add adaptive icon

android/app/src/main/res/drawable-v24/ic_launcher_background.xml

@@ -0,0 +1,24 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+  <path
+      android:pathData="M-0,0h512v512h-512z"
+      android:strokeLineJoin="round"
+      android:strokeWidth="2.4132"
+      android:strokeLineCap="round">
+    <aapt:attr name="android:fillColor">
+      <gradient 
+          android:startX="383.99"
+          android:startY="477.7"
+          android:endX="128"
+          android:endY="34.3"
+          android:type="linear">
+        <item android:offset="0" android:color="#FF8F2A85"/>
+        <item android:offset="1" android:color="#FF2570B6"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+</vector>

android/app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,20 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+  <group android:scaleX="0.61"
+      android:scaleY="0.61"
+      android:translateX="99.84"
+      android:translateY="99.84">
+    <path
+        android:pathData="m460.13,144.59c-0.34,-0.02 -0.68,0.03 -1.01,0.16l-14.66,5.5v8.11l12.83,-6.02v209.41h-12.83v5.24h15.44c1.57,0 2.62,-1.05 2.88,-2.62v-216.21s0,-0.26 -0.26,-0.52v-1.31c-0.39,-0.98 -1.37,-1.67 -2.39,-1.73zM51.99,145.89c-0.43,0.03 -0.82,0.16 -1.21,0.42 -0.79,0.26 -1.31,1.31 -1.31,2.1v216.21c0,1.57 1.05,2.62 2.62,2.62h15.44v-5.24h-12.56v-209.41l12.56,5.76v-7.07l-11.26,-3.93 -2.88,-1.31c-0.52,-0.13 -0.98,-0.19 -1.41,-0.16zM116.22,167v5.76l1.57,0.79 12.3,7.85 -9.95,-4.45h-0.26l-3.66,-2.09v192.66h2.36c0.79,0 1.31,-0.26 2.09,-0.79 0.79,-0.52 135.33,-59.42 135.33,-59.42s136.9,59.94 137.69,60.21c0.79,0.26 2.88,0 2.88,0v-191.87l-23.82,10.47 12.56,-7.85 11.26,-4.45v-5.5l-13.09,4.97c-0.26,0 -0.26,0.26 -0.52,0.26 0,0 -44.76,27.48 -45.55,28.01 -0.79,0.52 -1.57,1.31 -1.57,2.36v14.92l-43.19,25.65c-0.79,0.26 -1.31,1.31 -1.31,2.09l-0.26,12.56 -23.56,13.87c-1.31,0.79 -0.79,2.62 -0.79,3.93v28.53l-9.95,-3.66c-0.52,-0.26 -1.31,-0.26 -1.83,0l-8.9,3.66v-28.53c0,-1.57 0.26,-2.88 -1.05,-3.67l-23.56,-13.87 -0.26,-12.56c0,-0.79 -0.52,-1.57 -1.31,-2.09l-42.93,-25.39v-15.44c0,-1.05 -0.52,-1.83 -1.57,-2.36l-3.4,-1.57 -51.57,-31.15c-0.26,0 -0.26,-0.26 -0.52,-0.26l-3.66,-1.57zM121.45,183.23 L168.57,204.17 171.45,205.74v132.19l-8.9,3.93v-51.83c0,-1.31 -0.78,-2.36 -2.09,-2.62l-25.39,-4.45c-0.79,-0.26 -1.57,-0 -2.1,0.52 -0.79,0.52 -1.05,1.31 -1.05,2.09v69.89l-10.47,4.71v-176.95zM391.06,183.49v176.95l-11.26,-4.97v-70.41c0,-0.79 -0.52,-1.57 -1.05,-2.09 -0.52,-0.52 -1.31,-0.79 -2.1,-0.52l-25.39,4.45c-1.31,0.26 -2.09,1.31 -2.09,2.62v52.35l-7.85,-3.4 -0.26,-132.45 50,-22.51zM128.16,202.95c-0.49,-0.02 -0.98,0.1 -1.47,0.43 -0.52,0.52 -1.05,1.31 -1.05,2.09v19.37c0,1.31 0.78,2.36 1.83,2.62l14.4,4.19h0.79c0.52,0 1.05,-0.26 1.57,-0.52 0.79,-0.52 1.05,-1.31 1.05,-2.09v-18.32c0,-1.05 -0.78,-2.09 -1.83,-2.36l-14.4,-5.23c-0.29,-0.1 -0.59,-0.16 -0.88,-0.17zM384.62,202.95c-0.29,0.01 -0.59,0.07 -0.88,0.17l-14.4,5.23c-1.05,0.26 -1.83,1.31 -1.83,2.36v18.32c0,0.79 0.26,1.57 1.05,2.09 0.52,0.26 1.05,0.52 1.57,0.52h0.79l14.4,-4.19c1.05,-0.52 1.83,-1.57 1.83,-2.62v-19.37c0,-0.79 -0.26,-1.57 -1.05,-2.09 -0.49,-0.33 -0.98,-0.45 -1.47,-0.43zM130.88,208.88 L140.05,212.28v13.09l-9.16,-2.62v-13.87zM381.91,209.4v13.61l-9.16,2.62v-13.09l9.16,-3.14zM151.73,210.54c-0.49,-0.02 -0.98,0.1 -1.47,0.43 -0.52,0.52 -1.05,1.31 -1.05,2.1v19.37c0,1.31 0.79,2.36 1.83,2.62l14.66,3.93h0.79c0.52,0 1.05,-0.26 1.57,-0.52 0.79,-0.52 1.05,-1.31 1.05,-2.1v-18.06c0,-1.05 -0.79,-2.09 -1.83,-2.36l-14.66,-5.24c-0.29,-0.1 -0.59,-0.16 -0.88,-0.17zM361.07,210.54c-0.29,0.01 -0.59,0.07 -0.88,0.17l-14.4,5.24c-1.05,0.26 -1.83,1.31 -1.83,2.36v18.06c0,0.79 0.52,1.57 1.05,2.1 0.52,0.26 1.05,0.52 1.57,0.52h0.79l14.4,-3.93c1.05,-0.52 1.83,-1.31 1.83,-2.62v-19.37c0,-0.79 -0.26,-1.57 -1.05,-2.1 -0.49,-0.33 -0.98,-0.45 -1.47,-0.43zM154.45,216.73 L163.88,220.14v12.83l-9.42,-2.62v-13.61zM358.36,216.73v13.61l-9.16,2.62v-12.83l9.16,-3.4zM335.85,224.85v3.4l-22.51,9.95 22.51,-13.35zM176.96,225.37 L195.55,236.36 176.96,228.25v-2.88zM176.96,233.75 L215.44,250.76v67.79l-8.9,3.93 -0.26,-24.87c0,-1.31 -0.78,-2.09 -1.83,-2.36l-15.44,-2.36c-0.79,0 -1.31,-0 -1.83,0.52s-0.79,1.05 -0.79,1.83l0.26,35.86 -9.69,4.19v-101.56zM335.85,233.75v101.82l-10.73,-4.71 0.26,-36.12c0,-0.79 -0.26,-1.31 -0.79,-1.83 -0.52,-0.52 -1.05,-0.52 -1.83,-0.52l-15.44,2.36c-1.05,0.26 -1.83,1.31 -1.83,2.36l-0.26,24.87 -7.85,-3.4v-67.79l38.48,-17.02zM128.44,240.45c-0.65,-0.01 -1.34,0.23 -1.73,0.63 -0.79,0.52 -1.05,1.31 -1.05,2.09v19.37c0,1.31 0.78,2.36 2.09,2.62l14.4,3.14h0.52c0.52,0 1.05,-0.26 1.83,-0.52 0.79,-0.52 1.05,-1.31 1.05,-2.09v-18.85c0,-1.31 -1.05,-2.36 -2.09,-2.62l-14.4,-3.66c-0.2,-0.07 -0.41,-0.1 -0.63,-0.1zM384.61,240.45c-0.2,0 -0.39,0.04 -0.59,0.1l-14.4,3.66c-1.31,0.26 -2.09,1.31 -2.09,2.62v18.85c0,0.79 0.52,1.57 1.05,2.09 0.52,0.26 1.05,0.52 1.57,0.52h0.79l14.4,-3.14c1.31,-0.26 2.09,-1.31 2.09,-2.62v-19.37c0,-0.79 -0.52,-1.57 -1.05,-2.09 -0.59,-0.39 -1.18,-0.64 -1.77,-0.63zM330.45,243c-0.28,0.01 -0.57,0.07 -0.87,0.17l-17.28,6.28c-1.05,0.26 -1.57,1.05 -1.57,2.1v11.52c0,0.79 0.52,1.31 1.05,1.83 0.26,0.26 0.79,0.52 1.31,0.52 0.26,0 0.53,0 0.79,-0.26l17.27,-5.76c1.05,-0.26 1.57,-1.05 1.57,-2.09v-12.04c0,-0.79 -0.52,-1.31 -1.05,-1.83 -0.33,-0.33 -0.76,-0.45 -1.22,-0.43zM182.65,243.26c-0.47,-0.02 -0.9,0.1 -1.22,0.43 -0.79,0.26 -1.05,1.05 -1.05,1.83v12.04c0,0.79 0.52,1.83 1.57,2.09l17.02,5.76h0.79c0.52,0 1.05,-0.26 1.31,-0.26 0.79,-0.52 1.05,-1.05 1.05,-1.83v-11.52c0,-0.79 -0.79,-1.83 -1.57,-2.09l-17.02,-6.28c-0.29,-0.1 -0.59,-0.16 -0.87,-0.17zM152.3,245.95c-0.59,-0.01 -1.18,0.23 -1.77,0.63 -0.79,0.52 -1.05,1.31 -1.05,2.09v19.11c0,1.31 0.78,2.36 2.09,2.62l14.4,3.4h0.52c0.52,0 1.05,-0.26 1.83,-0.52 0.79,-0.52 1.05,-1.31 1.05,-2.09v-18.85c0,-1.31 -1.05,-2.36 -2.09,-2.62l-14.4,-3.67c-0.2,-0.07 -0.39,-0.1 -0.59,-0.1zM361.05,245.95c-0.2,0 -0.39,0.04 -0.59,0.1l-14.4,3.67c-1.31,0.26 -2.09,1.31 -2.09,2.62v18.85c0,0.79 0.52,1.57 1.05,2.09 0.52,0.26 1.05,0.52 1.57,0.52h0.79l14.4,-3.4c1.31,-0.26 2.09,-1.31 2.09,-2.62v-19.11c0,-0.79 -0.52,-1.57 -1.05,-2.09 -0.59,-0.39 -1.18,-0.64 -1.77,-0.63zM130.9,246.57 L140.06,248.93v13.61l-9.16,-2.1v-13.87zM381.93,246.57v13.87l-9.16,2.1v-13.61l9.16,-2.36zM185.09,248.41 L197.65,253.12v6.8l-12.56,-4.19v-7.33zM328.27,248.67v7.07l-12.83,4.19v-6.8l12.83,-4.45zM154.72,251.81 L163.88,254.17v13.61l-9.16,-2.09v-13.87zM358.37,252.33v13.61l-9.16,2.09v-13.61l9.16,-2.09zM292.14,264.37v2.36l-8.9,2.88 8.9,-5.23zM220.68,265.16 L225.4,268.04 220.68,266.47v-1.31zM194.16,270.49c-0.47,-0.02 -0.9,0.1 -1.22,0.43 -0.52,0.52 -0.79,1.05 -0.79,1.83v12.3c0,1.05 0.79,1.83 1.83,2.09l16.49,3.93h0.52c0.52,0 1.05,-0.26 1.31,-0.26 0.52,-0.52 0.79,-1.05 0.79,-1.83v-11.78c0,-1.05 -0.52,-1.83 -1.57,-2.09l-16.49,-4.45c-0.29,-0.1 -0.59,-0.16 -0.87,-0.17zM318.6,270.55c-0.17,0.01 -0.35,0.04 -0.55,0.11l-16.49,4.45c-0.79,0.26 -1.57,1.05 -1.57,2.09v11.78c0,0.79 0.26,1.31 0.79,1.83 0.26,0.26 1.57,0.52 1.83,0.26l16.49,-3.93c1.05,0 1.83,-1.05 1.83,-2.09v-12.3c0,-0.79 -0.26,-1.31 -0.79,-1.83 -0.59,-0.2 -1.03,-0.39 -1.55,-0.37zM292.14,271.96v44.24l-5.24,-2.36v-15.44c0,-0.52 -0.26,-1.05 -0.52,-1.31 -0.26,-0.26 -0.79,-0.52 -1.31,-0.52l-8.11,0.52c-1.05,0 -1.83,0.78 -1.83,1.83v9.69l-3.14,-1.31v-28.79l20.16,-6.54zM220.68,272.23 L240.84,279.03v28.53l-3.4,1.31v-9.95c0,-1.05 -0.79,-1.83 -1.83,-1.83l-8.11,-0.52c-0.52,0 -1.05,0.26 -1.31,0.52 -0.26,0.26 -0.52,0.79 -0.52,1.31v15.97l-4.97,2.09v-44.24zM196.86,275.63 L208.9,278.77v7.07l-12.04,-2.88v-7.33zM316.48,275.63v7.59l-12.04,2.88v-7.07l12.04,-3.4zM231.67,280.08c-3.4,0 -6.02,3.14 -6.02,6.8s2.62,6.81 6.02,6.81c3.4,0 6.02,-3.14 6.02,-6.81s-2.62,-6.8 -6.02,-6.8zM281.4,280.08c-3.4,0 -6.02,3.14 -6.02,6.8s2.62,6.81 6.02,6.81c3.4,0 6.02,-3.14 6.02,-6.81s-2.62,-6.8 -6.02,-6.8zM231.67,283.74c1.31,0 2.36,1.31 2.36,3.14s-1.05,3.14 -2.36,3.14 -2.36,-1.31 -2.36,-3.14c0,-1.83 1.05,-3.14 2.36,-3.14zM281.4,283.74c1.31,0 2.36,1.31 2.36,3.14s-1.05,3.14 -2.36,3.14 -2.36,-1.31 -2.36,-3.14c0,-1.83 1.05,-3.14 2.36,-3.14zM374.59,287.93v64.92l-20.15,-8.64v-52.88l20.15,-3.4zM137.18,288.46 L157.33,292.12v52.35l-20.15,8.9v-64.92zM320.93,297.09 L320.67,328.77 309.67,323.79 309.94,298.66 320.93,297.09zM191.1,297.88 L202.09,299.45 202.36,324.32 191.36,329.03 191.1,297.88zM283.5,300.23v12.04l-4.45,-2.09v-9.69l4.45,-0.26zM229.32,300.5 L233.76,301.02v9.68l-4.45,2.09v-12.3z"
+        android:strokeWidth="2.6176"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="m91.35,103.39c-8.11,0 -14.66,6.54 -14.66,14.66v66.75c0,8.11 6.54,14.66 14.66,14.66s14.66,-6.54 14.66,-14.66v-52.09h62.3c8.11,0 14.66,-6.54 14.66,-14.66 0,-8.11 -6.54,-14.66 -14.66,-14.66zM343.69,103.39c-8.11,0 -14.66,6.54 -14.66,14.66 0,8.11 6.54,14.66 14.66,14.66h62.3v52.09c0,8.11 6.54,14.66 14.66,14.66 8.11,0 14.66,-6.54 14.66,-14.66v-66.75c0,-8.11 -6.54,-14.66 -14.66,-14.66zM91.35,312.27c-8.11,0 -14.66,6.54 -14.66,14.66v66.75c0,8.11 6.54,14.66 14.66,14.66h76.96c8.11,0 14.66,-6.54 14.66,-14.66 0,-8.11 -6.54,-14.66 -14.66,-14.66h-62.3v-52.09c0,-8.11 -6.54,-14.66 -14.66,-14.66zM420.64,312.27c-8.11,0 -14.66,6.54 -14.66,14.66v52.09h-62.3c-8.11,0 -14.66,6.54 -14.66,14.66 0,8.11 6.54,14.66 14.66,14.66h76.96c8.11,0 14.66,-6.54 14.66,-14.66v-66.75c0,-8.11 -6.54,-14.66 -14.66,-14.66z"
+        android:strokeWidth="2.6176"
+        android:fillColor="#FFFFFF"/>
+  </group>
+</vector>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>