Support Android 5.0 and change launcher icon.

The size will increase too much if support Android 4.0

app/build.gradle.kts

@@ -10,7 +10,7 @@ android {
 
   defaultConfig {
     applicationId = "org.matrix.chromext"
-    minSdk = 26
+    minSdk = 21
     targetSdk = 33
     versionCode = 6
     versionName = "3.0.0"
@@ -34,7 +34,12 @@ android {
   }
 
   lintOptions {
-    disable("Internationalization", "UnsafeIntentLaunch", "UnspecifiedRegisterReceiverFlag")
+    disable(
+        "Internationalization",
+        "UnsafeIntentLaunch",
+        "UnspecifiedRegisterReceiverFlag",
+        "VectorPath",
+        "Usability:Icons")
   }
 
   kotlinOptions { jvmTarget = JavaVersion.VERSION_18.toString() }

app/src/main/res/drawable/ic_chrome.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+		android:fillColor="@android:color/black"
+        android:pathData="M12 20l3.46-6h-0.01c0.34-0.6 0.55 -1.27 0.55 -2c0-1.2-0.54-2.27-1.38-3h4.79c0.38 0.93 0.59 1.94 0.59 3a8 8 0 0 1-8 8m-8-8c0-1.46 0.39 -2.82 1.07-4l3.47 6h0.01c0.69 1.19 1.95 2 3.45 2c0.45 0 0.88-0.09 1.29-0.23l-2.4 4.14C7 19.37 4 16.04 4 12m11 0a3 3 0 0 1-3 3a3 3 0 0 1-3-3a3 3 0 0 1 3-3a3 3 0 0 1 3 3m-3-8a7.98 7.98 0 0 1 6.92 4H12c-1.94 0-3.55 1.38-3.92 3.21L5.7 7.08A7.981 7.981 0 0 1 12 4m0-2A10 10 0 0 0 2 12a10 10 0 0 0 10 10a10 10 0 0 0 10-10A10 10 0 0 0 12 2Z" />
+</vector>

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

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android" >
+	<background android:drawable="@android:color/white"/>
+	<foreground >
+		<inset
+			android:drawable="@drawable/ic_chrome"
+			android:insetTop="7.2dp"
+			android:insetBottom="7.2dp"
+			android:insetLeft="7.2dp"
+			android:insetRight="7.2dp"
+			/>
+	</foreground >
+</adaptive-icon>

app/src/main/res/mipmap/ic_launcher.xml

@@ -1,12 +1,3 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--
-Copyright 2022 The Chromium Authors
-Use of this source code is governed by a BSD-style license that can be
-found in the LICENSE file.
--->
-
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android" >
-	<background android:drawable="@android:color/transparent"/>
-	<foreground android:drawable="@mipmap/layered_app_icon"/>
-	<monochrome android:drawable="@drawable/themed_app_icon"/>
-</adaptive-icon>
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+	android:drawable="@drawable/ic_chrome" />