lateinit property initialState has not been initialized in leandroBorgesFerreira Loading Button Android

Explanation of the problem

The user encountered a problem with the CircularProgressButton library in Android. The user attempted to call the startAnimation() method in the onCreate() method, but received the following error: “lateinit property initialState has not been initialized.”

The code block below demonstrates the user’s implementation in the MainActivity class:

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button.startAnimation()
    }
}

The user also provided the associated XML layout file, which shows that the CircularProgressButton is being used in the layout.

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	tools:context=".MainActivity">

	<br.com.simplepass.loadingbutton.customViews.CircularProgressButton
		android:id="@+id/button"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:text="Hello World!"
		app:layout_constraintBottom_toBottomOf="parent"
		app:layout_constraintLeft_toLeftOf="parent"
		app:layout_constraintRight_toRightOf="parent"
		app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

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Problem solution for lateinit property initialState has not been initialized in leandroBorgesFerreira Loading Button Android

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // This will manually initialize the 'initialState' field
        button.saveInitialState()

        button.startAnimation()
    }
}

Other popular problems with Loading Button Android

Problem: Incompatible version of AndroidX issue

Another common issue faced while using Loading Button Android is compatibility with different versions of AndroidX. This can result in the absence of required libraries or compatibility errors while building the project.

Solution:

To resolve this issue, it is recommended to use the latest version of Loading Button Android, which has been tested and verified to work with the latest version of AndroidX.

dependencies {
    implementation 'br.com.simplepass:loading-button-android:2.1.3'
}

Problem: Customization of button behavior issue

Loading Button Android provides a default behavior for the button, but there may be instances where the default behavior does not meet the requirement. In such cases, customizing the button behavior can be a challenge.

Solution:

To resolve this issue, Loading Button Android provides a set of methods that can be overridden to implement custom behavior. Additionally, Loading Button Android provides a set of attributes that can be set in the XML file to customize the appearance of the button.

<br.com.simplepass.loadingbutton.customViews.CircularProgressButton
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

Problem: Circular animation may not always render correctly when the button is resized

This can happen because the CircularProgressButton view uses a custom drawable to display the animation, which may not automatically adjust its size and position as the button’s dimensions change. This can result in a misaligned or incomplete animation that does not cover the entire button.

Solution:

To resolve this issue, it is recommended to manually re-position and re-size the custom drawable whenever the button is resized. This can be done by listening for size changes on the button, and then calling an appropriate method to update the custom drawable. For example:

button.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
    override fun onGlobalLayout() {
        button.viewTreeObserver.removeOnGlobalLayoutListener(this)
        button.updateProgressBackgroundSize()
    }
})

A brief introduction to Loading Button Android

Loading Button Android is a custom view library for Android platform that enables developers to add circular progress animation to buttons. The library is designed to provide an attractive and customizable animation for the buttons in an Android app. The loading button library is built with Kotlin and AndroidX, making it suitable for modern Android development.

The library offers several customization options to suit the needs of different Android apps. Developers can control the start and end angle of the animation, the size of the loading circle, the color of the loading circle, the color of the text inside the button, and the text size. Additionally, developers can add custom animations to the button and control the speed of the animation. The library also provides support for saving the initial state of the button and restoring it later, which can be useful in cases where the state of the button changes frequently.

Most popular use cases for Loading Button Android

1. Customizing UI Components: Loading Button Android allows developers to customize various aspects of the UI components, such as the button shape, color, size, and text. This can be done by accessing various properties of the Loading Button class, such as the buttonWidth, buttonHeight, and buttonText properties.

val loadingButton = LoadingButton(this)
loadingButton.buttonWidth = 200
loadingButton.buttonHeight = 50
loadingButton.buttonText = "Submit"

2. Implementing Loading States: Loading Button Android provides support for implementing loading states within the button. This can be done by setting the loading state of the button, which will change its appearance to indicate that the button is currently in the process of performing a task. The loading state can be set using the setLoading(isLoading: Boolean) method.

loadingButton.setLoading(true)
// Perform background task
loadingButton.setLoading(false)

loadingButton.setOnClickListener {
    // Perform action on button click
}