Android-декодирование огромного объема памяти

Question

Я хотел сжать/перемасштабировать изображение перед загрузкой. Вот код, который я использую для сжатия. Он отлично подходит для очень больших изображений, но этот particular image съел huge amount of RAM. Я связал необходимые изображения. Вот код, который я использую.

Мне пришлось принудительно вызвать System.gc(), чтобы освободить слишком часто используемую память.

public static File compressImage(File image) throws IOException { 

     // Decode just the boundaries 
     final BitmapFactory.Options mBitmapOptions = new BitmapFactory.Options(); 
     mBitmapOptions.inJustDecodeBounds = true; 

     final FileInputStream fileInputStream = new FileInputStream(image); 
     final Bitmap temporary = BitmapFactory.decodeStream(fileInputStream, null, mBitmapOptions); 
     if (temporary != null) 
      temporary.recycle(); 

     // Calculate inSampleSize 
     // Raw height and width of image 
     final int height = mBitmapOptions.outHeight; 
     final int width = mBitmapOptions.outWidth; 
     final int sideLength = 800; 
     closeQuietly(fileInputStream); 

     int reqHeight = height; 
     int reqWidth = width; 
     final int inDensity; 
     final int inTargetDensity; 

     if (height > width) { 

      inDensity = height; 
      inTargetDensity = reqHeight; 
      if (height > sideLength) { 

       reqHeight = sideLength; 
       reqWidth = (width * sideLength)/height; 
      } 
     } else if (width > height) { 

      inDensity = width; 
      inTargetDensity = reqWidth; 
      if (width > sideLength) { 
       reqWidth = sideLength; 
       reqHeight = (height * sideLength)/width; 
      } 
     } else { 

      reqWidth = sideLength; 
      reqHeight = sideLength; 
      inDensity = height; 
      inTargetDensity = reqHeight; 
     } 

     int inSampleSize = 1; 

     if (height > reqHeight || width > reqWidth) { 

      final int halfHeight = height/2; 
      final int halfWidth = width/2; 

      // Calculate the largest inSampleSize value that is a power of 2 and keeps both 
      // height and width larger than the requested height and width. 
      while ((halfHeight/inSampleSize) > reqHeight && (halfWidth/inSampleSize) > reqWidth) 
       inSampleSize *= 2; 
     } 

     //now go resize the image to the size you want 
     mBitmapOptions.inSampleSize = inSampleSize; 
     mBitmapOptions.inDither = true; 
     mBitmapOptions.inPreferQualityOverSpeed = true; 
     mBitmapOptions.inPreferredConfig = Bitmap.Config.RGB_565; 
     mBitmapOptions.inJustDecodeBounds = false; 
     mBitmapOptions.inScaled = true; 
     mBitmapOptions.inDensity = inDensity; 
     mBitmapOptions.inTargetDensity = inTargetDensity * mBitmapOptions.inSampleSize; 

     final File tempFile = File.createTempFile("compressed_profile_photo", null); 
     final FileInputStream fInputStream = new FileInputStream(image); 
     final FileOutputStream fileOutputStream = new FileOutputStream(tempFile); 

     // will load & resize the image to be 1/inSampleSize dimensions 
     final Bitmap bitmap = BitmapFactory.decodeStream(fInputStream, null, mBitmapOptions); 
     bitmap.compress(Bitmap.CompressFormat.JPEG, 85, fileOutputStream); 
     fileOutputStream.flush(); 
     bitmap.recycle(); 
     closeQuietly(fInputStream, fileOutputStream); 

     //noinspection ResultOfMethodCallIgnored 
     image.delete(); 
     return tempFile; 
    } 

Answer 1

Был глупая ошибка в этой части:

if (height > width) { 

      inDensity = height; 
      inTargetDensity = reqHeight; 
      if (height > sideLength) { 

       reqHeight = sideLength; 
       reqWidth = (width * sideLength)/height; 
      } 
     } else if (width > height) { 

      inDensity = width; 
      inTargetDensity = reqWidth; 
      if (width > sideLength) { 
       reqWidth = sideLength; 
       reqHeight = (height * sideLength)/width; 
      } 
     } 

это должно быть так:

if (height > width) { 

      if (height > sideLength) { 

       reqHeight = sideLength; 
       reqWidth = (width * sideLength)/height; 
      } 
      inDensity = height; 
      inTargetDensity = reqHeight; 

     } else if (width > height) { 

      if (width > sideLength) { 
       reqWidth = sideLength; 
       reqHeight = (height * sideLength)/width; 
      } 
      inDensity = width; 
      inTargetDensity = reqWidth; 

     } 

Из-за этого изменения размера даже не происходит!

Answer 2

Возможно, просто следуйте the tip of the Official Training?

private void setPic() { 
    // Get the dimensions of the View 
    int targetW = mImageView.getWidth(); 
    int targetH = mImageView.getHeight(); 

    // Get the dimensions of the bitmap 
    BitmapFactory.Options bmOptions = new BitmapFactory.Options(); 
    bmOptions.inJustDecodeBounds = true; 
    BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); 
    int photoW = bmOptions.outWidth; 
    int photoH = bmOptions.outHeight; 

    // Determine how much to scale down the image 
    int scaleFactor = Math.min(photoW/targetW, photoH/targetH); 

    // Decode the image file into a Bitmap sized to fill the View 
    bmOptions.inJustDecodeBounds = false; 
    bmOptions.inSampleSize = scaleFactor; 
    bmOptions.inPurgeable = true; 

    Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); 
    mImageView.setImageBitmap(bitmap); 
}