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FragmentVisibility

Unified fragment visibility library for Android.

Support Fragment usage scenarios:

• Declare the Fragment in the xml file, or dynamically load the Fragment through add or replace in the code.
• Use Fragment in FragmentContainerView/FrameLayout, Use show and hide to control the display and hide Fragment.
• Use Fragment in FragmentContainerView/FrameLayout, Use show and hide to control the display and hide Fragment, and use setMaxLifecycle to control the life cycle of fragment.
• Use Fragment in ViewPager, Behavior is BEHAVIOR_SET_USER_VISIBLE_HINT or BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT.
• Use Fragment in ViewPager2.
• Multi-level nested Fragment.

Download

repositories {
    mavenCentral()
}

dependencies {
    implementation 'cc.taylorzhang:fragment-visibility:1.0.0'
}

Usage

Visibility Callback

class YourFragment : VisibilityFragment() {

    override fun onVisible() {
        super.onVisible()

        // Called when the fragment is visible.
    }

    override fun onInvisible() {
        super.onInvisible()

        // Called when the Fragment is not visible.
    }

    override fun onVisibleFirst() {
        super.onVisibleFirst()

        // Called when the fragment is visible for the first time.
        // You can load data here for lazy loading.
    }

    override fun onVisibleExceptFirst() {
        super.onVisibleExceptFirst()

        // Called when the fragment is visible except first time.
    }
}

Visibility State

class YourFragment : VisibilityFragment() {

    fun yourFunction() {
        if (isVisibleToUser()) {
            // do something
        }
    }
}

License

Apache license 2.0 © Taylor Zhang