B4A Library [Class] SearchView - More powerful alternative to AutoCompleteEditText

Edit: better to use B4XDialog + B4XSearchTemplate

SearchView is made of an EditText and ListView. When the user enters text into the EditText the ListView shows the items that start with this text or that contain the text (in this order).

This view is useful for allowing the user to select an item from many items.

Advantages over AutoCompleteEditText:

• SearchView uses an internal index that is built when you call SetItems. This allows it to quickly find the matches.
• SearchView also shows items that contain the input text (not just prefixes).
• The class code can be further customized as needed.

Tutorial about handling large, searchable lists: https://www.b4x.com/android/forum/t...e-list-with-searchview-b4xserializator.61872/

 

[tcgoh]

Your code looks correct (assuming that you only use it to test this functionality). Which error do you get?

Hi Erel,

Yes, I only use it to test the code.
No, I didn't get any error message in the Log, But I also did not get any search display on the "SV" when text was enter.

Here's my full code

Sub Process_Globals
    Dim index As Object
    Dim newObj As Object
End Sub

Sub Globals
    Dim sv As SearchView
    Dim Panel1 As Panel
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("1")
    sv.Initialize(Me, "sv")
    sv.AddToParent(Panel1, 0, 0, Panel1.Width, Panel1.Height)
  
    Dim raf As RandomAccessFile
    raf.Initialize(File.DirRootExternal, "test.txt", False)
    raf.WriteObject(index, True, 0)
    newObj = raf.ReadObject(0)
    raf.Close
    Return newObj
  
    sv.SetIndex(newObj)
End Sub

 

[Erel]

You are writing an empty index to a file and then reading it. You should first build the index and only then you can save it to a file.

 

[tcgoh]

Sorry can you show me how to build the index from the "test.txt" file and then saving it.
Tks

 

[Erel]

1. Create the index by calling index = sv.SetItems(...).

2. Save index with RandomAccessFile.WriteObject. Save it to the File.DirRootExternal.

3. Copy the index file from the device and add it to the IDE.

4. Change your program to read the index from the assets folder and set it with sv.SetIndex.

 

[Mahares]

By storing the index in a file and retrieving it from the file, what happened if you add new items to your list. I am guessing they will not be indexed , hence do not show up when searched for. Could you please confirm or refute my assumption.

 

[Erel]

It will not work properly if the index and list items do not match.

However if you have a large static list and a smaller dynamic list and you understand the code then it should be possible to combine the index results with a linear search over the dynamic items.

 

[aldomoscarda]

I love SearchView but may help to use in BD. This is my incomplete code:

Sub Activity_Create(FirstTime As Boolean)
'Do not forget to load the layout file created with the visual designer. For example:
'Activity.LoadLayout("cuarto")
Activity.Color = Colors.white
sv.Initialize(Me, "sv")
Label1.Initialize("label1")
sv.AddToParent(Activity, 0, 0, 200dip, 300dip)

If FirstTime Then
'******************************************************************************************
If File.Exists(File.DirInternal, "DATOS.db") = True Then
If SQL1.IsInitialized = False Then
SQL1.Initialize(File.DirInternal, "DATOS.db",True )
End If
Dim Cursor As Cursor
Cursor = SQL1.ExecQuery("SELECT * FROM PRODUCTOS WHERE PRD_NOMBRE LIKE'" & Label1.Text.Trim.ToUpperCase & "%' Group BY PRD_NOMBRE")
End If
'******************************************************************************************
Else
' sv.SetIndex(index)
End If

End Sub
Sub sv_ItemClick(Value As String)
Msgbox("Chosen value: " & Value, "")
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

 

[Tomas Petrus]

Hi,

Is there any way how to use this SearchView with more than 100 rows in text file? Replace ListView with something else?

Thanks for replay

 

[Erel]

There is no limit to the number of items.

 

[Tomas Petrus]

Yeah I saw it somewhere and it is nonsense. Problem is somewhere else. I started new thread for it - https://www.b4x.com/android/forum/threads/problem-with-downloading-txt-file-with-httputils2.53114/

 

[jinxaw]

Hi,

what code do i have to add, in order to use the Searchview in combination with the Designer? Could someone help me please?
Thank you very much!

Best regards,
Daniel

 

[Erel]

It is not implemented as a designer custom view. You can read more information about this feature: Custom View with Designer Support

You can add the panel with the designer and then add SearchView to this panel.

 

[merlin2049er]

Can I add this view via the designer? I tried using a custom view and setting it to a search view. Not sure about the custom property?

Thanks,
Joe

 

[Erel]

Currently no.

 

[arnold steger]

When click a button then open a listview and at top is the edittext from sv
when click the button then stopped the programm.
not find my problem, need help

Sub NamenButton_Click
NamenList.Initialize
    Namen.Initialize("Namen")
    For i = 1 To Namen_ListeGross.Size-1
    Dim PointsTempG() As String = Regex.Split(",",Namen_ListeGross.Get(i))
    Namen.AddSingleLine(PointsTempG(2)&","&PointsTempG(0)&","&PointsTempG(1)&",")
    NamenList.Add(PointsTempG(2))
    Next
    For i = 1 To Namen_ListeKlein.Size-1
    Dim PointsTempK() As String = Regex.Split(",",Namen_ListeKlein.Get(i))
    Namen.AddSingleLine(PointsTempK(2)&","&PointsTempK(0)&","&PointsTempK(1)&",")
    NamenList.Add(PointsTempK(2))
    Next
 
    Activity.AddView(Namen, 0, 50dip, 100%x, 100%y-100dip)
    ToastMessageShow(Namen.Size & " Flurnamen gefunden", True)
 
    svN.Initialize(Me, "svN")
    svN.AddToParent(Activity, 0, 0, 200dip, 300dip)
    index=svN.SetItems(NamenList)
'    svN.SetIndex(index,NamenList)
End Sub

Error occurred on line: 53 (searchview)
java.lang.RuntimeException: Object should first be initialized (ListView).

at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:49)
at anywheresoftware.b4a.objects.ListViewWrapper.Clear(ListViewWrapper.java:197)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at anywheresoftware.b4a.objects.EditTextWrapper$1.afterTextChanged(EditTextWrapper.java:83)
at android.widget.TextView.sendAfterTextChanged(TextView.java:7626)
at android.widget.TextView.setText(TextView.java:3859)
at android.widget.TextView.setText(TextView.java:3708)
at android.widget.EditText.setText(EditText.java:81)
at android.widget.TextView.setText(TextView.java:3683)
at android.widget.TextView.setTransformationMethod(TextView.java:1755)
at android.widget.TextView.applySingleLine(TextView.java:7307)
at android.widget.TextView.setInputType(TextView.java:4075)
at anywheresoftware.b4a.objects.EditTextWrapper.setInputType(EditTextWrapper.java:174)
at com.Flurnamenkarte.Gemeinde.Kiens.searchview._initialize(searchview.java:85)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at com.maximus.quickpopup.quickpopup$1.onItemClick(quickpopup.java:85)
at com.maximus.quickpopup.quickpopup$3.onClick(quickpopup.java:161)
at android.view.View.performClick(View.java:4463)
at android.view.View$PerformClick.run(View.java:18789)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5299)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
at dalvik.system.NativeStart.main(Native Method)

 

[Erel]

Hard to say without seeing the project. Please start a new thread for this and upload the project (File - Export as zip).

 

[arnold steger]

i can send a email whit 8,8MB?

 

[Erel]

I'm afraid no. Try to reproduce it in a small project.

 

[Lee Gillie CCP]

This is wonderful. I am adapting a bit for my purposes. I have a list of class of products, with part #, description, price, etc. I am intending to use two searchviews for invoice line item detail input page. One searchview on a product # input for the line item, and another searchview on description input for the line item. So the user can searchview on EITHER product # or description on the line item detail edit page. The searchview list displayed to the user in both cases will show BOTH part # and description, but essentially they are picking a product class record. There are about 1,000 items in my products list. I believe I can see how to customize SearchView to fit the design above.

As I was studying the code, though, there is a MAP called noDuplicates. I was curious why a Map was used for this instead of a List? Is the key searching for a Map faster than using IndexOf on a List? I could see no purpose for the map item value. It is always set to an empty string. And seems like the List might be more resource efficient? Perhaps IndexOf doesn't work the way I picture it in my mind. Perhaps the Map key search is quicker?

 

[Erel]

Is the key searching for a Map faster than using IndexOf on a List?

Yes. It is much faster and it is doesn't require more resources. List.IndexOf needs to go over all the items to see whether there is a duplicate or not.

With a Map it is more or less a single check based on the hashcode.