Restart fullscreen video playback when switching back from background

content/browser/android/content_video_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_ANDROID_CONTENT_VIDEO_VIEW_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIDEO_VIEW_H_
 
 #include <jni.h>
 
 #include "base/android/jni_helper.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer/timer.h"
 
 namespace content {
 
 class BrowserMediaPlayerManager;
+class ContentViewCoreImpl;
 
 // Native mirror of ContentVideoView.java. This class is responsible for
 // creating the Java video view and pass all the player status change to
 // it. It accepts media control from Java class, and forwards it to
 // MediaPlayerManagerImpl.
 class ContentVideoView {
  public:
   // Construct a ContentVideoView object. The |manager| will handle all the
   // playback controls from the Java class.
   ContentVideoView(
       const base::android::ScopedJavaLocalRef<jobject>& context,
       const base::android::ScopedJavaLocalRef<jobject>& client,
       BrowserMediaPlayerManager* manager);
 
+  ContentVideoView(BrowserMediaPlayerManager* manager);
+
   ~ContentVideoView();
 
   // To open another video on existing ContentVideoView.
   void OpenVideo();
 
   static bool RegisterContentVideoView(JNIEnv* env);
   static void KeepScreenOn(bool screen_on);
 
-  // Return true if there is existing ContentVideoView object.
-  static bool HasContentVideoView();
+  // Return the singleton object or NULL.
+  static ContentVideoView* GetInstance();
 
   // Getter method called by the Java class to get the media information.
   int GetVideoWidth(JNIEnv*, jobject obj) const;
   int GetVideoHeight(JNIEnv*, jobject obj) const;
   int GetDurationInMilliSeconds(JNIEnv*, jobject obj) const;
   int GetCurrentPosition(JNIEnv*, jobject obj) const;
   bool IsPlaying(JNIEnv*, jobject obj);
   void UpdateMediaMetadata(JNIEnv*, jobject obj);
 
   // Called when the Java fullscreen view is destroyed. If
   // |release_media_player| is true, |manager_| needs to release the player
   // as we are quitting the app.
   void ExitFullscreen(JNIEnv*, jobject, jboolean release_media_player);
 
+  // Supposed to be called when the application paused or stopped.
+  // Destroys the fullscreen view in a way that it can be recreated
+  // via ResumeFullscreenIfSuspended.
+  void SuspendFullscreen();
+
+  // Supposed to be called when the application switches back to foreground.
+  // Recreates the fullscreen view if it was suspended via SuspendFullscreen.
+  void ResumeFullscreenIfSuspended();
+
   // Media control method called by the Java class.
   void SeekTo(JNIEnv*, jobject obj, jint msec);
   void Play(JNIEnv*, jobject obj);
   void Pause(JNIEnv*, jobject obj);
 
   // Called by the Java class to pass the surface object to the player.
   void SetSurface(JNIEnv*, jobject obj, jobject surface);
 
   // Method called by |manager_| to inform the Java class about player status
   // change.
   void UpdateMediaMetadata();
   void OnMediaPlayerError(int errorType);
   void OnVideoSizeChanged(int width, int height);
   void OnBufferingUpdate(int percent);
   void OnPlaybackComplete();
   void OnExitFullscreen();
 
   // Return the corresponing ContentVideoView Java object if any.
   base::android::ScopedJavaLocalRef<jobject> GetJavaObject(JNIEnv* env);
 
+  // Creates the corresponding ContentVideoView Java object.
+  JavaObjectWeakGlobalRef CreateJavaObject(
+      ContentViewCoreImpl* content_view_core);

[qinmin, 2013/12/18 02:09:46]

no need for the input param, you can get that from manager_ inside this
function.

+
  private:
   // Destroy the |j_content_video_view_|. If |native_view_destroyed| is true,
   // no further calls to the native object is allowed.
   void DestroyContentVideoView(bool native_view_destroyed);
 
   // Object that manages the fullscreen media player. It is responsible for
   // handling all the playback controls.
   BrowserMediaPlayerManager* manager_;
 
   // Weak reference of corresponding Java object.
   JavaObjectWeakGlobalRef j_content_video_view_;
 
+  enum FullscreenState {
+    Entered,
+    Suspend,
+    Resume
+  } fullscreen_state_;
+
   DISALLOW_COPY_AND_ASSIGN(ContentVideoView);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIDEO_VIEW_H_