Add fun emoji animations when selecting boost level.

app/src/main/java/org/thoughtcrime/securesms/components/settings/app/subscription/boost/Boost.kt

@@ -52,7 +52,7 @@ data class Boost(
     val selectedBoost: Boost?,
     val currency: Currency,
     override val isEnabled: Boolean,
-    val onBoostClick: (Boost) -> Unit,
+    val onBoostClick: (View, Boost) -> Unit,
     val isCustomAmountFocused: Boolean,
     val onCustomAmountChanged: (String) -> Unit,
     val onCustomAmountFocusChanged: (Boolean) -> Unit,
@@ -95,7 +95,7 @@ data class Boost(
           FiatMoneyUtil.formatOptions().trimZerosAfterDecimal()
         )
         button.setOnClickListener {
-          model.onBoostClick(boost)
+          model.onBoostClick(it, boost)
           custom.clearFocus()
         }
       }

app/src/main/java/org/thoughtcrime/securesms/components/settings/app/subscription/boost/BoostFragment.kt

@@ -1,11 +1,13 @@
 package org.thoughtcrime.securesms.components.settings.app.subscription.boost
 
 import android.text.SpannableStringBuilder
+import android.view.View
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.viewModels
 import androidx.navigation.NavOptions
 import androidx.navigation.fragment.findNavController
+import com.airbnb.lottie.LottieAnimationView
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import org.signal.core.util.DimensionUnit
 import org.signal.core.util.logging.Log
@@ -23,6 +25,7 @@ import org.thoughtcrime.securesms.components.settings.app.subscription.models.Cu
 import org.thoughtcrime.securesms.components.settings.app.subscription.models.GooglePayButton
 import org.thoughtcrime.securesms.components.settings.configure
 import org.thoughtcrime.securesms.util.LifecycleDisposable
+import org.thoughtcrime.securesms.util.Projection
 import org.thoughtcrime.securesms.util.SpanUtil
 
 /**
@@ -35,6 +38,13 @@ class BoostFragment : DSLSettingsBottomSheetFragment(
   private val viewModel: BoostViewModel by viewModels(ownerProducer = { requireActivity() })
   private val lifecycleDisposable = LifecycleDisposable()
 
+  private lateinit var boost1AnimationView: LottieAnimationView
+  private lateinit var boost2AnimationView: LottieAnimationView
+  private lateinit var boost3AnimationView: LottieAnimationView
+  private lateinit var boost4AnimationView: LottieAnimationView
+  private lateinit var boost5AnimationView: LottieAnimationView
+  private lateinit var boost6AnimationView: LottieAnimationView
+
   private lateinit var processingDonationPaymentDialog: AlertDialog
 
   private val sayThanks: CharSequence by lazy {
@@ -58,6 +68,13 @@ class BoostFragment : DSLSettingsBottomSheetFragment(
       .setCancelable(false)
       .create()
 
+    boost1AnimationView = requireView().findViewById(R.id.boost1_animation)
+    boost2AnimationView = requireView().findViewById(R.id.boost2_animation)
+    boost3AnimationView = requireView().findViewById(R.id.boost3_animation)
+    boost4AnimationView = requireView().findViewById(R.id.boost4_animation)
+    boost5AnimationView = requireView().findViewById(R.id.boost5_animation)
+    boost6AnimationView = requireView().findViewById(R.id.boost6_animation)
+
     viewModel.state.observe(viewLifecycleOwner) { state ->
       adapter.submitList(getConfiguration(state).toMappingModelList())
     }
@@ -119,8 +136,9 @@ class BoostFragment : DSLSettingsBottomSheetFragment(
           currency = state.customAmount.currency,
           isCustomAmountFocused = state.isCustomAmountFocused,
           isEnabled = state.stage == BoostState.Stage.READY,
-          onBoostClick = {
-            viewModel.setSelectedBoost(it)
+          onBoostClick = { view, boost ->
+            startAnimationAboveSelectedBoost(view)
+            viewModel.setSelectedBoost(boost)
           },
           onCustomAmountChanged = {
             viewModel.setCustomAmount(it)
@@ -196,6 +214,35 @@ class BoostFragment : DSLSettingsBottomSheetFragment(
       }
   }
 
+  private fun startAnimationAboveSelectedBoost(view: View) {
+    val animationView = getAnimationContainer(view)
+    val viewProjection = Projection.relativeToViewRoot(view, null)
+    val animationProjection = Projection.relativeToViewRoot(animationView, null)
+    val viewHorizontalCenter = viewProjection.x + viewProjection.width / 2f
+    val animationHorizontalCenter = animationProjection.x + animationProjection.width / 2f
+    val animationBottom = animationProjection.y + animationProjection.height
+
+    animationView.translationY = -(animationBottom - viewProjection.y) + (viewProjection.height / 2f)
+    animationView.translationX = viewHorizontalCenter - animationHorizontalCenter
+
+    animationView.playAnimation()
+
+    viewProjection.release()
+    animationProjection.release()
+  }
+
+  private fun getAnimationContainer(view: View): LottieAnimationView {
+    return when (view.id) {
+      R.id.boost_1 -> boost1AnimationView
+      R.id.boost_2 -> boost2AnimationView
+      R.id.boost_3 -> boost3AnimationView
+      R.id.boost_4 -> boost4AnimationView
+      R.id.boost_5 -> boost5AnimationView
+      R.id.boost_6 -> boost6AnimationView
+      else -> throw AssertionError()
+    }
+  }
+
   companion object {
     private val TAG = Log.tag(BoostFragment::class.java)
   }

app/src/main/java/org/thoughtcrime/securesms/util/Projection.java

@@ -98,6 +98,18 @@ public final class Projection {
     }
   }
 
+  @Override public String toString() {
+    return "Projection{" +
+           "x=" + x +
+           ", y=" + y +
+           ", width=" + width +
+           ", height=" + height +
+           ", corners=" + corners +
+           ", path=" + path +
+           ", rect=" + rect +
+           '}';
+  }
+
   public @NonNull Projection translateX(float xTranslation) {
     return set(x + xTranslation, y, width, height, corners);
   }