[Android] Support third part media player on Crosswalk

A requirement from an important customer who want to forward web resources with proxy
on Crosswalk, but android system MediaPlayer can't set a proxy with a standard API.
The ExoMediaPlayer is playing videos and music is a popular activity on Android devices,
and it can be configured with proxy.
https://developer.android.com/guide/topics/media/exoplayer.html

BUG=XWALK-6770

runtime/android/core_internal/src/org/xwalk/core/internal/XWalkContent.java

@@ -132,7 +132,7 @@ public XWalkContent(Context context, String animatable, XWalkViewInternal xwView
         mGeolocationPermissions = new XWalkGeolocationPermissions(sharedPreferences);
 
         MediaPlayerBridge.setResourceLoadingFilter(
-                new XWalkMediaPlayerResourceLoadingFilter());
+                new XWalkMediaPlayerResourceLoadingFilter(mContentsClientBridge));
 
         setNativeContent(nativeInit(), animatable);
 
@@ -379,6 +379,11 @@ public void setXWalkWebChromeClient(XWalkWebChromeClient client) {
         mContentsClientBridge.setXWalkWebChromeClient(client);
     }
 
+    public void setXWalkMediaPlayer(XWalkMediaPlayerInternal mediaPlayer) {
+        if (mNativeContent == 0) return;
+        mContentsClientBridge.setXWalkMediaPlayer(mediaPlayer);
+    }
+
     public XWalkWebChromeClient getXWalkWebChromeClient() {
         if (mNativeContent == 0) return null;
         return mContentsClientBridge.getXWalkWebChromeClient();

runtime/android/core_internal/src/org/xwalk/core/internal/XWalkContentsClientBridge.java

@@ -70,6 +70,7 @@ class XWalkContentsClientBridge extends XWalkContentsClient
     private XWalkNavigationHandler mNavigationHandler;
     private XWalkNotificationService mNotificationService;
     private Handler mUiThreadHandler;
+    private XWalkMediaPlayerInternal mXWalkMediaPlayerInternal;
 
     /** State recording variables */
     // For fullscreen state.
@@ -163,6 +164,13 @@ public void setResourceClient(XWalkResourceClientInternal client) {
         mXWalkResourceClient = new XWalkResourceClientInternal(mXWalkView);
     }
 
+    public void setXWalkMediaPlayer(XWalkMediaPlayerInternal mediaPlayer) {
+        mXWalkMediaPlayerInternal = mediaPlayer;
+    }
+
+    public XWalkMediaPlayerInternal getExternalMediaPlayer() {
+        return mXWalkMediaPlayerInternal;
+    }
 
     public void setXWalkWebChromeClient(XWalkWebChromeClient client) {
         // If it's null, use Crosswalk implementation.

runtime/android/core_internal/src/org/xwalk/core/internal/XWalkMediaPlayerInternal.java

@@ -0,0 +1,253 @@
+// Copyright (c) 2016 Intel Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.xwalk.core.internal;
+
+import android.content.Context;
+import android.media.MediaPlayer.OnBufferingUpdateListener;
+import android.media.MediaPlayer.OnCompletionListener;
+import android.media.MediaPlayer.OnErrorListener;
+import android.media.MediaPlayer.OnPreparedListener;
+import android.media.MediaPlayer.OnSeekCompleteListener;
+import android.media.MediaPlayer.OnVideoSizeChangedListener;
+import android.media.MediaPlayer.TrackInfo;
+import android.net.Uri;
+import android.util.Log;
+import android.view.Surface;
+
+import java.io.FileDescriptor;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.chromium.media.ExternalMediaPlayer;
+
+@XWalkAPI(createExternally = true)
+public class XWalkMediaPlayerInternal extends ExternalMediaPlayer {
+    private final static String TAG = "XWalkMediaPlayerInternal";
+
+    private void unsupported() {
+        Log.e(TAG, "ERROR: The function must be implemented");
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * Sets the Surface to be used as the sink for the video portion of the media.
+     * @param surface the Surface to be used for the video portion of the media.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setSurface(Surface surface) {
+        unsupported();
+    }
+
+    /**
+     * Sets the data source as a content Uri.
+     * @param context the Context to use when resolving the Uri.
+     * @param uri the Content URI of the data you want to play.
+     * @param headers the headers to be sent together with the request for the data.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setDataSource(Context context, Uri uri, Map<String, String> headers) {
+        unsupported();
+    }
+
+    /**
+     * Sets the data source (FileDescriptor) to use.
+     * @param offset the offset into the file where the data to be played starts, in bytes.
+     * @param length the length in bytes of the data to be played.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setDataSource(FileDescriptor fd, long offset, long length) {
+        unsupported();
+    }
+
+    /**
+     * Sets the data source as a content Uri.
+     * @param context the Context to use when resolving the Uri.
+     * @param uri the Content URI of the data you want to play.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setDataSource(Context context, Uri uri) {
+        unsupported();
+    }
+
+    /**
+     * Prepares the player for playback, asynchronously.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void prepareAsync() {
+        unsupported();
+    }
+
+    /**
+     * Checks whether the MediaPlayer is playing.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public boolean isPlaying() {
+        unsupported();
+        return false;
+    }
+
+    /**
+     * Returns the width of the video.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public int getVideoWidth() {
+        unsupported();
+        return 0;
+    }
+
+    /**
+     * Returns the height of the video.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public int getVideoHeight() {
+        unsupported();
+        return 0;
+    }
+
+    /**
+     * Gets the current playback position.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public int getCurrentPosition() {
+        unsupported();
+        return 0;
+    }
+
+    /**
+     * Gets the duration of the file.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public int getDuration() {
+        unsupported();
+        return 0;
+    }
+
+    /**
+     * Releases resources associated with this MediaPlayer object.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void release() {
+        unsupported();
+    }
+
+    /**
+     * Sets the volume on this player.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setVolume(float volume1, float volume2) {
+        unsupported();
+    }
+
+    /**
+     * Starts or resumes playback. If playback had previously been paused,
+     * playback will continue from where it was paused. If playback had been stopped,
+     * or never started before, playback will start at the beginning.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void start() {
+        unsupported();
+    }
+
+    /**
+     * Pauses playback. Call start() to resume.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void pause() {
+        unsupported();
+    }
+
+    /**
+     * Seeks to specified time position.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void seekTo(int msec) {
+        unsupported();
+    }
+
+    /**
+     * Returns an array of track information.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public TrackInfo[] getTrackInfo() {
+        unsupported();
+        return null;
+    }
+
+    /**
+     * Register a callback to be invoked when the status of a network stream's buffer has changed.
+     * @param listener the callback that will be run.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setOnBufferingUpdateListener(OnBufferingUpdateListener listener) {
+        unsupported();
+    }
+
+    /**
+     * Register a callback to be invoked when the end of a media source has been reached during playback.
+     * @param listener the callback that will be run.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setOnCompletionListener(OnCompletionListener listener) {
+        unsupported();
+    }
+
+    /**
+     * Register a callback to be invoked when an error has happened during an asynchronous operation.
+     * @param listener the callback that will be run.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setOnErrorListener(OnErrorListener listener) {
+        unsupported();
+    }
+
+    /**
+     * Register a callback to be invoked when the media source is ready for playback.
+     * @param listener the callback that will be run.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setOnPreparedListener(OnPreparedListener listener) {
+        unsupported();
+    }
+
+    /**
+     * Register a callback to be invoked when a seek operation has been completed.
+     * @param listener the callback that will be run.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setOnSeekCompleteListener(OnSeekCompleteListener listener) {
+        unsupported();
+    }
+
+    /**
+     * Register a callback to be invoked when the video size is known or updated.
+     * @param listener the callback that will be run.
+     * @since 7.0
+     */
+    @XWalkAPI
+    public void setOnVideoSizeChangedListener(OnVideoSizeChangedListener listener) {
+        unsupported();
+    }
+}

runtime/android/core_internal/src/org/xwalk/core/internal/XWalkMediaPlayerResourceLoadingFilter.java

@@ -6,9 +6,9 @@
 
 import android.content.Context;
 import android.content.res.AssetFileDescriptor;
-import android.media.MediaPlayer;
 import android.net.Uri;
 
+import org.chromium.media.ExternalMediaPlayer;
 import org.chromium.media.MediaPlayerBridge;
 
 import java.io.File;
@@ -22,8 +22,14 @@
 
 class XWalkMediaPlayerResourceLoadingFilter extends
         MediaPlayerBridge.ResourceLoadingFilter {
+    private XWalkContentsClientBridge mContentsClientBridge;
+
+    XWalkMediaPlayerResourceLoadingFilter(XWalkContentsClientBridge clientBridge) {
+        mContentsClientBridge = clientBridge;
+    }
+
     @Override
-    public boolean shouldOverrideResourceLoading(MediaPlayer mediaPlayer,
+    public boolean shouldOverrideResourceLoading(ExternalMediaPlayer mediaPlayer,
             Context context, Uri uri) {
         String scheme = uri.getScheme();
         if (scheme == null) return false;
@@ -39,10 +45,20 @@ public boolean shouldOverrideResourceLoading(MediaPlayer mediaPlayer,
                     context.getAssets().openFd(AndroidProtocolHandler.getAssetPath(uri));
             mediaPlayer.setDataSource(
                     afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
-
             return true;
         } catch (Exception e) {
             return false;
         }
     }
+
+    @Override
+    public ExternalMediaPlayer getExternalMediaPlayer() {
+        ExternalMediaPlayer exMediaPlayer = mContentsClientBridge.getExternalMediaPlayer();
+
+        if (exMediaPlayer == null) {
+            exMediaPlayer = new ExternalMediaPlayer();
+        }
+
+        return exMediaPlayer;
+    }
 }

runtime/android/core_internal/src/org/xwalk/core/internal/XWalkViewInternal.java

@@ -954,6 +954,19 @@ public void setResourceClient(XWalkResourceClientInternal client) {
         mContent.setResourceClient(client);
     }
 
+    /**
+     * Support third party MediaPlayer in Crosswalk with implementing the api
+     * from XWalkMediaPlayerInternal.
+     * @param mediaPlayer the XWalkMediaPlayerInternal implemented by customers.
+     * @since 7.0
+     */
+    @XWalkAPI(reservable = true)
+    public void setXWalkMediaPlayer(XWalkMediaPlayerInternal mediaPlayer) {
+        if (mContent == null) return;
+        checkThreadSafety();
+        mContent.setXWalkMediaPlayer(mediaPlayer);
+    }
+
     /**
      * Set Background color of the view
      */

tools/reflection_generator/reflection_generator.py

@@ -50,6 +50,7 @@
     'XWalkWebResourceRequestHandlerInternal',
     'XWalkWebResourceRequestInternal',
     'XWalkWebResourceResponseInternal',
+    'XWalkMediaPlayerInternal',
 ]
 
 REFLECTION_HERLPER = [