B4J Question Writing views in lists to file. How?

Marc De Loose · Monday at 1:54 PM

Hi,

I am trying to write a list containing custom views to a file.
File.WriteList("./", "Test.txt", lst_xRotateKnobs)
lst_xRotateKnobs = File.ReadList("./", "Test.txt")

does not give the correct results.

What is the best way to save my list containing customview (class module)?

thx

Sagenut · Monday at 2:00 PM

You can check this discussion.
Read it all.
https://www.b4x.com/android/forum/threads/map-and-list-saved-to-file.162983/#content
Not sure that views can be serialised.

Marc De Loose · Monday at 2:42 PM

Tried this:

B4X:

Dim kvs As KeyValueStore
    kvs.Initialize("./","test.dat")
    kvs.Put("1",lst_xRotateKnobs)

lst_xRotateKnobs is a list
But it gave me a java error (keyvaluestore). Cannot serialize object.

epiCode · Monday at 2:47 PM

Use file.writelist function

teddybear · Monday at 2:56 PM

Marc De Loose said:
Tried this:

B4X:

Dim kvs As KeyValueStore kvs.Initialize("./","test.dat") kvs.Put("1",lst_xRotateKnobs)

lst_xRotateKnobs is a list
But it gave me a java error (keyvaluestore). Cannot serialize object.

kvs should put an object for list.

B4X:

kvs.PutObject("1",lst_xRotateKnobs)

Marc De Loose · Monday at 3:27 PM

teddybear said:
kvs should put an object for list.

B4X:

kvs.PutObject("1",lst_xRotateKnobs)

There is no PutObject

teddybear · Monday at 4:07 PM

Marc De Loose said:
Tried this:

B4X:

Dim kvs As KeyValueStore kvs.Initialize("./","test.dat") kvs.Put("1",lst_xRotateKnobs)

lst_xRotateKnobs is a list
But it gave me a java error (keyvaluestore). Cannot serialize object.

Which version is the kvs you are using?

Marc De Loose · Monday at 6:04 PM

teddybear said:
Which version is the kvs you are using?

The internal library one.

LucaMs · Monday at 7:21 PM

Marc De Loose said:
I am trying to write a list containing custom views to a file.

What do you mean? What does lst_xRotateKnobs contain? I guess xRotaryKnob views. If so, I don't think you can do that.
You can save data about the views, their state. You could create a custom type (declared in B4XMainPage or Main Activity) and use serialization to save the variable of this type, even a List of containing variables of this type.

LucaMs · Monday at 8:09 PM

LucaMs said:
What do you mean? What does lst_xRotateKnobs contain? I guess xRotaryKnob views. If so, I don't think you can do that.
You can save data about the views, their state. You could create a custom type (declared in B4XMainPage or Main Activity) and use serialization to save the variable of this type, even a List of containing variables of this type.

B4J example attached (TextFields instead of xRotaryKnobs but the concept is the same)

Marc De Loose · Wednesday at 3:04 PM

LucaMs said:
B4J example attached (TextFields instead of xRotaryKnobs but the concept is the same)

Thx I still need to look at it. First finishing the base code first:

DonManfred · Wednesday at 3:26 PM

Marc De Loose said:
What is the best way to save my list containing customview (class module)?

You can not store Objects or read Objects back.

All you can do is to save the data you need to create a new instance of the Object and create a new instance setting all values that you have set before.

See LucaMS Answers about a customtype you can use to realize it.

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