Android Question No pdf viewer found in some users' phones

mc73 · Apr 9, 2022

In an app, I'm searching if at least one pdf viewer is installed, in order to open pdf files there.

In order to do that I use:

B4X:

Dim INTENT1 As Intent
INTENT1.Initialize(INTENT1.ACTION_VIEW,pdfFileName)
INTENT1.SetType("application/pdf")
INTENT1.Flags=1
'INTENT1.SetComponent("android/com.android.internal.app.ResolverActivity")
'I can't remember why I remarked the above line, but it's been ages since then      
Dim pdfAppsList As List
pdfAppsList = QueryIntent(INTENT1)
If pdfAppsList.IsInitialized=True Then 
    If pdfAppsList.Size>0 Then 
        StartActivity(INTENT1)
    end if
end if

And the queryIntent sub is:

B4X:

Sub QueryIntent(Intent1 As Intent) As List
    Dim r As Reflector
    r.Target = r.GetContext
    r.Target = r.RunMethod("getPackageManager")
    Dim list1 As List
    list1 = r.RunMethod4("queryIntentActivities", Array As Object(Intent1, 0), Array As String("android.content.Intent", "java.lang.int"))
    Dim listRes As List
    listRes.Initialize
    For i = 0 To list1.Size - 1
        r.Target = list1.Get(i)
        r.Target = r.GetField("activityInfo")
        listRes.Add(r.GetField("packageName"))
    Next
    Return listRes
End Sub

I never experienced any problem with this coding, not until now that some users complain about my app not recognizing their installed pdf viewer.

In my devices for testing, I coudln't find a problem, so I'm wondering if any of you experienced such thing and (or not) found a way to solve it.

Is it a problem with my code, for e.g. some new weird permissions?

Erel · Apr 10, 2022

1. Your code will not work on new devices. You must use FileProvider.

2. It is better and simpler to call StartActivity and catch the error:

B4X:

Try
 StartActivity(Intent)
Catch
 Log("no matching application")
End Try

mc73 · Apr 10, 2022

Erel said:
1. Your code will not work on new devices. You must use FileProvider.

2. It is better and simpler to call StartActivity and catch the error:

B4X:

Try StartActivity(Intent) Catch Log("no matching application") End Try

Hi Erel,

I will surely try the second one, I cannot even remember why I had the previous code, but it seems like I didn't get an error if no viewer was there, who knows?

In step 1 you're describing, I thought I've already done that since my code for the pdfFile goes like this:

B4X:

Dim pdfFileName As String
pdfFileName=Starter.Provider.GetFileUri(fileName)

where I have

B4X:

Public Provider As FileProvider

in the Starter module. Should I do something extra on this one?

Android Question No pdf viewer found in some users' phones

mc73

Well-Known Member

Erel

B4X founder

mc73

Well-Known Member

Android Question No pdf viewer found in some users' phones

mc73

Well-Known Member

Erel

B4X founder

mc73

Well-Known Member

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