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