如何在安卓工作室将图像转换为所需像素图像并上传到云存储

Question

当前我正在从库中选择一个图像作为设备库中的Uri，然后将其转换为位图，然后根据Uri的大小转换为BAOS，然后将它上传到云存储。我想要的是云存储上的每个图像都是200*200像素的图像。

我的代码

File f = new File(resultUri.getPath());
long sizeUri = f.length()/1024;
int quality;
if (sizeUri <= 300)
quality = 30;
else if (sizeUri <= 1000)
quality = 10;
else if (sizeUri <= 2000)
quality = 10;
else if (sizeUri <= 3000)
quality = 10;
else
quality= 5;

ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, baos);
byte[] uploadbaos = baos.toByteArray();
UploadThumbnail(); 

Answer 1

你可以试试这个

public static String resizeAndCompressImageBeforeSend(Context context, String filePath, String fileName) {
final int MAX_IMAGE_SIZE = 350 * 512; // max final file size in kilobytes
// First decode with inJustDecodeBounds=true to check dimensions of image
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize(First we are going to resize the image to 800x800 image, in order to not have a big but very low quality image.
//resizing the image will already reduce the file size, but after resizing we will check the file size and start to compress image
options.inSampleSize = calculateInSampleSize(options, 800, 800);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap bmpPic = BitmapFactory.decodeFile(filePath, options);
int compressQuality = 100; // quality decreasing by 5 every loop.
int streamLength;
do {
ByteArrayOutputStream bmpStream = new ByteArrayOutputStream();
//Log.d("compressBitmap", "Quality: " + compressQuality);
bmpPic.compress(Bitmap.CompressFormat.JPEG, compressQuality, bmpStream);
byte[] bmpPicByteArray = bmpStream.toByteArray();
streamLength = bmpPicByteArray.length;
compressQuality -= 5;
//Log.d("compressBitmap", "Size: " + streamLength/1024+" kb");
} while (streamLength >= MAX_IMAGE_SIZE);
try {
//save the resized and compressed file to disk cache
//Log.d("compressBitmap","cacheDir: "+ context.getCacheDir());
FileOutputStream bmpFile = new FileOutputStream(context.getCacheDir() + fileName);
bmpPic.compress(Bitmap.CompressFormat.JPEG, compressQuality, bmpFile);
bmpFile.flush();
bmpFile.close();
} catch (Exception e) {
Log.e("compressBitmap", "Error on saving file");
}
//return the path of resized and compressed file
return context.getCacheDir() + fileName;
}
static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
String debugTag = "MemoryInformation";
// The width and height of the Image n before being processed
final int height = options.outHeight;
final int width = options.outWidth;
//Log.d(debugTag,"image height: "+height+ "---image width: "+ width);
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;
}
}
//Log.d(debugTag,"inSampleSize: "+inSampleSize);
return inSampleSize;
}

您可以使用它来调整位图的大小

private static Bitmap resize(Bitmap image, int maxWidth, int maxHeight) {
try {
if (maxHeight > 0 && maxWidth > 0) {
int width = image.getWidth();
int height = image.getHeight();
float ratioBitmap = (float) width / (float) height;
float ratioMax = (float) maxWidth / (float) maxHeight;
int finalWidth = maxWidth;
int finalHeight = maxHeight;
if (ratioMax > ratioBitmap) {
finalWidth = (int) ((float) maxHeight * ratioBitmap);
} else {
finalHeight = (int) ((float) maxWidth / ratioBitmap);
}
image = Bitmap.createScaledBitmap(image, finalWidth, finalHeight, true);
return image;
} else {
return image;
}
} catch (Exception e) {
return image;
}
}