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AppDev's avatar
AppDev
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...
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Greg-DB's avatar
Greg-DB
Icon for Dropbox Community Moderator rankDropbox Community Moderator
8 years ago

First, for reference, unless there is a particular reason you need to process the authorization every time, you can store and re-use access tokens, e.g., as done in the example here.

Anyway, are you using Android Studio? If so, there's a "Logcat" tab where you can selected the relevant device and thread (though they should be automatically selected for you by default) and see the output/stack trace for an exception.

Also, you don't need to add the jar manually. We recommend having your package manager download and install it automatically, as shown here. 

AppDev's avatar
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?

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