WindowManager系列（五）Window接口及其子类

最新推荐文章于 2023-02-04 19:15:22 发布

perfectnihil

最新推荐文章于 2023-02-04 19:15:22 发布

阅读量421

点赞数

CC 4.0 BY-SA版权

分类专栏：安卓

本文链接：https://blog.youkuaiyun.com/perfectnihil/article/details/90776620

安卓专栏收录该内容

219 篇文章

订阅专栏

本文深入探讨了Android系统中Window类与PhoneWindow类的作用与实现。Window作为顶级窗口外观和行为策略的基础类，其核心实现由PhoneWindow提供，后者负责具体UI策略，如背景、标题区域及默认按键处理等。PhoneWindow的构造方法详细展示了如何为活动创建主窗口，包括上下文使用、装饰视图初始化及图片内嵌模式支持。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

看下源码注释

Window:

/**
* Abstract base class for a top-level window look and behavior policy. An
* instance of this class should be used as the top-level view added to the
* window manager. It provides standard UI policies such as a background, title
* area, default key processing, etc.
*
* <p>The only existing implementation of this abstract class is
* android.view.PhoneWindow, which you should instantiate when needing a
* Window.
*/

翻译：这个类定义了 window的look和behavior policy,这个类的唯一实现类是phoneWindow

这个类两千多行。。。

phoneWindow

看下phoneWindow,三千七百多行。。。

/**
* Android-specific Window.
* <p>
* todo: need to pull the generic functionality out into a base class
* in android.widget.
*
* @hide
*/

Android-specific Window

看下phoneWindow的构造

   /**
     * Constructor for main window of an activity.
     */
    public PhoneWindow(Context context, Window preservedWindow,
            ActivityConfigCallback activityConfigCallback) {
        this(context);
        // Only main activity windows use decor context, all the other windows depend on whatever
        // context that was given to them.
        mUseDecorContext = true;
        if (preservedWindow != null) {
            mDecor = (DecorView) preservedWindow.getDecorView();
            mElevation = preservedWindow.getElevation();
            mLoadElevation = false;
            mForceDecorInstall = true;
            // If we're preserving window, carry over the app token from the preserved
            // window, as we'll be skipping the addView in handleResumeActivity(), and
            // the token will not be updated as for a new window.
            getAttributes().token = preservedWindow.getAttributes().token;
        }
        // Even though the device doesn't support picture-in-picture mode,
        // an user can force using it through developer options.
        boolean forceResizable = Settings.Global.getInt(context.getContentResolver(),
                DEVELOPMENT_FORCE_RESIZABLE_ACTIVITIES, 0) != 0;
        mSupportsPictureInPicture = forceResizable || context.getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_PICTURE_IN_PICTURE);
        mActivityConfigCallback = activityConfigCallback;
    }