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SystemUIOverlaySistema de gestión de ventanas

SystemUIOverlayWindow Management System proporciona una forma de mostrar y administrar vistas en SystemUIOverlayWindow . Actualmente, esta ventana se usa para vistas que incluyen el conmutador de usuario de pantalla completa, el panel de notificaciones y el bloqueo de teclado. Este artículo no:

  • Cree restricciones sobre lo que el OEM puede agregar a la ventana.
  • Obligarlo a adoptar las abstracciones descritas en este documento.

Visión de conjunto

Puede usar el sistema de administración SystemUIOverlayWindow para mostrar vistas como el aviso legal, el conmutador de usuario de pantalla completa, la cámara de visión trasera, los controles HVAC y el bloqueo de teclado. Esta ventana se encuentra fuera del espacio de la aplicación y le brinda control sobre el orden Z de la vista, los disparadores de revelar/ocultar y las personalizaciones generales, incluida la ubicación, el tamaño, la transparencia y el color de la vista. Al mismo tiempo, no necesita preocuparse por el estado de las barras del sistema u otros objetos de la interfaz de usuario del sistema que deben ocultarse o mostrarse cuando su vista respectiva está oculta o mostrada.

Para aprovechar SystemUIOverlayWindow , cree controladores de vista para sus mediadores de vista. Los mediadores se pasan al controlador de estado global de la ventana. Estos mediadores de vista:

  • Coordinar entre los controladores de vista.
  • Lógica empresarial interna para controladores de vista.

Controladores de vista (coordinados por mediadores de vista):

  • Sea dueño de su vista.
  • Cree configuradores a través de los cuales OverlayViewsMediator pueda adjuntar la lógica empresarial.
  • Cree las animaciones de revelación y ocultación de su vista.

SystemUIOverlayWindow Manager, un componente de SystemUI, sirve como punto de entrada para inicializar y registrar mediadores con el controlador de estado global, mientras que el controlador de estado global se vincula con los controladores de vista de tal manera que los mediadores pueden llamar directamente a los controladores de vista para mostrar y ocultar vistas en la ventana.

OverlayViewController

OverlayViewController es responsable de la vista que se muestra en SystemUIOverlayWindow y controla cómo se revela y se oculta la vista. También permite que se adjunten los oyentes necesarios para que se pueda vincular a la lógica empresarial.

Firmas de métodos importantes

/**
 * Owns a {@link View} that is present in SystemUIOverlayWindow.
 */
public class OverlayViewController {

    /**
     * Shows content of {@link OverlayViewController}.
     *
     * Should be used to show view externally and in particular by {@link OverlayViewMediator}.
     */
    public final void start();

    /**
     * Hides content of {@link OverlayViewController}.
     *
     * Should be used to hide view externally and in particular by {@link OverlayViewMediator}.
     */
    public final void stop();

    /**
     * Inflate layout owned by controller.
     */
    public final void inflate(ViewGroup baseLayout);

    /**
     * Called once inflate finishes.
     */
    protected void onFinishInflate();

    /**
     * Returns {@code true} if layout owned by controller has been inflated.
     */
    public final boolean isInflated();

    /**
     * Subclasses should override this method to implement reveal animations and implement logic
     * specific to when the layout owned by the controller is shown.
     *
     * Should only be overridden by Superclass but not called by any {@link OverlayViewMediator}.
     */
    protected void showInternal();

    /**
     * Subclasses should override this method to implement conceal animations and implement logic
     * specific to when the layout owned by the controller is hidden.
     *
     * Should only be overridden by Superclass but not called by any {@link OverlayViewMediator}.
     */
    protected void hideInternal();

    /**
     * Provides access to layout owned by controller.
     */
    protected final View getLayout();

    /** Returns the {@link OverlayViewGlobalStateController}. */
    protected final OverlayViewGlobalStateController getOverlayViewGlobalStateController();

    /** Returns whether the view controlled by this controller is visible. */
    public final boolean isVisible();

    /**
     * Returns the ID of the focus area that should receive focus when this view is the
     * topmost view or {@link View#NO_ID} if there is no focus area.
     */
    @IdRes
    protected int getFocusAreaViewId();

    /** Returns whether the view controlled by this controller has rotary focus. */
    protected final boolean hasRotaryFocus();

    /**
     * Sets whether this view allows rotary focus. This should be set to {@code true} for the
     * topmost layer in the overlay window and {@code false} for the others.
     */
    public void setAllowRotaryFocus(boolean allowRotaryFocus);

    /**
     * Refreshes the rotary focus in this view if we are in rotary mode. If the view already has
     * rotary focus, it leaves the focus alone. Returns {@code true} if a new view was focused.
     */
    public boolean refreshRotaryFocusIfNeeded();

    /**
     * Returns {@code true} if heads up notifications should be displayed over this view.
     */
    protected boolean shouldShowHUN();

    /**
     * Returns {@code true} if navigation bar insets should be displayed over this view. Has no
     * effect if {@link #shouldFocusWindow} returns {@code false}.
     */
    protected boolean shouldShowNavigationBarInsets();

    /**
     * Returns {@code true} if status bar insets should be displayed over this view. Has no
     * effect if {@link #shouldFocusWindow} returns {@code false}.
     */
    protected boolean shouldShowStatusBarInsets();

    /**
     * Returns {@code true} if this view should be hidden during the occluded state.
     */
    protected boolean shouldShowWhenOccluded();

    /**
     * Returns {@code true} if the window should be focued when this view is visible. Note that
     * returning {@code false} here means that {@link #shouldShowStatusBarInsets} and
     * {@link #shouldShowNavigationBarInsets} will have no effect.
     */
    protected boolean shouldFocusWindow();

    /**
     * Returns {@code true} if the window should use stable insets. Using stable insets means that
     * even when system bars are temporarily not visible, inset from the system bars will still be
     * applied.
     *
     * NOTE: When system bars are hidden in transient mode, insets from them will not be applied
     * even when the system bars become visible. Setting the return value to {@true} here can
     * prevent the OverlayView from overlapping with the system bars when that happens.
     */
    protected boolean shouldUseStableInsets();

    /**
     * Returns the insets types to fit to the sysui overlay window when this
     * {@link OverlayViewController} is in the foreground.
     */
    @WindowInsets.Type.InsetsType
    protected int getInsetTypesToFit();

    /**
     * Optionally returns the sides of enabled system bar insets to fit to the sysui overlay window
     * when this {@link OverlayViewController} is in the foreground.
     *
     * For example, if the bottom and left system bars are enabled and this method returns
     * WindowInsets.Side.LEFT, then the inset from the bottom system bar will be ignored.
     *
     * NOTE: By default, this method returns {@link #INVALID_INSET_SIDE}, so insets to fit are
     * defined by {@link #getInsetTypesToFit()}, and not by this method, unless it is overridden
     * by subclasses.
     *
     * NOTE: {@link #NO_INSET_SIDE} signifies no insets from any system bars will be honored. Each
     * {@link OverlayViewController} can first take this value and add sides of the system bar
     * insets to honor to it.
     *
     * NOTE: If getInsetSidesToFit is overridden to return {@link WindowInsets.Side}, it always
     * takes precedence over {@link #getInsetTypesToFit()}. That is, the return value of {@link
     * #getInsetTypesToFit()} will be ignored.
     */
    @WindowInsets.Side.InsetsSide
    protected int getInsetSidesToFit();
}

OverlayPanelViewController

El controlador OverlayPanelViewController amplía OverlayViewController y proporciona capacidades de animación de arrastre adicionales a su superclase.

OverlayViewMediator

OverlayViewMediator aloja la lógica empresarial que revela u oculta múltiples OverlayViewController (s), por lo tanto, de alguna manera también gestiona la coordinación entre los controladores de vista.

/**
 * Controls when to show and hide {@link OverlayViewController}(s).
 */
public interface OverlayViewMediator {

    /**
     * Register listeners that could use ContentVisibilityAdjuster to show/hide content.
     *
     * Note that we do not unregister listeners because SystemUI components are expected to live
     * for the lifecycle of the device.
     */
    void registerListeners();

    /**
     * Allows for post-inflation callbacks and listeners to be set inside required {@link
     * OverlayViewController}(s).
     */
    void setupOverlayContentViewControllers();
}

SystemUIOverlayWindowManager

SystemUIOverlayWindowManager es responsable de ser el objeto SystemUI que sirve como punto de entrada para que SystemUIOverlayWindow Management System inicialice y registre OverlayViewMediator (s) con OverlayViewGlobalStateController .

Mostrar flujo de vista
Figura 1. SystemUIOverlayWindowManager

OverlayViewGlobalStateController

OverlayViewGlobalStateController recibe llamadas de OverlayViewController (s) para revelarse u ocultarse. Por lo tanto, también contiene el estado de lo que se muestra u oculta en SystemUIOverlayWindow .

El flujo de la vista de espectáculo se ilustra a continuación:

Mostrar flujo de vista
Figura 2. Mostrar flujo de vista

Ocultar flujo de vista

El flujo de vista oculta se ilustra a continuación:

Ocultar flujo de vista
Figura 3. Ocultar flujo de vista

Firmas de métodos públicos

Las firmas de métodos públicos se codifican de la siguiente manera:

​/**
 * This controller is responsible for the following:
 * <p><ul>
 * <li>Holds the global state for SystemUIOverlayWindow.
 * <li>Allows {@link SystemUIOverlayWindowManager} to register {@link OverlayViewMediator}(s).
 * <li>Enables {@link OverlayViewController)(s) to reveal/conceal themselves while respecting the
 * global state of SystemUIOverlayWindow.
 * </ul>
 */
@SysUISingleton
public class OverlayViewGlobalStateController {
    /**
     * Register {@link OverlayViewMediator} to use in SystemUIOverlayWindow.
     */
    public void registerMediator(OverlayViewMediator overlayViewMediator);

    /**
     * Show content in Overlay Window using {@link OverlayPanelViewController}.
     *
     * This calls {@link OverlayViewGlobalStateController#showView(OverlayViewController, Runnable)}
     * where the runnable is nullified since the actual showing of the panel is handled by the
     * controller itself.
     */
    public void showView(OverlayPanelViewController panelViewController);

    /**
     * Show content in Overlay Window using {@link OverlayViewController}.
     */
    public void showView(OverlayViewController viewController, @Nullable Runnable show);

    /**
     * Hide content in Overlay Window using {@link OverlayPanelViewController}.
     *
     * This calls {@link OverlayViewGlobalStateController#hideView(OverlayViewController, Runnable)}
     * where the runnable is nullified since the actual hiding of the panel is handled by the
     * controller itself.
     */
    public void hideView(OverlayPanelViewController panelViewController);

    /**
     * Hide content in Overlay Window using {@link OverlayViewController}.
     */
    public void hideView(OverlayViewController viewController, @Nullable Runnable hide);

    /** Returns {@code true} is the window is visible. */
    public boolean isWindowVisible();

    /**
     * Sets the {@link android.view.WindowManager.LayoutParams#FLAG_ALT_FOCUSABLE_IM} flag of the
     * sysui overlay window.
     */
    public void setWindowNeedsInput(boolean needsInput);

    /** Returns {@code true} if the window is focusable. */
    public boolean isWindowFocusable();

    /** Sets the focusable flag of the sysui overlawy window. */
    public void setWindowFocusable(boolean focusable);

    /** Inflates the view controlled by the given view controller. */
    public void inflateView(OverlayViewController viewController);

    /**
     * Return {@code true} if OverlayWindow is in a state where HUNs should be displayed above it.
     */
    public boolean shouldShowHUN();

    /**
     * Set the OverlayViewWindow to be in occluded or unoccluded state. When OverlayViewWindow is
     * occluded, all views mounted to it that are not configured to be shown during occlusion will
     * be hidden.
     */
    public void setOccluded(boolean occluded);
}

Cómo agregar una vista a SysUIOverlayWindow

Para obtener más información, consulte Codelab .

Paso 1: agregue un ViewStub a SysUIOverlayWindow

Agregue ViewStub al diseño de la ventana .

Paso 2: Crea un OverlayViewController

Use el nuevo ViewStub para crear un nuevo OverlayViewController inyectable.

Paso 3: OverlayViewMediator

Cree un nuevo OverlayViewMediator inyectable o use uno existente (omita el Paso 4) y registre oyentes para ocultar o mostrar el nuevo OverlayViewController .

Paso 4: configurar el nuevo OverlayViewMediator

Agrega tu nuevo OverlayViewMediator a OverlayWindowModule y a config_carSystemUIOverlayViewsMediator .

Advertencias

Tenga en cuenta que una vez que SysUIPrimaryWindow cubre toda la pantalla, los elementos debajo de la ventana no registran eventos táctiles. Por lo tanto, cuando la ventana cubre toda la pantalla pero su contenido deja algo de espacio negativo, puede optar por difuminar el espacio negativo y adjuntar oyentes a ese espacio para descartar el contenido de la ventana.