardHttpRequestor.java:28)
at com.dropbox.core.http.StandardHttpRequestor$Uploader.<init>(StandardHttpRequestor.java:133)
at com.dropbox.core.http.StandardHttpRequestor.startPost(StandardHttpRequestor.java:72)
at com.dropbox.core.http.StandardHttpRequestor.startPost(StandardHttpRequestor.java:28)
at com.dropbox.core.DbxRequestUtil.startPostRaw(DbxRequestUtil.java:256)
at com.dropbox.core.v2.DbxRawClientV2$1.execute(DbxRawClientV2.java:121)
at com.dropbox.core.v2.DbxRawClientV2.executeRetriable(DbxRawClientV2.java:300)
at com.dropbox.core.v2.DbxRawClientV2.rpcStyle(DbxRawClientV2.java:116)
at com.dropbox.core.v2.files.DbxUserFilesRequests.listFolder(DbxUserFilesRequests.java:1612)
at com.dropbox.core.v2.files.DbxUserFilesRequests.listFolder(DbxUserFilesRequests.java:1662)
at com.example.downloadfilestry.MainActivity.onResume(MainActivity.java:67)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1277)
at android.app.Activity.performResume(Activity.java:7121)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3821)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3885)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3051)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)

If I use my phone, the output on Logcat is:

09-03 21:29:23.491 31016-31016/? E/Zygote: v2
09-03 21:29:23.492 31016-31016/? I/libpersona: KNOX_SDCARD checking this for 10169
KNOX_SDCARD not a persona
09-03 21:29:23.493 31016-31016/? E/Zygote: accessInfo : 0
09-03 21:29:23.493 31016-31016/? W/SELinux: SELinux selinux_android_compute_policy_index : Policy Index[2], Con:u:r:zygote:s0 RAM:SEPF_SECMOBILE_7.0_0010, [-1 -1 -1 -1 0 1]
09-03 21:29:23.494 31016-31016/? I/SELinux: SELinux: seapp_context_lookup: seinfo=untrusted, level=s0:c512,c768, pkgname=com.example.downloadfilestry
09-03 21:29:23.498 31016-31016/? I/art: Late-enabling -Xcheck:jni
09-03 21:29:23.518 31016-31016/? D/TimaKeyStoreProvider: TimaKeyStore is not enabled: cannot add TimaSignature Service and generateKeyPair Service
09-03 21:29:23.554 31016-31016/com.example.downloadfilestry W/ActivityThread: Application com.example.downloadfilestry is waiting for the debugger on port 8100...
09-03 21:29:23.574 31016-31016/com.example.downloadfilestry I/System.out: Sending WAIT chunk
09-03 21:29:24.580 31016-31023/com.example.downloadfilestry I/art: Debugger is active
09-03 21:29:24.776 31016-31016/com.example.downloadfilestry I/System.out: Debugger has connected
waiting for debugger to settle...
09-03 21:29:24.977 31016-31016/com.example.downloadfilestry I/System.out: waiting for debugger to settle...
09-03 21:29:25.177 31016-31016/com.example.downloadfilestry I/System.out: waiting for debugger to settle...
09-03 21:29:25.378 31016-31016/com.example.downloadfilestry I/System.out: waiting for debugger to settle...
09-03 21:29:25.578 31016-31016/com.example.downloadfilestry I/System.out: waiting for debugger to settle...
09-03 21:29:25.778 31016-31016/com.example.downloadfilestry I/System.out: waiting for debugger to settle...
09-03 21:29:25.979 31016-31016/com.example.downloadfilestry I/System.out: waiting for debugger to settle...
09-03 21:29:26.179 31016-31016/com.example.downloadfilestry I/System.out: debugger has settled (1500)
09-03 21:29:26.659 31016-31016/com.example.downloadfilestry I/InstantRun: starting instant run server: is main process
09-03 21:29:26.695 31016-31023/com.example.downloadfilestry I/art: Starting a blocking GC Instrumentation
09-03 21:29:26.808 31016-31016/com.example.downloadfilestry W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
09-03 21:29:27.020 31016-31016/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:29:27.024 31016-31016/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:29:27.070 31016-31016/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:29:27.083 31016-31016/com.example.downloadfilestry D/TextView: setTypeface with style : 0
09-03 21:29:37.114 31016-31021/com.example.downloadfilestry I/art: Do partial code cache collection, code=31KB, data=27KB
After code cache collection, code=30KB, data=27KB
Increasing code cache capacity to 128KB
09-03 21:29:39.360 31016-31016/com.example.downloadfilestry D/NetworkSecurityConfig: No Network Security Config specified, using platform default
09-03 21:29:41.825 31016-31016/com.example.downloadfilestry I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
09-03 21:29:41.832 31016-31016/com.example.downloadfilestry I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
09-03 21:29:42.114 31016-31021/com.example.downloadfilestry I/art: Do partial code cache collection, code=62KB, data=61KB
After code cache collection, code=60KB, data=60KB
09-03 21:29:42.115 31016-31021/com.example.downloadfilestry I/art: Increasing code cache capacity to 256KB
09-03 21:29:45.442 31016-31016/com.example.downloadfilestry D/AndroidRuntime: Shutting down VM
09-03 21:29:45.474 31016-31016/com.example.downloadfilestry E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.downloadfilestry, PID: 31016
java.lang.RuntimeException: Unable to resume activity {com.example.downloadfilestry/com.example.downloadfilestry.MainActivity}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3844)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3885)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3051)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1303)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:86)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
at java.net.InetAddress.getAllByName(InetAddress.java:752)
at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:209)
at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:163)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:105)
at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:489)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:465)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:371)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:503)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:130)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:261)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getOutputStream(DelegatingHttpsURLConnection.java:218)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java)
at com.dropbox.core.http.StandardHttpRequestor.getOutputStream(StandardHttpRequestor.java:123)
at com.dropbox.core.http.StandardHttpRequestor.access$000(StandardHttpRequestor.java:28)
at com.dropbox.core.http.StandardHttpRequestor$Uploader.<init>(StandardHttpRequestor.java:133)
at com.dropbox.core.http.StandardHttpRequestor.startPost(StandardHttpRequestor.java:72)
at com.dropbox.core.http.StandardHttpRequestor.startPost(StandardHttpRequestor.java:28)
at com.dropbox.core.DbxRequestUtil.startPostRaw(DbxRequestUtil.java:256)
at com.dropbox.core.v2.DbxRawClientV2$1.execute(DbxRawClientV2.java:121)
at com.dropbox.core.v2.DbxRawClientV2.executeRetriable(DbxRawClientV2.java:300)
at com.dropbox.core.v2.DbxRawClientV2.rpcStyle(DbxRawClientV2.java:116)
at com.dropbox.core.v2.files.DbxUserFilesRequests.listFolder(DbxUserFilesRequests.java:1612)
at com.dropbox.core.v2.files.DbxUserFilesRequests.listFolder(DbxUserFilesRequests.java:1662)
at com.example.downloadfilestry.MainActivity.onResume(MainActivity.java:67)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1277)
at android.app.Activity.performResume(Activity.java:7121)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3821)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3885)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3051)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)

what seems to be the problem now? maybe I didn't install the SDK correctly?

Is this the way you ment to install the SDK or I missedunderstood you?

Greg-DB

Dropbox Community Moderator

8 years ago

From the error output you shared, I see that you're getting a NetworkOnMainThreadException. You can find an answer about this here:

https://www.dropboxforum.com/t5/API-Support-Feedback/NetworkOnMainThreadException-connecting-to-Dropbox-account/m-p/195874/highlight/true#M17988

AppDev
Explorer | Level 3
8 years ago
I'm getting access denied, can you share the link again please?
Greg-DB
Dropbox Community Moderator
8 years ago
Apologies, here's the corrected link: https://www.dropboxforum.com/t5/API-Support-Feedback/NetworkOnMainThreadException-connecting-to-Dropbox-account/m-p/195874/highlight/true#M17988
AppDev
Explorer | Level 3
8 years ago
Hi Greg, :)

Thank you so much for all your help! From what I read about the NetworkOnMainThreadException, I decided to implement what I need with IntentService and ResultReceive, and it is working perfectly fine now! :)

One more thing I still not sure about is the installation of the SDK. Now it is working for me because I added the jar manually. From the link you gave me, I don't understand how to use android studio package manager to download and install it automatically... Do you have a tutorial link that explane how to do that? All I tried didn't work. Sorry if it basic stuff, I realy am a begginer to this world... :(
Greg-DB
Dropbox Community Moderator
8 years ago
That's more about using Gradle/Maven/Android Studio themselves, so I can't offer much help, as that's outside the scope of Dropbox API support.

That said, it looks like their respective official documentation sites have some useful information:

Gradle: https://gradle.org/guides/

Maven: https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html

Android Studio: https://developer.android.com/studio/build/dependencies

AppDev

Explorer | Level 3

8 years ago

Thanks Greg! :)

One last thing that is not working for me yet, is the download of selected files. In my app, I got a list of all files and the user chose from that list which files he wants to download. Now I want to download all those files in a loop from the IntentService I wrote. A part of my code is:

@Override
protected void onHandleIntent(Intent intent)
{
    if (intent != null)
    {
        ResultReceiver receiver = intent.getParcelableExtra("receiverTag");
        String accessToken = intent.getStringExtra("AccessTokenVal");

        DbxRequestConfig config = DbxRequestConfig.newBuilder("dropbox/MyAppName").build();
        DbxClientV2 client = new DbxClientV2(config, accessToken);

        if (intent.getAction().equals("GET_FILES"))
        {
             // The code to get the list of files
        }
        else if (intent.getAction().equals("Download_FILES"))
        {
               List<String> filesToDownload = new ArrayList<>();

               Gson gson = new Gson();
               Type type = new TypeToken<ArrayList<String>>(){}.getType();
               filesToDownload = gson.fromJson(intent.getStringExtra("DropboxFilesSelected"), type);

               boolean isAllFilesDownloaded = true;
               for (int i=0; i<filesToDownload.size(); i++)
               {
                   try
                   {
                          DbxDownloader<FileMetadata> downloader = client.files().download(filesToDownload.get(i));
                          String[] arr = filesToDownload.get(i).split("/");
                          FileOutputStream outputStream = new FileOutputStream(Environment.getExternalStorageDirectory() + "/MyAppName/MyAppFolder/" + arr[arr.length - 1]);

                          downloader.download(outputStream);
                   }
                   catch (DbxException e)
                   {
                       e.printStackTrace();
                       isAllFilesDownloaded = false;
                   }
                   catch (FileNotFoundException e)
                   {
                       e.printStackTrace();
                       isAllFilesDownloaded = false;
                   }
                   catch (IOException e)
                   {
                       e.printStackTrace();
                       isAllFilesDownloaded = false;
                   }
           }
      }
}

The code failes in the line:

DbxDownloader<FileMetadata> downloader = client.files().download(filesToDownload.get(i));

I even tried to download a file from the root and wrote the path as:

DbxDownloader<FileMetadata> downloader = client.files().download("/file.txt");

In the Logcat, this is the error I get:

E/AndroidRuntime: FATAL EXCEPTION: IntentService[DropboxActions]
Process: my project name, PID: 4118
java.lang.IllegalArgumentException: String 'path' does not match pattern
at com.dropbox.core.v2.files.DownloadArg.<init>(DownloadArg.java:42)
at com.dropbox.core.v2.files.DownloadArg.<init>(DownloadArg.java:69)
at com.dropbox.core.v2.files.DbxUserFilesRequests.download(DbxUserFilesRequests.java:1120)
at my project name.DropboxActions.onHandleIntent(DropboxActions.java:111)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:67)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.os.HandlerThread.run(HandlerThread.java:61)

Why is my path getting IllegalArgumentException? from what I read, I understood that a path to file in the root should be "/file.txt" and from a folder "/folder/file.txt".

What is wrong with my code?

Thanks again. :)

Greg-DB
Dropbox Community Moderator
8 years ago
AppDev That exception does indicate that the 'path' value you're supplying to the `download` method doesn't have the right format for a Dropbox path.

Can you double check that you're getting that same exact error for both versions of the line you pointed out? The second one, with the value "/file.txt" looks correct. That is a valid path format, and it is working for me.

For the first one, please print out the value of `filesToDownload.get(i)` just before that call to `download` to verify exactly what is being passed in.
AppDev
Explorer | Level 3
8 years ago
I printed the value of `filesToDownload.get(i)` before calling the download, and the value is "/file.txt".
For both versions I'm getting that error... :(
The values I'm getting to the list `filesToDownload', is from the dropbox method for listing the list of files in dropbox, but I double checked it again and I'm grtting the correct value "/file.txt". I verified that the file is there in the root.
There might be a problem using 'DbxDownloader<FileMetadata>'? is there anything else I can use to download a file?
Greg-DB
Dropbox Community Moderator
8 years ago
That's the correct way to download a file. I just tried that line of code myself and it is working as expected for me.

It sounds like there's something else affecting this in your project, but I can't say off hand what that might be. We'll be happy to look into it further, but we'd need to be able to reproduce it here. Can you share a small sample project that reproduces the issue?
AppDev
Explorer | Level 3
8 years ago
Hi Greg,

Sorry, it was my mistake... I didn't use Gson correctly, so when using it, I got inside the list the valuses ""/file1.txt"", ""/file2.txt"" etc. when I printed the values, I got "/file1.txt", "/file2.txt" instead of /file1.txt, /file2.txt. I thought that the extra "" are from the java println and that I'm getting the correct value...

Now everything is working for me and the files are downloading to my app.

I have no idea why the line with the hard coded file name didn't work before,

DbxDownloader<FileMetadata> downloader = client.files().download("/file.txt");

But it is working now, so all is good.

Thank you so much for helping me with everything! :)

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