[feat] add configurable landscape entry for mobile sessions

apps/android/README.md

@@ -9,6 +9,7 @@
 - 48 kHz 单声道 PCM 播放，支持静音，音频队列有容量限制。
 - 相对鼠标（触控板）和绝对位置模式；单指点击、绝对模式按住拖动、长按右键，以及外接键盘、鼠标。画面手势与 iOS 一致：双指可在整个触控区域（包括画面外黑边）捏合，以触点为中心缩放（1–10 倍），放大后双指拖动画面，原始比例下双指上下滑动控制滚轮。相对鼠标移到可见画面的上、下边缘后继续向外移动，会反向上下平移画面，不触发左右平移；未放大时和按住虚拟鼠标键拖动时同样生效，停止移动即停止平移，抬手保留位置。移动到极限时，画面可见部分至少占当前显示区域高度的 20%，与缩放倍数无关；整幅画面高度不足该比例时完整保留，范围计入上下黑边；缩放结束及缩回 1 倍时保留平移位置，仅在超过可见边界时限制位置；切换显示器恢复居中。
 - 横竖屏等比例显示、远端多显示器切换。与 iOS 一致的画面质量（低/中/高）、采集帧率（30/60 fps）、画面偏好；支持能力检测、电脑端确认、失败/5 秒超时回退及连续操作的应答排序。
+- “设置 → 屏幕方向 → 连接后自动横屏”默认开启并保存在本机。手机进入会话后先保持横屏，检测到手机实际横过来后才恢复跟随设备方向；竖持或平放不会立即切回竖屏。关闭后沿用自动旋转，平板与多窗口不受此选项影响。退出会话恢复首页方向，返回同一后台会话不重复锁定已解锁的方向。
 - 根据常见移动设备解码能力和屏幕尺寸设置起始参数：显示长边不超过 1280 像素时默认低画质（最高 720p）/30 fps，其余默认中画质（最高 1080p）/30 fps。用户保存的画面偏好不变，仍可手动选择高画质或 60 fps。
 - 网络状态按视频、音频、数据、合计展示收发速率和丢包率，并显示实际提交帧率、分辨率、画面延时、平滑 RTT、P2P/TURN 和实际 SRTP 状态。每秒刷新，过期或无效测量显示“—”。
 - 可拖动的悬浮控制球、三列控制菜单；默认使用系统输入法，保留候选词、纠错和听写，确认文字后直接输入远端。电脑键盘固定底部，分“字母数字 / 符号功能”两页，共用末两行布局，按系统键盘高度适配横竖屏；统一切换、收起按钮和 Android 键盘触感反馈。

apps/android/app/src/main/java/cn/crossdesk/mobile/BackgroundSession.java

@@ -19,6 +19,7 @@ final class BackgroundSession implements NativeSession.Listener {
     RemoteVideoSettings videoSettings;
     int signalState, selectedDisplay, width, height;
     boolean muted, remoteServiceAvailable, background, ended;
+    boolean waitingForLandscape;
     File receivedFile;
 
     BackgroundSession(Context context, NativeSession session, String host, int port, String remote) {

apps/android/app/src/main/java/cn/crossdesk/mobile/MainActivity.java

@@ -72,6 +72,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     private int videoWidth,videoHeight;
     private final RemotePictureInPicture pictureInPicture=new RemotePictureInPicture();
     private RemoteVideoView video;
+    private RemoteOrientation remoteOrientation;
     private SessionControls controls;
     private Dialog passwordDialog, progressDialog, privacyDialog;
     private AlertDialog disconnectDialog;
@@ -95,7 +96,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     private Runnable backAction;
 
     @Override public void onCreate(Bundle state){
-        super.onCreate(state);ui=new MobileUi(this);history=new RecentConnections(this);
+        super.onCreate(state);ui=new MobileUi(this);history=new RecentConnections(this);remoteOrientation=new RemoteOrientation(this);
         pageHost=new PageHost(this);setContentView(pageHost);
         preferences=getSharedPreferences("settings",MODE_PRIVATE);host=preferences.getString("host","api.crossdesk.cn");port=preferences.getInt("port",9099);
         recentPresence.sender=ids->{if(signaling!=null&&!signaling.isClosed())signaling.presenceRequest(ids);};
@@ -178,14 +179,18 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         TextView chevron=text(" ›",23,false);chevron.setTextColor(0xFFB7B7BD);item.addView(chevron);item.setContentDescription(title+(detail.isEmpty()?"":"，"+detail));item.setClickable(true);item.setFocusable(true);item.setOnClickListener(v->action.run());parent.addView(item);
         return item;
     }
-    @android.annotation.SuppressLint("SourceLockedOrientationActivity") // Phones keep the portrait home; tablets and multi-window follow user rotation settings.
-    private void updateHomeOrientation(){
+    private boolean isTablet(){
         boolean tablet=getResources().getConfiguration().smallestScreenWidthDp>=600;
         if(android.os.Build.VERSION.SDK_INT>=30){
             android.graphics.Rect bounds=getWindowManager().getMaximumWindowMetrics().getBounds();
             tablet|=Math.min(bounds.width(),bounds.height())>=dp(600);
         }
-        int orientation=tablet||isInMultiWindowMode()?ActivityInfo.SCREEN_ORIENTATION_FULL_USER:ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
+        return tablet;
+    }
+    @android.annotation.SuppressLint("SourceLockedOrientationActivity") // Phones keep the portrait home; tablets and multi-window follow user rotation settings.
+    private void updateHomeOrientation(){
+        remoteOrientation.end();
+        int orientation=isTablet()||isInMultiWindowMode()?ActivityInfo.SCREEN_ORIENTATION_FULL_USER:ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
         if(getRequestedOrientation()!=orientation)setRequestedOrientation(orientation);
     }
     private void home(String message){
@@ -321,8 +326,8 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         ProgressBar spinner=new ProgressBar(this);spinner.setIndeterminateTintList(ColorStateList.valueOf(BLUE));body.addView(spinner,ui.size(34,34));ui.gap(body,14);TextView title=text("正在连接",20,true);title.setGravity(Gravity.CENTER);body.addView(title);ui.gap(body,6);status=text("正在连接信令服务器…",14,false);status.setGravity(Gravity.CENTER);status.setTextColor(SECONDARY);status.setMinHeight(dp(36));body.addView(status);card.addView(body,ui.size(-1,-2));ui.divider(card);card.addView(ui.action("取消连接",RED,()->end("")),ui.size(-1,46));
         dialog.setContentView(card);dialog.setCanceledOnTouchOutside(false);dialog.setOnCancelListener(d->end(""));Window w=dialog.getWindow();if(w!=null){w.setBackgroundDrawableResource(android.R.color.transparent);w.setDimAmount(.08f);}dialog.show();if(w!=null)w.setLayout(dp(292),-2);
     }
-    private void sessionScreen(){
-        installRoot("session",true);setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);video=new RemoteVideoView(this,session);video.setRelative(preferences.getBoolean("relativeMouse",true));canvas.addView(video,0,new FrameLayout.LayoutParams(-1,-1));
+    private void sessionScreen(boolean waitForLandscape){
+        installRoot("session",true);remoteOrientation.begin(waitForLandscape&&!isTablet()&&!isInMultiWindowMode());video=new RemoteVideoView(this,session);video.setRelative(preferences.getBoolean("relativeMouse",true));canvas.addView(video,0,new FrameLayout.LayoutParams(-1,-1));
         controls=new SessionControls(this,ui,new SessionControls.Actions(){
             public void disconnect(){confirmDisconnect();}public void display(){selectDisplay();}public void clipboard(){MainActivity.this.clipboard();}
             public void sendFile(){chooseFile();}public void saveFile(){saveReceivedFile();}public void secureAttention(){MainActivity.this.secureAttention();}
@@ -343,6 +348,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     }
     private void confirmDisconnect(){disconnectDialog=new AlertDialog.Builder(this).setTitle("断开远程连接？").setMessage("断开后将返回首页").setNegativeButton("取消",null).setPositiveButton("断开连接",(d,w)->end("")).show();}
     private void end(String reason){
+        remoteOrientation.end();
         if(backgroundSession!=null){BackgroundSession retained=backgroundSession;backgroundSession=null;retained.detach(this);retained.finish(reason);}
         boolean closeWindow=isInPictureInPictureMode();
         pictureInPicture.disconnect();updatePictureInPicture();
@@ -362,6 +368,9 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         mouse.addView(segments(new String[]{"相对位置","绝对位置"},relative?0:1,true,index->preferences.edit().putBoolean("relativeMouse",index==0).apply()));
         LinearLayout picture=section(content,"画面偏好",MobileUi.SETTINGS_CARD_RADIUS);picture.setPadding(dp(12),dp(12),dp(12),dp(12));int preference=Math.max(0,Math.min(2,preferences.getInt("videoPreference",1)));
         picture.addView(segments(RemoteVideoSettings.PREFERENCES,preference,true,index->preferences.edit().putInt("videoPreference",index).apply()));ui.gap(content,28);
+        LinearLayout direction=section(content,"屏幕方向",MobileUi.SETTINGS_CARD_RADIUS);LinearLayout directionRow=row();directionRow.setPadding(dp(16),dp(10),dp(16),dp(10));directionRow.addView(text("连接后自动横屏",16,false),new LinearLayout.LayoutParams(0,-2,1));
+        Switch autoLandscape=new Switch(this);autoLandscape.setContentDescription("连接后自动横屏");autoLandscape.setChecked(preferences.getBoolean("autoLandscape",true));autoLandscape.setOnCheckedChangeListener((button,checked)->preferences.edit().putBoolean("autoLandscape",checked).apply());directionRow.addView(autoLandscape);direction.addView(directionRow);
+        footer(content,"手机连接后先进入横屏，将手机横过来后恢复跟随设备方向。关闭后始终跟随设备方向。平板和多窗口不受影响。");
         LinearLayout server=section(content,"",MobileUi.SETTINGS_CARD_RADIUS);LinearLayout fields=column();fields.setVisibility(View.GONE);boolean custom=!host.equals("api.crossdesk.cn")||port!=9099;
         link(server,"服务器",custom?"自定义":"默认",()->fields.setVisibility(fields.getVisibility()==View.VISIBLE?View.GONE:View.VISIBLE));server.addView(fields);
         LinearLayout toggleRow=row();toggleRow.setPadding(dp(16),dp(8),dp(16),dp(8));toggleRow.addView(text("使用自定义服务器",16,false),new LinearLayout.LayoutParams(0,-2,1));Switch toggle=new Switch(this);toggle.setContentDescription("使用自定义服务器");toggle.setChecked(custom);toggleRow.addView(toggle);fields.addView(toggleRow);
@@ -593,7 +602,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         // Transport readiness can be reported again after ICE changes its selected path.
         // The first success consumes pendingPassword; a duplicate must not save it again.
         if(session==null||ready)return;ready=true;if(progressDialog!=null){progressDialog.dismiss();progressDialog=null;}
-        try{history.save(serverKey(),connectedRemote,connectedRemote,hostPlatform,rememberPassword,pendingPassword);}catch(Exception error){toast("密码保存失败，本次连接仍可使用");}pendingPassword="";sessionScreen();
+        try{history.save(serverKey(),connectedRemote,connectedRemote,hostPlatform,rememberPassword,pendingPassword);}catch(Exception error){toast("密码保存失败，本次连接仍可使用");}pendingPassword="";sessionScreen(preferences.getBoolean("autoLandscape",true));
         if(!canUsePictureInPicture())prepareBackgroundSession(true);
         if(videoSettings.supported&&videoSettings.requestId==0)updateVideoSettings(videoSettings.selection);
         if(foreground&&preferences.getBoolean("networkConsent",false))remoteVersionCheck.connected();
@@ -670,6 +679,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         super.onConfigurationChanged(config);
         releaseKeys();
         if(!page.equals("session"))updateHomeOrientation();
+        else if(!isInPictureInPictureMode()&&(isTablet()||isInMultiWindowMode()))remoteOrientation.followDevice();
         sizePasswordDialog();
         if(privacyDialog instanceof PrivacyConsentDialog)((PrivacyConsentDialog)privacyDialog).updateSize();
         if(controls!=null&&!pictureInPictureUi)controls.post(controls::constrainPanels);
@@ -688,6 +698,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         retained.muted=muted;retained.selectedDisplay=selectedDisplay;retained.remoteServiceAvailable=remoteServiceAvailable;
         retained.clipboard=remoteClipboard;retained.videoSettings=videoSettings;retained.receivedFile=receivedFile;
         retained.width=videoWidth;retained.height=videoHeight;
+        retained.waitingForLandscape=remoteOrientation.waitingForLandscape();
     }
     private boolean prepareBackgroundSession(boolean inform){
         if(!ready||session==null||session.isClosed()||isFinishing()||!hasNetworkConsent())return false;
@@ -723,7 +734,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         hostPlatform=retained.platform;displays=retained.displays;muted=retained.muted;selectedDisplay=retained.selectedDisplay;
         remoteServiceAvailable=retained.remoteServiceAvailable;remoteClipboard=retained.clipboard;receivedFile=retained.receivedFile;
         videoSettings=retained.videoSettings;ready=true;retained.attach(this);
-        if(rebuild)sessionScreen();
+        if(rebuild)sessionScreen(retained.waitingForLandscape);
         if(retained.width>0&&retained.height>0)videoSize(retained.width,retained.height);
         if(controls!=null){controls.setMuted(muted);controls.videoSettings(videoSettings);controls.fileStatus(retained.fileStatus,receivedFile!=null);}
         retained.setBackground(false);signaling(signalState,localIdentity);
@@ -771,9 +782,9 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         super.onPictureInPictureUiStateChanged(state);
         if(android.os.Build.VERSION.SDK_INT>=35&&state.isTransitioningToPip())setPictureInPictureUi(true);
     }
-    @Override protected void onResume(){super.onResume();if(!isInPictureInPictureMode())enteredPictureInPicture=false;setPictureInPictureUi(isInPictureInPictureMode());updatePictureInPicture();if(ready&&!canUsePictureInPicture())prepareBackgroundSession(true);if(backgroundSession!=null)requestBackgroundNotifications();}
+    @Override protected void onResume(){super.onResume();remoteOrientation.resume();if(!isInPictureInPictureMode())enteredPictureInPicture=false;setPictureInPictureUi(isInPictureInPictureMode());updatePictureInPicture();if(ready&&!canUsePictureInPicture())prepareBackgroundSession(true);if(backgroundSession!=null)requestBackgroundNotifications();}
     // onStart marks a new visit; focus/resume callbacks must not reopen a refused notice.
-    @Override protected void onPause(){releaseKeys();if(controls!=null)controls.cancelMouseInput();if(video!=null)video.releaseMouse();super.onPause();}
+    @Override protected void onPause(){remoteOrientation.pause();releaseKeys();if(controls!=null)controls.cancelMouseInput();if(video!=null)video.releaseMouse();super.onPause();}
     @Override protected void onStart(){super.onStart();foreground=true;restoreBackgroundSession();appUpdates.setEnabled(preferences.getBoolean("networkConsent",false));if(!preferences.getBoolean("networkConsent",false))consent(this::renderSignaling);ensureSignaling();showConnectionMessage();}
     @Override protected void onStop(){if(controls!=null)controls.closeKeyboard();foreground=false;appUpdates.setEnabled(false);if(privacyDialog!=null)privacyDialog.dismiss();pageHost.finish();
         if(connectionDialog!=null)connectionDialog.dismiss();
@@ -791,5 +802,5 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         boolean retained=!isFinishing()&&backgroundSession!=null&&!backgroundSession.ended&&RemoteSessionService.current()==backgroundSession;
         if(backgroundSession!=null)backgroundSession.detach(this);
         if(!retained){if(session!=null)session.close();stopSignaling();}else{mainHandler.removeCallbacks(presenceTick);session=signaling=null;}
-        super.onDestroy();}
+        remoteOrientation.end();super.onDestroy();}
 }

apps/android/app/src/main/java/cn/crossdesk/mobile/RemoteOrientation.java

@@ -0,0 +1,57 @@
+package cn.crossdesk.mobile;
+
+import android.app.Activity;
+import android.content.pm.ActivityInfo;
+import android.view.OrientationEventListener;
+
+/** Holds the initial landscape until the phone itself has been turned sideways. */
+final class RemoteOrientation {
+    private final Activity activity;
+    private final OrientationEventListener sensor;
+    private boolean waitingForLandscape, resumed;
+
+    RemoteOrientation(Activity activity) {
+        this.activity = activity;
+        sensor = new OrientationEventListener(activity) {
+            @Override public void onOrientationChanged(int degrees) {
+                if (!resumed || !waitingForLandscape || activity.isInPictureInPictureMode()) return;
+                // Use physical orientation, never the window rotated by our own request.
+                // Ignore flat/unknown poses and keep a margin away from the diagonal.
+                if ((degrees >= 60 && degrees <= 120) || (degrees >= 240 && degrees <= 300)) {
+                    followDevice();
+                }
+            }
+        };
+    }
+
+    void begin(boolean autoLandscape) {
+        sensor.disable();
+        waitingForLandscape = autoLandscape && sensor.canDetectOrientation();
+        apply();
+        if (resumed && waitingForLandscape) sensor.enable();
+    }
+
+    boolean waitingForLandscape() { return waitingForLandscape; }
+
+    void resume() {
+        resumed = true;
+        if (waitingForLandscape && !activity.isInPictureInPictureMode()) sensor.enable();
+    }
+
+    void pause() { resumed = false; sensor.disable(); }
+
+    void end() { waitingForLandscape = false; sensor.disable(); }
+
+    void followDevice() {
+        waitingForLandscape = false;
+        sensor.disable();
+        apply();
+    }
+
+    private void apply() {
+        int orientation = waitingForLandscape
+            ? ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE
+            : ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR;
+        if (activity.getRequestedOrientation() != orientation) activity.setRequestedOrientation(orientation);
+    }
+}

apps/harmony/README.md

@@ -9,6 +9,8 @@
 
 两者仍为开发版。已完成的模拟器验证及未完成的真机验收见各端说明。
 
+手机控制端的“设置 → 屏幕方向 → 连接后自动横屏”默认开启并保存在本机。连接后先保持横屏，检测到手机实际横过来后恢复跟随设备方向；竖持、平放或斜持不会解除初始横屏。关闭后沿用自动旋转，平板和多窗口不受此选项影响。退出会话恢复首页方向，返回同一后台会话不重复锁定已解锁的方向；重力传感器不可用时沿用自动旋转。
+
 ## 构建
 
 在仓库根目录执行，当前构建脚本面向 macOS：

apps/harmony/entry/src/main/ets/mobile/MobileController.ets

@@ -50,6 +50,7 @@ export class MobileState {
   muted: boolean = false;
   previews: boolean = false;
   videoPreference: number = 1;
+  autoLandscape: boolean = true;
   version: string = '0.1.0';
   update: string = '';
   updateStatus: string = '';
@@ -122,6 +123,7 @@ export class MobileController {
     this.state.consent = this.store.flag('consent'); this.state.server = this.store.text('server', 'api.crossdesk.cn');
     this.state.port = this.store.text('port', '9099'); this.state.remote = this.store.text('lastRemote');
     this.state.relative = this.store.flag('relative', true); this.state.videoPreference = this.store.number('videoPreference', 1);
+    this.state.autoLandscape = this.store.flag('autoLandscape', true);
     this.state.previews = this.store.flag('previews');
     try { this.state.version = bundleManager.getBundleInfoForSelfSync(bundleManager.BundleFlag.GET_BUNDLE_INFO_DEFAULT).versionName; } catch {}
     try {
@@ -280,6 +282,7 @@ export class MobileController {
     this.settingsTimeout = setTimeout(() => { this.video.expire(id); this.syncVideo(); }, 5000); this.syncVideo();
   }
   setPreference(value: number): void { this.store.put('videoPreference', value); this.state.videoPreference = value; }
+  setAutoLandscape(value: boolean): void { this.store.put('autoLandscape', value); this.state.autoLandscape = value; }
   setPreviews(value: boolean): void {
     this.store.put('previews', value); this.state.previews = value;
     if (!value) { this.send({ op: 'cancelPreview' }); this.previewEligible = false; this.store.clearPreviews(); this.history(); }
@@ -427,7 +430,7 @@ export class MobileController {
         this.history();
       }
     }).catch(() => this.toast('密码保存失败，本次连接仍可使用'));
-    this.platform.connected();
+    this.platform.connected(this.state.autoLandscape);
     if (this.video.supported && this.video.requestId === 0) this.updateVideo(0, this.video.selection.quality);
     if (this.receivedHostInfo) this.checkRemote(this.remoteVersion);
   }

apps/harmony/entry/src/main/ets/mobile/MobilePlatform.ets

@@ -4,6 +4,7 @@ import { PiPWindow, window, display } from '@kit.ArkUI';
 import { backgroundTaskManager } from '@kit.BackgroundTasksKit';
 import { picker, fileIo as fs, fileUri } from '@kit.CoreFileKit';
 import { http } from '@kit.NetworkKit';
+import { sensor } from '@kit.SensorServiceKit';
 import { isAnnouncementURL } from './AnnouncementText';
 
 export class MobileLifecycle {
@@ -21,6 +22,19 @@ export class MobilePlatform {
   private generation: number = 0;
   private backgroundActive: boolean = false;
   private active: boolean = false;
+  private waitingForLandscape: boolean = false;
+  private observingOrientation: boolean = false;
+  private orientationRevision: number = 0;
+  private orientationQueue: Promise<void> = Promise.resolve();
+  private gravityChanged: (data: sensor.GravityResponse) => void = (data: sensor.GravityResponse) => {
+    if (!this.active || !this.foreground || !this.waitingForLandscape || !this.observingOrientation) return;
+    // Gravity is in device coordinates, independent of programmatic window rotation.
+    // Reject flat and diagonal poses before handing rotation back to the system.
+    const x = Math.abs(data.x), y = Math.abs(data.y), z = Math.abs(data.z);
+    if (x >= 6 && x >= y * 1.7 && x >= z) {
+      this.waitingForLandscape = false; this.stopOrientationSensor(); this.orientation(true);
+    }
+  };
   private foreground: boolean = true;
   choosing: boolean = false;
   pipActive: boolean = false;
@@ -37,7 +51,9 @@ export class MobilePlatform {
     this.context = context; this.ended = ended; this.release = release; this.feedback = feedback;
     try { backgroundTaskManager.on('continuousTaskCancel', this.backgroundCancelled); } catch {}
   }
-  async connected(): Promise<void> {
+  async connected(autoLandscape: boolean = true): Promise<void> {
+    if (this.active) return;
+    this.waitingForLandscape = autoLandscape && deviceInfo.deviceType === 'phone';
     this.active = true; const generation = ++this.generation;
     this.muted = false; this.orientation(true);
     this.backgroundQueue = this.backgroundQueue.then(async () => {
@@ -90,7 +106,7 @@ export class MobilePlatform {
   }
   videoSize(width: number, height: number): void { try { this.pip?.updateContentSize(width, height); } catch { /* Not supported on this device. */ } }
   async background(): Promise<void> {
-    this.foreground = false; this.release(); this.cancelRequests();
+    this.foreground = false; this.stopOrientationSensor(); this.release(); this.cancelRequests();
     this.onVisibility(this.pipActive);
     if (!this.active) return;
     const generation = this.generation;
@@ -109,6 +125,7 @@ export class MobilePlatform {
   }
   dispose(): void { this.disconnect(); try { backgroundTaskManager.off('continuousTaskCancel', this.backgroundCancelled); } catch {} }
   disconnect(): void {
+    this.waitingForLandscape = false; this.stopOrientationSensor();
     this.active = false; this.choosing = false; this.generation++; this.cancelRequests();
     const pip = this.pip; this.pip = undefined; this.pipActive = false;
     if (pip) { try { pip.setAutoStartEnabled(false); pip.stopPiP().catch(() => {}); } catch { /* Already stopped. */ } }
@@ -117,18 +134,46 @@ export class MobilePlatform {
     });
     this.orientation(false);
   }
-  private async orientation(session: boolean): Promise<void> {
-    const generation = this.generation;
+  private stopOrientationSensor(): void {
+    if (!this.observingOrientation) return;
+    this.observingOrientation = false;
+    try { sensor.off(sensor.SensorId.GRAVITY, this.gravityChanged); } catch {}
+  }
+  private startOrientationSensor(): void {
+    if (!this.waitingForLandscape || !this.foreground || this.observingOrientation) return;
     try {
-      const win = await window.getLastWindow(this.context);
-      if (generation !== this.generation) return;
-      await win.setWindowKeepScreenOn(session);
-      if (generation !== this.generation) return;
-      // Tablets and resizable windows follow the user orientation in both views.
-      const phone = deviceInfo.deviceType === 'phone';
-      const narrow = win.getWindowProperties().windowRect.width / display.getDefaultDisplaySync().densityPixels < 600;
-      await win.setPreferredOrientation(!session && phone && narrow ? window.Orientation.PORTRAIT : window.Orientation.AUTO_ROTATION);
-    } catch { /* Window may already be going away. */ }
+      sensor.getSingleSensorSync(sensor.SensorId.GRAVITY);
+      sensor.on(sensor.SensorId.GRAVITY, this.gravityChanged, { interval: 100000000 });
+      this.observingOrientation = true;
+    } catch {
+      // A phone without a usable sensor keeps the previous system-following policy.
+      this.waitingForLandscape = false;
+    }
+  }
+  private orientation(session: boolean): void {
+    const generation = this.generation;
+    const revision = ++this.orientationRevision;
+    // Serialize window requests so an earlier landscape request cannot win after
+    // the sensor has released it or the session has disconnected.
+    this.orientationQueue = this.orientationQueue.then(async () => {
+      if (generation !== this.generation || revision !== this.orientationRevision) return;
+      try {
+        const win = await window.getLastWindow(this.context);
+        if (generation !== this.generation || revision !== this.orientationRevision) return;
+        await win.setWindowKeepScreenOn(session);
+        if (generation !== this.generation || revision !== this.orientationRevision) return;
+        // Tablets and resizable windows follow the user orientation in both views.
+        const phone = deviceInfo.deviceType === 'phone';
+        const rect = win.getWindowProperties().windowRect;
+        const narrow = Math.min(rect.width, rect.height) / display.getDefaultDisplaySync().densityPixels < 600;
+        const fullScreen = win.getWindowStatus() === window.WindowStatusType.FULL_SCREEN;
+        if (!phone || !narrow || !fullScreen) { this.waitingForLandscape = false; this.stopOrientationSensor(); }
+        if (session) this.startOrientationSensor();
+        const orientation = !session && phone && narrow && fullScreen ? window.Orientation.PORTRAIT :
+          session && this.waitingForLandscape ? window.Orientation.AUTO_ROTATION_LANDSCAPE : window.Orientation.AUTO_ROTATION;
+        await win.setPreferredOrientation(orientation);
+      } catch { /* Window may already be going away. */ }
+    });
   }
   private setChoosing(value: boolean): void {
     this.choosing = value; this.release();

apps/harmony/entry/src/main/ets/pages/Mobile.ets

@@ -267,6 +267,15 @@ struct Mobile {
         MobileSegment({ labels: ['帧率优先', '画质优先', '平衡'], selection: this.state.videoPreference,
           changed: (i: number) => this.controller?.setPreference(i) })
       }.padding(12).width('100%').backgroundColor(Color.White).borderRadius(26).border({ width: 0.5, color: MobileTheme.line })
+      this.SectionTitle('屏幕方向')
+      Row() {
+        Text('连接后自动横屏').fontSize(16).fontColor(MobileTheme.ink).layoutWeight(1)
+        Toggle({ type: ToggleType.Switch, isOn: this.state.autoLandscape }).selectedColor(MobileTheme.green)
+          .onChange((value: boolean) => this.controller?.setAutoLandscape(value)).accessibilityText('连接后自动横屏')
+      }.padding({ left: 16, right: 16, top: 10, bottom: 10 }).width('100%').backgroundColor(Color.White)
+        .borderRadius(26).border({ width: 0.5, color: MobileTheme.line })
+      Text('手机连接后先进入横屏，将手机横过来后恢复跟随设备方向。关闭后始终跟随设备方向。平板和多窗口不受影响。')
+        .fontSize(12).fontColor(MobileTheme.secondary).width('100%').padding({ left: 16, right: 16, top: 8, bottom: 12 })
       Column() {
         this.SettingRow('服务器', this.customServer ? '自定义' : '默认', () => this.serverExpanded = !this.serverExpanded)
         if (this.serverExpanded) {

apps/ios/CrossDeskMobile/ContentView.swift

@@ -75,7 +75,7 @@ struct ContentView: View {
         }
         .onAppear {
             if !session.sessionVisible {
-                AppOrientation.update(to: .portrait)
+                AppOrientation.endSession()
             }
             if scenePhase == .active {
                 session.applicationDidBecomeActive()
@@ -840,6 +840,11 @@ private struct ServerSettingsView: View {
                 }
                 .pickerStyle(.segmented)
             }
+            Section {
+                Toggle("连接后自动横屏", isOn: $session.autoLandscape)
+            } header: {
+                Text("屏幕方向")
+            }
             Section {
                 DisclosureGroup(isExpanded: $serverConfigurationExpanded) {
                     Toggle("使用自定义服务器", isOn: $usesCustomServer)

apps/ios/CrossDeskMobile/CrossDeskMobileApp.swift

@@ -12,24 +12,88 @@ final class CrossDeskAppDelegate: NSObject, UIApplicationDelegate {
     }
 }
 
+@MainActor
 enum AppOrientation {
-    static func update(to orientations: UIInterfaceOrientationMask) {
-        DispatchQueue.main.async {
-            // iPad windows can rotate and resize independently of the session.
-            // Keep all orientations available and let the window manager choose
-            // the geometry; the phone still locks the home screen to portrait.
-            guard UIDevice.current.userInterfaceIdiom != .pad else { return }
-            CrossDeskAppDelegate.supportedOrientations = orientations
+    nonisolated static let autoLandscapeKey = "crossdesk.mobile.auto-landscape"
+    private static var sessionActive = false
+    private static var waitingForLandscape = false
+    private static var deviceObserver: NSObjectProtocol?
 
-            for case let scene as UIWindowScene in UIApplication.shared.connectedScenes {
-                scene.windows.forEach {
-                    $0.rootViewController?.setNeedsUpdateOfSupportedInterfaceOrientations()
-                }
-                scene.requestGeometryUpdate(
-                    .iOS(interfaceOrientations: orientations)
-                ) { error in
-                    NSLog("CrossDesk orientation update failed: %@", error.localizedDescription)
-                }
+    nonisolated static func beginSession(autoLandscape: Bool) {
+        DispatchQueue.main.async { beginSessionOnMain(autoLandscape: autoLandscape) }
+    }
+
+    private static func beginSessionOnMain(autoLandscape: Bool) {
+        // Repeated transport-ready callbacks must not lock an existing session again.
+        guard !sessionActive else { return }
+        sessionActive = true
+        waitingForLandscape = autoLandscape && UIDevice.current.userInterfaceIdiom == .phone
+        if waitingForLandscape {
+            CrossDeskAppDelegate.supportedOrientations = .landscape
+            resumeObserving()
+        } else {
+            apply(to: .allButUpsideDown)
+        }
+    }
+
+    nonisolated static func endSession() {
+        DispatchQueue.main.async {
+            sessionActive = false
+            waitingForLandscape = false
+            stopObserving()
+            apply(to: .portrait)
+        }
+    }
+
+    nonisolated static func resume() {
+        DispatchQueue.main.async { resumeObserving() }
+    }
+
+    private static func resumeObserving() {
+        guard sessionActive, waitingForLandscape, deviceObserver == nil,
+              UIApplication.shared.applicationState == .active else { return }
+        apply(to: .landscape)
+        deviceObserver = NotificationCenter.default.addObserver(
+            forName: UIDevice.orientationDidChangeNotification, object: nil, queue: .main
+        ) { _ in
+            MainActor.assumeIsolated { deviceDidRotate() }
+        }
+        UIDevice.current.beginGeneratingDeviceOrientationNotifications()
+        deviceDidRotate()
+    }
+
+    nonisolated static func suspend() {
+        DispatchQueue.main.async { stopObserving() }
+    }
+
+    private static func stopObserving() {
+        guard let observer = deviceObserver else { return }
+        NotificationCenter.default.removeObserver(observer)
+        deviceObserver = nil
+        UIDevice.current.endGeneratingDeviceOrientationNotifications()
+    }
+
+    private static func deviceDidRotate() {
+        // UIDevice reports physical posture; window geometry also changes when
+        // we request landscape and must never release the initial lock itself.
+        guard sessionActive, waitingForLandscape, deviceObserver != nil,
+              UIApplication.shared.applicationState == .active,
+              UIDevice.current.orientation.isLandscape else { return }
+        waitingForLandscape = false
+        stopObserving()
+        apply(to: .allButUpsideDown)
+    }
+
+    private static func apply(to orientations: UIInterfaceOrientationMask) {
+        // iPad keeps every orientation available, including in resizable windows.
+        guard UIDevice.current.userInterfaceIdiom != .pad else { return }
+        CrossDeskAppDelegate.supportedOrientations = orientations
+        for case let scene as UIWindowScene in UIApplication.shared.connectedScenes {
+            scene.windows.forEach {
+                $0.rootViewController?.setNeedsUpdateOfSupportedInterfaceOrientations()
+            }
+            scene.requestGeometryUpdate(.iOS(interfaceOrientations: orientations)) { error in
+                NSLog("CrossDesk orientation update failed: %@", error.localizedDescription)
             }
         }
     }

apps/ios/CrossDeskMobile/RemoteSessionModel.swift

@@ -312,6 +312,9 @@ final class RemoteSessionModel: NSObject, ObservableObject, CrossDeskRTCBridgeDe
     @Published var videoAdaptationPolicy = VideoAdaptationPolicy.saved {
         didSet { videoAdaptationPolicy.save() }
     }
+    @Published var autoLandscape = UserDefaults.standard.object(forKey: AppOrientation.autoLandscapeKey) as? Bool ?? true {
+        didSet { UserDefaults.standard.set(autoLandscape, forKey: AppOrientation.autoLandscapeKey) }
+    }
     @Published private(set) var videoSettings = RemoteVideoSettingsState()
     @Published var remoteID = ""
     @Published var password = ""
@@ -437,6 +440,7 @@ final class RemoteSessionModel: NSObject, ObservableObject, CrossDeskRTCBridgeDe
 
     func applicationDidBecomeActive() {
         appIsActive = true
+        AppOrientation.resume()
         pictureInPicture.didBecomeActive()
         appUpdates.setEnabled(hasNetworkConsent)
         privacyNotice.didBecomeActive(hasNetworkConsent: hasNetworkConsent)
@@ -447,6 +451,7 @@ final class RemoteSessionModel: NSObject, ObservableObject, CrossDeskRTCBridgeDe
 
     func applicationDidEnterBackground() {
         appIsActive = false
+        AppOrientation.suspend()
         appUpdates.setEnabled(false)
         privacyNotice.didEnterBackground()
         suspendVideoForBackground()
@@ -591,6 +596,7 @@ final class RemoteSessionModel: NSObject, ObservableObject, CrossDeskRTCBridgeDe
     }
 
     private func beginRemoteConnection(_ identifier: String) {
+        AppOrientation.endSession()
         networkStatistics = RemoteNetworkStatistics()
         resetRemoteHostInfo()
         cancelVideoRecovery()
@@ -714,7 +720,7 @@ final class RemoteSessionModel: NSObject, ObservableObject, CrossDeskRTCBridgeDe
         selectedDisplay = 0
         connectionStatus = "未连接"
         audioPlayer.endSession()
-        AppOrientation.update(to: .portrait)
+        AppOrientation.endSession()
         appUpdates.checkNow()
     }
 
@@ -1191,7 +1197,7 @@ final class RemoteSessionModel: NSObject, ObservableObject, CrossDeskRTCBridgeDe
             recordSuccessfulConnectionIfNeeded()
             audioPlayer.setEnabled(audioEnabled)
             bridge.setAudioEnabled(audioEnabled)
-            AppOrientation.update(to: .allButUpsideDown)
+            AppOrientation.beginSession(autoLandscape: autoLandscape)
         case 2: connectionStatus = "正在收集 ICE 候选"
         case 3: finishConnection(withError: "网络连接已中断，请重新连接。")
         case 4:

apps/ios/README.md

@@ -203,6 +203,15 @@ the available space. Settings and reading pages are limited to 720 points.
 Resizing preserves the connection fields and active session. iPhone retains its
 portrait home screen and two-column recent-connection grid.
 
+On iPhone, Settings → Screen orientation (屏幕方向) → Landscape after connecting
+(连接后自动横屏) is enabled by default and saved locally. A new session starts in
+landscape and keeps that orientation until the phone is physically held sideways;
+it then resumes the existing device-following policy for the rest of the session.
+Portrait, flat and unknown device poses do not release the initial landscape hold.
+Turning the option off keeps the existing rotation behavior. Leaving the session
+restores portrait; foregrounding the same session does not reapply a released hold.
+iPad orientation and multitasking are unaffected.
+
 ## System keyboard and remote text
 
 The session keyboard button opens the iPhone/iPad's selected system keyboard.