Synchronize device clipboard to computer

Automatically synchronize the device clipboard to the computer any time
it changes.

This allows seamless copy-paste from Android to the computer.

Fixes #1056 <https://github.com/Genymobile/scrcpy/issues/1056#issuecomment-631363684>

README.md

@@ -482,6 +482,9 @@ both directions:
  - `Ctrl`+`v` _pastes_ the computer clipboard as a sequence of text events (but
    breaks non-ASCII characters).
 
+Moreover, any time the Android clipboard changes, it is automatically
+synchronized to the computer clipboard.
+
 #### Text injection preference
 
 There are two kinds of [events][textevents] generated when typing text:

server/src/main/aidl/android/content/IOnPrimaryClipChangedListener.aidl

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.content;
+
+/**
+ * {@hide}
+ */
+oneway interface IOnPrimaryClipChangedListener {
+    void dispatchPrimaryClipChanged();
+}

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

@@ -6,10 +6,10 @@ import com.genymobile.scrcpy.wrappers.ServiceManager;
 import com.genymobile.scrcpy.wrappers.SurfaceControl;
 import com.genymobile.scrcpy.wrappers.WindowManager;
 
+import android.content.IOnPrimaryClipChangedListener;
 import android.graphics.Rect;
 import android.os.Build;
 import android.os.IBinder;
-import android.os.RemoteException;
 import android.view.IRotationWatcher;
 import android.view.InputEvent;
 
@@ -22,10 +22,15 @@ public final class Device {
         void onRotationChanged(int rotation);
     }
 
+    public interface ClipboardListener {
+        void onClipboardTextChanged(String text);
+    }
+
     private final ServiceManager serviceManager = new ServiceManager();
 
     private ScreenInfo screenInfo;
     private RotationListener rotationListener;
+    private ClipboardListener clipboardListener;
 
     /**
      * Logical display identifier
@@ -66,6 +71,23 @@ public final class Device {
             }
         }, displayId);
 
+        if (options.getControl()) {
+            // If control is enabled, synchronize Android clipboard to the computer automatically
+            serviceManager.getClipboardManager().addPrimaryClipChangedListener(new IOnPrimaryClipChangedListener.Stub() {
+                @Override
+                public void dispatchPrimaryClipChanged() {
+                    synchronized (Device.this) {
+                        if (clipboardListener != null) {
+                            String text = getClipboardText();
+                            if (text != null) {
+                                clipboardListener.onClipboardTextChanged(text);
+                            }
+                        }
+                    }
+                }
+            });
+        }
+
         if ((displayInfoFlags & DisplayInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS) == 0) {
             Ln.w("Display doesn't have FLAG_SUPPORTS_PROTECTED_BUFFERS flag, mirroring can be restricted");
         }
@@ -138,6 +160,10 @@ public final class Device {
         this.rotationListener = rotationListener;
     }
 
+    public synchronized void setClipboardListener(ClipboardListener clipboardListener) {
+        this.clipboardListener = clipboardListener;
+    }
+
     public void expandNotificationPanel() {
         serviceManager.getStatusBarManager().expandNotificationsPanel();
     }

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

@@ -53,11 +53,18 @@ public final class Server {
             ScreenEncoder screenEncoder = new ScreenEncoder(options.getSendFrameMeta(), options.getBitRate(), options.getMaxFps());
 
             if (options.getControl()) {
-                Controller controller = new Controller(device, connection);
+                final Controller controller = new Controller(device, connection);
 
                 // asynchronous
                 startController(controller);
                 startDeviceMessageSender(controller.getSender());
+
+                device.setClipboardListener(new Device.ClipboardListener() {
+                    @Override
+                    public void onClipboardTextChanged(String text) {
+                        controller.getSender().pushClipboardText(text);
+                    }
+                });
             }
 
             try {

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

@@ -3,6 +3,7 @@ package com.genymobile.scrcpy.wrappers;
 import com.genymobile.scrcpy.Ln;
 
 import android.content.ClipData;
+import android.content.IOnPrimaryClipChangedListener;
 import android.os.Build;
 import android.os.IInterface;
 
@@ -13,6 +14,7 @@ public class ClipboardManager {
     private final IInterface manager;
     private Method getPrimaryClipMethod;
     private Method setPrimaryClipMethod;
+    private Method addPrimaryClipChangedListener;
 
     public ClipboardManager(IInterface manager) {
         this.manager = manager;
@@ -81,4 +83,37 @@ public class ClipboardManager {
             return false;
         }
     }
+
+    private static void addPrimaryClipChangedListener(Method method, IInterface manager, IOnPrimaryClipChangedListener listener)
+            throws InvocationTargetException, IllegalAccessException {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+            method.invoke(manager, listener, ServiceManager.PACKAGE_NAME);
+        } else {
+            method.invoke(manager, listener, ServiceManager.PACKAGE_NAME, ServiceManager.USER_ID);
+        }
+    }
+
+    private Method getAddPrimaryClipChangedListener() throws NoSuchMethodException {
+        if (addPrimaryClipChangedListener == null) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+                addPrimaryClipChangedListener = manager.getClass()
+                        .getMethod("addPrimaryClipChangedListener", IOnPrimaryClipChangedListener.class, String.class);
+            } else {
+                addPrimaryClipChangedListener = manager.getClass()
+                        .getMethod("addPrimaryClipChangedListener", IOnPrimaryClipChangedListener.class, String.class, int.class);
+            }
+        }
+        return addPrimaryClipChangedListener;
+    }
+
+    public boolean addPrimaryClipChangedListener(IOnPrimaryClipChangedListener listener) {
+        try {
+            Method method = getAddPrimaryClipChangedListener();
+            addPrimaryClipChangedListener(method, manager, listener);
+            return true;
+        } catch (InvocationTargetException | IllegalAccessException | NoSuchMethodException e) {
+            Ln.e("Could not invoke method", e);
+            return false;
+        }
+    }
 }