ImageUtils.java revision bb137c8e2ed363e6f5e2c0f14719483d27e8c062
1bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp/* 2bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Copyright (C) 2011 Google Inc. 3bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Licensed to The Android Open Source Project. 4bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 5bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Licensed under the Apache License, Version 2.0 (the "License"); 6bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * you may not use this file except in compliance with the License. 7bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * You may obtain a copy of the License at 8bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 9bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * http://www.apache.org/licenses/LICENSE-2.0 10bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 11bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Unless required by applicable law or agreed to in writing, software 12bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * distributed under the License is distributed on an "AS IS" BASIS, 13bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * See the License for the specific language governing permissions and 15bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * limitations under the License. 16bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp */ 17bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 18bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copppackage com.android.ex.photo.util; 19bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 20bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.content.ContentResolver; 21bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.graphics.Bitmap; 22bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.graphics.BitmapFactory; 239323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrookimport android.graphics.Matrix; 24bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.graphics.Point; 25bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.graphics.Rect; 26bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.net.Uri; 27bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.os.Build; 28dccd6d91ca82225395af470595e4ffb8734dac1aMark Brophyimport android.util.Base64; 29bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport android.util.Log; 30bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 31bb137c8e2ed363e6f5e2c0f14719483d27e8c062Mathew Inwoodimport com.android.ex.photo.PhotoViewController; 32ca8fdcd23fcc53e0429abf8d4ef80e8d6d8fe6faMartin Hibdonimport com.android.ex.photo.loaders.PhotoBitmapLoaderInterface.BitmapResult; 33bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 34237ded1a59b1fc148a3ffcf78d6f9d34af5c170cPaul Westbrookimport java.io.ByteArrayInputStream; 35bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport java.io.FileNotFoundException; 36bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport java.io.IOException; 37bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Coppimport java.io.InputStream; 38dccd6d91ca82225395af470595e4ffb8734dac1aMark Brophyimport java.util.regex.Pattern; 39bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 409323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook 41bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp/** 42bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Image utilities 43bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp */ 44bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copppublic class ImageUtils { 45bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp // Logging 46bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp private static final String TAG = "ImageUtils"; 47bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 48bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp /** Minimum class memory class to use full-res photos */ 49bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp private final static long MIN_NORMAL_CLASS = 32; 50bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp /** Minimum class memory class to use small photos */ 51bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp private final static long MIN_SMALL_CLASS = 24; 52bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 53dccd6d91ca82225395af470595e4ffb8734dac1aMark Brophy private static final String BASE64_URI_PREFIX = "base64,"; 54dccd6d91ca82225395af470595e4ffb8734dac1aMark Brophy private static final Pattern BASE64_IMAGE_URI_PATTERN = Pattern.compile("^(?:.*;)?base64,.*"); 55dccd6d91ca82225395af470595e4ffb8734dac1aMark Brophy 56bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp public static enum ImageSize { 57bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp EXTRA_SMALL, 58bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp SMALL, 59bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp NORMAL, 60bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 61bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 62bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp public static final ImageSize sUseImageSize; 63bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp static { 64bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp // On HC and beyond, assume devices are more capable 65bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp if (Build.VERSION.SDK_INT >= 11) { 66bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp sUseImageSize = ImageSize.NORMAL; 67bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } else { 68bb137c8e2ed363e6f5e2c0f14719483d27e8c062Mathew Inwood if (PhotoViewController.sMemoryClass >= MIN_NORMAL_CLASS) { 69bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp // We have plenty of memory; use full sized photos 70bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp sUseImageSize = ImageSize.NORMAL; 71bb137c8e2ed363e6f5e2c0f14719483d27e8c062Mathew Inwood } else if (PhotoViewController.sMemoryClass >= MIN_SMALL_CLASS) { 72bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp // We have slight less memory; use smaller sized photos 73bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp sUseImageSize = ImageSize.SMALL; 74bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } else { 75bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp // We have little memory; use very small sized photos 76bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp sUseImageSize = ImageSize.EXTRA_SMALL; 77bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 78bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 79bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 80bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 81bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp /** 82bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * @return true if the MimeType type is image 83bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp */ 84bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp public static boolean isImageMimeType(String mimeType) { 85bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp return mimeType != null && mimeType.startsWith("image/"); 86bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 87bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 88bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp /** 89bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Create a bitmap from a local URI 90bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 91bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * @param resolver The ContentResolver 92c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * @param uri The local URI 93c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * @param maxSize The maximum size (either width or height) 94f24e7099f9688518d705116c1b4279fc6279d3d6Mark Wei * @return The new bitmap or null 95bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp */ 96c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public static BitmapResult createLocalBitmap(final ContentResolver resolver, final Uri uri, 97c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final int maxSize) { 98c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final BitmapResult result = new BitmapResult(); 99c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final InputStreamFactory factory = createInputStreamFactory(resolver, uri); 100bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp try { 101c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final Point bounds = getImageBounds(factory); 102c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei if (bounds == null) { 103112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp result.status = BitmapResult.STATUS_EXCEPTION; 104112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp return result; 1057aabd796bbcb149db9ac183c1d0aec09fccd42a4Adam Copp } 106bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 107c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final BitmapFactory.Options opts = new BitmapFactory.Options(); 108c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei opts.inSampleSize = Math.max(bounds.x / maxSize, bounds.y / maxSize); 109c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei result.bitmap = decodeStream(factory, null, opts); 110112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp result.status = BitmapResult.STATUS_SUCCESS; 111112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp return result; 112bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 113bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } catch (FileNotFoundException exception) { 114bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp // Do nothing - the photo will appear to be missing 115bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } catch (IOException exception) { 116112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp result.status = BitmapResult.STATUS_EXCEPTION; 1171f00d9d7c4beb007d491fc766f7a0c8fc4977a50The Android Open Source Project } catch (IllegalArgumentException exception) { 1181f00d9d7c4beb007d491fc766f7a0c8fc4977a50The Android Open Source Project // Do nothing - the photo will appear to be missing 1192de1aa6bc9a936ff3f2f654db770a091904533d7Mark Wei } catch (SecurityException exception) { 120112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp result.status = BitmapResult.STATUS_EXCEPTION; 121bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 122112958e7a0493f2e692bbc40d113e98715caaab8Adam Copp return result; 123bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 124bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 125bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp /** 126bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Wrapper around {@link BitmapFactory#decodeStream(InputStream, Rect, 127bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * BitmapFactory.Options)} that returns {@code null} on {@link 128bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * OutOfMemoryError}. 129bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 130c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * @param factory Used to create input streams that holds the raw data to be decoded into a 131c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * bitmap. 132bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * @param outPadding If not null, return the padding rect for the bitmap if 133bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * it exists, otherwise set padding to [-1,-1,-1,-1]. If 134bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * no bitmap is returned (null) then padding is 135bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * unchanged. 136c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * @param opts null-ok; Options that control downsampling and whether the 137c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * image should be completely decoded, or just is size returned. 138bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * @return The decoded bitmap, or null if the image data could not be 139c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * decoded, or, if opts is non-null, if opts requested only the 140c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * size be returned (in opts.outWidth and opts.outHeight) 141bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp */ 142c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public static Bitmap decodeStream(final InputStreamFactory factory, final Rect outPadding, 143c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final BitmapFactory.Options opts) throws FileNotFoundException { 144c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei InputStream is = null; 145bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp try { 1469323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook // Determine the orientation for this image 147c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei is = factory.createInputStream(); 148c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final int orientation = Exif.getOrientation(is, -1); 149274afea9b667b551d9582a3088fc27012d0e9a29Hao Pan if (is != null) { 150274afea9b667b551d9582a3088fc27012d0e9a29Hao Pan is.close(); 151274afea9b667b551d9582a3088fc27012d0e9a29Hao Pan } 152237ded1a59b1fc148a3ffcf78d6f9d34af5c170cPaul Westbrook 153c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei // Decode the bitmap 154c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei is = factory.createInputStream(); 155c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final Bitmap originalBitmap = BitmapFactory.decodeStream(is, outPadding, opts); 1569323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook 157c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei if (is != null && originalBitmap == null && !opts.inJustDecodeBounds) { 15806d8b5e82b9b75588051a492152fda0b63f70484Mark Wei Log.w(TAG, "ImageUtils#decodeStream(InputStream, Rect, Options): " 15906d8b5e82b9b75588051a492152fda0b63f70484Mark Wei + "Image bytes cannot be decoded into a Bitmap"); 16006d8b5e82b9b75588051a492152fda0b63f70484Mark Wei throw new UnsupportedOperationException( 16106d8b5e82b9b75588051a492152fda0b63f70484Mark Wei "Image bytes cannot be decoded into a Bitmap."); 16206d8b5e82b9b75588051a492152fda0b63f70484Mark Wei } 163c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 164c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei // Rotate the Bitmap based on the orientation 1659323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook if (originalBitmap != null && orientation != 0) { 1669323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook final Matrix matrix = new Matrix(); 1679323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook matrix.postRotate(orientation); 1689323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook return Bitmap.createBitmap(originalBitmap, 0, 0, originalBitmap.getWidth(), 1699323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook originalBitmap.getHeight(), matrix, true); 1709323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook } 1719323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook return originalBitmap; 172bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } catch (OutOfMemoryError oome) { 173bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp Log.e(TAG, "ImageUtils#decodeStream(InputStream, Rect, Options) threw an OOME", oome); 174bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp return null; 1759323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook } catch (IOException ioe) { 1769323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook Log.e(TAG, "ImageUtils#decodeStream(InputStream, Rect, Options) threw an IOE", ioe); 1779323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook return null; 1789323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook } finally { 179c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei if (is != null) { 1809323b13fc9bc79ce38ce7c851a2aa894ab988ed0Paul Westbrook try { 181c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei is.close(); 182237ded1a59b1fc148a3ffcf78d6f9d34af5c170cPaul Westbrook } catch (IOException e) { 183237ded1a59b1fc148a3ffcf78d6f9d34af5c170cPaul Westbrook // Do nothing 184237ded1a59b1fc148a3ffcf78d6f9d34af5c170cPaul Westbrook } 185237ded1a59b1fc148a3ffcf78d6f9d34af5c170cPaul Westbrook } 186bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 187bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 188bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 189bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp /** 190bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * Gets the image bounds 191bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 192c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * @param factory Used to create the InputStream. 193bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * 194bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp * @return The image bounds 195bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp */ 196c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei private static Point getImageBounds(final InputStreamFactory factory) 197bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp throws IOException { 198bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp final BitmapFactory.Options opts = new BitmapFactory.Options(); 199c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei opts.inJustDecodeBounds = true; 200c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei decodeStream(factory, null, opts); 201bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 202c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return new Point(opts.outWidth, opts.outHeight); 203c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 204c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 205c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei private static InputStreamFactory createInputStreamFactory(final ContentResolver resolver, 206c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final Uri uri) { 207c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final String scheme = uri.getScheme(); 2087a75fba57ed82c4b0fea362ce739ab253eac909fAdam Copp if ("data".equals(scheme)) { 209c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return new DataInputStreamFactory(resolver, uri); 210c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 211c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return new BaseInputStreamFactory(resolver, uri); 212c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 213c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 214c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei /** 215c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * Utility class for when an InputStream needs to be read multiple times. For example, one pass 216c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * may load EXIF orientation, and the second pass may do the actual Bitmap decode. 217c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei */ 218c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public interface InputStreamFactory { 219c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 220c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei /** 221c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * Create a new InputStream. The caller of this method must be able to read the input 222c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * stream starting from the beginning. 223c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei * @return 224c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei */ 225c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei InputStream createInputStream() throws FileNotFoundException; 226c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 227c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 228c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei private static class BaseInputStreamFactory implements InputStreamFactory { 229c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei protected final ContentResolver mResolver; 230c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei protected final Uri mUri; 231c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 232c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public BaseInputStreamFactory(final ContentResolver resolver, final Uri uri) { 233c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei mResolver = resolver; 234c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei mUri = uri; 235c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 236c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 237c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei @Override 238c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public InputStream createInputStream() throws FileNotFoundException { 239c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return mResolver.openInputStream(mUri); 240c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 241c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 242c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 243c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei private static class DataInputStreamFactory extends BaseInputStreamFactory { 244c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei private byte[] mData; 245c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 246c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public DataInputStreamFactory(final ContentResolver resolver, final Uri uri) { 247c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei super(resolver, uri); 248c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 249c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei 250c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei @Override 251c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei public InputStream createInputStream() throws FileNotFoundException { 252c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei if (mData == null) { 253c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei mData = parseDataUri(mUri); 254c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei if (mData == null) { 255c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return super.createInputStream(); 256bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 257bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 258c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return new ByteArrayInputStream(mData); 259bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 260bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp 261c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei private byte[] parseDataUri(final Uri uri) { 262c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final String ssp = uri.getSchemeSpecificPart(); 263bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp try { 264c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei if (ssp.startsWith(BASE64_URI_PREFIX)) { 265c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final String base64 = ssp.substring(BASE64_URI_PREFIX.length()); 266c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return Base64.decode(base64, Base64.URL_SAFE); 267c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } else if (BASE64_IMAGE_URI_PATTERN.matcher(ssp).matches()){ 268c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei final String base64 = ssp.substring( 269c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei ssp.indexOf(BASE64_URI_PREFIX) + BASE64_URI_PREFIX.length()); 270c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return Base64.decode(base64, Base64.DEFAULT); 271c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } else { 272c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei return null; 273c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } 274c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei } catch (IllegalArgumentException ex) { 275c631b5a4b1f19f84a70b772bc879fae7c92fd4a8Mark Wei Log.e(TAG, "Mailformed data URI: " + ex); 276bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp return null; 277bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 278bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 279bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp } 280bd8b47b147f29f196f37d66ccb561d40414ab5b6Adam Copp} 281