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 android.accounts.Account;
  20 import android.app.Activity;
  21 import android.app.AlertDialog;
  22 import android.content.ComponentName;
  23 import android.content.Context;
  24 import android.content.DialogInterface;
  25 import android.content.Intent;
  26 import android.content.ServiceConnection;
  27 import android.content.res.Configuration;
  28 import android.media.MediaPlayer;
  29 import android.media.MediaPlayer.OnCompletionListener;
  30 import android.media.MediaPlayer.OnErrorListener;
  31 import android.media.MediaPlayer.OnPreparedListener;
  32 import android.os.Build;
  33 import android.os.Bundle;
  34 import android.os.IBinder;
  35 import android.view.LayoutInflater;
  36 import android.view.MotionEvent;
  37 import android.view.View;
  38 import android.view.View.OnTouchListener;
  39 import android.view.ViewGroup;
  40 import android.widget.ImageView;
  41 import android.widget.Toast;
  42 import android.widget.VideoView;
  43
  44 import com.actionbarsherlock.view.Menu;
  45 import com.actionbarsherlock.view.MenuInflater;
  46 import com.actionbarsherlock.view.MenuItem;
  47 import com.owncloud.android.R;
  48 import com.owncloud.android.datamodel.FileDataStorageManager;
  49 import com.owncloud.android.datamodel.OCFile;
  50 import com.owncloud.android.files.FileMenuFilter;
  51 import com.owncloud.android.media.MediaControlView;
  52 import com.owncloud.android.media.MediaService;
  53 import com.owncloud.android.media.MediaServiceBinder;
  54 import com.owncloud.android.ui.activity.FileActivity;
  55 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
  56 import com.owncloud.android.ui.fragment.FileFragment;
  57 import com.owncloud.android.utils.Log_OC;
  58
  59
  60 /**
  61  * This fragment shows a preview of a downloaded media file (audio or video).
  62  *
  63  * Trying to get an instance with NULL {@link OCFile} or ownCloud {@link Account} values will produce an {@link IllegalStateException}.
  64  *
  65  * By now, if the {@link OCFile} passed is not downloaded, an {@link IllegalStateException} is generated on instantiation too.
  66  *
  67  * @author David A. Velasco
  68  */
  69 public class PreviewMediaFragment extends FileFragment implements
  70         OnTouchListener,
  71         ConfirmationDialogFragment.ConfirmationDialogFragmentListener  {
  72
  73     public static final String EXTRA_FILE = "FILE";
  74     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  75     private static final String EXTRA_PLAY_POSITION = "PLAY_POSITION";
  76     private static final String EXTRA_PLAYING = "PLAYING";
  77
  78     private View mView;
  79     private Account mAccount;
  80     private ImageView mImagePreview;
  81     private VideoView mVideoPreview;
  82     private int mSavedPlaybackPosition;
  83
  84     private MediaServiceBinder mMediaServiceBinder = null;
  85     private MediaControlView mMediaController = null;
  86     private MediaServiceConnection mMediaServiceConnection = null;
  87     private VideoHelper mVideoHelper;
  88     private boolean mAutoplay;
  89     public boolean mPrepared;
  90
  91     private static final String TAG = PreviewMediaFragment.class.getSimpleName();
  92
  93
  94     /**
  95      * Creates a fragment to preview a file.
  96      *
  97      * When 'fileToDetail' or 'ocAccount' are null
  98      *
  99      * @param fileToDetail      An {@link OCFile} to preview in the fragment
 100      * @param ocAccount         An ownCloud account; needed to start downloads
 101      */
 102     public PreviewMediaFragment(OCFile fileToDetail, Account ocAccount, int startPlaybackPosition, boolean autoplay) {
 103         super(fileToDetail);
 104         mAccount = ocAccount;
 105         mSavedPlaybackPosition = startPlaybackPosition;
 106         mAutoplay = autoplay;
 107     }
 108
 109
 110     /**
 111      *  Creates an empty fragment for previews.
 112      *
 113      *  MUST BE KEPT: the system uses it when tries to reinstantiate a fragment automatically (for instance, when the device is turned a aside).
 114      *
 115      *  DO NOT CALL IT: an {@link OCFile} and {@link Account} must be provided for a successful construction
 116      */
 117     public PreviewMediaFragment() {
 118         super();
 119         mAccount = null;
 120         mSavedPlaybackPosition = 0;
 121         mAutoplay = true;
 122     }
 123
 124
 125     /**
 126      * {@inheritDoc}
 127      */
 128     @Override
 129     public void onCreate(Bundle savedInstanceState) {
 130         super.onCreate(savedInstanceState);
 131         setHasOptionsMenu(true);
 132     }
 133
 134
 135     /**
 136      * {@inheritDoc}
 137      */
 138     @Override
 139     public View onCreateView(LayoutInflater inflater, ViewGroup container,
 140             Bundle savedInstanceState) {
 141         super.onCreateView(inflater, container, savedInstanceState);
 142         Log_OC.e(TAG, "onCreateView");
 143
 144
 145         mView = inflater.inflate(R.layout.file_preview, container, false);
 146
 147         mImagePreview = (ImageView)mView.findViewById(R.id.image_preview);
 148         mVideoPreview = (VideoView)mView.findViewById(R.id.video_preview);
 149         mVideoPreview.setOnTouchListener(this);
 150
 151         mMediaController = (MediaControlView)mView.findViewById(R.id.media_controller);
 152
 153         return mView;
 154     }
 155
 156
 157     /**
 158      * {@inheritDoc}
 159      */
 160     @Override
 161     public void onActivityCreated(Bundle savedInstanceState) {
 162         super.onActivityCreated(savedInstanceState);
 163         Log_OC.e(TAG, "onActivityCreated");
 164
 165         if (savedInstanceState != null) {
 166             setFile((OCFile)savedInstanceState.getParcelable(PreviewMediaFragment.EXTRA_FILE));
 167             mAccount = savedInstanceState.getParcelable(PreviewMediaFragment.EXTRA_ACCOUNT);
 168             mSavedPlaybackPosition = savedInstanceState.getInt(PreviewMediaFragment.EXTRA_PLAY_POSITION);
 169             mAutoplay = savedInstanceState.getBoolean(PreviewMediaFragment.EXTRA_PLAYING);
 170
 171         }
 172         OCFile file = getFile();
 173         if (file == null) {
 174             throw new IllegalStateException("Instanced with a NULL OCFile");
 175         }
 176         if (mAccount == null) {
 177             throw new IllegalStateException("Instanced with a NULL ownCloud Account");
 178         }
 179         if (!file.isDown()) {
 180             throw new IllegalStateException("There is no local file to preview");
 181         }
 182         if (file.isVideo()) {
 183             mVideoPreview.setVisibility(View.VISIBLE);
 184             mImagePreview.setVisibility(View.GONE);
 185             prepareVideo();
 186
 187         } else {
 188             mVideoPreview.setVisibility(View.GONE);
 189             mImagePreview.setVisibility(View.VISIBLE);
 190         }
 191
 192     }
 193
 194
 195     /**
 196      * {@inheritDoc}
 197      */
 198     @Override
 199     public void onSaveInstanceState(Bundle outState) {
 200         super.onSaveInstanceState(outState);
 201         Log_OC.e(TAG, "onSaveInstanceState");
 202
 203         outState.putParcelable(PreviewMediaFragment.EXTRA_FILE, getFile());
 204         outState.putParcelable(PreviewMediaFragment.EXTRA_ACCOUNT, mAccount);
 205
 206         if (getFile().isVideo()) {
 207             mSavedPlaybackPosition = mVideoPreview.getCurrentPosition();
 208             mAutoplay = mVideoPreview.isPlaying();
 209             outState.putInt(PreviewMediaFragment.EXTRA_PLAY_POSITION , mSavedPlaybackPosition);
 210             outState.putBoolean(PreviewMediaFragment.EXTRA_PLAYING , mAutoplay);
 211         } else {
 212             outState.putInt(PreviewMediaFragment.EXTRA_PLAY_POSITION , mMediaServiceBinder.getCurrentPosition());
 213             outState.putBoolean(PreviewMediaFragment.EXTRA_PLAYING , mMediaServiceBinder.isPlaying());
 214         }
 215     }
 216
 217
 218     @Override
 219     public void onStart() {
 220         super.onStart();
 221         Log_OC.e(TAG, "onStart");
 222
 223         OCFile file = getFile();
 224         if (file != null) {
 225            if (file.isAudio()) {
 226                bindMediaService();
 227
 228            } else if (file.isVideo()) {
 229                stopAudio();
 230                playVideo();
 231            }
 232         }
 233     }
 234
 235
 236     private void stopAudio() {
 237         Intent i = new Intent(getSherlockActivity(), MediaService.class);
 238         i.setAction(MediaService.ACTION_STOP_ALL);
 239         getSherlockActivity().startService(i);
 240     }
 241
 242
 243     /**
 244      * {@inheritDoc}
 245      */
 246     @Override
 247     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 248         super.onCreateOptionsMenu(menu, inflater);
 249
 250         inflater.inflate(R.menu.file_actions_menu, menu);
 251         /*
 252         List<Integer> toHide = new ArrayList<Integer>();
 253
 254         MenuItem item = null;
 255         toHide.add(R.id.action_cancel_download);
 256         toHide.add(R.id.action_cancel_upload);
 257         toHide.add(R.id.action_download_file);
 258         toHide.add(R.id.action_sync_file);
 259         toHide.add(R.id.action_rename_file);    // by now
 260
 261         // Options shareLink
 262         if (!getFile().isShareByLink()) {
 263             toHide.add(R.id.action_unshare_file);
 264         }
 265
 266         // Send file
 267         boolean sendEnabled = getString(R.string.send_files_to_other_apps).equalsIgnoreCase("on");
 268         if (!sendEnabled) {
 269             toHide.add(R.id.action_send_file);
 270         }
 271
 272         for (int i : toHide) {
 273             item = menu.findItem(i);
 274             if (item != null) {
 275                 item.setVisible(false);
 276                 item.setEnabled(false);
 277             }
 278         }
 279         */
 280
 281     }
 282
 283
 284     /**
 285      * {@inheritDoc}
 286      */
 287     @Override
 288     public void onPrepareOptionsMenu(Menu menu) {
 289         super.onPrepareOptionsMenu(menu);
 290
 291         FileMenuFilter mf = new FileMenuFilter();
 292         mf.setFile(getFile());
 293         mf.setComponentGetter(mContainerActivity);
 294         mf.setAccount(mContainerActivity.getStorageManager().getAccount());
 295         mf.setContext(getSherlockActivity());
 296         mf.setFragment(this);
 297         mf.filter(menu);
 298
 299         /*
 300         MenuItem item = menu.findItem(R.id.action_unshare_file);
 301         // Options shareLink
 302         if (!getFile().isShareByLink()) {
 303             item.setVisible(false);
 304             item.setEnabled(false);
 305         } else {
 306             item.setVisible(true);
 307             item.setEnabled(true);
 308         }
 309         */
 310     }
 311
 312
 313     /**
 314      * {@inheritDoc}
 315      */
 316     @Override
 317     public boolean onOptionsItemSelected(MenuItem item) {
 318         switch (item.getItemId()) {
 319             case R.id.action_share_file: {
 320                 shareFileWithLink();
 321                 return true;
 322             }
 323             case R.id.action_unshare_file: {
 324                 unshareFileWithLink();
 325                 return true;
 326             }
 327             case R.id.action_open_file_with: {
 328                 openFile();
 329                 return true;
 330             }
 331             case R.id.action_remove_file: {
 332                 removeFile();
 333                 return true;
 334             }
 335             case R.id.action_see_details: {
 336                 seeDetails();
 337                 return true;
 338             }
 339             case R.id.action_send_file: {
 340                 sendFile();
 341             }
 342
 343             default:
 344                 return false;
 345         }
 346     }
 347
 348
 349
 350     /**
 351      * Update the file of the fragment with file value
 352      * @param file
 353      */
 354     public void updateFile(OCFile file){
 355         setFile(file);
 356     }
 357
 358     private void unshareFileWithLink() {
 359         stopPreview(false);
 360         mContainerActivity.getFileOperationsHelper().unshareFileWithLink(getFile());
 361     }
 362
 363     private void shareFileWithLink() {
 364         stopPreview(false);
 365         mContainerActivity.getFileOperationsHelper().shareFileWithLink(getFile());
 366
 367     }
 368
 369     private void sendFile() {
 370         stopPreview(false);
 371         mContainerActivity.getFileOperationsHelper().sendDownloadedFile(getFile());
 372
 373     }
 374
 375     private void seeDetails() {
 376         stopPreview(false);
 377         mContainerActivity.showDetails(getFile());
 378     }
 379
 380
 381     private void prepareVideo() {
 382         // create helper to get more control on the playback
 383         mVideoHelper = new VideoHelper();
 384         mVideoPreview.setOnPreparedListener(mVideoHelper);
 385         mVideoPreview.setOnCompletionListener(mVideoHelper);
 386         mVideoPreview.setOnErrorListener(mVideoHelper);
 387     }
 388
 389     private void playVideo() {
 390         // create and prepare control panel for the user
 391         mMediaController.setMediaPlayer(mVideoPreview);
 392
 393         // load the video file in the video player ; when done, VideoHelper#onPrepared() will be called
 394         mVideoPreview.setVideoPath(getFile().getStoragePath());
 395     }
 396
 397
 398     private class VideoHelper implements OnCompletionListener, OnPreparedListener, OnErrorListener {
 399
 400         /**
 401          * Called when the file is ready to be played.
 402          *
 403          * Just starts the playback.
 404          *
 405          * @param   mp    {@link MediaPlayer} instance performing the playback.
 406          */
 407         @Override
 408         public void onPrepared(MediaPlayer vp) {
 409             Log_OC.e(TAG, "onPrepared");
 410             mVideoPreview.seekTo(mSavedPlaybackPosition);
 411             if (mAutoplay) {
 412                 mVideoPreview.start();
 413             }
 414             mMediaController.setEnabled(true);
 415             mMediaController.updatePausePlay();
 416             mPrepared = true;
 417         }
 418
 419
 420         /**
 421          * Called when the file is finished playing.
 422          *
 423          * Finishes the activity.
 424          *
 425          * @param   mp    {@link MediaPlayer} instance performing the playback.
 426          */
 427         @Override
 428         public void onCompletion(MediaPlayer  mp) {
 429             Log_OC.e(TAG, "completed");
 430             if (mp != null) {
 431                 mVideoPreview.seekTo(0);
 432                 // next lines are necessary to work around undesired video loops
 433                 if (Build.VERSION.SDK_INT == Build.VERSION_CODES.GINGERBREAD) {
 434                     mVideoPreview.pause();
 435
 436                 } else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.GINGERBREAD_MR1) {
 437                     // mVideePreview.pause() is not enough
 438
 439                     mMediaController.setEnabled(false);
 440                     mVideoPreview.stopPlayback();
 441                     mAutoplay = false;
 442                     mSavedPlaybackPosition = 0;
 443                     mVideoPreview.setVideoPath(getFile().getStoragePath());
 444                 }
 445             } // else : called from onError()
 446             mMediaController.updatePausePlay();
 447         }
 448
 449
 450         /**
 451          * Called when an error in playback occurs.
 452          *
 453          * @param   mp      {@link MediaPlayer} instance performing the playback.
 454          * @param   what    Type of error
 455          * @param   extra   Extra code specific to the error
 456          */
 457         @Override
 458         public boolean onError(MediaPlayer mp, int what, int extra) {
 459             if (mVideoPreview.getWindowToken() != null) {
 460                 String message = MediaService.getMessageForMediaError(getSherlockActivity(), what, extra);
 461                 new AlertDialog.Builder(getSherlockActivity())
 462                         .setMessage(message)
 463                         .setPositiveButton(android.R.string.VideoView_error_button,
 464                                 new DialogInterface.OnClickListener() {
 465                                     public void onClick(DialogInterface dialog, int whichButton) {
 466                                         dialog.dismiss();
 467                                         VideoHelper.this.onCompletion(null);
 468                                     }
 469                                 })
 470                         .setCancelable(false)
 471                         .show();
 472             }
 473             return true;
 474         }
 475
 476     }
 477
 478
 479     @Override
 480     public void onPause() {
 481         super.onPause();
 482         Log_OC.e(TAG, "onPause");
 483     }
 484
 485     @Override
 486     public void onResume() {
 487         super.onResume();
 488         Log_OC.e(TAG, "onResume");
 489     }
 490
 491     @Override
 492     public void onDestroy() {
 493         super.onDestroy();
 494         Log_OC.e(TAG, "onDestroy");
 495     }
 496
 497     @Override
 498     public void onStop() {
 499         Log_OC.e(TAG, "onStop");
 500         super.onStop();
 501
 502         mPrepared = false;
 503         if (mMediaServiceConnection != null) {
 504             Log_OC.d(TAG, "Unbinding from MediaService ...");
 505             if (mMediaServiceBinder != null && mMediaController != null) {
 506                 mMediaServiceBinder.unregisterMediaController(mMediaController);
 507             }
 508             getSherlockActivity().unbindService(mMediaServiceConnection);
 509             mMediaServiceConnection = null;
 510             mMediaServiceBinder = null;
 511         }
 512     }
 513
 514     @Override
 515     public boolean onTouch(View v, MotionEvent event) {
 516         if (event.getAction() == MotionEvent.ACTION_DOWN && v == mVideoPreview) {
 517             startFullScreenVideo();
 518             return true;
 519         }
 520         return false;
 521     }
 522
 523
 524     private void startFullScreenVideo() {
 525         Intent i = new Intent(getSherlockActivity(), PreviewVideoActivity.class);
 526         i.putExtra(FileActivity.EXTRA_ACCOUNT, mAccount);
 527         i.putExtra(FileActivity.EXTRA_FILE, getFile());
 528         i.putExtra(PreviewVideoActivity.EXTRA_AUTOPLAY, mVideoPreview.isPlaying());
 529         mVideoPreview.pause();
 530         i.putExtra(PreviewVideoActivity.EXTRA_START_POSITION, mVideoPreview.getCurrentPosition());
 531         startActivityForResult(i, 0);
 532     }
 533
 534     @Override
 535     public void onConfigurationChanged (Configuration newConfig) {
 536         Log_OC.e(TAG, "onConfigurationChanged " + this);
 537     }
 538
 539     @Override
 540     public void onActivityResult (int requestCode, int resultCode, Intent data) {
 541         Log_OC.e(TAG, "onActivityResult " + this);
 542         super.onActivityResult(requestCode, resultCode, data);
 543         if (resultCode == Activity.RESULT_OK) {
 544             mSavedPlaybackPosition = data.getExtras().getInt(PreviewVideoActivity.EXTRA_START_POSITION);
 545             mAutoplay = data.getExtras().getBoolean(PreviewVideoActivity.EXTRA_AUTOPLAY);
 546         }
 547     }
 548
 549
 550     private void playAudio() {
 551         OCFile file = getFile();
 552         if (!mMediaServiceBinder.isPlaying(file)) {
 553             Log_OC.d(TAG, "starting playback of " + file.getStoragePath());
 554             mMediaServiceBinder.start(mAccount, file, mAutoplay, mSavedPlaybackPosition);
 555
 556         } else {
 557             if (!mMediaServiceBinder.isPlaying() && mAutoplay) {
 558                 mMediaServiceBinder.start();
 559                 mMediaController.updatePausePlay();
 560             }
 561         }
 562     }
 563
 564
 565     private void bindMediaService() {
 566         Log_OC.d(TAG, "Binding to MediaService...");
 567         if (mMediaServiceConnection == null) {
 568             mMediaServiceConnection = new MediaServiceConnection();
 569         }
 570         getSherlockActivity().bindService(  new Intent(getSherlockActivity(),
 571                                     MediaService.class),
 572                                     mMediaServiceConnection,
 573                                     Context.BIND_AUTO_CREATE);
 574             // follow the flow in MediaServiceConnection#onServiceConnected(...)
 575     }
 576
 577     /** Defines callbacks for service binding, passed to bindService() */
 578     private class MediaServiceConnection implements ServiceConnection {
 579
 580         @Override
 581         public void onServiceConnected(ComponentName component, IBinder service) {
 582             if (getSherlockActivity() != null) {
 583                 if (component.equals(new ComponentName(getSherlockActivity(), MediaService.class))) {
 584                     Log_OC.d(TAG, "Media service connected");
 585                     mMediaServiceBinder = (MediaServiceBinder) service;
 586                     if (mMediaServiceBinder != null) {
 587                         prepareMediaController();
 588                         playAudio();    // do not wait for the touch of nobody to play audio
 589
 590                         Log_OC.d(TAG, "Successfully bound to MediaService, MediaController ready");
 591
 592                     } else {
 593                         Log_OC.e(TAG, "Unexpected response from MediaService while binding");
 594                     }
 595                 }
 596             }
 597         }
 598
 599         private void prepareMediaController() {
 600             mMediaServiceBinder.registerMediaController(mMediaController);
 601             if (mMediaController != null) {
 602                 mMediaController.setMediaPlayer(mMediaServiceBinder);
 603                 mMediaController.setEnabled(true);
 604                 mMediaController.updatePausePlay();
 605             }
 606         }
 607
 608         @Override
 609         public void onServiceDisconnected(ComponentName component) {
 610             if (component.equals(new ComponentName(getSherlockActivity(), MediaService.class))) {
 611                 Log_OC.e(TAG, "Media service suddenly disconnected");
 612                 if (mMediaController != null) {
 613                     mMediaController.setMediaPlayer(null);
 614                 } else {
 615                     Toast.makeText(getSherlockActivity(), "No media controller to release when disconnected from media service", Toast.LENGTH_SHORT).show();
 616                 }
 617                 mMediaServiceBinder = null;
 618                 mMediaServiceConnection = null;
 619             }
 620         }
 621     }
 622
 623
 624
 625     /**
 626      * Opens the previewed file with an external application.
 627      */
 628     private void openFile() {
 629         stopPreview(true);
 630         mContainerActivity.getFileOperationsHelper().openFile(getFile());
 631         finish();
 632     }
 633
 634     /**
 635      * Starts a the removal of the previewed file.
 636      *
 637      * Shows a confirmation dialog. The action continues in {@link #onConfirmation(String)} , {@link #onNeutral(String)} or {@link #onCancel(String)},
 638      * depending upon the user selection in the dialog.
 639      */
 640     private void removeFile() {
 641         ConfirmationDialogFragment confDialog = ConfirmationDialogFragment.newInstance(
 642                 R.string.confirmation_remove_alert,
 643                 new String[]{getFile().getFileName()},
 644                 R.string.confirmation_remove_remote_and_local,
 645                 R.string.confirmation_remove_local,
 646                 R.string.common_cancel);
 647         confDialog.setOnConfirmationListener(this);
 648         confDialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 649     }
 650
 651
 652     /**
 653      * Performs the removal of the previewed file, both locally and in the server.
 654      */
 655     @Override
 656     public void onConfirmation(String callerTag) {
 657         OCFile file = getFile();
 658         FileDataStorageManager storageManager = mContainerActivity.getStorageManager();
 659         if (storageManager.getFileById(file.getFileId()) != null) {   // check that the file is still there;
 660             stopPreview(true);
 661             mContainerActivity.getFileOperationsHelper().removeFile(file, true);
 662         }
 663     }
 664
 665
 666     /**
 667      * Removes the file from local storage
 668      */
 669     @Override
 670     public void onNeutral(String callerTag) {
 671         OCFile file = getFile();
 672         stopPreview(true);
 673         mContainerActivity.getStorageManager().removeFile(file, false, true);    // TODO perform in background task / new thread
 674         finish();
 675     }
 676
 677     /**
 678      * User cancelled the removal action.
 679      */
 680     @Override
 681     public void onCancel(String callerTag) {
 682         // nothing to do here
 683     }
 684
 685
 686     /**
 687      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewMediaFragment} to be previewed.
 688      *
 689      * @param file      File to test if can be previewed.
 690      * @return          'True' if the file can be handled by the fragment.
 691      */
 692     public static boolean canBePreviewed(OCFile file) {
 693         return (file != null && (file.isAudio() || file.isVideo()));
 694     }
 695
 696
 697     private void stopPreview(boolean stopAudio) {
 698         OCFile file = getFile();
 699         if (file.isAudio() && stopAudio) {
 700             mMediaServiceBinder.pause();
 701
 702         } else if (file.isVideo()) {
 703             mVideoPreview.stopPlayback();
 704         }
 705     }
 706
 707
 708
 709     /**
 710      * Finishes the preview
 711      */
 712     private void finish() {
 713         getSherlockActivity().onBackPressed();
 714     }
 715
 716
 717     public int getPosition() {
 718         if (mPrepared) {
 719             mSavedPlaybackPosition = mVideoPreview.getCurrentPosition();
 720         }
 721         Log_OC.e(TAG, "getting position: " + mSavedPlaybackPosition);
 722         return mSavedPlaybackPosition;
 723     }
 724
 725     public boolean isPlaying() {
 726         if (mPrepared) {
 727             mAutoplay = mVideoPreview.isPlaying();
 728         }
 729         return mAutoplay;
 730     }
 731
 732 }