B4A Library Preferences - Material Design Preferences

This library provides a framework to create nice looking Material Design Preferences down to API9. It uses this GitHub project to fix some bugs in the android support preferences stuff. It also adds some nice features like simple icon tinting, simple menu list preferences and a color picker.

For a guide on how to implement settings for Material Design read this.

Installation:
  • Extract all of the PreferencesLibX_XX.zip file to your additional libraries folder. These are .xml, .jar, 4 .aar files.
  • Requires AppCompat library.
  • Requires B4A 6.31+
minimum SDK Version: 14
Needs support library 27

If you are updating you can delete the old library aar files.

Your Support:
Creating libraries and wrappers for existing library projects is a lot of work. The use of this library is totally free and you even don't need to mention in your app that you use it.
But if you use this library in your projects and you think it is useful to you please consider to make a donation:

Thanks very much for your support.

Usage:

You need to use AppCompat Library together with this library.
Don't forget to add the Preference library to your project.

1. Enhance your theme in manifest editor
Add a preferenceTheme item and the two items for the IconTint:
B4X:
CreateResource(values, theme.xml,
<resources>
    <style name="MyAppTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
        <item name="colorPrimary">#0098FF</item>
        <item name="colorPrimaryDark">#007CF5</item>
        <item name="colorAccent">#FF5522</item>
        <item name="windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
        <item name="preferenceTheme">@style/PreferenceThemeOverlay.Material</item>
        <item name="asp_preferenceIconTint">?colorAccent</item>
        <item name="asp_preferenceDialogIconTint">?asp_preferenceIconTint</item>
        <item name="windowActionModeOverlay">true</item>
    </style>
</resources>
)

2. Extend from AppCompatPreferenceActivity
B4X:
#Extends: de.amberhome.preferences.AppCompatPreferenceActivity

3. Add PreferenceView to your Layout (with designer or by code)
DesignerPreferenceView.png

4. Load the Layout in Activity_Create() as normal

5. Create your Preference elements in PreferenceView_Ready() event.

See the example for detailed usage.

The example has minSdkVersion set to 14. This is because the MaterialDateTimePicker needs this. The Preference library itself will work with a minimal SDK version of 9.

The example projects additionally needs MaterialDateTimePicker, XMLLayoutBuilder and DateUtils libraries.

Reference:
Preferences
Author:
Markus Stipp
Version: 1.11
  • CheckBoxPreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • Checked As Boolean
    • DefaultValue As Object [write only]
    • Dependency As String
    • DisableDependentsState As Boolean
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • Order As Int
    • Persistent As Boolean
    • Selectable As Boolean
    • Summary As String
    • SummaryOffText As CharSequence
    • SummaryOnText As CharSequence
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean
  • ColorPreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • GetNameForColor (Color As Int) As CharSequence
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • Color As Int
    • ColorNames()() As CharSequence
    • ColorValues()() As Int
    • ColumnCount As Int
    • DefaultValue As Object [write only]
    • Dependency As String
    • DialogIcon As Drawable
    • DialogIconTintEnabled As Boolean [write only]
    • DialogTitle As CharSequence
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • NegativeButtonText As CharSequence
    • Order As Int
    • Persistent As Boolean
    • PositiveButtonText As CharSequence
    • Selectable As Boolean
    • Summary As String
    • SummaryTextColor As Int [write only]
    • SwatchSize As Int
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean
  • EditTextPreference
    Events:
    • EditTextCreated (Edit As EditText)
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • DialogIcon As Drawable
    • DialogIconTintEnabled As Boolean [write only]
    • DialogMessage As CharSequence
    • DialogTitle As CharSequence
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • NegativeButtonText As CharSequence
    • Order As Int
    • Persistent As Boolean
    • PositiveButtonText As CharSequence
    • Selectable As Boolean
    • Summary As String
    • SummaryTextColor As Int [write only]
    • Text As String
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean
  • ListPreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Fields:
    • MENU_MODE_DIALOG As Int
    • MENU_MODE_SIMPLE_ADAPTIVE As Int
    • MENU_MODE_SIMPLE_DIALOG As Int
    • MENU_MODE_SIMPLE_MENU As Int
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • DialogIcon As Drawable
    • DialogIconTintEnabled As Boolean [write only]
    • DialogTitle As CharSequence
    • Enabled As Boolean
    • Entries As Map
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • MenuMode As Int
    • NegativeButtonText As CharSequence
    • Order As Int
    • Persistent As Boolean
    • PositiveButtonText As CharSequence
    • Selectable As Boolean
    • SimpleMenuPreferredWidthUnit As Float
    • Summary As String
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Value As String
    • Visible As Boolean
  • MultiSelectListPreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As List)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As List)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • DialogIcon As Drawable
    • DialogIconTintEnabled As Boolean [write only]
    • DialogTitle As CharSequence
    • Enabled As Boolean
    • Entries As Map
    • Icon As Drawable
    • Intent As Intent
    • Key As String
    • NegativeButtonText As CharSequence
    • Order As Int
    • Persistent As Boolean
    • PositiveButtonText As CharSequence
    • Selectable As Boolean
    • SelectedItems() As Boolean [read only]
    • Summary As String
    • Title As String
    • Values As List
    • Visible As Boolean
  • Preference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • Enabled As Boolean
    • Icon As Drawable
    • Intent As Intent
    • Key As String
    • Order As Int
    • Persistent As Boolean
    • Selectable As Boolean
    • Summary As String
    • Title As String
    • Visible As Boolean
  • PreferenceCategory
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • AddCategory (EventName As String, Key As String, Title As String) As PreferenceCategoryWrapper
    • AddCheckBoxPreference (EventName As String, Key As String, Title As String, SummaryOn As String, SummaryOff As String, Default As Boolean) As CheckBoxPreferenceWrapper
    • AddColorPreference (EventName As String, Key As String, Title As String, Summary As String, Default As Int, Colors() As Int, Names() As String) As ColorPreferenceWrapper
    • AddEditTextPreference (EventName As String, Key As String, Title As String, Summary As String, Default As String) As EditTextPreferenceWrapper
    • AddListPreference (EventName As String, Key As String, Title As String, Summary As String, Default As String, Values() As String, Texts() As String) As ListPreferenceWrapper
    • AddMultiSelectListPreference (EventName As String, Key As String, Title As String, Summary As String, Default As List, Values() As String, Texts() As String) As MultiSelectListPreferenceWrapper
    • AddPreference (Pref As Preference) As Boolean
    • AddSeekBarDialogPreference (EventName As String, Key As String, Title As String, Summary As String, Default As Int, Min As Int, Max As Int) As SeekBarDialogPreferenceWrapper
    • AddSeekBarPreference (EventName As String, Key As String, Title As String, Summary As String, Default As Int, Min As Int, Max As Int) As SeekBarPreferenceWrapper
    • AddSimplePreference (EventName As String, Key As String, Title As String, Summary As String, Default As String) As SimplePreferenceWrapper
    • AddSwitchPreference (EventName As String, Key As String, Title As String, SummaryOn As String, SummaryOff As String, Default As Boolean) As SwitchPreferenceWrapper
    • FindPreference (Key As String) As Preference
    • GetPreference (Index As Int) As Preference
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
    • RemoveAll
    • RemovePreference (Pref As Preference)
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • Order As Int
    • Persistent As Boolean
    • PreferenceCount As Int [read only]
    • Selectable As Boolean
    • Summary As String
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean
  • PreferenceManager
    Methods:
    • ClearAll
      Clears all stored entries.
    • GetAll As Map
      Returns a Map with all the Keys and Values. Note that changes to this map will not affect the stored values.
    • GetBoolean (Key As String) As Boolean
      Returns the Boolean value mapped to the given key. Returns False if the key is not found.
    • GetBoolean2 (Key As String, Default As Boolean) As Boolean
      Returns the Boolean value mapped to the given key. Returns the default value if the key is not found.
    • GetInt (Key As String) As Int
    • GetInt2 (Key As String, Default As Int) As Int
    • GetList (Key As String) As List
    • GetList2 (Key As String, Default As List) As List
    • GetLong (Key As String) As Long
      Returns the Long value mapped to the given key. Returns -1 if the key is not found.
    • GetLong2 (Key As String, Default As Long) As Long
      Returns the Long value mapped to the given key. Returns the default value if the key is not found.
    • GetString (Key As String) As String
      Returns the String value mapped to the given key. Returns an empty string if the key is not found.
    • GetString2 (Key As String, Default As String) As String
      Return the String value mapped to the given key. Returns the default value if the key is not found.
    • GetUpdatedKeys As List
      Returns a list with the keys that were updated since the last call to GetUpdatedKeys.
      Note that the updated keys may include keys with unchanged values.
    • SetBoolean (Key As String, Value As Boolean)
      Maps the given key to the given Boolean value.
    • SetInt (Key As String, Value As Int)
    • SetList (Key As String, Values As List)
      Maps the given key to the given List.
    • SetLong (Key As String, Value As Long)
      Maps the given key to the given Long value.
    • SetString (Key As String, Value As String)
      Maps the given key to the given String value.
  • PreferenceView
    Events:
    • Ready (Preference As PreferenceView)
  • Methods:
    • AddCategory (EventName As String, Key As String, Title As String) As PreferenceCategoryWrapper
    • AddCheckBoxPreference (EventName As String, Key As String, Title As String, SummaryOn As String, SummaryOff As String, Default As Boolean) As CheckBoxPreferenceWrapper
    • AddColorPreference (EventName As String, Key As String, Title As String, Summary As String, Default As Int, Colors() As Int, Names() As String) As ColorPreferenceWrapper
    • AddEditTextPreference (EventName As String, Key As String, Title As String, Summary As String, Default As String) As EditTextPreferenceWrapper
    • AddListPreference (EventName As String, Key As String, Title As String, Summary As String, Default As String, Values() As String, Texts() As String) As ListPreferenceWrapper
    • AddMultiSelectListPreference (EventName As String, Key As String, Title As String, Summary As String, Default As List, Values() As String, Texts() As String) As MultiSelectListPreferenceWrapper
    • AddPreference (Pref As Preference)
    • AddSeekBarDialogPreference (EventName As String, Key As String, Title As String, Summary As String, Default As Int, Min As Int, Max As Int) As SeekBarDialogPreferenceWrapper
    • AddSeekBarPreference (EventName As String, Key As String, Title As String, Summary As String, Default As Int, Min As Int, Max As Int) As SeekBarPreferenceWrapper
    • AddSimplePreference (EventName As String, Key As String, Title As String, Summary As String, Default As String) As SimplePreferenceWrapper
    • AddSwitchPreference (EventName As String, Key As String, Title As String, SummaryOn As String, SummaryOff As String, Default As Boolean) As SwitchPreferenceWrapper
    • DesignerCreateView (base As PanelWrapper, lw As LabelWrapper, props As Map)
    • Initialize (EventName As String, Parent As ViewGroup)
  • SeekBarDialogPreference
  • Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • DialogIcon As Drawable
    • DialogIconTintEnabled As Boolean [write only]
    • DialogMessage As CharSequence
    • DialogTitle As CharSequence
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • Max As Int
    • Min As Int
    • NegativeButtonText As CharSequence
    • Order As Int
    • Persistent As Boolean
    • PositiveButtonText As CharSequence
    • Progress As Int
    • Selectable As Boolean
    • Summary As String
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean
  • SeekBarPreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
    • ProgressChanged (Progress As Int, UserChanged As Boolean)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • Adjustable As Boolean
    • DefaultValue As Object [write only]
    • Dependency As String
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Info As CharSequence
    • Intent As Intent
    • Key As String
    • Max As Int
    • Min As Int
    • Order As Int
    • Persistent As Boolean
    • SeekBarIncrement As Int
    • Selectable As Boolean
    • ShowValue As Boolean
    • Summary As String
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Value As Int
    • Visible As Boolean
  • SimplePreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
    • PreferenceLongClicked (Preference As Preference))
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • DefaultValue As Object [write only]
    • Dependency As String
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • Order As Int
    • Persistent As Boolean
    • Selectable As Boolean
    • Summary As String
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean
  • SwitchPreference
    Events:
    • PreferenceChanged (Preference As Preference, NewValue As Object)
    • PreferenceClicked (Preference As Preference)
  • Methods:
    • Initialize (PreferenceView As PreferenceViewWrapper, EventName As String, Key As String, DefaultValue As Object)
      Initializes the object
    • IsInitialized As Boolean
  • Properties:
    • Checked As Boolean
    • DefaultValue As Object [write only]
    • Dependency As String
    • DisableDependentsState As Boolean
    • Enabled As Boolean
    • Icon As Drawable
    • IconPaddingEnabled As Boolean [write only]
    • IconTintEnabled As Boolean [write only]
    • Intent As Intent
    • Key As String
    • Order As Int
    • Persistent As Boolean
    • Selectable As Boolean
    • Summary As String
    • SummaryOffText As CharSequence
    • SummaryOnText As CharSequence
    • SummaryTextColor As Int [write only]
    • Title As String
    • TitleTextColor As Int [write only]
    • Visible As Boolean

History:
V1.00:
  • Initial version
V1.01:
  • Fix: Change packagename to anywheresoftware.b4a.orbjects to reduce resource fields
V1.10:
  • New: MultiSelectListPreference
V1.11
  • Fix: Removed DialogMessage property from dialogs with lists (not supported)
  • Fix: Added missing properties to MultiSelectPreference
V1.12
  • Fix: PreferenceCategory.AddMultiSelectListPreference() should work now
  • Fix: AddPreference() should work with all preferences
  • New: Added RemoveKey() to PreferenceManager
  • Fix: Remove internal resource files
V1.14
  • Fix: Fix crash on screen rotation
  • Fix: Updated to support-preferences library 1.2.7 (fixes crash with ringtone manager on Samsung devices, fixes memory leak)
  • New: Better support for CharSequences
V2.00
  • Fix: Updated to support-preferences library 2.2.0 (fixes crashes with support libraries 27)
V3.00
  • Fix: Should work with androidx support libraries.
  • Fix: Updated to support-prefernces library 3.0.0dev
  • Attention: Removed RingtonePreference since it is not supported by androidx support library anymore!
ToDo:
  • Currently there is nearly no popup help.
 

Attachments

  • PreferencesLib2_0.zip
    405.7 KB · Views: 537
  • PreferencesExample1_12.zip
    19.7 KB · Views: 438
  • PreferencesLib3_0.zip
    427.2 KB · Views: 546
  • PreferencesExample2_00.zip
    19.8 KB · Views: 322
Last edited:

woniol

Active Member
Licensed User
Longtime User
Hi,

I have the same problem after upgrade to B4A 9.80.
B4X:
activity_preferences_globals (java line: 433)
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/preference/XpPreferenceManager;
    at de.amberhome.preferences.PreferenceManagerWrapper.<init>(PreferenceManagerWrapper.java:21)
    at com.woniol.domeq.activity_preferences._globals(activity_preferences.java:433)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:196)
    at com.woniol.domeq.activity_preferences.initializeGlobals(activity_preferences.java:320)
    at com.woniol.domeq.activity_preferences.afterFirstLayout(activity_preferences.java:101)
    at com.woniol.domeq.activity_preferences.access$000(activity_preferences.java:17)
    at com.woniol.domeq.activity_preferences$WaitForLayout.run(activity_preferences.java:82)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:158)
    at android.app.ActivityThread.main(ActivityThread.java:7224)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.preference.XpPreferenceManager" on path: DexPathList[[zip file "/data/app/com.woniol.domeq-1/base.apk"],nativeLibraryDirectories=[/data/app/com.woniol.domeq-1/lib/arm, /vendor/lib, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

Any ideas how to solve it?
 
Last edited:

woniol

Active Member
Licensed User
Longtime User
I know it is directly related to AndroidX rather then B4A version.
I get the error message using version 3 of PreferencesLib.

It is also with the example from first post.
 
Last edited:

woniol

Active Member
Licensed User
Longtime User
Thats what I meant. It is AndroidX problem not B4A.

Think, I'll have to switch to B4XPreferencesDialog but this will require some additional work.
 

corwin42

Expert
Licensed User
Longtime User
Hi,

I have the same problem after upgrade to B4A 9.80.
B4X:
activity_preferences_globals (java line: 433)
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/preference/XpPreferenceManager;
    at de.amberhome.preferences.PreferenceManagerWrapper.<init>(PreferenceManagerWrapper.java:21)
    at com.woniol.domeq.activity_preferences._globals(activity_preferences.java:433)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:196)
    at com.woniol.domeq.activity_preferences.initializeGlobals(activity_preferences.java:320)
    at com.woniol.domeq.activity_preferences.afterFirstLayout(activity_preferences.java:101)
    at com.woniol.domeq.activity_preferences.access$000(activity_preferences.java:17)
    at com.woniol.domeq.activity_preferences$WaitForLayout.run(activity_preferences.java:82)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:158)
    at android.app.ActivityThread.main(ActivityThread.java:7224)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.preference.XpPreferenceManager" on path: DexPathList[[zip file "/data/app/com.woniol.domeq-1/base.apk"],nativeLibraryDirectories=[/data/app/com.woniol.domeq-1/lib/arm, /vendor/lib, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

Any ideas how to solve it?
I have no idea what you are doing wrong. I can't reproduce the problem.

Which android.jar are you using? Are you sure you have the 3.0 library version installed? Have you jetified everything? Have you tried to clean the project?
 

woniol

Active Member
Licensed User
Longtime User
Hi,

I managed to solve it with the following steps:
1. Fresh install of B4A (9.80)
2. New Additional Libraries folder creation (out of Program Files for permissions)
3. Fresh download of the additional libraries (latest versions) needed for my project.
4. Jetified (Tools - Jetifier)
5. Clean project (Tools - Clean project)
and it works......

So it was definitely related to my installation, which was not refreshed for a long time.
I think it is a good idea to have fresh install after switching to AndroidX.

Thanks for your help
 
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