Three methods are defined in ViewManager, which are used to add, update and delete Views:įrameworks/base/core/java/android/view/ViewManager. WindowManager is an interface class that inherits from the interface ViewManager. Next, we analyze the WindowManager system and the relationship between Window and WindowManager from the perspective of source code. WindowManager is used to manage Window, and the functions provided by WindowManager will eventually be handled by WMS. Window is represented by dotted lines because Window is an abstract concept, not real, and the entity of Window is actually View. The relationship between Window, WindowManager and WMS can be briefly represented by the following figure.

The focus of this series of articles is WindowManager. Here we only need to know that its main functions include Window management and input system. The functions of WMS will be introduced in subsequent articles. Yes, this is somewhat similar to the relationship between ActivityManager and AMS. As a system service, WMS has many APIs that are not exposed to WindowManager. WindowManager and WMS communicate across processes through Binder. If we want to add and delete Window, we can use WindowManager. Its implementation class is WindowManagerImpl. It is known from the name that it is used to manage Window. It is an abstract class, and the concrete implementation class is PhoneWindow, which manages the View. In this article, we To learn the WindowManager system. I didnt need to use fragments or activities. Then create a regular java class that can be used as the event listeners for the actions within that layout. windowManager.addView(view, view.getViewParams()) view.getWindowToken()null. Why to better understand WMS, we must first understand WindowManager. 1 Answer Sorted by: 6 Ok the correct approach to this appears to be to inflate the layout with in the service class and add it to the windowmanager that way. Similarly, WMS is also very complex and requires multiple articles to explain. WindowManagerService (WMS), like AMS, is a knowledge point that Android development needs to master. frameworks/base/core/java/android/view/WindowManagerImpl.java public void addView(View view, ViewGroup.LayoutParams params) else if (displa圜 in-depth four components foreword

Android java windowmanager addview