marcinmoskala / preferenceholder Goto Github PK
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License: Apache License 2.0
SharedPreference usage made fun in Kotlin
License: Apache License 2.0
Hi,
i use below line to add product (data class) to cart in sharedpreference:
var CartItems: ArrayList<ResDataClass.Companion.Product> by bindToPreferenceField(arrayListOf())
when app is alive CartItems has values
but after restarting app CartItems goes Empty
everything except arraylist in sharedpreference has value
something's wrong in saving arrays in sharedpreference
plz fix it
thanks
I love this implementation of a Preference wrapper, but I find myself using Preference change listeners sometimes and would like to know if this is something you've considered adding functionality for.
These are my models
data class IChapter<T>(
var _id: String,
var title: String,
var picture: T,
var createdAt: Long,
var updatedAt: Long
)
data class IMedia(
var _id: String,
var name: String,
var extension: String,
var path: String,
var size: Long,
var createdAt: Long,
var updatedAt: Long
)
I want to save this in prefrences.
object prefs : PreferenceHolder() {
var chapters: List<IChapter<IMedia>> by bindToPreferenceField(listOf())
}
After i populate it with objects coming from this
fun getRemoteChapters(): List<IChapter<IMedia>> = listOf(
IChapter("1", "در تنهایی و ...", IMedia("1", "f1", "jpg", "https://images.all-free-download.com/images/wallpapers_large/small_island_wallpaper_beaches_nature_wallpaper_1388.jpg", 0, 0, 0), 0, 0),
IChapter("2", "پیش از جکومت", IMedia("2", "f2", "jpg", "https://besthqwallpapers.com/Uploads/22-11-2017/29941/thumb2-sea-landscape-waves-beach-sand-clouds.jpg", 0, 0, 0), 0, 0),
IChapter("3", "تا رهایی", IMedia("3", "f3", "jpg", "https://earthporm.com/wp-content/uploads/2014/08/small-man-grand-nature-landscape-photography-62.jpg", 0, 0, 0), 0, 0)
)
If i close and open my app i get class cast error as below
java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to ir.yooneskh.alisotries.database.models.IMedia
Am i doing anything wrong?
I'm using Android Studio 3.0 + kotlin.
// build.gradle
compile "com.marcinmoskala.PreferenceHolder:preferenceholder:1.5"
compile "com.marcinmoskala.PreferenceHolder:preferenceholder-gson-serializer:1.5"
// class App : Application()
override fun onCreate() {
super.onCreate()
PreferenceHolder.setContext(applicationContext)
PreferenceHolder.serializer = GsonSerializer(Gson())
}
class User(name: String, age: Int = 0) {
var name: String? = name
var age: Int? = age
}
object AppPreference : PreferenceHolder() {
var users: List<User>? by bindToPreferenceFieldNullable()
}
// add
val users: ArrayList<User> = ArrayList()
for (i in (0..5)) {
users.add(User("name" + i, i))
}
AppPreference.users = users
// get
Log.i("###", AppPreference.users.toString())
// => [{age=0.0, name=name0}, {age=1.0, name=name1}, {age=2.0, name=name2}, {age=3.0, name=name3}, {age=4.0, name=name4}, {age=5.0, name=name5}]
for (user in AppPreference.users!!) {
Log.i("@@@", user.name)
}
// => java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to kr.susemi99.testkotlin.model.User
val users = Gson().fromJson<List<User>>(AppPreference.users)
val users: List<User> = Gson().fromJson(AppPreference.users)
// => compile error
val usersType = object : TypeToken<List<User>>() {}.type
val users = Gson().fromJson<List<User>>(AppPreference.users, usersType)
// => compile error
Please add some more detailed instructions for beginners.
My app is reporting this error.
I have a lot of values but only in this case the problem occur.
Could someone help me? Thsnks.
java.lang.Error:
at com.marcinmoskala.kotlinpreferences.PreferenceHolder$Companion.getPreferencesOrThrowError$preferenceholder_release (PreferenceHolder.kt:86)
at com.marcinmoskala.kotlinpreferences.bindings.PreferenceFieldBinder.readValue (PreferenceFieldBinder.kt:39)
at com.marcinmoskala.kotlinpreferences.bindings.PreferenceFieldBinder.getValue (PreferenceFieldBinder.kt:22)
at com.marcinmoskala.kotlinpreferences.bindings.PreferenceFieldBinder.getValue (PreferenceFieldBinder.kt:12)
at app.package.utils.helpers.ApplicationPreference.getHomeGridElements (PreferencesHelper.kt)
at app.package.modules.home.HomeFragment.onCreate (HomeFragment.kt:62)
at android.support.v4.app.Fragment.performCreate (Fragment.java:2328)
at android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManager.java:1379)
at android.support.v4.app.FragmentTransition.addToFirstInLastOut (FragmentTransition.java:1188)
at android.support.v4.app.FragmentTransition.calculateFragments (FragmentTransition.java:1071)
at android.support.v4.app.FragmentTransition.startTransitions (FragmentTransition.java:115)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether (FragmentManager.java:2379)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute (FragmentManager.java:2337)
at android.support.v4.app.FragmentManagerImpl.execPendingActions (FragmentManager.java:2244)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange (FragmentManager.java:3255)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated (FragmentManager.java:3205)
at android.support.v4.app.FragmentController.dispatchActivityCreated (FragmentController.java:195)
at android.support.v4.app.FragmentActivity.onStart (FragmentActivity.java:597)
at android.support.v7.app.AppCompatActivity.onStart (AppCompatActivity.java:177)
at app.package.modules.base.BaseActivity.onStart (BaseActivity.kt:25)
at android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1270)
at android.app.Activity.performStart (Activity.java:6689)
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2622)
at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12 (ActivityThread.java)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1473)
at android.os.Handler.dispatchMessage (Handler.java:102)
at android.os.Looper.loop (Looper.java:154)
at android.app.ActivityThread.main (ActivityThread.java:6123)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:757)
PreferenceHelper.kt:
object ApplicationPreference : PreferenceHolder() {
var homeGridElements: Int by bindToPreferenceField(2)
}
HomeFragment.kt
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
...
gridItemDecoration = GridSpacingItemDecoration(ApplicationPreference.homeGridElements, getActivityContext()?.resources?.getDimensionPixelSize(R.dimen.dm_grid_margin) ?: 0, false)
}
what is the key string that created automatically for declaring new preference (without specifying it)?
var useTestAutoCapture: Boolean by bindToPreferenceField(false)
I know I could put it like this and have it:
var useTestAutoCapture: Boolean by bindToPreferenceField(false, "useTestAutoCapture")
but let's say I didn't, released a version and need to know this string (to use in preferences activity for example)
I couldn't find the answer for it, even on debug
I use this library to save any type of object
in PreferenceFieldBinder you got this line of code:
override fun setValue(thisRef: PreferenceHolder, property: KProperty<*>, value: T) {
if (value == field) return
meaning that if I change object and try to save it again it not saved
What is the difference from the KotlinPreferences lib? which one should I use?
The "full example" and "usage" links in README.md are broken.
// Single level collections are also supported if serializer is set. See: Gson serialization
https://github.com/Kotlin/kotlinx.serialization
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