java - 如何使用 BitmapFactory 加载图像文件但不是原始大小(缩小它)

Question

所以我正在使用这段代码

Bitmap myBitmap = BitmapFactory.decodeFile(fname);

加载图像文件。但有时加载的图像可能很大，如 512x512，我现在不想加载图像的所有 262144 像素，而是加载按比例缩小的图像。我该怎么做？

Answer 1

像这样使用 Bitmap.compress() :

Uri uri = Uri.fromFile(file);
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri); 
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, QUALITY, stream);

质量参数:

int: Hint to the compressor, 0-100. 0 meaning compress for small size, 100 meaning compress for max quality. Some formats, like PNG which is lossless, will ignore the quality setting