refactor(app): 重构应用架构并优化设置管理

- 将 MainActivity 中的 UI 组件提取到独立的 PosefitApp Composable 函数中
- 创建 StreamSettings 和 StreamSettingsStore 类以统一管理流媒体设置
- 移除 MainActivity 中大量的内联 Composable 函数和状态管理代码
- 更新 PosefitStreamingService 以使用新的设置存储机制
- 简化服务启动逻辑并将 StreamSettings 对象作为参数传递
- 迁移所有设置相关的 SharedPreferences 操作到专门的设置存储类中

app/src/main/kotlin/com/kimgo/posefit/MainActivity.kt

@@ -1,65 +1,32 @@
 package com.kimgo.posefit
 
 import android.Manifest
-import android.content.Context
 import android.os.Build
 import android.os.Bundle
 import android.view.WindowManager
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.result.contract.ActivityResultContracts
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.ColumnScope
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Button
-import androidx.compose.material3.DropdownMenu
-import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Surface
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
-import androidx.compose.material3.TextField
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.unit.dp
-import com.kimgo.posefit.PosefitStreamingService.Companion.KEY_CAMERA_FACING
-import com.kimgo.posefit.PosefitStreamingService.Companion.KEY_CAMERA_NAME
-import com.kimgo.posefit.PosefitStreamingService.Companion.KEY_SIGNALING_URL
-import com.kimgo.posefit.PosefitStreamingService.Companion.KEY_STREAM_ORIENTATION
-import com.kimgo.posefit.PosefitStreamingService.Companion.KEY_VIDEO_HEIGHT
-import com.kimgo.posefit.PosefitStreamingService.Companion.KEY_VIDEO_WIDTH
-import com.kimgo.posefit.PosefitStreamingService.Companion.PREFS_NAME
-import com.kimgo.posefit.sender.CameraCatalog
-import com.kimgo.posefit.sender.CameraFacing
 import com.kimgo.posefit.sender.StreamOrientation
-import com.kimgo.posefit.sender.StreamResolution
+import com.kimgo.posefit.settings.StreamSettings
+import com.kimgo.posefit.settings.StreamSettingsStore
+import com.kimgo.posefit.ui.PosefitApp
 import timber.log.Timber
 
 class MainActivity : ComponentActivity() {
 
+    private lateinit var settingsStore: StreamSettingsStore
     private var permissionResultHandler: ((Boolean) -> Unit)? = null
 
     private val requestPermission =
         registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { grants ->
             val cameraGranted = grants[Manifest.permission.CAMERA] == true
             if (cameraGranted) {
-                startWebRtc(getSavedSettings())
+                startWebRtc(settingsStore.get())
             } else {
                 Timber.w("Camera permission denied")
             }
@@ -70,7 +37,9 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         Timber.d("MainActivity onCreate")
-        applyStreamOrientation(getSavedOrientation())
+
+        settingsStore = StreamSettingsStore(this)
+        applyStreamOrientation(settingsStore.get().orientation)
         window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
 
         setContent {
@@ -79,395 +48,27 @@ class MainActivity : ComponentActivity() {
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colorScheme.background,
                 ) {
-                    PosefitApp()
-                }
-            }
-        }
-    }
-
-    @Composable
-    private fun PosefitApp() {
-        var screen by remember { mutableStateOf(AppScreen.HOME) }
-        var isStreaming by remember { mutableStateOf(PosefitStreamingService.isRunning) }
-        var settings by remember { mutableStateOf(getSavedSettings()) }
-
-        when (screen) {
-            AppScreen.HOME -> HomeScreen(
-                isStreaming = isStreaming,
-                settings = settings,
-                onToggleStreaming = {
-                    if (isStreaming) {
-                        stopWebRtc()
-                        isStreaming = false
-                    } else {
-                        saveSettings(settings)
-                        applyStreamOrientation(settings.orientation)
-                        permissionResultHandler = { granted ->
-                            isStreaming = granted
-                        }
+                    PosefitApp(
+                        context = this,
+                        initialSettings = settingsStore.get(),
+                        isInitiallyStreaming = PosefitStreamingService.isRunning,
+                        onStartStreaming = { _, onPermissionResult ->
+                            permissionResultHandler = onPermissionResult
                             requestPermission.launch(requiredPermissions())
-                    }
-                },
-                onOpenSettings = { screen = AppScreen.SETTINGS },
-                onRotate = {
-                    val updated = settings.copy(orientation = settings.orientation.next())
-                    settings = updated
-                    saveSettings(updated)
-                    applyStreamOrientation(updated.orientation)
-                },
-            )
-
-            AppScreen.SETTINGS -> SettingsScreen(
-                initialSettings = settings,
-                isStreaming = isStreaming,
-                onSave = { updated ->
-                    settings = updated
-                    saveSettings(updated)
-                    screen = AppScreen.HOME
-                },
-                onBack = { screen = AppScreen.HOME },
-            )
-        }
-    }
-
-    @Composable
-    private fun HomeScreen(
-        isStreaming: Boolean,
-        settings: StreamSettings,
-        onToggleStreaming: () -> Unit,
-        onOpenSettings: () -> Unit,
-        onRotate: () -> Unit,
-    ) {
-        Box(
-            modifier = Modifier
-                .fillMaxSize()
-                .padding(24.dp),
-        ) {
-            Row(
-                modifier = Modifier.align(Alignment.TopEnd),
-                horizontalArrangement = Arrangement.spacedBy(8.dp),
-            ) {
-                TextButton(onClick = onRotate) {
-                    Text("旋转")
-                }
-                TextButton(
-                    onClick = onOpenSettings,
-                    enabled = !isStreaming,
-                ) {
-                    Text("设置")
-                }
-            }
-
-            Column(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .padding(horizontal = 24.dp),
-                verticalArrangement = Arrangement.Center,
-                horizontalAlignment = Alignment.CenterHorizontally,
-            ) {
-                Text(
-                    text = "PoseFit",
-                    style = MaterialTheme.typography.headlineLarge,
-                    fontWeight = FontWeight.Bold,
-                    color = MaterialTheme.colorScheme.primary,
-                )
-                Spacer(modifier = Modifier.height(12.dp))
-                Text(
-                    text = if (isStreaming) {
-                        "正在推流：${settings.resolution.label} ${settings.orientation.label}"
-                    } else {
-                        "未推流：${settings.resolution.label} ${settings.orientation.label}"
-                    },
-                    style = MaterialTheme.typography.titleMedium,
-                    color = if (isStreaming) {
-                        MaterialTheme.colorScheme.primary
-                    } else {
-                        MaterialTheme.colorScheme.onSurfaceVariant
-                    },
-                )
-                Spacer(modifier = Modifier.height(24.dp))
-                Button(
-                    onClick = onToggleStreaming,
-                    modifier = Modifier
-                        .fillMaxWidth(0.72f)
-                        .height(56.dp),
-                ) {
-                    Text(if (isStreaming) "停止推流" else "开始推流")
-                }
-            }
-        }
-    }
-
-    @Composable
-    private fun SettingsScreen(
-        initialSettings: StreamSettings,
-        isStreaming: Boolean,
-        onSave: (StreamSettings) -> Unit,
-        onBack: () -> Unit,
-    ) {
-        var url by remember { mutableStateOf(initialSettings.signalingUrl) }
-        var cameraFacing by remember { mutableStateOf(initialSettings.cameraFacing) }
-        var selectedCameraName by remember { mutableStateOf(initialSettings.cameraName) }
-        var selectedResolution by remember { mutableStateOf(initialSettings.resolution) }
-        var cameraMenuExpanded by remember { mutableStateOf(false) }
-        var resolutionMenuExpanded by remember { mutableStateOf(false) }
-        val cameraOptions = remember { runCatching { CameraCatalog.listOptions(this) }.getOrDefault(emptyList()) }
-        val selectedCameraOption = remember(selectedCameraName, cameraOptions) {
-            resolveSelectedCameraOption(cameraOptions, selectedCameraName)
-        }
-        val availableResolutions = remember(selectedCameraOption) {
-            selectedCameraOption?.supportedResolutions
-                ?.takeIf { it.isNotEmpty() }
-                ?: StreamResolution.PRESETS
-        }
-        val effectiveResolution = remember(availableResolutions, selectedResolution) {
-            chooseResolution(availableResolutions, selectedResolution)
-        }
-        val selectedCameraLabel = remember(selectedCameraName, selectedCameraOption) {
-            if (selectedCameraName.isNullOrBlank()) {
-                "自动选择后置最广角"
-            } else {
-                selectedCameraOption?.label ?: "自动选择后置最广角"
-            }
-        }
-
-        Column(
-            modifier = Modifier
-                .fillMaxSize()
-                .verticalScroll(rememberScrollState())
-                .padding(horizontal = 28.dp, vertical = 20.dp),
-            verticalArrangement = Arrangement.spacedBy(16.dp),
-        ) {
-            Row(
-                modifier = Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.SpaceBetween,
-                verticalAlignment = Alignment.CenterVertically,
-            ) {
-                Text(
-                    text = "设置",
-                    style = MaterialTheme.typography.headlineSmall,
-                    fontWeight = FontWeight.Bold,
-                )
-                TextButton(onClick = onBack) {
-                    Text("返回")
-                }
-            }
-
-            TextField(
-                value = url,
-                onValueChange = { url = it },
-                label = { Text("WS 服务器地址") },
-                modifier = Modifier.fillMaxWidth(),
-                singleLine = true,
-                enabled = !isStreaming,
-            )
-
-            SettingGroup(title = "摄像头") {
-                Box(modifier = Modifier.fillMaxWidth()) {
-                    OutlinedButton(
-                        onClick = { cameraMenuExpanded = true },
-                        enabled = !isStreaming,
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .height(48.dp),
-                    ) {
-                        Text(selectedCameraLabel, maxLines = 1)
-                    }
-                    DropdownMenu(
-                        expanded = cameraMenuExpanded,
-                        onDismissRequest = { cameraMenuExpanded = false },
-                    ) {
-                        DropdownMenuItem(
-                            text = { Text("自动选择后置最广角") },
-                            onClick = {
-                                cameraFacing = CameraFacing.BACK
-                                selectedCameraName = null
-                                selectedResolution = chooseResolution(
-                                    resolveSelectedCameraOption(cameraOptions, null)
-                                        ?.supportedResolutions
-                                        ?.takeIf { it.isNotEmpty() }
-                                        ?: StreamResolution.PRESETS,
-                                    selectedResolution,
-                                )
-                                cameraMenuExpanded = false
-                            },
-                        )
-                        cameraOptions.forEach { option ->
-                            DropdownMenuItem(
-                                text = { Text(option.label) },
-                                onClick = {
-                                    cameraFacing = option.facing
-                                    selectedCameraName = option.name
-                                    selectedResolution = chooseResolution(
-                                        option.supportedResolutions.takeIf { it.isNotEmpty() }
-                                            ?: StreamResolution.PRESETS,
-                                        selectedResolution,
-                                    )
-                                    cameraMenuExpanded = false
                         },
+                        onStopStreaming = ::stopWebRtc,
+                        onSaveSettings = settingsStore::save,
+                        onApplyOrientation = { applyStreamOrientation(it.orientation) },
                     )
                 }
             }
         }
     }
 
-            SettingGroup(title = "推流分辨率") {
-                Box(modifier = Modifier.fillMaxWidth()) {
-                    OutlinedButton(
-                        onClick = { resolutionMenuExpanded = true },
-                        enabled = !isStreaming,
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .height(48.dp),
-                    ) {
-                        Text(effectiveResolution.label, maxLines = 1)
-                    }
-                    DropdownMenu(
-                        expanded = resolutionMenuExpanded,
-                        onDismissRequest = { resolutionMenuExpanded = false },
-                    ) {
-                        availableResolutions.forEach { resolution ->
-                            DropdownMenuItem(
-                                text = { Text(resolution.label) },
-                                onClick = {
-                                    selectedResolution = resolution
-                                    resolutionMenuExpanded = false
-                                },
-                            )
-                        }
-                    }
-                }
-            }
-
-            Button(
-                onClick = {
-                    onSave(
-                        StreamSettings(
-                            signalingUrl = url.trim(),
-                            cameraFacing = cameraFacing,
-                            cameraName = selectedCameraName,
-                            resolution = effectiveResolution,
-                            orientation = initialSettings.orientation,
-                        )
-                    )
-                },
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .height(52.dp),
-            ) {
-                Text("保存设置")
-            }
-        }
-    }
-
-    @Composable
-    private fun SettingGroup(
-        title: String,
-        content: @Composable ColumnScope.() -> Unit,
-    ) {
-        Column(
-            modifier = Modifier.fillMaxWidth(),
-            verticalArrangement = Arrangement.spacedBy(8.dp),
-        ) {
-            Text(
-                text = title,
-                style = MaterialTheme.typography.titleSmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
-            )
-            content()
-        }
-    }
-
-    private fun getSavedSettings(): StreamSettings {
-        return StreamSettings(
-            signalingUrl = getSavedSignalingUrl(),
-            cameraFacing = getSavedCameraFacing(),
-            cameraName = getSavedCameraName(),
-            resolution = getSavedResolution(),
-            orientation = getSavedOrientation(),
-        )
-    }
-
-    private fun saveSettings(settings: StreamSettings) {
-        getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-            .edit()
-            .putString(KEY_SIGNALING_URL, settings.signalingUrl)
-            .putString(KEY_CAMERA_FACING, settings.cameraFacing.name)
-            .putString(KEY_CAMERA_NAME, settings.cameraName)
-            .putInt(KEY_VIDEO_WIDTH, settings.resolution.width)
-            .putInt(KEY_VIDEO_HEIGHT, settings.resolution.height)
-            .putString(KEY_STREAM_ORIENTATION, settings.orientation.name)
-            .apply()
-    }
-
-    private fun getSavedSignalingUrl(): String {
-        val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        return prefs.getString(KEY_SIGNALING_URL, DEFAULT_SIGNALING_URL) ?: DEFAULT_SIGNALING_URL
-    }
-
-    private fun getSavedCameraFacing(): CameraFacing {
-        val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        val value = prefs.getString(KEY_CAMERA_FACING, CameraFacing.BACK.name)
-        return runCatching { CameraFacing.valueOf(value ?: CameraFacing.BACK.name) }
-            .getOrDefault(CameraFacing.BACK)
-    }
-
-    private fun getSavedCameraName(): String? {
-        val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        return prefs.getString(KEY_CAMERA_NAME, null)?.takeIf { it.isNotBlank() }
-    }
-
-    private fun getSavedResolution(): StreamResolution {
-        val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        return StreamResolution.from(
-            prefs.getInt(KEY_VIDEO_WIDTH, StreamResolution.DEFAULT.width),
-            prefs.getInt(KEY_VIDEO_HEIGHT, StreamResolution.DEFAULT.height),
-        )
-    }
-
-    private fun getSavedOrientation(): StreamOrientation {
-        val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        val value = prefs.getString(KEY_STREAM_ORIENTATION, StreamOrientation.DEFAULT.name)
-        return runCatching { StreamOrientation.valueOf(value ?: StreamOrientation.DEFAULT.name) }
-            .getOrDefault(StreamOrientation.DEFAULT)
-    }
-
     private fun applyStreamOrientation(orientation: StreamOrientation) {
         requestedOrientation = orientation.activityOrientation
     }
 
-    private fun resolveSelectedCameraOption(
-        cameraOptions: List<com.kimgo.posefit.sender.CameraOption>,
-        selectedCameraName: String?,
-    ): com.kimgo.posefit.sender.CameraOption? {
-        if (!selectedCameraName.isNullOrBlank()) {
-            return cameraOptions.firstOrNull { it.name == selectedCameraName }
-        }
-
-        return cameraOptions
-            .filter { it.facing == CameraFacing.BACK }
-            .minByOrNull { it.minFocalLength ?: Float.MAX_VALUE }
-            ?: cameraOptions.firstOrNull()
-    }
-
-    private fun chooseResolution(
-        availableResolutions: List<StreamResolution>,
-        currentResolution: StreamResolution,
-    ): StreamResolution {
-        if (availableResolutions.isEmpty()) {
-            return StreamResolution.DEFAULT
-        }
-        if (currentResolution in availableResolutions) {
-            return currentResolution
-        }
-        if (StreamResolution.DEFAULT in availableResolutions) {
-            return StreamResolution.DEFAULT
-        }
-        return availableResolutions.minByOrNull {
-            kotlin.math.abs((it.width * it.height) - (StreamResolution.DEFAULT.width * StreamResolution.DEFAULT.height))
-        } ?: availableResolutions.first()
-    }
-
     private fun startWebRtc(settings: StreamSettings) {
         Timber.i(
             "startWebRtc: %s, cameraFacing=%s, cameraName=%s, resolution=%s, orientation=%s",
@@ -480,11 +81,7 @@ class MainActivity : ComponentActivity() {
         applyStreamOrientation(settings.orientation)
         val intent = PosefitStreamingService.startIntent(
             context = this,
-            signalingUrl = settings.signalingUrl,
-            cameraFacing = settings.cameraFacing,
-            preferredCameraName = settings.cameraName,
-            resolution = settings.resolution,
-            orientation = settings.orientation,
+            settings = settings,
         )
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             startForegroundService(intent)
@@ -511,21 +108,4 @@ class MainActivity : ComponentActivity() {
         super.onDestroy()
         Timber.d("MainActivity onDestroy")
     }
-
-    private enum class AppScreen {
-        HOME,
-        SETTINGS,
-    }
-
-    private data class StreamSettings(
-        val signalingUrl: String,
-        val cameraFacing: CameraFacing,
-        val cameraName: String?,
-        val resolution: StreamResolution,
-        val orientation: StreamOrientation,
-    )
-
-    private companion object {
-        private const val DEFAULT_SIGNALING_URL = "ws://192.168.2.6:8765"
-    }
 }

app/src/main/kotlin/com/kimgo/posefit/PosefitStreamingService.kt

@@ -13,6 +13,8 @@ import com.kimgo.posefit.sender.CameraFacing
 import com.kimgo.posefit.sender.StreamOrientation
 import com.kimgo.posefit.sender.StreamResolution
 import com.kimgo.posefit.sender.WebRtcSenderClient
+import com.kimgo.posefit.settings.StreamSettings
+import com.kimgo.posefit.settings.StreamSettingsStore
 import timber.log.Timber
 
 class PosefitStreamingService : Service() {
@@ -34,11 +36,12 @@ class PosefitStreamingService : Service() {
 
             ACTION_START -> {
                 val settings = StreamSettings(
-                    signalingUrl = intent.getStringExtra(EXTRA_SIGNALING_URL) ?: DEFAULT_SIGNALING_URL,
+                    signalingUrl = intent.getStringExtra(EXTRA_SIGNALING_URL)
+                        ?: StreamSettingsStore.DEFAULT_SIGNALING_URL,
                     cameraFacing = intent.getStringExtra(EXTRA_CAMERA_FACING)
                         ?.let { runCatching { CameraFacing.valueOf(it) }.getOrNull() }
                         ?: CameraFacing.BACK,
-                    preferredCameraName = intent.getStringExtra(EXTRA_CAMERA_NAME),
+                    cameraName = intent.getStringExtra(EXTRA_CAMERA_NAME),
                     resolution = StreamResolution.from(
                         intent.getIntExtra(EXTRA_VIDEO_WIDTH, StreamResolution.DEFAULT.width),
                         intent.getIntExtra(EXTRA_VIDEO_HEIGHT, StreamResolution.DEFAULT.height),
@@ -53,7 +56,7 @@ class PosefitStreamingService : Service() {
             }
 
             else -> {
-                val settings = getSavedSettings()
+                val settings = StreamSettingsStore(this).get()
                 startForegroundNotification(settings)
                 startStreaming(settings)
                 return START_STICKY
@@ -73,7 +76,7 @@ class PosefitStreamingService : Service() {
             "Streaming service start: %s, cameraFacing=%s, preferredCameraName=%s, resolution=%s, orientation=%s",
             settings.signalingUrl,
             settings.cameraFacing,
-            settings.preferredCameraName,
+            settings.cameraName,
             settings.resolution.label,
             settings.orientation,
         )
@@ -82,7 +85,7 @@ class PosefitStreamingService : Service() {
             context = applicationContext,
             signalingUrl = settings.signalingUrl,
             cameraFacing = settings.cameraFacing,
-            preferredCameraName = settings.preferredCameraName,
+            preferredCameraName = settings.cameraName,
             videoWidth = settings.resolution.width,
             videoHeight = settings.resolution.height,
             streamOrientation = settings.orientation,
@@ -111,7 +114,7 @@ class PosefitStreamingService : Service() {
             CameraFacing.FRONT -> "前置摄像头"
             CameraFacing.BACK -> "后置摄像头"
         }
-        val cameraModeText = settings.preferredCameraName
+        val cameraModeText = settings.cameraName
             ?.let { "$cameraText $it" }
             ?: "$cameraText 自动最广角"
         val streamText = "${settings.resolution.label} ${settings.orientation.label}"
@@ -147,33 +150,6 @@ class PosefitStreamingService : Service() {
         manager.createNotificationChannel(channel)
     }
 
-    private fun getSavedSettings(): StreamSettings {
-        val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        val cameraFacingValue = prefs.getString(KEY_CAMERA_FACING, CameraFacing.BACK.name)
-        val orientationValue = prefs.getString(KEY_STREAM_ORIENTATION, StreamOrientation.DEFAULT.name)
-
-        return StreamSettings(
-            signalingUrl = prefs.getString(KEY_SIGNALING_URL, DEFAULT_SIGNALING_URL) ?: DEFAULT_SIGNALING_URL,
-            cameraFacing = runCatching { CameraFacing.valueOf(cameraFacingValue ?: CameraFacing.BACK.name) }
-                .getOrDefault(CameraFacing.BACK),
-            preferredCameraName = prefs.getString(KEY_CAMERA_NAME, null)?.takeIf { it.isNotBlank() },
-            resolution = StreamResolution.from(
-                prefs.getInt(KEY_VIDEO_WIDTH, StreamResolution.DEFAULT.width),
-                prefs.getInt(KEY_VIDEO_HEIGHT, StreamResolution.DEFAULT.height),
-            ),
-            orientation = runCatching { StreamOrientation.valueOf(orientationValue ?: StreamOrientation.DEFAULT.name) }
-                .getOrDefault(StreamOrientation.DEFAULT),
-        )
-    }
-
-    private data class StreamSettings(
-        val signalingUrl: String,
-        val cameraFacing: CameraFacing,
-        val preferredCameraName: String?,
-        val resolution: StreamResolution,
-        val orientation: StreamOrientation,
-    )
-
     companion object {
         private const val CHANNEL_ID = "posefit_streaming"
         private const val NOTIFICATION_ID = 1001
@@ -185,15 +161,6 @@ class PosefitStreamingService : Service() {
         private const val EXTRA_VIDEO_WIDTH = "extra_video_width"
         private const val EXTRA_VIDEO_HEIGHT = "extra_video_height"
         private const val EXTRA_STREAM_ORIENTATION = "extra_stream_orientation"
-        private const val DEFAULT_SIGNALING_URL = "ws://192.168.2.6:8765"
-
-        const val PREFS_NAME = "posefit_prefs"
-        const val KEY_SIGNALING_URL = "signaling_url"
-        const val KEY_CAMERA_FACING = "camera_facing"
-        const val KEY_CAMERA_NAME = "camera_name"
-        const val KEY_VIDEO_WIDTH = "video_width"
-        const val KEY_VIDEO_HEIGHT = "video_height"
-        const val KEY_STREAM_ORIENTATION = "stream_orientation"
 
         @Volatile
         var isRunning: Boolean = false
@@ -201,20 +168,16 @@ class PosefitStreamingService : Service() {
 
         fun startIntent(
             context: Context,
-            signalingUrl: String,
-            cameraFacing: CameraFacing,
-            preferredCameraName: String?,
-            resolution: StreamResolution,
-            orientation: StreamOrientation,
+            settings: StreamSettings,
         ): Intent {
             return Intent(context, PosefitStreamingService::class.java).apply {
                 action = ACTION_START
-                putExtra(EXTRA_SIGNALING_URL, signalingUrl)
-                putExtra(EXTRA_CAMERA_FACING, cameraFacing.name)
-                putExtra(EXTRA_CAMERA_NAME, preferredCameraName)
-                putExtra(EXTRA_VIDEO_WIDTH, resolution.width)
-                putExtra(EXTRA_VIDEO_HEIGHT, resolution.height)
-                putExtra(EXTRA_STREAM_ORIENTATION, orientation.name)
+                putExtra(EXTRA_SIGNALING_URL, settings.signalingUrl)
+                putExtra(EXTRA_CAMERA_FACING, settings.cameraFacing.name)
+                putExtra(EXTRA_CAMERA_NAME, settings.cameraName)
+                putExtra(EXTRA_VIDEO_WIDTH, settings.resolution.width)
+                putExtra(EXTRA_VIDEO_HEIGHT, settings.resolution.height)
+                putExtra(EXTRA_STREAM_ORIENTATION, settings.orientation.name)
             }
         }
 

app/src/main/kotlin/com/kimgo/posefit/settings/StreamSettings.kt

@@ -0,0 +1,13 @@
+package com.kimgo.posefit.settings
+
+import com.kimgo.posefit.sender.CameraFacing
+import com.kimgo.posefit.sender.StreamOrientation
+import com.kimgo.posefit.sender.StreamResolution
+
+data class StreamSettings(
+    val signalingUrl: String,
+    val cameraFacing: CameraFacing,
+    val cameraName: String?,
+    val resolution: StreamResolution,
+    val orientation: StreamOrientation,
+)

app/src/main/kotlin/com/kimgo/posefit/settings/StreamSettingsStore.kt

@@ -0,0 +1,51 @@
+package com.kimgo.posefit.settings
+
+import android.content.Context
+import com.kimgo.posefit.sender.CameraFacing
+import com.kimgo.posefit.sender.StreamOrientation
+import com.kimgo.posefit.sender.StreamResolution
+
+class StreamSettingsStore(private val context: Context) {
+
+    private val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    fun get(): StreamSettings {
+        val cameraFacingValue = prefs.getString(KEY_CAMERA_FACING, CameraFacing.BACK.name)
+        val orientationValue = prefs.getString(KEY_STREAM_ORIENTATION, StreamOrientation.DEFAULT.name)
+
+        return StreamSettings(
+            signalingUrl = prefs.getString(KEY_SIGNALING_URL, DEFAULT_SIGNALING_URL) ?: DEFAULT_SIGNALING_URL,
+            cameraFacing = runCatching { CameraFacing.valueOf(cameraFacingValue ?: CameraFacing.BACK.name) }
+                .getOrDefault(CameraFacing.BACK),
+            cameraName = prefs.getString(KEY_CAMERA_NAME, null)?.takeIf { it.isNotBlank() },
+            resolution = StreamResolution.from(
+                prefs.getInt(KEY_VIDEO_WIDTH, StreamResolution.DEFAULT.width),
+                prefs.getInt(KEY_VIDEO_HEIGHT, StreamResolution.DEFAULT.height),
+            ),
+            orientation = runCatching { StreamOrientation.valueOf(orientationValue ?: StreamOrientation.DEFAULT.name) }
+                .getOrDefault(StreamOrientation.DEFAULT),
+        )
+    }
+
+    fun save(settings: StreamSettings) {
+        prefs.edit()
+            .putString(KEY_SIGNALING_URL, settings.signalingUrl)
+            .putString(KEY_CAMERA_FACING, settings.cameraFacing.name)
+            .putString(KEY_CAMERA_NAME, settings.cameraName)
+            .putInt(KEY_VIDEO_WIDTH, settings.resolution.width)
+            .putInt(KEY_VIDEO_HEIGHT, settings.resolution.height)
+            .putString(KEY_STREAM_ORIENTATION, settings.orientation.name)
+            .apply()
+    }
+
+    companion object {
+        const val PREFS_NAME = "posefit_prefs"
+        const val KEY_SIGNALING_URL = "signaling_url"
+        const val KEY_CAMERA_FACING = "camera_facing"
+        const val KEY_CAMERA_NAME = "camera_name"
+        const val KEY_VIDEO_WIDTH = "video_width"
+        const val KEY_VIDEO_HEIGHT = "video_height"
+        const val KEY_STREAM_ORIENTATION = "stream_orientation"
+        const val DEFAULT_SIGNALING_URL = "ws://192.168.2.6:8765"
+    }
+}

app/src/main/kotlin/com/kimgo/posefit/ui/PosefitApp.kt

@@ -0,0 +1,376 @@
+package com.kimgo.posefit.ui
+
+import android.content.Context
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Button
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TextField
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.kimgo.posefit.sender.CameraCatalog
+import com.kimgo.posefit.sender.CameraFacing
+import com.kimgo.posefit.sender.CameraOption
+import com.kimgo.posefit.sender.StreamResolution
+import com.kimgo.posefit.settings.StreamSettings
+
+@Composable
+fun PosefitApp(
+    context: Context,
+    initialSettings: StreamSettings,
+    isInitiallyStreaming: Boolean,
+    onStartStreaming: (StreamSettings, (Boolean) -> Unit) -> Unit,
+    onStopStreaming: () -> Unit,
+    onSaveSettings: (StreamSettings) -> Unit,
+    onApplyOrientation: (StreamSettings) -> Unit,
+) {
+    var screen by remember { mutableStateOf(AppScreen.HOME) }
+    var isStreaming by remember { mutableStateOf(isInitiallyStreaming) }
+    var settings by remember { mutableStateOf(initialSettings) }
+
+    when (screen) {
+        AppScreen.HOME -> HomeScreen(
+            isStreaming = isStreaming,
+            settings = settings,
+            onToggleStreaming = {
+                if (isStreaming) {
+                    onStopStreaming()
+                    isStreaming = false
+                } else {
+                    onSaveSettings(settings)
+                    onApplyOrientation(settings)
+                    onStartStreaming(settings) { granted ->
+                        isStreaming = granted
+                    }
+                }
+            },
+            onOpenSettings = { screen = AppScreen.SETTINGS },
+            onRotate = {
+                val updated = settings.copy(orientation = settings.orientation.next())
+                settings = updated
+                onSaveSettings(updated)
+                onApplyOrientation(updated)
+            },
+        )
+
+        AppScreen.SETTINGS -> SettingsScreen(
+            context = context,
+            initialSettings = settings,
+            isStreaming = isStreaming,
+            onSave = { updated ->
+                settings = updated
+                onSaveSettings(updated)
+                screen = AppScreen.HOME
+            },
+            onBack = { screen = AppScreen.HOME },
+        )
+    }
+}
+
+@Composable
+private fun HomeScreen(
+    isStreaming: Boolean,
+    settings: StreamSettings,
+    onToggleStreaming: () -> Unit,
+    onOpenSettings: () -> Unit,
+    onRotate: () -> Unit,
+) {
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+    ) {
+        Row(
+            modifier = Modifier.align(Alignment.TopEnd),
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            TextButton(onClick = onRotate) {
+                Text("旋转")
+            }
+            TextButton(
+                onClick = onOpenSettings,
+                enabled = !isStreaming,
+            ) {
+                Text("设置")
+            }
+        }
+
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(horizontal = 24.dp),
+            verticalArrangement = Arrangement.Center,
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Text(
+                text = "PoseFit",
+                style = MaterialTheme.typography.headlineLarge,
+                fontWeight = FontWeight.Bold,
+                color = MaterialTheme.colorScheme.primary,
+            )
+            Spacer(modifier = Modifier.height(12.dp))
+            Text(
+                text = if (isStreaming) {
+                    "正在推流：${settings.resolution.label} ${settings.orientation.label}"
+                } else {
+                    "未推流：${settings.resolution.label} ${settings.orientation.label}"
+                },
+                style = MaterialTheme.typography.titleMedium,
+                color = if (isStreaming) {
+                    MaterialTheme.colorScheme.primary
+                } else {
+                    MaterialTheme.colorScheme.onSurfaceVariant
+                },
+            )
+            Spacer(modifier = Modifier.height(24.dp))
+            Button(
+                onClick = onToggleStreaming,
+                modifier = Modifier
+                    .fillMaxWidth(0.72f)
+                    .height(56.dp),
+            ) {
+                Text(if (isStreaming) "停止推流" else "开始推流")
+            }
+        }
+    }
+}
+
+@Composable
+private fun SettingsScreen(
+    context: Context,
+    initialSettings: StreamSettings,
+    isStreaming: Boolean,
+    onSave: (StreamSettings) -> Unit,
+    onBack: () -> Unit,
+) {
+    var url by remember { mutableStateOf(initialSettings.signalingUrl) }
+    var cameraFacing by remember { mutableStateOf(initialSettings.cameraFacing) }
+    var selectedCameraName by remember { mutableStateOf(initialSettings.cameraName) }
+    var selectedResolution by remember { mutableStateOf(initialSettings.resolution) }
+    var cameraMenuExpanded by remember { mutableStateOf(false) }
+    var resolutionMenuExpanded by remember { mutableStateOf(false) }
+    val cameraOptions = remember { runCatching { CameraCatalog.listOptions(context) }.getOrDefault(emptyList()) }
+    val selectedCameraOption = remember(selectedCameraName, cameraOptions) {
+        resolveSelectedCameraOption(cameraOptions, selectedCameraName)
+    }
+    val availableResolutions = remember(selectedCameraOption) {
+        selectedCameraOption?.supportedResolutions
+            ?.takeIf { it.isNotEmpty() }
+            ?: StreamResolution.PRESETS
+    }
+    val effectiveResolution = remember(availableResolutions, selectedResolution) {
+        chooseResolution(availableResolutions, selectedResolution)
+    }
+    val selectedCameraLabel = remember(selectedCameraName, selectedCameraOption) {
+        if (selectedCameraName.isNullOrBlank()) {
+            "自动选择后置最广角"
+        } else {
+            selectedCameraOption?.label ?: "自动选择后置最广角"
+        }
+    }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .verticalScroll(rememberScrollState())
+            .padding(horizontal = 28.dp, vertical = 20.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp),
+    ) {
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Text(
+                text = "设置",
+                style = MaterialTheme.typography.headlineSmall,
+                fontWeight = FontWeight.Bold,
+            )
+            TextButton(onClick = onBack) {
+                Text("返回")
+            }
+        }
+
+        TextField(
+            value = url,
+            onValueChange = { url = it },
+            label = { Text("WS 服务器地址") },
+            modifier = Modifier.fillMaxWidth(),
+            singleLine = true,
+            enabled = !isStreaming,
+        )
+
+        SettingGroup(title = "摄像头") {
+            Box(modifier = Modifier.fillMaxWidth()) {
+                OutlinedButton(
+                    onClick = { cameraMenuExpanded = true },
+                    enabled = !isStreaming,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .height(48.dp),
+                ) {
+                    Text(selectedCameraLabel, maxLines = 1)
+                }
+                DropdownMenu(
+                    expanded = cameraMenuExpanded,
+                    onDismissRequest = { cameraMenuExpanded = false },
+                ) {
+                    DropdownMenuItem(
+                        text = { Text("自动选择后置最广角") },
+                        onClick = {
+                            cameraFacing = CameraFacing.BACK
+                            selectedCameraName = null
+                            selectedResolution = chooseResolution(
+                                resolveSelectedCameraOption(cameraOptions, null)
+                                    ?.supportedResolutions
+                                    ?.takeIf { it.isNotEmpty() }
+                                    ?: StreamResolution.PRESETS,
+                                selectedResolution,
+                            )
+                            cameraMenuExpanded = false
+                        },
+                    )
+                    cameraOptions.forEach { option ->
+                        DropdownMenuItem(
+                            text = { Text(option.label) },
+                            onClick = {
+                                cameraFacing = option.facing
+                                selectedCameraName = option.name
+                                selectedResolution = chooseResolution(
+                                    option.supportedResolutions.takeIf { it.isNotEmpty() }
+                                        ?: StreamResolution.PRESETS,
+                                    selectedResolution,
+                                )
+                                cameraMenuExpanded = false
+                            },
+                        )
+                    }
+                }
+            }
+        }
+
+        SettingGroup(title = "推流分辨率") {
+            Box(modifier = Modifier.fillMaxWidth()) {
+                OutlinedButton(
+                    onClick = { resolutionMenuExpanded = true },
+                    enabled = !isStreaming,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .height(48.dp),
+                ) {
+                    Text(effectiveResolution.label, maxLines = 1)
+                }
+                DropdownMenu(
+                    expanded = resolutionMenuExpanded,
+                    onDismissRequest = { resolutionMenuExpanded = false },
+                ) {
+                    availableResolutions.forEach { resolution ->
+                        DropdownMenuItem(
+                            text = { Text(resolution.label) },
+                            onClick = {
+                                selectedResolution = resolution
+                                resolutionMenuExpanded = false
+                            },
+                        )
+                    }
+                }
+            }
+        }
+
+        Button(
+            onClick = {
+                onSave(
+                    StreamSettings(
+                        signalingUrl = url.trim(),
+                        cameraFacing = cameraFacing,
+                        cameraName = selectedCameraName,
+                        resolution = effectiveResolution,
+                        orientation = initialSettings.orientation,
+                    )
+                )
+            },
+            modifier = Modifier
+                .fillMaxWidth()
+                .height(52.dp),
+        ) {
+            Text("保存设置")
+        }
+    }
+}
+
+@Composable
+private fun SettingGroup(
+    title: String,
+    content: @Composable ColumnScope.() -> Unit,
+) {
+    Column(
+        modifier = Modifier.fillMaxWidth(),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        Text(
+            text = title,
+            style = MaterialTheme.typography.titleSmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        content()
+    }
+}
+
+private fun resolveSelectedCameraOption(
+    cameraOptions: List<CameraOption>,
+    selectedCameraName: String?,
+): CameraOption? {
+    if (!selectedCameraName.isNullOrBlank()) {
+        return cameraOptions.firstOrNull { it.name == selectedCameraName }
+    }
+
+    return cameraOptions
+        .filter { it.facing == CameraFacing.BACK }
+        .minByOrNull { it.minFocalLength ?: Float.MAX_VALUE }
+        ?: cameraOptions.firstOrNull()
+}
+
+private fun chooseResolution(
+    availableResolutions: List<StreamResolution>,
+    currentResolution: StreamResolution,
+): StreamResolution {
+    if (availableResolutions.isEmpty()) {
+        return StreamResolution.DEFAULT
+    }
+    if (currentResolution in availableResolutions) {
+        return currentResolution
+    }
+    if (StreamResolution.DEFAULT in availableResolutions) {
+        return StreamResolution.DEFAULT
+    }
+    return availableResolutions.minByOrNull {
+        kotlin.math.abs((it.width * it.height) - (StreamResolution.DEFAULT.width * StreamResolution.DEFAULT.height))
+    } ?: availableResolutions.first()
+}
+
+private enum class AppScreen {
+    HOME,
+    SETTINGS,
+}