在活动之间导航时重置运动布局 [英] Motion Layout reset on navigating between activities

问题描述

我在mainactivity中使用动作布局。它工作正常。但是，当我移到其他活动并导航回我的mainactivity时，有时会重置该活动并且布局处于开始状态。如何防止这种情况发生？除了这笔
之外，我还有一个关于动作布局的问题，我已经问过这里

I am using motion layout in my mainactivity. It is working proplerly. However when I move to other activities and navigate back to my mainactivity sometimes the activity is reset and the layout is in its starting state.How do I keep this from happening ? Apart from this I also have another question about motion layout which I have asked here

推荐答案

class ExtMotionLayout : MotionLayout {
    constructor(context: Context) : super(context)
    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    override fun onSaveInstanceState(): Parcelable? {
        return SavedState(progress, super.onSaveInstanceState())
    }

    override fun onRestoreInstanceState(state: Parcelable?) {
        if (state is SavedState) {
            progress = state.progress
            super.onRestoreInstanceState(state.superState)
        } else super.onRestoreInstanceState(state)
    }

    class SavedState : BaseSavedState {
        val progress: Float

        constructor(progress: Float, source: Parcelable?) : super(source) {
            this.progress = progress
        }

        constructor(superState: Parcel) : super(superState) {
            progress = superState.readFloat()
        }

        override fun writeToParcel(out: Parcel, flags: Int) {
            super.writeToParcel(out, flags)
            out.writeFloat(progress)
        }
    }
}

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