refactor

shell/platform/android/io/flutter/embedding/engine/systemchannels/PlatformViewsChannel.java

@@ -147,15 +147,18 @@ private void resize(@NonNull MethodCall call, @NonNull MethodChannel.Result resu
                   (double) resizeArgs.get("width"),
                   (double) resizeArgs.get("height"));
           try {
-            final PlatformViewBufferSize sz = handler.resize(resizeRequest);
-            if (sz == null) {
-              result.error("error", "Failed to resize the platform view", null);
-            } else {
-              final Map<String, Object> response = new HashMap<>();
-              response.put("width", (double) sz.width);
-              response.put("height", (double) sz.height);
-              result.success(response);
-            }
+            handler.resize(
+                resizeRequest,
+                (PlatformViewBufferSize bufferSize) -> {
+                  if (bufferSize == null) {
+                    result.error("error", "Failed to resize the platform view", null);
+                  } else {
+                    final Map<String, Object> response = new HashMap<>();
+                    response.put("width", (double) bufferSize.width);
+                    response.put("height", (double) bufferSize.height);
+                    result.success(response);
+                  }
+                });
           } catch (IllegalStateException exception) {
             result.error("error", detailedExceptionString(exception), null);
           }
@@ -298,9 +301,11 @@ public interface PlatformViewsHandler {
      * The Flutter application would like to resize an existing Android {@code View}.
      *
      * @param request The request to resize the platform view.
-     * @return The buffer size where the platform view pixels are written to.
+     * @param onComplete Once the resize is completed, this is the handler to notify the size of the
+     *     platform view buffer.
      */
-    PlatformViewBufferSize resize(@NonNull PlatformViewResizeRequest request);
+    void resize(
+        @NonNull PlatformViewResizeRequest request, @NonNull PlatformViewBufferResized onComplete);
 
     /**
      * The Flutter application would like to change the offset of an existing Android {@code View}.
@@ -418,6 +423,11 @@ public PlatformViewBufferSize(int width, int height) {
     }
   }
 
+  /** Allows to notify when a platform view buffer has been resized. */
+  public interface PlatformViewBufferResized {
+    void run(@Nullable PlatformViewBufferSize bufferSize);
+  }
+
   /** The state of a touch event in Flutter within a platform view. */
   public static class PlatformViewTouch {
     /** The ID of the platform view as seen by the Flutter side. */

shell/platform/android/io/flutter/plugin/editing/TextInputPlugin.java

@@ -54,6 +54,12 @@ public class TextInputPlugin implements ListenableEditingState.EditingStateWatch
   // Initialize the "last seen" text editing values to a non-null value.
   private TextEditState mLastKnownFrameworkTextEditingState;
 
+  // When true following calls to createInputConnection will return the cached lastInputConnection
+  // if the input
+  // target is a platform view. See the comments on lockPlatformViewInputConnection for more
+  // details.
+  private boolean isInputConnectionLocked;
+
   @SuppressLint("NewApi")
   public TextInputPlugin(
       @NonNull View view,
@@ -176,6 +182,34 @@ ImeSyncDeferringInsetsCallback getImeSyncCallback() {
     return imeSyncCallback;
   }
 
+  /**
+   * Use the current platform view input connection until unlockPlatformViewInputConnection is
+   * called.
+   *
+   * <p>The current input connection instance is cached and any following call to @{link
+   * createInputConnection} returns the cached connection until unlockPlatformViewInputConnection is
+   * called.
+   *
+   * <p>This is a no-op if the current input target isn't a platform view.
+   *
+   * <p>This is used to preserve an input connection when moving a platform view from one virtual
+   * display to another.
+   */
+  public void lockPlatformViewInputConnection() {
+    if (inputTarget.type == InputTarget.Type.PLATFORM_VIEW) {
+      isInputConnectionLocked = true;
+    }
+  }
+
+  /**
+   * Unlocks the input connection.
+   *
+   * <p>See also: @{link lockPlatformViewInputConnection}.
+   */
+  public void unlockPlatformViewInputConnection() {
+    isInputConnectionLocked = false;
+  }
+
   /**
    * Detaches the text input plugin from the platform views controller.
    *

shell/platform/android/io/flutter/plugin/platform/PlatformView.java

@@ -66,22 +66,16 @@ default void onFlutterViewDetached() {}
    *
    * <p>This hook only exists for rare cases where the plugin relies on the state of the input
    * connection. This probably doesn't need to be implemented.
-   *
-   * <p>This method is deprecated, and will be removed in a future release.
    */
   @SuppressLint("NewApi")
-  @Deprecated
   default void onInputConnectionLocked() {}
 
   /**
    * Callback fired when the platform input connection has been unlocked.
    *
    * <p>This hook only exists for rare cases where the plugin relies on the state of the input
    * connection. This probably doesn't need to be implemented.
-   *
-   * <p>This method is deprecated, and will be removed in a future release.
    */
   @SuppressLint("NewApi")
-  @Deprecated
   default void onInputConnectionUnlocked() {}
 }