PIP: Send KEYCODE_WINDOW to app first if PIP isn't exist

Bug: 27954955
Change-Id: I517e378d5c1672ac0eb87bdf4375b7d733276e58

core/java/android/view/View.java

@@ -3068,6 +3068,13 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      */
     public static final int RECENT_APPS_VISIBLE = 0x00004000;
 
+    /**
+     * @hide
+     *
+     * Whether the TV's picture-in-picture is visible or not.
+     */
+    public static final int TV_PICTURE_IN_PICTURE_VISIBLE = 0x00010000;
+
     /**
      * @hide
      *

core/java/android/view/Window.java

@@ -24,6 +24,7 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.StyleRes;
 import android.annotation.SystemApi;
+import android.app.ActivityManagerNative;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.content.res.Resources;
@@ -1255,6 +1256,18 @@ public abstract class Window {
         return getDecorView().findViewById(id);
     }
 
+    /**
+     * Puts the activity in picture-in-picture mode.
+     * @see android.R.attr#supportsPictureInPicture
+     * @hide
+     */
+    protected void enterPictureInPictureMode() {
+        try {
+            ActivityManagerNative.getDefault().enterPictureInPictureMode(mAppToken);
+        } catch (IllegalArgumentException|RemoteException e) {
+        }
+    }
+
     /**
      * Convenience for
      * {@link #setContentView(View, android.view.ViewGroup.LayoutParams)}

core/java/com/android/internal/policy/PhoneWindow.java

@@ -2002,6 +2002,13 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
                 }
                 return true;
             }
+
+            case KeyEvent.KEYCODE_WINDOW: {
+                if (!event.isCanceled()) {
+                    enterPictureInPictureMode();
+                }
+                return true;
+            }
         }
 
         return false;

core/java/com/android/internal/statusbar/IStatusBar.aidl

@@ -105,14 +105,9 @@ oneway interface IStatusBar
     void onCameraLaunchGestureDetected(int source);
 
     /**
-     * Request picture-in-picture.
-     *
-     * <p>
-     * This is called when an user presses picture-in-picture key or equivalent.
-     * TV device may start picture-in-picture from foreground activity if there's none.
-     * Picture-in-picture overlay menu will be shown instead otherwise.
+     * Shows the TV's picture-in-picture menu if an activity is in picture-in-picture mode.
      */
-    void requestTvPictureInPicture();
+    void showTvPictureInPictureMenu();
 
     void addQsTile(in ComponentName tile);
     void remQsTile(in ComponentName tile);