AshuTyagi16

var currentVelocity = 0f

    /**
     * A [SpringAnimation] for this RecyclerView item. This animation rotates the view with a bouncy
     * spring configuration, resulting in the oscillation effect.
     *
     * The animation is started in [Recyclerview.onScrollListener].
     */
    val rotation: SpringAnimation = SpringAnimation(itemView, SpringAnimation.ROTATION)
        .setSpring(

AshuTyagi16

companion object {
        /** The magnitude of rotation while the list is scrolled. */
        private const val SCROLL_ROTATION_MAGNITUDE = 0.25f

        /** The magnitude of rotation while the list is over-scrolled. */
        private const val OVERSCROLL_ROTATION_MAGNITUDE = -10

        /** The magnitude of translation distance while the list is over-scrolled. */
        private const val OVERSCROLL_TRANSLATION_MAGNITUDE = 0.2f

AshuTyagi16

rvApps.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { 
                recyclerView.forEachVisibleHolder { holder: AppViewHolder ->
                    holder.rotation
                        // Update the velocity.
                        // The velocity is calculated by the vertical scroll offset.
                        .setStartVelocity(holder.currentVelocity - dx * SCROLL_ROTATION_MAGNITUDE)
                        // Start the animation. This does nothing if the animation is already running.
                        .start()
                }

AshuTyagi16

inline fun <reified T : RecyclerView.ViewHolder> RecyclerView.forEachVisibleHolder(
    action: (T) -> Unit
) {
    for (i in 0 until childCount) {
        action(getChildViewHolder(getChildAt(i)) as T)
    }
}

AshuTyagi16

import android.content.Context
import android.os.Bundle
import android.os.PowerManager
import androidx.appcompat.app.AppCompatActivity

class ExampleActivity : AppCompatActivity() {

    private lateinit var wakeLock: PowerManager.WakeLock

AshuTyagi16

@SystemService(Context.POWER_SERVICE)
public final class PowerManager {

    final IPowerManager mService;

    public final class WakeLock {
        @UnsupportedAppUsage
        private int mFlags;
        @UnsupportedAppUsage
        private String mTag;

AshuTyagi16

rvChat.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                super.onScrolled(recyclerView, dx, dy)
                recyclerView.forEachVisibleHolder { holder: RecyclerView.ViewHolder ->
                    if (holder is OutgoingChatViewHolder) {
                        changeDrawableColor(holder)
                    }
                }
            }
        })

AshuTyagi16

private fun getFloatRange(view: View): Float {
    return 1f - (view.absY() / resources.displayMetrics.heightPixels.toFloat())
}

//This function returns the y-cord of the view..
fun View.absY(): Float {
    val location = IntArray(2)
    getLocationOnScreen(location)
    return (location[1].toFloat() - height.toFloat())
}

AshuTyagi16

import android.graphics.Color

class AnimatedColor(private val startColor: Int, private val endColor: Int) {

    private val startHSV: FloatArray
    private val endHSV: FloatArray
    private val move = FloatArray(3)


    init {

AshuTyagi16

private fun changeDrawableColor(holder: OutgoingChatViewHolder) {
        holder.itemView.post {
            ContextCompat.getDrawable(this, R.drawable.bg_round_corner_outgoing)
                ?.let { incomingBgDrawable ->
                    val color = animatedColor.with(getFloatRange(holder.itemView))
                    incomingBgDrawable.updateTint(color)
                    holder.itemView.tvOutgoingMessage.background = incomingBgDrawable
                }
        }
    }