Optimize Android TV launcher icon

2026-08-05 14:54:07 +08:00
parent 4551e57ff4
commit 9a99897864
8 changed files with 128 additions and 0 deletions
@@ -0,0 +1,102 @@
+import 'dart:io';
+import 'dart:ui' as ui;
+
+import 'package:flutter_test/flutter_test.dart';
+
+String _androidAttribute(String source, String element, String attribute) {
+  final elementTag = RegExp('<$element\\b[^>]*>').firstMatch(source)!.group(0)!;
+  return RegExp(
+    'android:$attribute="([^"]+)"',
+  ).firstMatch(elementTag)!.group(1)!;
+}
+
+double _androidDoubleAttribute(
+  String source,
+  String element,
+  String attribute,
+) {
+  return double.parse(_androidAttribute(source, element, attribute));
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test('TV launcher icons meet density-specific minimum sizes', () async {
+    const expectedSizes = {
+      'mdpi': 80,
+      'hdpi': 120,
+      'xhdpi': 160,
+      'xxhdpi': 240,
+      'xxxhdpi': 320,
+    };
+
+    for (final MapEntry(key: density, value: size) in expectedSizes.entries) {
+      final file = File(
+        'android/app/src/main/res/'
+        'mipmap-television-$density/ic_launcher.webp',
+      );
+      expect(file.existsSync(), isTrue, reason: 'missing ${file.path}');
+
+      final codec = await ui.instantiateImageCodec(await file.readAsBytes());
+      final frame = await codec.getNextFrame();
+      expect(
+        (frame.image.width, frame.image.height),
+        (size, size),
+        reason: file.path,
+      );
+      frame.image.dispose();
+      codec.dispose();
+    }
+  });
+
+  test('TV adaptive launcher icon stays centered in the safe zone', () {
+    final adaptiveIcon = File(
+      'android/app/src/main/res/'
+      'mipmap-television-anydpi-v26/ic_launcher.xml',
+    ).readAsStringSync();
+    expect(
+      _androidAttribute(adaptiveIcon, 'foreground', 'drawable'),
+      '@drawable/ic_launcher_foreground_tv',
+    );
+    expect(
+      _androidAttribute(adaptiveIcon, 'background', 'drawable'),
+      '@color/ic_launcher_background',
+    );
+
+    final vector = File(
+      'android/app/src/main/res/drawable/'
+      'ic_launcher_foreground_tv.xml',
+    ).readAsStringSync();
+    final scaleX = _androidDoubleAttribute(vector, 'group', 'scaleX');
+    final scaleY = _androidDoubleAttribute(vector, 'group', 'scaleY');
+    final translateX = _androidDoubleAttribute(vector, 'group', 'translateX');
+    final translateY = _androidDoubleAttribute(vector, 'group', 'translateY');
+    final viewportWidth = _androidDoubleAttribute(
+      vector,
+      'vector',
+      'viewportWidth',
+    );
+    final viewportHeight = _androidDoubleAttribute(
+      vector,
+      'vector',
+      'viewportHeight',
+    );
+
+    // Conservative bounds of the current logo, including the curved caps.
+    const logoBounds = ui.Rect.fromLTRB(54, 33, 179, 206.5);
+    final transformedBounds = ui.Rect.fromLTRB(
+      (logoBounds.left * scaleX + translateX) / viewportWidth * 108,
+      (logoBounds.top * scaleY + translateY) / viewportHeight * 108,
+      (logoBounds.right * scaleX + translateX) / viewportWidth * 108,
+      (logoBounds.bottom * scaleY + translateY) / viewportHeight * 108,
+    );
+    const safeZone = ui.Rect.fromLTWH(18, 18, 72, 72);
+
+    expect(transformedBounds.left, greaterThanOrEqualTo(safeZone.left));
+    expect(transformedBounds.top, greaterThanOrEqualTo(safeZone.top));
+    expect(transformedBounds.right, lessThanOrEqualTo(safeZone.right));
+    expect(transformedBounds.bottom, lessThanOrEqualTo(safeZone.bottom));
+    expect(transformedBounds.center.dx, closeTo(safeZone.center.dx, 0.05));
+    expect(transformedBounds.center.dy, closeTo(safeZone.center.dy, 0.05));
+  });
+}