Android Question Download a file from my app to user phone? (SOLVED)

[Stichler]

I may be very bad at this so I appreciate your patience, but for the life of me I can not figure out how to have a file in my app, in this case a .pdf, and let the user download the file to their phone via a button click. Help please?

 

[Don Oso]

Check this -> https://www.b4x.com/android/forum/threads/download-huge-files-with-httputils2.30220/#content

 

[Erel]

Where is the file stored?

 

[Stichler]

As of now in the assets folder. I want it to be part of the app, then the user can click the button and download it directly from the qpp

 

[Erel]

then the user can click the button and download it directly from the qpp

What is the user expected to do with this file? Where will it be saved?

 

[Stichler]

It is a coloring page, im unsure where to save it on their phone? I tried clicking to just open it so they could print it out but cant figure out the code to do so.

 

[Erel]

There is no file manager in Android. Users are not expected to browse the file system.

If you want to open an image with the default image viewer then you should use an intent.

 

[Stichler]

I tried this:

Dim i As Intent
    i.Initialize(i.ACTION_VIEW, "file://" & File.DirAssets & "/christmastree.pdf")
    i.SetType("application/pdf")
    StartActivity(i)

but get this:

** Service (starter) Destroy (ignored)**
** Activity (coloring) Pause, UserClosed = true **
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = true **
** Activity (coloring) Create, isFirst = true **
** Activity (coloring) Resume **
Error occurred on line: 38 (Coloring)
android.os.FileUriExposedException: file://AssetsDir/christmastree.pdf exposed beyond app through Intent.getData()
at android.os.StrictMode.onFileUriExposed(StrictMode.java:1958)
at android.net.Uri.checkFileUriExposed(Uri.java:2356)
at android.content.Intent.prepareToLeaveProcess(Intent.java:10511)
at android.content.Intent.prepareToLeaveProcess(Intent.java:10465)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1616)
at android.app.Activity.startActivityForResult(Activity.java:4564)
at android.app.Activity.startActivityForResult(Activity.java:4522)
at android.app.Activity.startActivity(Activity.java:4883)
at android.app.Activity.startActivity(Activity.java:4851)
at anywheresoftware.b4a.keywords.Common.StartActivity(Common.java:848)
at b4a.example.coloring._btntree_click(coloring.java:395)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:735)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:357)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:260)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:6891)
at android.widget.TextView.performClick(TextView.java:12651)
at android.view.View$PerformClick.run(View.java:26083)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

 

[Stichler]

also i've seen this:
https://www.b4x.com/android/forum/threads/share-txt-files.73166/#post-464921

but no clue how to implement it for my purposes

 

[Stichler]

lol I'm lost

 

[Stichler]

I sort of got it

 

[npsonic]

If your app always needs that specific file why not just add it to File dir so you can access it from path File.Combine(File.DirAssets,"yourfilename.pdf")

 

[Stichler]

Its in my app assests, but its a coloring page that i want the user to be able to ooen and print, i think i figured it out

 

[npsonic]

Its in my app assests, but its a coloring page that i want the user to be able to ooen and print, i think i figured it out

You can copy the file anywhere you want from assets.

 

[Stichler]

Ok so what would i code to click a button and have the pdf file saved to their phone? Im sorry im so bad at this, ty for your patience.

 

[npsonic]

Ok so what would i code to click a button and have the pdf file saved to their phone? Im sorry im so bad at this, ty for your patience.

You can design it anyway you like. File can be copied for example to external dir after you have get permission from user.

You can add button or it can be automatic copy after your app has permission to write external dir.

 

[Stichler]

Im sorry, im asking for a code example.

 

[npsonic]

Im sorry, im asking for a code example.

Check more about RuntimePermissions. If your app don't have write permission this does not work.

File.Copy(File.DirAssets,"yourfilename.pdf",File.DirRootExternal,"yourfilename.pdf")

 

[Stichler]

Ty

 

[Stichler]

I use this code, but nothing is being copied to download folder. I have permissions set properly I check in log list permissions.

 File.Copy(File.DirAssets,"christmastree.pdf",File.DirDefaultExternal,"Download")