src/com/owncloud/android/ui/preview/PreviewImageFragment.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.io.File;
  20 import java.lang.ref.WeakReference;
  21 import java.util.ArrayList;
  22 import java.util.List;
  23
  24 import android.accounts.Account;
  25 import android.annotation.SuppressLint;
  26 import android.app.Activity;
  27 import android.content.ActivityNotFoundException;
  28 import android.content.Intent;
  29 import android.graphics.Bitmap;
  30 import android.graphics.BitmapFactory;
  31 import android.graphics.BitmapFactory.Options;
  32 import android.graphics.Point;
  33 import android.media.MediaScannerConnection;
  34 import android.net.Uri;
  35 import android.os.AsyncTask;
  36 import android.os.Bundle;
  37 import android.os.Handler;
  38 import android.support.v4.app.FragmentStatePagerAdapter;
  39 import android.view.Display;
  40 import android.view.LayoutInflater;
  41 import android.view.View;
  42 import android.view.View.OnTouchListener;
  43 import android.view.ViewGroup;
  44 import android.webkit.MimeTypeMap;
  45 import android.widget.ImageView;
  46 import android.widget.ProgressBar;
  47 import android.widget.TextView;
  48 import android.widget.Toast;
  49
  50 import com.actionbarsherlock.view.Menu;
  51 import com.actionbarsherlock.view.MenuInflater;
  52 import com.actionbarsherlock.view.MenuItem;
  53 import com.owncloud.android.Log_OC;
  54 import com.owncloud.android.R;
  55 import com.owncloud.android.datamodel.FileDataStorageManager;
  56 import com.owncloud.android.datamodel.OCFile;
  57 import com.owncloud.android.operations.OnRemoteOperationListener;
  58 import com.owncloud.android.operations.RemoteOperation;
  59 import com.owncloud.android.operations.RemoteOperationResult;
  60 import com.owncloud.android.operations.RemoveFileOperation;
  61 import com.owncloud.android.ui.fragment.ConfirmationDialogFragment;
  62 import com.owncloud.android.ui.fragment.FileFragment;
  63
  64 import eu.alefzero.webdav.WebdavUtils;
  65
  66
  67 /**
  68  * This fragment shows a preview of a downloaded image.
  69  *
  70  * Trying to get an instance with NULL {@link OCFile} or ownCloud {@link Account} values will produce an {@link IllegalStateException}.
  71  *
  72  * If the {@link OCFile} passed is not downloaded, an {@link IllegalStateException} is generated on instantiation too.
  73  *
  74  * @author David A. Velasco
  75  */
  76 public class PreviewImageFragment extends FileFragment implements   OnRemoteOperationListener,
  77                                                                         ConfirmationDialogFragment.ConfirmationDialogFragmentListener {
  78     public static final String EXTRA_FILE = "FILE";
  79     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  80
  81     private View mView;
  82     private Account mAccount;
  83     private FileDataStorageManager mStorageManager;
  84     private ImageView mImageView;
  85     private TextView mMessageView;
  86     private ProgressBar mProgressWheel;
  87
  88     public Bitmap mBitmap = null;
  89
  90     private Handler mHandler;
  91     private RemoteOperation mLastRemoteOperation;
  92
  93     private static final String TAG = PreviewImageFragment.class.getSimpleName();
  94
  95     private boolean mIgnoreFirstSavedState;
  96
  97
  98     /**
  99      * Creates a fragment to preview an image.
 100      *
 101      * When 'imageFile' or 'ocAccount' are null
 102      *
 103      * @param imageFile                 An {@link OCFile} to preview as an image in the fragment
 104      * @param ocAccount                 An ownCloud account; needed to start downloads
 105      * @param ignoreFirstSavedState     Flag to work around an unexpected behaviour of {@link FragmentStatePagerAdapter}; TODO better solution
 106      */
 107     public PreviewImageFragment(OCFile fileToDetail, Account ocAccount, boolean ignoreFirstSavedState) {
 108         super(fileToDetail);
 109         mAccount = ocAccount;
 110         mStorageManager = null; // we need a context to init this; the container activity is not available yet at this moment
 111         mIgnoreFirstSavedState = ignoreFirstSavedState;
 112     }
 113
 114
 115     /**
 116      *  Creates an empty fragment for image previews.
 117      *
 118      *  MUST BE KEPT: the system uses it when tries to reinstantiate a fragment automatically (for instance, when the device is turned a aside).
 119      *
 120      *  DO NOT CALL IT: an {@link OCFile} and {@link Account} must be provided for a successful construction
 121      */
 122     public PreviewImageFragment() {
 123         super();
 124         mAccount = null;
 125         mStorageManager = null;
 126         mIgnoreFirstSavedState = false;
 127     }
 128
 129
 130     /**
 131      * {@inheritDoc}
 132      */
 133     @Override
 134     public void onCreate(Bundle savedInstanceState) {
 135         super.onCreate(savedInstanceState);
 136         mHandler = new Handler();
 137         setHasOptionsMenu(true);
 138     }
 139
 140
 141     /**
 142      * {@inheritDoc}
 143      */
 144     @Override
 145     public View onCreateView(LayoutInflater inflater, ViewGroup container,
 146             Bundle savedInstanceState) {
 147         super.onCreateView(inflater, container, savedInstanceState);
 148         mView = inflater.inflate(R.layout.preview_image_fragment, container, false);
 149         mImageView = (ImageView)mView.findViewById(R.id.image);
 150         mImageView.setVisibility(View.GONE);
 151         mView.setOnTouchListener((OnTouchListener)getActivity());   // WATCH OUT THAT CAST
 152         mMessageView = (TextView)mView.findViewById(R.id.message);
 153         mMessageView.setVisibility(View.GONE);
 154         mProgressWheel = (ProgressBar)mView.findViewById(R.id.progressWheel);
 155         mProgressWheel.setVisibility(View.VISIBLE);
 156         return mView;
 157     }
 158
 159
 160     /**
 161      * {@inheritDoc}
 162      */
 163     @Override
 164     public void onAttach(Activity activity) {
 165         super.onAttach(activity);
 166         if (!(activity instanceof FileFragment.ContainerActivity))
 167             throw new ClassCastException(activity.toString() + " must implement " + FileFragment.ContainerActivity.class.getSimpleName());
 168     }
 169
 170
 171     /**
 172      * {@inheritDoc}
 173      */
 174     @Override
 175     public void onActivityCreated(Bundle savedInstanceState) {
 176         super.onActivityCreated(savedInstanceState);
 177         mStorageManager = new FileDataStorageManager(mAccount, getActivity().getApplicationContext().getContentResolver());
 178         if (savedInstanceState != null) {
 179             if (!mIgnoreFirstSavedState) {
 180                 setFile((OCFile)savedInstanceState.getParcelable(PreviewImageFragment.EXTRA_FILE));
 181                 mAccount = savedInstanceState.getParcelable(PreviewImageFragment.EXTRA_ACCOUNT);
 182             } else {
 183                 mIgnoreFirstSavedState = false;
 184             }
 185         }
 186         if (getFile() == null) {
 187             throw new IllegalStateException("Instanced with a NULL OCFile");
 188         }
 189         if (mAccount == null) {
 190             throw new IllegalStateException("Instanced with a NULL ownCloud Account");
 191         }
 192         if (!getFile().isDown()) {
 193             throw new IllegalStateException("There is no local file to preview");
 194         }
 195     }
 196
 197
 198     /**
 199      * {@inheritDoc}
 200      */
 201     @Override
 202     public void onSaveInstanceState(Bundle outState) {
 203         super.onSaveInstanceState(outState);
 204         outState.putParcelable(PreviewImageFragment.EXTRA_FILE, getFile());
 205         outState.putParcelable(PreviewImageFragment.EXTRA_ACCOUNT, mAccount);
 206     }
 207
 208
 209     @Override
 210     public void onStart() {
 211         super.onStart();
 212         if (getFile() != null) {
 213            BitmapLoader bl = new BitmapLoader(mImageView, mMessageView, mProgressWheel);
 214            bl.execute(new String[]{getFile().getStoragePath()});
 215         }
 216     }
 217
 218
 219     /**
 220      * {@inheritDoc}
 221      */
 222     @Override
 223     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 224         super.onCreateOptionsMenu(menu, inflater);
 225
 226         inflater.inflate(R.menu.file_actions_menu, menu);
 227         List<Integer> toHide = new ArrayList<Integer>();
 228
 229         MenuItem item = null;
 230         toHide.add(R.id.action_cancel_download);
 231         toHide.add(R.id.action_cancel_upload);
 232         toHide.add(R.id.action_download_file);
 233         toHide.add(R.id.action_rename_file);    // by now
 234
 235         for (int i : toHide) {
 236             item = menu.findItem(i);
 237             if (item != null) {
 238                 item.setVisible(false);
 239                 item.setEnabled(false);
 240             }
 241         }
 242
 243     }
 244
 245
 246     /**
 247      * {@inheritDoc}
 248      */
 249     @Override
 250     public boolean onOptionsItemSelected(MenuItem item) {
 251         switch (item.getItemId()) {
 252             case R.id.action_open_file_with: {
 253                 openFile();
 254                 return true;
 255             }
 256             case R.id.action_remove_file: {
 257                 removeFile();
 258                 return true;
 259             }
 260             case R.id.action_see_details: {
 261                 seeDetails();
 262                 return true;
 263             }
 264
 265             default:
 266                 return false;
 267         }
 268     }
 269
 270
 271     private void seeDetails() {
 272         ((FileFragment.ContainerActivity)getActivity()).showDetails(getFile());
 273     }
 274
 275
 276     @Override
 277     public void onResume() {
 278         super.onResume();
 279     }
 280
 281
 282     @Override
 283     public void onPause() {
 284         super.onPause();
 285     }
 286
 287
 288     @Override
 289     public void onDestroy() {
 290         super.onDestroy();
 291         if (mBitmap != null) {
 292             mBitmap.recycle();
 293         }
 294     }
 295
 296
 297     /**
 298      * Opens the previewed image with an external application.
 299      *
 300      * TODO - improve this; instead of prioritize the actions available for the MIME type in the server,
 301      * we should get a list of available apps for MIME tpye in the server and join it with the list of
 302      * available apps for the MIME type known from the file extension, to let the user choose
 303      */
 304     private void openFile() {
 305         OCFile file = getFile();
 306         String storagePath = file.getStoragePath();
 307         String encodedStoragePath = WebdavUtils.encodePath(storagePath);
 308         try {
 309             Intent i = new Intent(Intent.ACTION_VIEW);
 310             i.setDataAndType(Uri.parse("file://"+ encodedStoragePath), file.getMimetype());
 311             i.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
 312             startActivity(i);
 313
 314         } catch (Throwable t) {
 315             Log_OC.e(TAG, "Fail when trying to open with the mimeType provided from the ownCloud server: " + file.getMimetype());
 316             boolean toastIt = true;
 317             String mimeType = "";
 318             try {
 319                 Intent i = new Intent(Intent.ACTION_VIEW);
 320                 mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(storagePath.substring(storagePath.lastIndexOf('.') + 1));
 321                 if (mimeType == null || !mimeType.equals(file.getMimetype())) {
 322                     if (mimeType != null) {
 323                         i.setDataAndType(Uri.parse("file://"+ encodedStoragePath), mimeType);
 324                     } else {
 325                         // desperate try
 326                         i.setDataAndType(Uri.parse("file://"+ encodedStoragePath), "*-/*");
 327                     }
 328                     i.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
 329                     startActivity(i);
 330                     toastIt = false;
 331                 }
 332
 333             } catch (IndexOutOfBoundsException e) {
 334                 Log_OC.e(TAG, "Trying to find out MIME type of a file without extension: " + storagePath);
 335
 336             } catch (ActivityNotFoundException e) {
 337                 Log_OC.e(TAG, "No activity found to handle: " + storagePath + " with MIME type " + mimeType + " obtained from extension");
 338
 339             } catch (Throwable th) {
 340                 Log_OC.e(TAG, "Unexpected problem when opening: " + storagePath, th);
 341
 342             } finally {
 343                 if (toastIt) {
 344                     Toast.makeText(getActivity(), "There is no application to handle file " + file.getFileName(), Toast.LENGTH_SHORT).show();
 345                 }
 346             }
 347
 348         }
 349         finish();
 350     }
 351
 352
 353     /**
 354      * Starts a the removal of the previewed file.
 355      *
 356      * Shows a confirmation dialog. The action continues in {@link #onConfirmation(String)} , {@link #onNeutral(String)} or {@link #onCancel(String)},
 357      * depending upon the user selection in the dialog.
 358      */
 359     private void removeFile() {
 360         ConfirmationDialogFragment confDialog = ConfirmationDialogFragment.newInstance(
 361                 R.string.confirmation_remove_alert,
 362                 new String[]{getFile().getFileName()},
 363                 R.string.confirmation_remove_remote_and_local,
 364                 R.string.confirmation_remove_local,
 365                 R.string.common_cancel);
 366         confDialog.setOnConfirmationListener(this);
 367         confDialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 368     }
 369
 370
 371     /**
 372      * Performs the removal of the previewed file, both locally and in the server.
 373      */
 374     @Override
 375     public void onConfirmation(String callerTag) {
 376         if (mStorageManager.getFileById(getFile().getFileId()) != null) {   // check that the file is still there;
 377             String path = new File(getFile().getStoragePath()).getParent();
 378             mLastRemoteOperation = new RemoveFileOperation( getFile(),      // TODO we need to review the interface with RemoteOperations, and use OCFile IDs instead of OCFile objects as parameters
 379                                                             true,
 380                                                             mStorageManager);
 381             mLastRemoteOperation.execute(mAccount, getSherlockActivity(), this, mHandler, getSherlockActivity());
 382
 383             ((PreviewImageActivity) getActivity()).showLoadingDialog();
 384
 385             triggerMediaScan(path);
 386         }
 387     }
 388
 389
 390     /**
 391      * Removes the file from local storage
 392      */
 393     @Override
 394     public void onNeutral(String callerTag) {
 395         // TODO this code should be made in a secondary thread,
 396         OCFile file = getFile();
 397         if (file.isDown()) {   // checks it is still there
 398             File f = new File(file.getStoragePath());
 399             String path = f.getParent();
 400             f.delete();
 401
 402             triggerMediaScan(path);
 403
 404             file.setStoragePath(null);
 405             mStorageManager.saveFile(file);
 406             finish();
 407         }
 408     }
 409
 410     /**
 411      * User cancelled the removal action.
 412      */
 413     @Override
 414     public void onCancel(String callerTag) {
 415         // nothing to do here
 416     }
 417
 418     private void triggerMediaScan(String path){
 419         MediaScannerConnection.scanFile(
 420                 getActivity().getApplicationContext(),
 421                 new String[]{path},
 422                 null,null);
 423     }
 424
 425
 426     private class BitmapLoader extends AsyncTask<String, Void, Bitmap> {
 427
 428         /**
 429          * Weak reference to the target {@link ImageView} where the bitmap will be loaded into.
 430          *
 431          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 432          */
 433         private final WeakReference<ImageView> mImageViewRef;
 434
 435         /**
 436          * Weak reference to the target {@link TextView} where error messages will be written.
 437          *
 438          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 439          */
 440         private final WeakReference<TextView> mMessageViewRef;
 441
 442
 443         /**
 444          * Weak reference to the target {@link Progressbar} shown while the load is in progress.
 445          *
 446          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 447          */
 448         private final WeakReference<ProgressBar> mProgressWheelRef;
 449
 450
 451         /**
 452          * Error message to show when a load fails
 453          */
 454         private int mErrorMessageId;
 455
 456
 457         /**
 458          * Constructor.
 459          *
 460          * @param imageView     Target {@link ImageView} where the bitmap will be loaded into.
 461          */
 462         public BitmapLoader(ImageView imageView, TextView messageView, ProgressBar progressWheel) {
 463             mImageViewRef = new WeakReference<ImageView>(imageView);
 464             mMessageViewRef = new WeakReference<TextView>(messageView);
 465             mProgressWheelRef = new WeakReference<ProgressBar>(progressWheel);
 466         }
 467
 468
 469         @SuppressWarnings("deprecation")
 470         @SuppressLint({ "NewApi", "NewApi", "NewApi" }) // to avoid Lint errors since Android SDK r20
 471                 @Override
 472         protected Bitmap doInBackground(String... params) {
 473             Bitmap result = null;
 474             if (params.length != 1) return result;
 475             String storagePath = params[0];
 476             try {
 477                 // set desired options that will affect the size of the bitmap
 478                 BitmapFactory.Options options = new Options();
 479                 options.inScaled = true;
 480                 options.inPurgeable = true;
 481                 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
 482                     options.inPreferQualityOverSpeed = false;
 483                 }
 484                 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
 485                     options.inMutable = false;
 486                 }
 487                 // make a false load of the bitmap - just to be able to read outWidth, outHeight and outMimeType
 488                 options.inJustDecodeBounds = true;
 489                 BitmapFactory.decodeFile(storagePath, options);
 490
 491                 int width = options.outWidth;
 492                 int height = options.outHeight;
 493                 int scale = 1;
 494
 495                 Display display = getActivity().getWindowManager().getDefaultDisplay();
 496                 Point size = new Point();
 497                 int screenWidth;
 498                 int screenHeight;
 499                 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB_MR2) {
 500                     display.getSize(size);
 501                     screenWidth = size.x;
 502                     screenHeight = size.y;
 503                 } else {
 504                     screenWidth = display.getWidth();
 505                     screenHeight = display.getHeight();
 506                 }
 507
 508                 if (width > screenWidth) {
 509                     // second try to scale down the image , this time depending upon the screen size
 510                     scale = (int) Math.floor((float)width / screenWidth);
 511                 }
 512                 if (height > screenHeight) {
 513                     scale = Math.max(scale, (int) Math.floor((float)height / screenHeight));
 514                 }
 515                 options.inSampleSize = scale;
 516
 517                 // really load the bitmap
 518                 options.inJustDecodeBounds = false; // the next decodeFile call will be real
 519                 result = BitmapFactory.decodeFile(storagePath, options);
 520                 //Log_OC.d(TAG, "Image loaded - width: " + options.outWidth + ", loaded height: " + options.outHeight);
 521
 522                 if (result == null) {
 523                     mErrorMessageId = R.string.preview_image_error_unknown_format;
 524                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);
 525                 }
 526
 527             } catch (OutOfMemoryError e) {
 528                 mErrorMessageId = R.string.preview_image_error_unknown_format;
 529                 Log_OC.e(TAG, "Out of memory occured for file " + storagePath, e);
 530
 531             } catch (NoSuchFieldError e) {
 532                 mErrorMessageId = R.string.common_error_unknown;
 533                 Log_OC.e(TAG, "Error from access to unexisting field despite protection; file " + storagePath, e);
 534
 535             } catch (Throwable t) {
 536                 mErrorMessageId = R.string.common_error_unknown;
 537                 Log_OC.e(TAG, "Unexpected error loading " + getFile().getStoragePath(), t);
 538
 539             }
 540             return result;
 541         }
 542
 543         @Override
 544         protected void onPostExecute(Bitmap result) {
 545             hideProgressWheel();
 546             if (result != null) {
 547                 showLoadedImage(result);
 548             } else {
 549                 showErrorMessage();
 550             }
 551         }
 552
 553         private void showLoadedImage(Bitmap result) {
 554             if (mImageViewRef != null) {
 555                 final ImageView imageView = mImageViewRef.get();
 556                 if (imageView != null) {
 557                     imageView.setImageBitmap(result);
 558                     imageView.setVisibility(View.VISIBLE);
 559                     mBitmap  = result;
 560                 } // else , silently finish, the fragment was destroyed
 561             }
 562             if (mMessageViewRef != null) {
 563                 final TextView messageView = mMessageViewRef.get();
 564                 if (messageView != null) {
 565                     messageView.setVisibility(View.GONE);
 566                 } // else , silently finish, the fragment was destroyed
 567             }
 568         }
 569
 570         private void showErrorMessage() {
 571             if (mImageViewRef != null) {
 572                 final ImageView imageView = mImageViewRef.get();
 573                 if (imageView != null) {
 574                     // shows the default error icon
 575                     imageView.setVisibility(View.VISIBLE);
 576                 } // else , silently finish, the fragment was destroyed
 577             }
 578             if (mMessageViewRef != null) {
 579                 final TextView messageView = mMessageViewRef.get();
 580                 if (messageView != null) {
 581                     messageView.setText(mErrorMessageId);
 582                     messageView.setVisibility(View.VISIBLE);
 583                 } // else , silently finish, the fragment was destroyed
 584             }
 585         }
 586
 587         private void hideProgressWheel() {
 588             if (mProgressWheelRef != null) {
 589                 final ProgressBar progressWheel = mProgressWheelRef.get();
 590                 if (progressWheel != null) {
 591                     progressWheel.setVisibility(View.GONE);
 592                 }
 593             }
 594         }
 595
 596     }
 597
 598     /**
 599      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewImageFragment} to be previewed.
 600      *
 601      * @param file      File to test if can be previewed.
 602      * @return          'True' if the file can be handled by the fragment.
 603      */
 604     public static boolean canBePreviewed(OCFile file) {
 605         return (file != null && file.isImage());
 606     }
 607
 608
 609     /**
 610      * {@inheritDoc}
 611      */
 612     @Override
 613     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 614         if (operation.equals(mLastRemoteOperation) && operation instanceof RemoveFileOperation) {
 615             onRemoveFileOperationFinish((RemoveFileOperation)operation, result);
 616         }
 617     }
 618
 619     private void onRemoveFileOperationFinish(RemoveFileOperation operation, RemoteOperationResult result) {
 620         ((PreviewImageActivity) getActivity()).dismissLoadingDialog();
 621
 622         if (result.isSuccess()) {
 623             Toast msg = Toast.makeText(getActivity().getApplicationContext(), R.string.remove_success_msg, Toast.LENGTH_LONG);
 624             msg.show();
 625             finish();
 626
 627         } else {
 628             Toast msg = Toast.makeText(getActivity(), R.string.remove_fail_msg, Toast.LENGTH_LONG);
 629             msg.show();
 630             if (result.isSslRecoverableException()) {
 631                 // TODO show the SSL warning dialog
 632             }
 633         }
 634     }
 635
 636     /**
 637      * Finishes the preview
 638      */
 639     private void finish() {
 640         Activity container = getActivity();
 641         container.finish();
 642     }
 643
 644
 645 }