Android Question read/write list view

[mohsen nasrabady]

hi i used this code to read a listview but error
java.lang.RuntimeException: Object should first be initialized (ListView).

but the listview is initialized

what's the problem?

Dim ra As RandomAccessFile
ra.Initialize(File.DirInternal,"gamelist",False)
gamelist = ra.ReadObject(0)
gamelist.Invalidate
ra.Close

 

[Erel]

You cannot serialize a ListView. See the supported types: https://www.b4x.com/android/help/randomaccessfile.html#randomaccessfile_writeobject

 

[mohsen nasrabady]

ok thnx but there is no way to save a listview?

 

[Erel]

You cannot save views to a file. You can save the data to a file.

 

[mohsen nasrabady]

i used this code to save the listview with two line and bitmap
the recoglist and recogsize is map
i did the data of two line and bitmap in the maps

For i = 0 To list1.Size-1
gamelist.AddTwoLinesAndBitmap(list1.Get(i),recogsize.Get(list1.Get(i))&" MB",recoglist.Get(list1.Get(i)))
Next
Dim ra As RandomAccessFile
ra.Initialize(File.DirInternal,"gamelist",False)
ra.WriteObject(list1,True,0)
ra.WriteObject(recogsize,True,ra.CurrentPosition)
ra.WriteObject(recoglist,True,ra.CurrentPosition)
ra.Close

but when read with this code the bitmap is null

Dim ra As RandomAccessFile
ra.Initialize(File.DirInternal,"gamelist",False)
list1 = ra.ReadObject(0)
recogsize = ra.ReadObject(ra.CurrentPosition)
recoglist = ra.ReadObject(ra.CurrentPosition)
ra.Close
gamelist.Clear
For i = 0 To list1.Size-1
gamelist.AddTwoLinesAndBitmap(list1.Get(i),recogsize.Get(list1.Get(i))&" MB",recoglist.Get(list1.Get(i)))
Next

every thing is ok just bitmap is null

 

[Erel]

You are writing a List. Not ListView (which you cannot write this way).

 

[mohsen nasrabady]

see the code above i was editing

 

[Erel]

See my answer in post #2.

I recommend you to use KeyValueStore class instead. It does support bitmaps.

 

[mohsen nasrabady]

random acceess file can support map i put the bitmap in the map not write bitmap

thnx for your help

 

[mohsen nasrabady]

i used the class but when reading return error

android.database.sqlite.SQLiteException: unknown error: INTEGER data in nativeGetBlob

For i = 0 To list1.Size-1
Dim ssize As String = recogdata.GetSimple(list1.Get(i))&" MB"
Dim sbitmap As Bitmap = recogdata.GetBitmap(list1.Get(i))
gamelist.AddTwoLinesAndBitmap(list1.Get(i),ssize,sbitmap)
Next

 

[Erel]

Post the code that you use to write the data.