Register DisplayFoldListener only for Android 10+

This listener does not exist on Android < 10, and it makes scrcpy fail.

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -99,25 +99,27 @@ public final class Device {
             }
         }, displayId);
 
-        ServiceManager.getWindowManager().registerDisplayFoldListener(new IDisplayFoldListener.Stub() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-            @Override
+            ServiceManager.getWindowManager().registerDisplayFoldListener(new IDisplayFoldListener.Stub() {
-            public void onDisplayFoldChanged(int displayId, boolean folded) {
+                @Override
-                synchronized (Device.this) {
+                public void onDisplayFoldChanged(int displayId, boolean folded) {
-                    DisplayInfo displayInfo = ServiceManager.getDisplayManager().getDisplayInfo(displayId);
+                    synchronized (Device.this) {
-                    if (displayInfo == null) {
+                        DisplayInfo displayInfo = ServiceManager.getDisplayManager().getDisplayInfo(displayId);
-                        Ln.e("Display " + displayId + " not found\n" + LogUtils.buildDisplayListMessage());
+                        if (displayInfo == null) {
-                        return;
+                            Ln.e("Display " + displayId + " not found\n" + LogUtils.buildDisplayListMessage());
-                    }
+                            return;
+                        }
 
-                    screenInfo = ScreenInfo.computeScreenInfo(displayInfo.getRotation(), displayInfo.getSize(), options.getCrop(),
+                        screenInfo = ScreenInfo.computeScreenInfo(displayInfo.getRotation(), displayInfo.getSize(), options.getCrop(),
-                            options.getMaxSize(), options.getLockVideoOrientation());
+                                options.getMaxSize(), options.getLockVideoOrientation());
-                    // notify
+                        // notify
-                    if (foldListener != null) {
+                        if (foldListener != null) {
-                        foldListener.onFoldChanged(displayId, folded);
+                            foldListener.onFoldChanged(displayId, folded);
+                        }
                     }
                 }
-            }
+            });
-        });
+        }
 
         if (options.getControl() && options.getClipboardAutosync()) {
             // If control and autosync are enabled, synchronize Android clipboard to the computer automatically

server/src/main/java/com/genymobile/scrcpy/wrappers/WindowManager.java

@@ -2,6 +2,7 @@ package com.genymobile.scrcpy.wrappers;
 
 import com.genymobile.scrcpy.Ln;
 
+import android.annotation.TargetApi;
 import android.os.IInterface;
 import android.view.IRotationWatcher;
 import android.view.IDisplayFoldListener;
@@ -110,6 +111,7 @@ public final class WindowManager {
         }
     }
 
+    @TargetApi(29)
     public void registerDisplayFoldListener(IDisplayFoldListener foldListener) {
         try {
             Class<?> cls = manager.getClass();