feat(splash): use SplashScreen API with custom background

app/src/main/AndroidManifest.xml

@@ -10,19 +10,15 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.YaYa">
         <activity
-            android:name=".SplashActivity"
+            android:name=".MainActivity"
             android:exported="true"
-            android:theme="@style/Theme.YaYa.Splash">
+            android:theme="@style/Theme.YaYa.Starting">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
 
-        <activity
-            android:name=".MainActivity"
-            android:exported="true" />
-
         <activity
             android:name=".AboutActivity"
             android:exported="false" />

app/src/main/kotlin/plus/rua/project/SplashActivity.kt

@@ -1,45 +0,0 @@
-package plus.rua.project
-
-import android.content.Intent
-import android.os.Bundle
-import androidx.activity.compose.setContent
-import androidx.compose.ui.res.painterResource
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.launch
-import plus.rua.project.shared.R as CoreR
-import plus.rua.project.ui.SplashScreen
-import plus.rua.project.ui.theme.YaYaTheme
-
-private const val SPLASH_DELAY_MS = 400L
-
-/**
- * 启动页 Activity。
- *
- * 显示品牌启动图 400ms 后跳转到 [MainActivity]，并 finish 自身。
- */
-class SplashActivity : BaseActivity() {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-
-        setContent {
-            YaYaTheme {
-                SplashScreen(
-                    backgroundPainter = painterResource(CoreR.drawable.launch_bg),
-                    iconPainter = painterResource(R.mipmap.ic_launcher),
-                )
-            }
-        }
-
-        lifecycleScope.launch {
-            delay(SPLASH_DELAY_MS)
-            navigateToMain()
-        }
-    }
-
-    private fun navigateToMain() {
-        if (isFinishing) return
-        startActivityWithSlide(Intent(this, MainActivity::class.java))
-        finish()
-    }
-}

app/src/main/res/values-night/themes.xml

@@ -3,11 +3,7 @@
     <style name="Theme.YaYa" parent="@android:style/Theme.Material.NoActionBar" />
 
     <style name="Theme.YaYa.Starting" parent="Theme.SplashScreen">
-        <item name="windowSplashScreenBackground">@color/splash_background</item>
+        <item name="windowSplashScreenBackground">@drawable/launch_bg</item>
         <item name="postSplashScreenTheme">@style/Theme.YaYa</item>
     </style>
-
-    <style name="Theme.YaYa.Splash" parent="@android:style/Theme.Material.NoActionBar">
-        <item name="android:windowBackground">@color/splash_background</item>
-    </style>
 </resources>

app/src/main/res/values/themes.xml

@@ -5,15 +5,10 @@
     <!--
         启动主题：用于 MAIN/LAUNCHER Activity。
         继承 Theme.SplashScreen，保证 Android 12 以下也能获得一致的启动窗口行为。
-        windowSplashScreenBackground 使用 Material 3 静态基准色，作为动态颜色不可用时
+        windowSplashScreenBackground 使用启动背景图作为窗口背景。
-        的 fallback，以减少启动窗口与 Compose 首帧之间的色差闪烁。
     -->
     <style name="Theme.YaYa.Starting" parent="Theme.SplashScreen">
-        <item name="windowSplashScreenBackground">@color/splash_background</item>
+        <item name="windowSplashScreenBackground">@drawable/launch_bg</item>
         <item name="postSplashScreenTheme">@style/Theme.YaYa</item>
     </style>
-
-    <style name="Theme.YaYa.Splash" parent="@android:style/Theme.Material.Light.NoActionBar">
-        <item name="android:windowBackground">@color/splash_background</item>
-    </style>
 </resources>

core/src/main/kotlin/plus/rua/project/ui/SplashScreen.kt

@@ -1,77 +0,0 @@
-package plus.rua.project.ui
-
-import androidx.compose.foundation.Image
-import androidx.compose.foundation.background
-import androidx.compose.foundation.isSystemInDarkTheme
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.WindowInsets
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.statusBars
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.painter.Painter
-import androidx.compose.ui.layout.ContentScale
-import androidx.compose.ui.platform.LocalConfiguration
-import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.unit.dp
-
-private const val DarkOverlayAlpha = 0.4f
-private val SplashIconSize = 80.dp
-
-/**
- * 品牌启动页 UI。
- *
- * 背景图铺满全屏，暗色模式下叠加半透明黑色蒙层降低亮度。
- * app icon 水平居中，其垂直中心位于状态栏下方可用区域高度的约 25% 处。
- * 图片仅用于装饰，因此 contentDescription 为 null。
- *
- * @param backgroundPainter 启动背景图的 Painter
- * @param iconPainter app icon 的 Painter
- * @param modifier 外部传入的 Modifier
- */
-@Composable
-fun SplashScreen(
-    backgroundPainter: Painter,
-    iconPainter: Painter,
-    modifier: Modifier = Modifier,
-) {
-    val configuration = LocalConfiguration.current
-    val density = LocalDensity.current
-    val screenHeightDp = configuration.screenHeightDp.dp
-    val statusBarHeight = with(density) { WindowInsets.statusBars.getTop(this).toDp() }
-    val availableHeight = screenHeightDp - statusBarHeight
-    val iconTopPadding = statusBarHeight + (availableHeight * 0.25f) - (SplashIconSize / 2)
-    val isDark = isSystemInDarkTheme()
-
-    Box(
-        modifier = modifier.fillMaxSize(),
-    ) {
-        Image(
-            painter = backgroundPainter,
-            contentDescription = null,
-            contentScale = ContentScale.Crop,
-            modifier = Modifier.fillMaxSize(),
-        )
-
-        if (isDark) {
-            Box(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .background(Color.Black.copy(alpha = DarkOverlayAlpha)),
-            )
-        }
-
-        Image(
-            painter = iconPainter,
-            contentDescription = null,
-            modifier = Modifier
-                .align(Alignment.TopCenter)
-                .padding(top = iconTopPadding.coerceAtLeast(statusBarHeight))
-                .size(SplashIconSize),
-        )
-    }
-}