src/com/owncloud/android/ui/preview/PreviewMediaFragment.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2013 ownCloud Inc.
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17 package com.owncloud.android.ui.preview;
  18
  19 import java.util.ArrayList;
  20 import java.util.List;
  21
  22 import android.accounts.Account;
  23 import android.app.Activity;
  24 import android.app.AlertDialog;
  25 import android.content.ComponentName;
  26 import android.content.Context;
  27 import android.content.DialogInterface;
  28 import android.content.Intent;
  29 import android.content.ServiceConnection;
  30 import android.content.res.Configuration;
  31 import android.media.MediaPlayer;
  32 import android.media.MediaPlayer.OnCompletionListener;
  33 import android.media.MediaPlayer.OnErrorListener;
  34 import android.media.MediaPlayer.OnPreparedListener;
  35 import android.os.Build;
  36 import android.os.Bundle;
  37 import android.os.IBinder;
  38 import android.view.LayoutInflater;
  39 import android.view.MotionEvent;
  40 import android.view.View;
  41 import android.view.View.OnTouchListener;
  42 import android.view.ViewGroup;
  43 import android.widget.ImageView;
  44 import android.widget.Toast;
  45 import android.widget.VideoView;
  46
  47 import com.actionbarsherlock.view.Menu;
  48 import com.actionbarsherlock.view.MenuInflater;
  49 import com.actionbarsherlock.view.MenuItem;
  50 import com.owncloud.android.R;
  51 import com.owncloud.android.datamodel.FileDataStorageManager;
  52 import com.owncloud.android.datamodel.OCFile;
  53 import com.owncloud.android.media.MediaControlView;
  54 import com.owncloud.android.media.MediaService;
  55 import com.owncloud.android.media.MediaServiceBinder;
  56 import com.owncloud.android.ui.activity.FileActivity;
  57 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
  58 import com.owncloud.android.ui.fragment.FileFragment;
  59 import com.owncloud.android.utils.Log_OC;
  60
  61
  62 /**
  63  * This fragment shows a preview of a downloaded media file (audio or video).
  64  *
  65  * Trying to get an instance with NULL {@link OCFile} or ownCloud {@link Account} values will produce an {@link IllegalStateException}.
  66  *
  67  * By now, if the {@link OCFile} passed is not downloaded, an {@link IllegalStateException} is generated on instantiation too.
  68  *
  69  * @author David A. Velasco
  70  */
  71 public class PreviewMediaFragment extends FileFragment implements
  72         OnTouchListener,
  73         ConfirmationDialogFragment.ConfirmationDialogFragmentListener  {
  74
  75     public static final String EXTRA_FILE = "FILE";
  76     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  77     private static final String EXTRA_PLAY_POSITION = "PLAY_POSITION";
  78     private static final String EXTRA_PLAYING = "PLAYING";
  79
  80     private View mView;
  81     private Account mAccount;
  82     private ImageView mImagePreview;
  83     private VideoView mVideoPreview;
  84     private int mSavedPlaybackPosition;
  85
  86     private MediaServiceBinder mMediaServiceBinder = null;
  87     private MediaControlView mMediaController = null;
  88     private MediaServiceConnection mMediaServiceConnection = null;
  89     private VideoHelper mVideoHelper;
  90     private boolean mAutoplay;
  91     public boolean mPrepared;
  92
  93     private static final String TAG = PreviewMediaFragment.class.getSimpleName();
  94
  95
  96     /**
  97      * Creates a fragment to preview a file.
  98      *
  99      * When 'fileToDetail' or 'ocAccount' are null
 100      *
 101      * @param fileToDetail      An {@link OCFile} to preview in the fragment
 102      * @param ocAccount         An ownCloud account; needed to start downloads
 103      */
 104     public PreviewMediaFragment(OCFile fileToDetail, Account ocAccount, int startPlaybackPosition, boolean autoplay) {
 105         super(fileToDetail);
 106         mAccount = ocAccount;
 107         mSavedPlaybackPosition = startPlaybackPosition;
 108         mAutoplay = autoplay;
 109     }
 110
 111
 112     /**
 113      *  Creates an empty fragment for previews.
 114      *
 115      *  MUST BE KEPT: the system uses it when tries to reinstantiate a fragment automatically (for instance, when the device is turned a aside).
 116      *
 117      *  DO NOT CALL IT: an {@link OCFile} and {@link Account} must be provided for a successful construction
 118      */
 119     public PreviewMediaFragment() {
 120         super();
 121         mAccount = null;
 122         mSavedPlaybackPosition = 0;
 123         mAutoplay = true;
 124     }
 125
 126
 127     /**
 128      * {@inheritDoc}
 129      */
 130     @Override
 131     public void onCreate(Bundle savedInstanceState) {
 132         super.onCreate(savedInstanceState);
 133         setHasOptionsMenu(true);
 134     }
 135
 136
 137     /**
 138      * {@inheritDoc}
 139      */
 140     @Override
 141     public View onCreateView(LayoutInflater inflater, ViewGroup container,
 142             Bundle savedInstanceState) {
 143         super.onCreateView(inflater, container, savedInstanceState);
 144         Log_OC.e(TAG, "onCreateView");
 145
 146
 147         mView = inflater.inflate(R.layout.file_preview, container, false);
 148
 149         mImagePreview = (ImageView)mView.findViewById(R.id.image_preview);
 150         mVideoPreview = (VideoView)mView.findViewById(R.id.video_preview);
 151         mVideoPreview.setOnTouchListener(this);
 152
 153         mMediaController = (MediaControlView)mView.findViewById(R.id.media_controller);
 154
 155         return mView;
 156     }
 157
 158
 159     /**
 160      * {@inheritDoc}
 161      */
 162     @Override
 163     public void onActivityCreated(Bundle savedInstanceState) {
 164         super.onActivityCreated(savedInstanceState);
 165         Log_OC.e(TAG, "onActivityCreated");
 166
 167         if (savedInstanceState != null) {
 168             setFile((OCFile)savedInstanceState.getParcelable(PreviewMediaFragment.EXTRA_FILE));
 169             mAccount = savedInstanceState.getParcelable(PreviewMediaFragment.EXTRA_ACCOUNT);
 170             mSavedPlaybackPosition = savedInstanceState.getInt(PreviewMediaFragment.EXTRA_PLAY_POSITION);
 171             mAutoplay = savedInstanceState.getBoolean(PreviewMediaFragment.EXTRA_PLAYING);
 172
 173         }
 174         OCFile file = getFile();
 175         if (file == null) {
 176             throw new IllegalStateException("Instanced with a NULL OCFile");
 177         }
 178         if (mAccount == null) {
 179             throw new IllegalStateException("Instanced with a NULL ownCloud Account");
 180         }
 181         if (!file.isDown()) {
 182             throw new IllegalStateException("There is no local file to preview");
 183         }
 184         if (file.isVideo()) {
 185             mVideoPreview.setVisibility(View.VISIBLE);
 186             mImagePreview.setVisibility(View.GONE);
 187             prepareVideo();
 188
 189         } else {
 190             mVideoPreview.setVisibility(View.GONE);
 191             mImagePreview.setVisibility(View.VISIBLE);
 192         }
 193
 194     }
 195
 196
 197     /**
 198      * {@inheritDoc}
 199      */
 200     @Override
 201     public void onSaveInstanceState(Bundle outState) {
 202         super.onSaveInstanceState(outState);
 203         Log_OC.e(TAG, "onSaveInstanceState");
 204
 205         outState.putParcelable(PreviewMediaFragment.EXTRA_FILE, getFile());
 206         outState.putParcelable(PreviewMediaFragment.EXTRA_ACCOUNT, mAccount);
 207
 208         if (getFile().isVideo()) {
 209             mSavedPlaybackPosition = mVideoPreview.getCurrentPosition();
 210             mAutoplay = mVideoPreview.isPlaying();
 211             outState.putInt(PreviewMediaFragment.EXTRA_PLAY_POSITION , mSavedPlaybackPosition);
 212             outState.putBoolean(PreviewMediaFragment.EXTRA_PLAYING , mAutoplay);
 213         } else {
 214             outState.putInt(PreviewMediaFragment.EXTRA_PLAY_POSITION , mMediaServiceBinder.getCurrentPosition());
 215             outState.putBoolean(PreviewMediaFragment.EXTRA_PLAYING , mMediaServiceBinder.isPlaying());
 216         }
 217     }
 218
 219
 220     @Override
 221     public void onStart() {
 222         super.onStart();
 223         Log_OC.e(TAG, "onStart");
 224
 225         OCFile file = getFile();
 226         if (file != null) {
 227            if (file.isAudio()) {
 228                bindMediaService();
 229
 230            } else if (file.isVideo()) {
 231                stopAudio();
 232                playVideo();
 233            }
 234         }
 235     }
 236
 237
 238     private void stopAudio() {
 239         Intent i = new Intent(getSherlockActivity(), MediaService.class);
 240         i.setAction(MediaService.ACTION_STOP_ALL);
 241         getSherlockActivity().startService(i);
 242     }
 243
 244
 245     /**
 246      * {@inheritDoc}
 247      */
 248     @Override
 249     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 250         super.onCreateOptionsMenu(menu, inflater);
 251
 252         inflater.inflate(R.menu.file_actions_menu, menu);
 253         List<Integer> toHide = new ArrayList<Integer>();
 254
 255         MenuItem item = null;
 256         toHide.add(R.id.action_cancel_download);
 257         toHide.add(R.id.action_cancel_upload);
 258         toHide.add(R.id.action_download_file);
 259         toHide.add(R.id.action_sync_file);
 260         toHide.add(R.id.action_rename_file);    // by now
 261
 262         // Options shareLink
 263         if (!getFile().isShareByLink()) {
 264             toHide.add(R.id.action_unshare_file);
 265         }
 266
 267         // Send file
 268         boolean sendEnabled = getString(R.string.send_files_to_other_apps).equalsIgnoreCase("on");
 269         if (!sendEnabled) {
 270             toHide.add(R.id.action_send_file);
 271         }
 272
 273         for (int i : toHide) {
 274             item = menu.findItem(i);
 275             if (item != null) {
 276                 item.setVisible(false);
 277                 item.setEnabled(false);
 278             }
 279         }
 280
 281     }
 282
 283
 284     /**
 285      * {@inheritDoc}
 286      */
 287     @Override
 288     public void onPrepareOptionsMenu(Menu menu) {
 289         super.onPrepareOptionsMenu(menu);
 290
 291         MenuItem item = menu.findItem(R.id.action_unshare_file);
 292         // Options shareLink
 293         if (!getFile().isShareByLink()) {
 294             item.setVisible(false);
 295             item.setEnabled(false);
 296         } else {
 297             item.setVisible(true);
 298             item.setEnabled(true);
 299         }
 300     }
 301
 302
 303     /**
 304      * {@inheritDoc}
 305      */
 306     @Override
 307     public boolean onOptionsItemSelected(MenuItem item) {
 308         switch (item.getItemId()) {
 309             case R.id.action_share_file: {
 310                 shareFileWithLink();
 311                 return true;
 312             }
 313             case R.id.action_unshare_file: {
 314                 unshareFileWithLink();
 315                 return true;
 316             }
 317             case R.id.action_open_file_with: {
 318                 openFile();
 319                 return true;
 320             }
 321             case R.id.action_remove_file: {
 322                 removeFile();
 323                 return true;
 324             }
 325             case R.id.action_see_details: {
 326                 seeDetails();
 327                 return true;
 328             }
 329             case R.id.action_send_file: {
 330                 sendFile();
 331             }
 332
 333             default:
 334                 return false;
 335         }
 336     }
 337
 338
 339
 340     /**
 341      * Update the file of the fragment with file value
 342      * @param file
 343      */
 344     public void updateFile(OCFile file){
 345         setFile(file);
 346     }
 347
 348     private void unshareFileWithLink() {
 349         stopPreview(false);
 350         mContainerActivity.getFileOperationsHelper().unshareFileWithLink(getFile());
 351     }
 352
 353     private void shareFileWithLink() {
 354         stopPreview(false);
 355         mContainerActivity.getFileOperationsHelper().shareFileWithLink(getFile());
 356
 357     }
 358
 359     private void sendFile() {
 360         stopPreview(false);
 361         mContainerActivity.getFileOperationsHelper().sendDownloadedFile(getFile());
 362
 363     }
 364
 365     private void seeDetails() {
 366         stopPreview(false);
 367         mContainerActivity.showDetails(getFile());
 368     }
 369
 370
 371     private void prepareVideo() {
 372         // create helper to get more control on the playback
 373         mVideoHelper = new VideoHelper();
 374         mVideoPreview.setOnPreparedListener(mVideoHelper);
 375         mVideoPreview.setOnCompletionListener(mVideoHelper);
 376         mVideoPreview.setOnErrorListener(mVideoHelper);
 377     }
 378
 379     private void playVideo() {
 380         // create and prepare control panel for the user
 381         mMediaController.setMediaPlayer(mVideoPreview);
 382
 383         // load the video file in the video player ; when done, VideoHelper#onPrepared() will be called
 384         mVideoPreview.setVideoPath(getFile().getStoragePath());
 385     }
 386
 387
 388     private class VideoHelper implements OnCompletionListener, OnPreparedListener, OnErrorListener {
 389
 390         /**
 391          * Called when the file is ready to be played.
 392          *
 393          * Just starts the playback.
 394          *
 395          * @param   mp    {@link MediaPlayer} instance performing the playback.
 396          */
 397         @Override
 398         public void onPrepared(MediaPlayer vp) {
 399             Log_OC.e(TAG, "onPrepared");
 400             mVideoPreview.seekTo(mSavedPlaybackPosition);
 401             if (mAutoplay) {
 402                 mVideoPreview.start();
 403             }
 404             mMediaController.setEnabled(true);
 405             mMediaController.updatePausePlay();
 406             mPrepared = true;
 407         }
 408
 409
 410         /**
 411          * Called when the file is finished playing.
 412          *
 413          * Finishes the activity.
 414          *
 415          * @param   mp    {@link MediaPlayer} instance performing the playback.
 416          */
 417         @Override
 418         public void onCompletion(MediaPlayer  mp) {
 419             Log_OC.e(TAG, "completed");
 420             if (mp != null) {
 421                 mVideoPreview.seekTo(0);
 422                 // next lines are necessary to work around undesired video loops
 423                 if (Build.VERSION.SDK_INT == Build.VERSION_CODES.GINGERBREAD) {
 424                     mVideoPreview.pause();
 425
 426                 } else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.GINGERBREAD_MR1) {
 427                     // mVideePreview.pause() is not enough
 428
 429                     mMediaController.setEnabled(false);
 430                     mVideoPreview.stopPlayback();
 431                     mAutoplay = false;
 432                     mSavedPlaybackPosition = 0;
 433                     mVideoPreview.setVideoPath(getFile().getStoragePath());
 434                 }
 435             } // else : called from onError()
 436             mMediaController.updatePausePlay();
 437         }
 438
 439
 440         /**
 441          * Called when an error in playback occurs.
 442          *
 443          * @param   mp      {@link MediaPlayer} instance performing the playback.
 444          * @param   what    Type of error
 445          * @param   extra   Extra code specific to the error
 446          */
 447         @Override
 448         public boolean onError(MediaPlayer mp, int what, int extra) {
 449             if (mVideoPreview.getWindowToken() != null) {
 450                 String message = MediaService.getMessageForMediaError(getSherlockActivity(), what, extra);
 451                 new AlertDialog.Builder(getSherlockActivity())
 452                         .setMessage(message)
 453                         .setPositiveButton(android.R.string.VideoView_error_button,
 454                                 new DialogInterface.OnClickListener() {
 455                                     public void onClick(DialogInterface dialog, int whichButton) {
 456                                         dialog.dismiss();
 457                                         VideoHelper.this.onCompletion(null);
 458                                     }
 459                                 })
 460                         .setCancelable(false)
 461                         .show();
 462             }
 463             return true;
 464         }
 465
 466     }
 467
 468
 469     @Override
 470     public void onPause() {
 471         super.onPause();
 472         Log_OC.e(TAG, "onPause");
 473     }
 474
 475     @Override
 476     public void onResume() {
 477         super.onResume();
 478         Log_OC.e(TAG, "onResume");
 479     }
 480
 481     @Override
 482     public void onDestroy() {
 483         super.onDestroy();
 484         Log_OC.e(TAG, "onDestroy");
 485     }
 486
 487     @Override
 488     public void onStop() {
 489         Log_OC.e(TAG, "onStop");
 490         super.onStop();
 491
 492         mPrepared = false;
 493         if (mMediaServiceConnection != null) {
 494             Log_OC.d(TAG, "Unbinding from MediaService ...");
 495             if (mMediaServiceBinder != null && mMediaController != null) {
 496                 mMediaServiceBinder.unregisterMediaController(mMediaController);
 497             }
 498             getSherlockActivity().unbindService(mMediaServiceConnection);
 499             mMediaServiceConnection = null;
 500             mMediaServiceBinder = null;
 501         }
 502     }
 503
 504     @Override
 505     public boolean onTouch(View v, MotionEvent event) {
 506         if (event.getAction() == MotionEvent.ACTION_DOWN && v == mVideoPreview) {
 507             startFullScreenVideo();
 508             return true;
 509         }
 510         return false;
 511     }
 512
 513
 514     private void startFullScreenVideo() {
 515         Intent i = new Intent(getSherlockActivity(), PreviewVideoActivity.class);
 516         i.putExtra(FileActivity.EXTRA_ACCOUNT, mAccount);
 517         i.putExtra(FileActivity.EXTRA_FILE, getFile());
 518         i.putExtra(PreviewVideoActivity.EXTRA_AUTOPLAY, mVideoPreview.isPlaying());
 519         mVideoPreview.pause();
 520         i.putExtra(PreviewVideoActivity.EXTRA_START_POSITION, mVideoPreview.getCurrentPosition());
 521         startActivityForResult(i, 0);
 522     }
 523
 524     @Override
 525     public void onConfigurationChanged (Configuration newConfig) {
 526         Log_OC.e(TAG, "onConfigurationChanged " + this);
 527     }
 528
 529     @Override
 530     public void onActivityResult (int requestCode, int resultCode, Intent data) {
 531         Log_OC.e(TAG, "onActivityResult " + this);
 532         super.onActivityResult(requestCode, resultCode, data);
 533         if (resultCode == Activity.RESULT_OK) {
 534             mSavedPlaybackPosition = data.getExtras().getInt(PreviewVideoActivity.EXTRA_START_POSITION);
 535             mAutoplay = data.getExtras().getBoolean(PreviewVideoActivity.EXTRA_AUTOPLAY);
 536         }
 537     }
 538
 539
 540     private void playAudio() {
 541         OCFile file = getFile();
 542         if (!mMediaServiceBinder.isPlaying(file)) {
 543             Log_OC.d(TAG, "starting playback of " + file.getStoragePath());
 544             mMediaServiceBinder.start(mAccount, file, mAutoplay, mSavedPlaybackPosition);
 545
 546         } else {
 547             if (!mMediaServiceBinder.isPlaying() && mAutoplay) {
 548                 mMediaServiceBinder.start();
 549                 mMediaController.updatePausePlay();
 550             }
 551         }
 552     }
 553
 554
 555     private void bindMediaService() {
 556         Log_OC.d(TAG, "Binding to MediaService...");
 557         if (mMediaServiceConnection == null) {
 558             mMediaServiceConnection = new MediaServiceConnection();
 559         }
 560         getSherlockActivity().bindService(  new Intent(getSherlockActivity(),
 561                                     MediaService.class),
 562                                     mMediaServiceConnection,
 563                                     Context.BIND_AUTO_CREATE);
 564             // follow the flow in MediaServiceConnection#onServiceConnected(...)
 565     }
 566
 567     /** Defines callbacks for service binding, passed to bindService() */
 568     private class MediaServiceConnection implements ServiceConnection {
 569
 570         @Override
 571         public void onServiceConnected(ComponentName component, IBinder service) {
 572             if (getSherlockActivity() != null) {
 573                 if (component.equals(new ComponentName(getSherlockActivity(), MediaService.class))) {
 574                     Log_OC.d(TAG, "Media service connected");
 575                     mMediaServiceBinder = (MediaServiceBinder) service;
 576                     if (mMediaServiceBinder != null) {
 577                         prepareMediaController();
 578                         playAudio();    // do not wait for the touch of nobody to play audio
 579
 580                         Log_OC.d(TAG, "Successfully bound to MediaService, MediaController ready");
 581
 582                     } else {
 583                         Log_OC.e(TAG, "Unexpected response from MediaService while binding");
 584                     }
 585                 }
 586             }
 587         }
 588
 589         private void prepareMediaController() {
 590             mMediaServiceBinder.registerMediaController(mMediaController);
 591             if (mMediaController != null) {
 592                 mMediaController.setMediaPlayer(mMediaServiceBinder);
 593                 mMediaController.setEnabled(true);
 594                 mMediaController.updatePausePlay();
 595             }
 596         }
 597
 598         @Override
 599         public void onServiceDisconnected(ComponentName component) {
 600             if (component.equals(new ComponentName(getSherlockActivity(), MediaService.class))) {
 601                 Log_OC.e(TAG, "Media service suddenly disconnected");
 602                 if (mMediaController != null) {
 603                     mMediaController.setMediaPlayer(null);
 604                 } else {
 605                     Toast.makeText(getSherlockActivity(), "No media controller to release when disconnected from media service", Toast.LENGTH_SHORT).show();
 606                 }
 607                 mMediaServiceBinder = null;
 608                 mMediaServiceConnection = null;
 609             }
 610         }
 611     }
 612
 613
 614
 615     /**
 616      * Opens the previewed file with an external application.
 617      */
 618     private void openFile() {
 619         stopPreview(true);
 620         mContainerActivity.getFileOperationsHelper().openFile(getFile());
 621         finish();
 622     }
 623
 624     /**
 625      * Starts a the removal of the previewed file.
 626      *
 627      * Shows a confirmation dialog. The action continues in {@link #onConfirmation(String)} , {@link #onNeutral(String)} or {@link #onCancel(String)},
 628      * depending upon the user selection in the dialog.
 629      */
 630     private void removeFile() {
 631         ConfirmationDialogFragment confDialog = ConfirmationDialogFragment.newInstance(
 632                 R.string.confirmation_remove_alert,
 633                 new String[]{getFile().getFileName()},
 634                 R.string.confirmation_remove_remote_and_local,
 635                 R.string.confirmation_remove_local,
 636                 R.string.common_cancel);
 637         confDialog.setOnConfirmationListener(this);
 638         confDialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 639     }
 640
 641
 642     /**
 643      * Performs the removal of the previewed file, both locally and in the server.
 644      */
 645     @Override
 646     public void onConfirmation(String callerTag) {
 647         OCFile file = getFile();
 648         FileDataStorageManager storageManager = mContainerActivity.getStorageManager();
 649         if (storageManager.getFileById(file.getFileId()) != null) {   // check that the file is still there;
 650             stopPreview(true);
 651             mContainerActivity.getFileOperationsHelper().removeFile(file, true);
 652         }
 653     }
 654
 655
 656     /**
 657      * Removes the file from local storage
 658      */
 659     @Override
 660     public void onNeutral(String callerTag) {
 661         OCFile file = getFile();
 662         stopPreview(true);
 663         mContainerActivity.getStorageManager().removeFile(file, false, true);    // TODO perform in background task / new thread
 664         finish();
 665     }
 666
 667     /**
 668      * User cancelled the removal action.
 669      */
 670     @Override
 671     public void onCancel(String callerTag) {
 672         // nothing to do here
 673     }
 674
 675
 676     /**
 677      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewMediaFragment} to be previewed.
 678      *
 679      * @param file      File to test if can be previewed.
 680      * @return          'True' if the file can be handled by the fragment.
 681      */
 682     public static boolean canBePreviewed(OCFile file) {
 683         return (file != null && (file.isAudio() || file.isVideo()));
 684     }
 685
 686
 687     private void stopPreview(boolean stopAudio) {
 688         OCFile file = getFile();
 689         if (file.isAudio() && stopAudio) {
 690             mMediaServiceBinder.pause();
 691
 692         } else if (file.isVideo()) {
 693             mVideoPreview.stopPlayback();
 694         }
 695     }
 696
 697
 698
 699     /**
 700      * Finishes the preview
 701      */
 702     private void finish() {
 703         getSherlockActivity().onBackPressed();
 704     }
 705
 706
 707     public int getPosition() {
 708         if (mPrepared) {
 709             mSavedPlaybackPosition = mVideoPreview.getCurrentPosition();
 710         }
 711         Log_OC.e(TAG, "getting position: " + mSavedPlaybackPosition);
 712         return mSavedPlaybackPosition;
 713     }
 714
 715     public boolean isPlaying() {
 716         if (mPrepared) {
 717             mAutoplay = mVideoPreview.isPlaying();
 718         }
 719         return mAutoplay;
 720     }
 721
 722 }