Merge "Reconciled description of WindowManager with description of Context#createDisplayContext()." am: 92a4b54de5

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1882528

Change-Id: I894941a064dc61c68722036081f0617c47804c83

core/java/android/content/Context.java

@@ -6451,30 +6451,24 @@ public abstract class Context {
             @NonNull Configuration overrideConfiguration);
 
     /**
-     * Return a new Context object for the current Context but whose resources
-     * are adjusted to match the metrics of the given Display.  Each call to this method
-     * returns a new instance of a Context object; Context objects are not
-     * shared, however common state (ClassLoader, other Resources for the
-     * same configuration) may be so the Context itself can be fairly lightweight.
-     *
-     * To obtain an instance of a {@link WindowManager} (see {@link #getSystemService(String)}) that
-     * is configured to show windows on the given display call
-     * {@link #createWindowContext(int, Bundle)} on the returned display Context or use an
-     * {@link android.app.Activity}.
-     *
+     * Returns a new <code>Context</code> object from the current context but with resources
+     * adjusted to match the metrics of <code>display</code>. Each call to this method
+     * returns a new instance of a context object. Context objects are not shared; however,
+     * common state (such as the {@link ClassLoader} and other resources for the same
+     * configuration) can be shared, so the <code>Context</code> itself is lightweight.
      * <p>
-     * Note that invoking #createDisplayContext(Display) from an UI context is not regarded
-     * as an UI context. In other words, it is not suggested to access UI components (such as
-     * obtain a {@link WindowManager} by {@link #getSystemService(String)})
-     * from the context created from #createDisplayContext(Display).
-     * </p>
+     * To obtain an instance of {@link WindowManager} configured to show windows on the given
+     * display, call {@link #createWindowContext(int, Bundle)} on the returned display context,
+     * then call {@link #getSystemService(String)} or {@link #getSystemService(Class)} on the
+     * returned window context.
+     * <p>
+     * <b>Note:</b> The context returned by <code>createDisplayContext(Display)</code> is not a UI
+     * context. Do not access UI components or obtain a {@link WindowManager} from the context
+     * created by <code>createDisplayContext(Display)</code>.
      *
-     * @param display A {@link Display} object specifying the display for whose metrics the
-     * Context's resources should be tailored.
+     * @param display The display to which the current context's resources are adjusted.
      *
-     * @return A {@link Context} for the display.
-     *
-     * @see #getSystemService(String)
+     * @return A context for the display.
      */
     @DisplayContext
     public abstract Context createDisplayContext(@NonNull Display display);

core/java/android/view/WindowManager.java

@@ -127,17 +127,15 @@ import java.util.function.Consumer;
 
 /**
  * The interface that apps use to talk to the window manager.
- * </p><p>
- * Each window manager instance is bound to a particular {@link Display}.
- * To obtain a {@link WindowManager} for a different display, use
- * {@link Context#createDisplayContext} to obtain a {@link Context} for that
- * display, then use <code>Context.getSystemService(Context.WINDOW_SERVICE)</code>
- * to get the WindowManager.
- * </p><p>
- * The simplest way to show a window on another display is to create a
- * {@link Presentation}.  The presentation will automatically obtain a
- * {@link WindowManager} and {@link Context} for that display.
- * </p>
+ * <p>
+ * Each window manager instance is bound to a {@link Display}. To obtain the
+ * <code>WindowManager</code> associated with a display,
+ * call {@link Context#createWindowContext(Display, int, Bundle)} to get the display's UI context,
+ * then call {@link Context#getSystemService(String)} or {@link Context#getSystemService(Class)} on
+ * the UI context.
+ * <p>
+ * The simplest way to show a window on a particular display is to create a {@link Presentation},
+ * which automatically obtains a <code>WindowManager</code> and context for the display.
  */
 @SystemService(Context.WINDOW_SERVICE)
 public interface WindowManager extends ViewManager {