OutOfMemoryErrorなしで目的のサイズの画像を取得+ EXIFの向きに応じて自動回転

ImageManager im = new ImageManager(ctx, 100, 100); Bitmap bm = im.setIsScale(true) .setIsResize(true) .setIsCrop(true) .getFromFile(myUri.toString());
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 InputStream in = ... // InputStream BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeStream(in, null, o); in.close(); int origWidth = o.outWidth; //  int origHeight = o.outHeight; //  int bytesPerPixel = 2 // RGB_555  int maxSize = 480 * 800 * bytesPerPixel; //   Bitmap int desiredWidth = …; //  int desiredHeight = …; //  int desiredSize = _ desiredWidth * _ desiredHeight * bytesPerPixel; //   Bitmap   width  height if (desiredSize < maxSize) maxSize = desiredSize; int scale = 1; //  int origSize = origWidth * origHeight * bytesPerPixel; //   if (origWidth > origHeight) { scale = Math.round((float) origHeight / (float) desiredHeight); } else { scale = Math.round((float) origWidth / (float) desiredWidth); } o = new BitmapFactory.Options(); o.inSampleSize = scale; o.inPreferredConfig = Config.RGB_565; in = … // InputStream.  -     , .         InputStream   (  ByteArrayInputStream  FileInputStream). Bitmap bitmap = BitmapFactory.decodeStream(in, null, o); // Bitmap
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public final class ImageManager { private Context _ctx; private int _boxWidth; private int _boxHeight; private ResizeMode _resizeMode; private ScaleMode _scaleMode; private Config _rgbMode; private boolean _isScale; private boolean _isResize; private boolean _isCrop; private boolean _isRecycleSrcBitmap; private boolean _useOrientation; public ImageManager(Context ctx, int boxWidth, int boxHeight) { this(ctx); _boxWidth = boxWidth; _boxHeight = boxHeight; } public ImageManager(Context ctx) { _ctx = ctx; _isScale = false; _isResize = false; _isCrop = false; _isRecycleSrcBitmap = true; _useOrientation = false; } public ImageManager setResizeMode(ResizeMode mode) { _resizeMode = mode; return this; } public ImageManager setScaleMode(ScaleMode mode) { _scaleMode = mode; return this; } public ImageManager setRgbMode(Config mode) { _rgbMode = mode; return this; } public ImageManager setIsScale(boolean isScale) { _isScale = isScale; return this; } public ImageManager setIsResize(boolean isResize) { _isResize = isResize; return this; } public ImageManager setIsCrop(boolean isCrop) { _isCrop = isCrop; return this; } public ImageManager setUseOrientation(boolean value) { _useOrientation = value; return this; } public ImageManager setIsRecycleSrcBitmap(boolean value) { _isRecycleSrcBitmap = value; return this; } public Bitmap getFromFile(String path) { Uri uri = Uri.parse(path); int orientation = -1; if (_useOrientation) { orientation = getOrientation(_ctx, uri); } Bitmap bitmap = scale(new StreamFromFile(_ctx, path), orientation); return getFromBitmap(bitmap); } public Bitmap getFromBitmap(Bitmap bitmap) { if (bitmap == null) return null; if (_isResize) bitmap = resize(bitmap); if (_isCrop) bitmap = crop(bitmap); return bitmap; } public byte[] getRawFromFile(String path) { return getRawFromFile(path, 75); } public byte[] getRawFromFile(String path, int compressRate) { Bitmap scaledBitmap = getFromFile(path); if (scaledBitmap == null) return null; ByteArrayOutputStream output = new ByteArrayOutputStream(); scaledBitmap.compress(CompressFormat.JPEG, compressRate, output); recycleBitmap(scaledBitmap); byte[] rawImage = output.toByteArray(); if (rawImage == null) { return null; } return rawImage; } public Bitmap getFromByteArray(byte[] rawImage) { Bitmap bitmap = scale(new StreamFromByteArray(rawImage), -1); return getFromBitmap(bitmap); } @SuppressLint("NewApi") private Bitmap scale(IStreamGetter streamGetter, int orientation) { try { InputStream in = streamGetter.Get(); if (in == null) return null; Bitmap bitmap = null; Config rgbMode = _rgbMode != null ? _rgbMode : Config.RGB_565; if (!_isScale) { BitmapFactory.Options o = new BitmapFactory.Options(); o.inPreferredConfig = rgbMode; if (android.os.Build.VERSION.SDK_INT >= 11) { o.inMutable = true; } bitmap = BitmapFactory.decodeStream(in, null, o); in.close(); return bitmap; } if (_boxWidth == 0 || _boxHeight == 0) { if (in != null) in.close(); return null; } ScaleMode scaleMode = _scaleMode != null ? _scaleMode : ScaleMode.EQUAL_OR_GREATER; int bytesPerPixel = rgbMode == Config.ARGB_8888 ? 4 : 2; int maxSize = 480 * 800 * bytesPerPixel; int desiredSize = _boxWidth * _boxHeight * bytesPerPixel; if (desiredSize < maxSize) maxSize = desiredSize; BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeStream(in, null, o); in.close(); int scale = 1; int origWidth; int origHeight; if (orientation == 90 || orientation == 270) { origWidth = o.outHeight; origHeight = o.outWidth; } else { origWidth = o.outWidth; origHeight = o.outHeight; } while ((origWidth * origHeight * bytesPerPixel) * (1 / Math.pow(scale, 2)) > maxSize) { scale++; } if (scaleMode == ScaleMode.EQUAL_OR_LOWER) { scale++; } o = new BitmapFactory.Options(); o.inSampleSize = scale; o.inPreferredConfig = rgbMode; in = streamGetter.Get(); if (in == null) return null; bitmap = BitmapFactory.decodeStream(in, null, o); in.close(); if (orientation > 0) { Matrix matrix = new Matrix(); matrix.postRotate(orientation); Bitmap decodedBitmap = bitmap; bitmap = Bitmap.createBitmap(decodedBitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); if (decodedBitmap != null && !decodedBitmap.equals(bitmap)) { recycleBitmap(decodedBitmap); } } return bitmap; } catch (IOException e) { return null; } } private Bitmap resize(Bitmap sourceBitmap) { if (sourceBitmap == null) return null; if (_resizeMode == null) _resizeMode = ResizeMode.EQUAL_OR_GREATER; float srcRatio; float boxRatio; int srcWidth = 0; int srcHeight = 0; int resizedWidth = 0; int resizedHeight = 0; srcWidth = sourceBitmap.getWidth(); srcHeight = sourceBitmap.getHeight(); if (_resizeMode == ResizeMode.EQUAL_OR_GREATER && (srcWidth <= _boxWidth || srcHeight <= _boxHeight) || _resizeMode == ResizeMode.EQUAL_OR_LOWER && srcWidth <= _boxWidth && srcHeight <= _boxHeight) { return sourceBitmap; } srcRatio = (float)srcWidth / (float)srcHeight; boxRatio = (float)_boxWidth / (float)_boxHeight; if (srcRatio > boxRatio && _resizeMode == ResizeMode.EQUAL_OR_GREATER || srcRatio < boxRatio && _resizeMode == ResizeMode.EQUAL_OR_LOWER) { resizedHeight = _boxHeight; resizedWidth = (int)((float)resizedHeight * srcRatio); } else { resizedWidth = _boxWidth; resizedHeight = (int)((float)resizedWidth / srcRatio); } Bitmap resizedBitmap = Bitmap.createScaledBitmap(sourceBitmap, resizedWidth, resizedHeight, true); if (_isRecycleSrcBitmap && !sourceBitmap.equals(resizedBitmap)) { recycleBitmap(sourceBitmap); } return resizedBitmap; } private Bitmap crop(Bitmap sourceBitmap) { if (sourceBitmap == null) return null; int srcWidth = sourceBitmap.getWidth(); int srcHeight = sourceBitmap.getHeight(); int croppedX = 0; int croppedY = 0; croppedX = (srcWidth > _boxWidth) ? (int)((srcWidth - _boxWidth) / 2) : 0; croppedY = (srcHeight > _boxHeight) ? (int)((srcHeight - _boxHeight) / 2) : 0; if (croppedX == 0 && croppedY == 0) return sourceBitmap; Bitmap croppedBitmap = null; try { croppedBitmap = Bitmap.createBitmap(sourceBitmap, croppedX, croppedY, _boxWidth, _boxHeight); } catch(Exception e) { } if (_isRecycleSrcBitmap && !sourceBitmap.equals(croppedBitmap)) { recycleBitmap(sourceBitmap); } return croppedBitmap; } public static void recycleBitmap(Bitmap bitmap) { if (bitmap == null || bitmap.isRecycled()) return; bitmap.recycle(); System.gc(); } private static interface IStreamGetter { public InputStream Get(); } private static class StreamFromFile implements IStreamGetter { private String _path; private Context _ctx; public StreamFromFile(Context ctx, String path) { _path = path; _ctx = ctx; } @SuppressWarnings("resource") public InputStream Get() { try { Uri uri = Uri.parse(_path); return "content".equals(uri.getScheme()) ? _ctx.getContentResolver().openInputStream(uri) : new FileInputStream(_path); } catch (FileNotFoundException e) { return null; } } } private static class StreamFromByteArray implements IStreamGetter { private byte[] _rawImage; public StreamFromByteArray(byte[] rawImage) { _rawImage = rawImage; } public InputStream Get() { if (_rawImage == null) return null; return new ByteArrayInputStream(_rawImage); } } private static int getOrientation(Context context, Uri uri) { if ("content".equals(uri.getScheme())) { Cursor cursor = context.getContentResolver().query(uri, new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null); if (cursor == null || cursor.getCount() != 1) { return -1; } cursor.moveToFirst(); int orientation = cursor.getInt(0); cursor.close(); return orientation; } else { try { ExifInterface exif = new ExifInterface(uri.getPath()); int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1); switch (orientation) { case ExifInterface.ORIENTATION_ROTATE_270: return 270; case ExifInterface.ORIENTATION_ROTATE_180: return 180; case ExifInterface.ORIENTATION_ROTATE_90: return 90; case ExifInterface.ORIENTATION_NORMAL: return 0; default: return -1; } } catch (IOException e) { return -1; } } } }