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