override fun onSaveInstanceState(): Parcelable? {
    Log.d("NavigationBar", "onSaveInstanceState: selectedId=${mSelectedId}")
    return SavedState(super.onSaveInstanceState(), mSelectedId)
}

override fun onRestoreInstanceState(state: Parcelable?) {
    if (state is SavedState) {
        val id = state.selectedId
        Log.d("NavigationBar", "onRestoreInstanceState: selectedId=${state.selectedId}")
        super.onRestoreInstanceState(state.superState)
        select(id)
        return
    }
    return super.onRestoreInstanceState(state)
}

internal class SavedState : BaseSavedState {
    var selectedId: Int = View.NO_ID

    constructor(source: Parcel) : super(source) {
        selectedId = source.readInt()
        Log.d("NavigationBar", "readFromParcel: selectedId=$selectedId")
    }

    constructor(superState: Parcelable?, selectedId: Int) : super(superState) {
        this.selectedId = selectedId
    }

    override fun writeToParcel(parcel: Parcel, flags: Int) {
        super.writeToParcel(parcel, flags)
        parcel.writeInt(selectedId)
        Log.d("NavigationBar", "writeToParcel: selectedId=$selectedId")
    }

    override fun describeContents(): Int {
        return 0
    }

    companion object CREATOR : Parcelable.Creator<SavedState> {
        override fun createFromParcel(parcel: Parcel): SavedState {
            return SavedState(parcel)
        }

        override fun newArray(size: Int): Array<SavedState?> {
            return arrayOfNulls(size)
        }
    }
}

import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import android.widget.ScrollView

class ItemScrollView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : ScrollView(context, attrs, defStyleAttr) {

    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
        parent.requestDisallowInterceptTouchEvent(true)
        return super.onInterceptTouchEvent(ev)
    }

    private var lastY: Float = 0f

    override fun onTouchEvent(ev: MotionEvent?): Boolean {
        when (ev?.action) {
            MotionEvent.ACTION_DOWN -> {
                lastY = ev.y
            }

            MotionEvent.ACTION_MOVE -> {
                val currentY = ev.y
                this.scrollBy(0, (lastY - currentY).toInt())
                lastY = currentY
            }

            MotionEvent.ACTION_UP -> {
                lastY = 0f
            }
        }

        return canScroll()
    }

    private fun canScroll(): Boolean {
        val child = getChildAt(0)
        child?.let {
            return height < child.height
        }
        return false
    }
}

// 解决不同机型版本兼容问题，onKeyDown 可能被拦截
setOnKeyListener { dialog, keyCode, event ->
 Log.d(TAG, "setOnKeyListener: keyCode = $keyCode, event = $event")
 if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
     handleKeyEvent(keyCode)
     true
 } else {
     false
 }
}

override fun onPause() {
    KeyBoardUtils.hideKeyboard(binding.etSearch)
    super.onPause()
}

override fun onDismiss(dialog: DialogInterface) {
    listener?.onDialogDismiss()
    super.onDismiss(dialog)
}

// 消除弹框遗留下来的keyboard
private fun onDialogDismiss() {
    // 消除弹框
    Handler().postDelayed({
        KeyBoardUtils.hideKeyboard(binding.root)
    }, 200)
}

import android.content.res.Resources
import android.graphics.Rect
import android.util.TypedValue
import android.view.View
import androidx.recyclerview.widget.RecyclerView

class SimplePaddingDecoration(
    spaceDp: Int,
    val orientation: Int = RecyclerView.VERTICAL
) : RecyclerView.ItemDecoration() {
    private val dividerHeight: Int = TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_DIP,
        spaceDp.toFloat(),
        Resources.getSystem().displayMetrics
    ).toInt()

    override fun getItemOffsets(
        outRect: Rect,
        view: View,
        parent: RecyclerView,
        state: RecyclerView.State
    ) {
        val position = (view.layoutParams as RecyclerView.LayoutParams).viewLayoutPosition

        if (orientation == RecyclerView.VERTICAL) {
            // 竖直
            if (position + 1 != parent.adapter?.itemCount) {
                outRect.set(0, 0, 0, dividerHeight)
            } else {
                outRect.set(0, 0, 0, 0)
            }
        } else {
            // 水平
            if (position + 1 != parent.adapter?.itemCount) {
                outRect.set(0, 0, dividerHeight, 0)
            } else {
                outRect.set(0, 0, 0, 0)
            }
        }
    }
}