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

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2014 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.BufferedInputStream;
  20 import java.io.File;
  21 import java.io.FileInputStream;
  22 import java.io.FilterInputStream;
  23 import java.io.IOException;
  24 import java.io.InputStream;
  25 import java.lang.ref.WeakReference;
  26
  27 import android.accounts.Account;
  28 import android.annotation.SuppressLint;
  29 import android.app.Activity;
  30 import android.graphics.Bitmap;
  31 import android.graphics.BitmapFactory;
  32 import android.graphics.BitmapFactory.Options;
  33 import android.graphics.Point;
  34 import android.os.AsyncTask;
  35 import android.os.Bundle;
  36 import android.support.v4.app.FragmentStatePagerAdapter;
  37 import android.view.Display;
  38 import android.view.LayoutInflater;
  39 import android.view.View;
  40 import android.view.View.OnClickListener;
  41 import android.view.ViewGroup;
  42 import android.widget.ImageView;
  43 import android.widget.ProgressBar;
  44 import android.widget.TextView;
  45
  46 import com.actionbarsherlock.view.Menu;
  47 import com.actionbarsherlock.view.MenuInflater;
  48 import com.actionbarsherlock.view.MenuItem;
  49 import com.owncloud.android.R;
  50 import com.owncloud.android.datamodel.OCFile;
  51 import com.owncloud.android.files.FileMenuFilter;
  52 import com.owncloud.android.lib.common.utils.Log_OC;
  53 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
  54 import com.owncloud.android.ui.dialog.RemoveFileDialogFragment;
  55 import com.owncloud.android.ui.fragment.FileFragment;
  56 import com.owncloud.android.utils.BitmapUtils;
  57 import com.owncloud.android.utils.TouchImageViewCustom;
  58
  59
  60
  61 /**
  62  * This fragment shows a preview of a downloaded image.
  63  *
  64  * Trying to get an instance with NULL {@link OCFile} or ownCloud {@link Account} values will produce an {@link IllegalStateException}.
  65  *
  66  * If the {@link OCFile} passed is not downloaded, an {@link IllegalStateException} is generated on instantiation too.
  67  *
  68  * @author David A. Velasco
  69  */
  70 public class PreviewImageFragment extends FileFragment {
  71
  72     public static final String EXTRA_FILE = "FILE";
  73     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  74
  75     private View mView;
  76     private Account mAccount;
  77     private TouchImageViewCustom mImageView;
  78     private TextView mMessageView;
  79     private ProgressBar mProgressWheel;
  80
  81     public Bitmap mBitmap = null;
  82
  83     private static final String TAG = PreviewImageFragment.class.getSimpleName();
  84
  85     private boolean mIgnoreFirstSavedState;
  86
  87     private LoadBitmapTask mLoadBitmapTask = null;
  88
  89
  90     /**
  91      * Creates a fragment to preview an image.
  92      *
  93      * When 'imageFile' or 'ocAccount' are null
  94      *
  95      * @param imageFile                 An {@link OCFile} to preview as an image in the fragment
  96      * @param ocAccount                 An ownCloud account; needed to start downloads
  97      * @param ignoreFirstSavedState     Flag to work around an unexpected behaviour of {@link FragmentStatePagerAdapter}; TODO better solution
  98      */
  99     public PreviewImageFragment(OCFile fileToDetail, Account ocAccount, boolean ignoreFirstSavedState) {
 100         super(fileToDetail);
 101         mAccount = ocAccount;
 102         mIgnoreFirstSavedState = ignoreFirstSavedState;
 103     }
 104
 105
 106     /**
 107      *  Creates an empty fragment for image previews.
 108      *
 109      *  MUST BE KEPT: the system uses it when tries to reinstantiate a fragment automatically (for instance, when the device is turned a aside).
 110      *
 111      *  DO NOT CALL IT: an {@link OCFile} and {@link Account} must be provided for a successful construction
 112      */
 113     public PreviewImageFragment() {
 114         super();
 115         mAccount = null;
 116         mIgnoreFirstSavedState = false;
 117     }
 118
 119
 120     /**
 121      * {@inheritDoc}
 122      */
 123     @Override
 124     public void onCreate(Bundle savedInstanceState) {
 125         super.onCreate(savedInstanceState);
 126         setHasOptionsMenu(true);
 127     }
 128
 129
 130     /**
 131      * {@inheritDoc}
 132      */
 133     @Override
 134     public View onCreateView(LayoutInflater inflater, ViewGroup container,
 135             Bundle savedInstanceState) {
 136         super.onCreateView(inflater, container, savedInstanceState);
 137         mView = inflater.inflate(R.layout.preview_image_fragment, container, false);
 138         mImageView = (TouchImageViewCustom) mView.findViewById(R.id.image);
 139         mImageView.setVisibility(View.GONE);
 140         mImageView.setOnClickListener(new OnClickListener() {
 141             @Override
 142             public void onClick(View v) {
 143                 ((PreviewImageActivity) getActivity()).toggleFullScreen();
 144             }
 145
 146         });
 147         mMessageView = (TextView)mView.findViewById(R.id.message);
 148         mMessageView.setVisibility(View.GONE);
 149         mProgressWheel = (ProgressBar)mView.findViewById(R.id.progressWheel);
 150         mProgressWheel.setVisibility(View.VISIBLE);
 151         return mView;
 152     }
 153
 154     /**
 155      * {@inheritDoc}
 156      */
 157     @Override
 158     public void onActivityCreated(Bundle savedInstanceState) {
 159         super.onActivityCreated(savedInstanceState);
 160         if (savedInstanceState != null) {
 161             if (!mIgnoreFirstSavedState) {
 162                 OCFile file = (OCFile)savedInstanceState.getParcelable(PreviewImageFragment.EXTRA_FILE);
 163                 setFile(file);
 164                 mAccount = savedInstanceState.getParcelable(PreviewImageFragment.EXTRA_ACCOUNT);
 165             } else {
 166                 mIgnoreFirstSavedState = false;
 167             }
 168         }
 169         if (getFile() == null) {
 170             throw new IllegalStateException("Instanced with a NULL OCFile");
 171         }
 172         if (mAccount == null) {
 173             throw new IllegalStateException("Instanced with a NULL ownCloud Account");
 174         }
 175         if (!getFile().isDown()) {
 176             throw new IllegalStateException("There is no local file to preview");
 177         }
 178     }
 179
 180
 181     /**
 182      * {@inheritDoc}
 183      */
 184     @Override
 185     public void onSaveInstanceState(Bundle outState) {
 186         super.onSaveInstanceState(outState);
 187         outState.putParcelable(PreviewImageFragment.EXTRA_FILE, getFile());
 188         outState.putParcelable(PreviewImageFragment.EXTRA_ACCOUNT, mAccount);
 189     }
 190
 191
 192     @Override
 193     public void onStart() {
 194         super.onStart();
 195         if (getFile() != null) {
 196            mLoadBitmapTask = new LoadBitmapTask(mImageView, mMessageView, mProgressWheel);
 197            mLoadBitmapTask.execute(new String[]{getFile().getStoragePath()});
 198         }
 199     }
 200
 201
 202     @Override
 203     public void onStop() {
 204         super.onStop();
 205         if (mLoadBitmapTask != null) {
 206             mLoadBitmapTask.cancel(true);
 207             mLoadBitmapTask = null;
 208         }
 209
 210     }
 211
 212     /**
 213      * {@inheritDoc}
 214      */
 215     @Override
 216     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 217         super.onCreateOptionsMenu(menu, inflater);
 218         inflater.inflate(R.menu.file_actions_menu, menu);
 219     }
 220
 221     /**
 222      * {@inheritDoc}
 223      */
 224     @Override
 225     public void onPrepareOptionsMenu(Menu menu) {
 226         super.onPrepareOptionsMenu(menu);
 227
 228         if (mContainerActivity.getStorageManager() != null) {
 229             // Update the file
 230             setFile(mContainerActivity.getStorageManager().getFileById(getFile().getFileId()));
 231
 232             FileMenuFilter mf = new FileMenuFilter(
 233                 getFile(),
 234                 mContainerActivity.getStorageManager().getAccount(),
 235                 getSherlockActivity()
 236             );
 237             mf.filter(menu);
 238         }
 239
 240         // additional restriction for this fragment
 241         // TODO allow renaming in PreviewImageFragment
 242         MenuItem item = menu.findItem(R.id.action_rename_file);
 243         if (item != null) {
 244             item.setVisible(false);
 245             item.setEnabled(false);
 246         }
 247
 248         // additional restriction for this fragment
 249         // TODO allow refresh file in PreviewImageFragment
 250         item = menu.findItem(R.id.action_sync_file);
 251         if (item != null) {
 252             item.setVisible(false);
 253             item.setEnabled(false);
 254         }
 255
 256         // additional restriction for this fragment
 257         item = menu.findItem(R.id.action_move);
 258         if (item != null) {
 259             item.setVisible(false);
 260             item.setEnabled(false);
 261         }
 262
 263     }
 264
 265
 266
 267     /**
 268      * {@inheritDoc}
 269      */
 270     @Override
 271     public boolean onOptionsItemSelected(MenuItem item) {
 272         switch (item.getItemId()) {
 273             case R.id.action_share_file: {
 274                 mContainerActivity.getFileOperationsHelper().shareFileWithLink(getFile());
 275                 return true;
 276             }
 277             case R.id.action_unshare_file: {
 278                 mContainerActivity.getFileOperationsHelper().unshareFileWithLink(getFile());
 279                 return true;
 280             }
 281             case R.id.action_open_file_with: {
 282                 openFile();
 283                 return true;
 284             }
 285             case R.id.action_remove_file: {
 286                 RemoveFileDialogFragment dialog = RemoveFileDialogFragment.newInstance(getFile());
 287                 dialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 288                 return true;
 289             }
 290             case R.id.action_see_details: {
 291                 seeDetails();
 292                 return true;
 293             }
 294             case R.id.action_send_file: {
 295                 mContainerActivity.getFileOperationsHelper().sendDownloadedFile(getFile());
 296                 return true;
 297             }
 298             case R.id.action_sync_file: {
 299                 mContainerActivity.getFileOperationsHelper().syncFile(getFile());
 300                 return true;
 301             }
 302
 303             default:
 304                 return false;
 305         }
 306     }
 307
 308
 309     private void seeDetails() {
 310         mContainerActivity.showDetails(getFile());
 311     }
 312
 313
 314     @Override
 315     public void onResume() {
 316         super.onResume();
 317     }
 318
 319
 320     @Override
 321     public void onPause() {
 322         super.onPause();
 323     }
 324
 325     @Override
 326     public void onDestroy() {
 327         if (mBitmap != null) {
 328             mBitmap.recycle();
 329             System.gc();
 330         }
 331         super.onDestroy();
 332     }
 333
 334
 335     /**
 336      * Opens the previewed image with an external application.
 337      */
 338     private void openFile() {
 339         mContainerActivity.getFileOperationsHelper().openFile(getFile());
 340         finish();
 341     }
 342
 343
 344     private class LoadBitmapTask extends AsyncTask<String, Void, Bitmap> {
 345
 346         /**
 347          * Weak reference to the target {@link ImageView} where the bitmap will be loaded into.
 348          *
 349          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 350          */
 351         private final WeakReference<ImageViewCustom> mImageViewRef;
 352
 353         /**
 354          * Weak reference to the target {@link TextView} where error messages will be written.
 355          *
 356          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 357          */
 358         private final WeakReference<TextView> mMessageViewRef;
 359
 360
 361         /**
 362          * Weak reference to the target {@link Progressbar} shown while the load is in progress.
 363          *
 364          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 365          */
 366         private final WeakReference<ProgressBar> mProgressWheelRef;
 367
 368
 369         /**
 370          * Error message to show when a load fails
 371          */
 372         private int mErrorMessageId;
 373
 374
 375         /**
 376          * Constructor.
 377          *
 378          * @param imageView     Target {@link ImageView} where the bitmap will be loaded into.
 379          */
 380         public LoadBitmapTask(ImageViewCustom imageView, TextView messageView, ProgressBar progressWheel) {
 381             mImageViewRef = new WeakReference<ImageViewCustom>(imageView);
 382             mMessageViewRef = new WeakReference<TextView>(messageView);
 383             mProgressWheelRef = new WeakReference<ProgressBar>(progressWheel);
 384         }
 385
 386
 387         @Override
 388         protected Bitmap doInBackground(String... params) {
 389             Bitmap result = null;
 390             if (params.length != 1) return result;
 391             String storagePath = params[0];
 392             try {
 393
 394                 if (isCancelled()) return result;
 395
 396                 File picture = new File(storagePath);
 397
 398                 if (picture != null) {
 399                     // Decode file into a bitmap in real size for being able to make zoom on
 400                     // the image
 401                     result = BitmapFactory.decodeStream(new FlushedInputStream
 402                             (new BufferedInputStream(new FileInputStream(picture))));
 403                 }
 404
 405                 if (isCancelled()) return result;
 406
 407                 if (result == null) {
 408                     mErrorMessageId = R.string.preview_image_error_unknown_format;
 409                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);
 410                 } else {
 411                     // Rotate image, obeying exif tag.
 412                     result = BitmapUtils.rotateImage(result, storagePath);
 413                 }
 414
 415             } catch (OutOfMemoryError e) {
 416                 Log_OC.e(TAG, "Out of memory occured for file " + storagePath, e);
 417
 418                 if (isCancelled()) return result;
 419
 420                 // If out of memory error when loading or rotating image, try to load it scaled
 421                 result = loadScaledImage(storagePath);
 422
 423                 if (result == null) {
 424                     mErrorMessageId = R.string.preview_image_error_unknown_format;
 425                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);
 426                 } else {
 427                     // Rotate scaled image, obeying exif tag
 428                     result = BitmapUtils.rotateImage(result, storagePath);
 429                 }
 430
 431             } catch (NoSuchFieldError e) {
 432                 mErrorMessageId = R.string.common_error_unknown;
 433                 Log_OC.e(TAG, "Error from access to unexisting field despite protection; file "
 434                                 + storagePath, e);
 435
 436             } catch (Throwable t) {
 437                 mErrorMessageId = R.string.common_error_unknown;
 438                 Log_OC.e(TAG, "Unexpected error loading " + getFile().getStoragePath(), t);
 439
 440             }
 441
 442             return result;
 443         }
 444
 445         @Override
 446         protected void onCancelled(Bitmap result) {
 447             if (result != null) {
 448                 result.recycle();
 449             }
 450         }
 451
 452         @Override
 453         protected void onPostExecute(Bitmap result) {
 454             hideProgressWheel();
 455             if (result != null) {
 456                 showLoadedImage(result);
 457             } else {
 458                 showErrorMessage();
 459             }
 460         }
 461
 462         @SuppressLint("InlinedApi")
 463         private void showLoadedImage(Bitmap result) {
 464             if (mImageViewRef != null) {
 465                 final ImageViewCustom imageView = mImageViewRef.get();
 466                 if (imageView != null) {
 467                     imageView.setBitmap(result);
 468                     imageView.setImageBitmap(result);
 469                     imageView.setVisibility(View.VISIBLE);
 470                     mBitmap  = result;
 471                 } // else , silently finish, the fragment was destroyed
 472             }
 473             if (mMessageViewRef != null) {
 474                 final TextView messageView = mMessageViewRef.get();
 475                 if (messageView != null) {
 476                     messageView.setVisibility(View.GONE);
 477                 } // else , silently finish, the fragment was destroyed
 478             }
 479         }
 480
 481         private void showErrorMessage() {
 482             if (mImageViewRef != null) {
 483                 final ImageView imageView = mImageViewRef.get();
 484                 if (imageView != null) {
 485                     // shows the default error icon
 486                     imageView.setVisibility(View.VISIBLE);
 487                 } // else , silently finish, the fragment was destroyed
 488             }
 489             if (mMessageViewRef != null) {
 490                 final TextView messageView = mMessageViewRef.get();
 491                 if (messageView != null) {
 492                     messageView.setText(mErrorMessageId);
 493                     messageView.setVisibility(View.VISIBLE);
 494                 } // else , silently finish, the fragment was destroyed
 495             }
 496         }
 497
 498         private void hideProgressWheel() {
 499             if (mProgressWheelRef != null) {
 500                 final ProgressBar progressWheel = mProgressWheelRef.get();
 501                 if (progressWheel != null) {
 502                     progressWheel.setVisibility(View.GONE);
 503                 }
 504             }
 505         }
 506
 507     }
 508
 509     /**
 510      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewImageFragment} to be previewed.
 511      *
 512      * @param file      File to test if can be previewed.
 513      * @return          'True' if the file can be handled by the fragment.
 514      */
 515     public static boolean canBePreviewed(OCFile file) {
 516         return (file != null && file.isImage());
 517     }
 518
 519
 520     /**
 521      * Finishes the preview
 522      */
 523     private void finish() {
 524         Activity container = getActivity();
 525         container.finish();
 526     }
 527
 528     public TouchImageViewCustom getImageView() {
 529         return mImageView;
 530     }
 531
 532     static class FlushedInputStream extends FilterInputStream {
 533         public FlushedInputStream(InputStream inputStream) {
 534         super(inputStream);
 535         }
 536
 537         @Override
 538         public long skip(long n) throws IOException {
 539             long totalBytesSkipped = 0L;
 540             while (totalBytesSkipped < n) {
 541                 long bytesSkipped = in.skip(n - totalBytesSkipped);
 542                 if (bytesSkipped == 0L) {
 543                       int byteValue = read();
 544                       if (byteValue < 0) {
 545                           break;  // we reached EOF
 546                       } else {
 547                           bytesSkipped = 1; // we read one byte
 548                       }
 549                }
 550                totalBytesSkipped += bytesSkipped;
 551             }
 552             return totalBytesSkipped;
 553         }
 554     }
 555
 556     /**
 557      * Load image scaled
 558      * @param storagePath: path of the image
 559      * @return Bitmap
 560      */
 561     @SuppressWarnings("deprecation")
 562     private Bitmap loadScaledImage(String storagePath) {
 563
 564         Log_OC.d(TAG, "Loading image scaled");
 565
 566         // set desired options that will affect the size of the bitmap
 567         BitmapFactory.Options options = new Options();
 568         options.inScaled = true;
 569         options.inPurgeable = true;
 570         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
 571             options.inPreferQualityOverSpeed = false;
 572         }
 573         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
 574             options.inMutable = false;
 575         }
 576         // make a false load of the bitmap - just to be able to read outWidth, outHeight and outMimeType
 577         options.inJustDecodeBounds = true;
 578         BitmapFactory.decodeFile(storagePath, options);
 579
 580         int width = options.outWidth;
 581         int height = options.outHeight;
 582         int scale = 1;
 583
 584         Display display = getActivity().getWindowManager().getDefaultDisplay();
 585         Point size = new Point();
 586         int screenWidth;
 587         int screenHeight;
 588         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB_MR2) {
 589             display.getSize(size);
 590             screenWidth = size.x;
 591             screenHeight = size.y;
 592         } else {
 593             screenWidth = display.getWidth();
 594             screenHeight = display.getHeight();
 595         }
 596
 597         if (width > screenWidth) {
 598             // second try to scale down the image , this time depending upon the screen size
 599             scale = (int) Math.floor((float)width / screenWidth);
 600         }
 601         if (height > screenHeight) {
 602             scale = Math.max(scale, (int) Math.floor((float)height / screenHeight));
 603         }
 604         options.inSampleSize = scale;
 605
 606         // really load the bitmap
 607         options.inJustDecodeBounds = false; // the next decodeFile call will be real
 608         return BitmapFactory.decodeFile(storagePath, options);
 609
 610     }
 611 }