Add shortcut to expand/collapse notification panel

Use Ctrl+n to expand, Ctrl+Shift+n to collapse.

Fixes <https://github.com/Genymobile/scrcpy/issues/392>

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

@@ -12,6 +12,8 @@ public final class ControlEvent {
     public static final int TYPE_COMMAND = 4;
 
     public static final int COMMAND_BACK_OR_SCREEN_ON = 0;
+    public static final int COMMAND_EXPAND_NOTIFICATION_PANEL = 1;
+    public static final int COMMAND_COLLAPSE_NOTIFICATION_PANEL = 2;
 
     private int type;
     private String text;

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

@@ -132,6 +132,14 @@ public final class Device {
         this.rotationListener = rotationListener;
     }
 
+    public void expandNotificationPanel() {
+        serviceManager.getStatusBarManager().expandNotificationsPanel();
+    }
+
+    public void collapsePanels() {
+        serviceManager.getStatusBarManager().collapsePanels();
+    }
+
     static Rect flipRect(Rect crop) {
         return new Rect(crop.top, crop.left, crop.bottom, crop.right);
     }

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

@@ -1,6 +1,7 @@
 package com.genymobile.scrcpy;
 
 import com.genymobile.scrcpy.wrappers.InputManager;
+import com.genymobile.scrcpy.wrappers.ServiceManager;
 
 import android.graphics.Point;
 import android.os.SystemClock;
@@ -172,6 +173,12 @@ public class EventController {
         switch (action) {
             case ControlEvent.COMMAND_BACK_OR_SCREEN_ON:
                 return pressBackOrTurnScreenOn();
+            case ControlEvent.COMMAND_EXPAND_NOTIFICATION_PANEL:
+                device.expandNotificationPanel();
+                return true;
+            case ControlEvent.COMMAND_COLLAPSE_NOTIFICATION_PANEL:
+                device.collapsePanels();
+                return true;
             default:
                 Ln.w("Unsupported command: " + action);
         }

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

@@ -14,6 +14,7 @@ public final class ServiceManager {
     private DisplayManager displayManager;
     private InputManager inputManager;
     private PowerManager powerManager;
+    private StatusBarManager statusBarManager;
 
     public ServiceManager() {
         try {
@@ -60,4 +61,11 @@ public final class ServiceManager {
         }
         return powerManager;
     }
+
+    public StatusBarManager getStatusBarManager() {
+        if (statusBarManager == null) {
+            statusBarManager = new StatusBarManager(getService("statusbar", "com.android.internal.statusbar.IStatusBarService"));
+        }
+        return statusBarManager;
+    }
 }

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

@@ -0,0 +1,41 @@
+package com.genymobile.scrcpy.wrappers;
+
+import android.annotation.SuppressLint;
+import android.os.IInterface;
+import android.view.InputEvent;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public class StatusBarManager {
+
+    private final IInterface manager;
+    private final Method expandNotificationsPanelMethod;
+    private final Method collapsePanelsMethod;
+
+    public StatusBarManager(IInterface manager) {
+        this.manager = manager;
+        try {
+            expandNotificationsPanelMethod = manager.getClass().getMethod("expandNotificationsPanel");
+            collapsePanelsMethod = manager.getClass().getMethod("collapsePanels");
+        } catch (NoSuchMethodException e) {
+            throw new AssertionError(e);
+        }
+    }
+
+    public void expandNotificationsPanel() {
+        try {
+            expandNotificationsPanelMethod.invoke(manager);
+        } catch (InvocationTargetException | IllegalAccessException e) {
+            throw new AssertionError(e);
+        }
+    }
+
+    public void collapsePanels() {
+        try {
+            collapsePanelsMethod.invoke(manager);
+        } catch (InvocationTargetException | IllegalAccessException e) {
+            throw new AssertionError(e);
+        }
+    }
+}