我有一个应用程序,用户可以在其中创建活动并从其库中上传图像并将其上传到FirebaseStorage。一切都很好,但图像的大小非常大,我想优化加载/下载过程。我已经尝试过这个:
// Get the data from an ImageView as bytes
imageView.setDrawingCacheEnabled(true);
imageView.buildDrawingCache();
Bitmap bitmap = imageView.getDrawingCache();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] data = baos.toByteArray();
UploadTask uploadTask = mountainsRef.putBytes(data);
uploadTask.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// Handle unsuccessful uploads
}
}).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
// taskSnapshot.getMetadata() contains file metadata such as size, content-type
Uri downloadUrl = taskSnapshot.getDownloadUrl();
}
});
并设置bitmap.compress(Bitmap.CompressFormat.JPEG, 50, baos);
这可行,但这基本上使每个图像都难看。
有没有办法,如果可能的话,在没有完全破坏质量的情况下缩小图像的尺寸?
答案 0 :(得分:0)
帮助我的是我在转换后按比例缩小图像分辨率 捕获的图像为1280 x 720然后它将我的文件大小减少了更多 50%。
这是一个示例方法。
/**
* Compress the file and return the compressed photo
*
* @return photoFile
*/
public File PhotoCompressor(File PhotoFile) {
Bitmap b = BitmapFactory.decodeFile(photoFile.getAbsolutePath());
int originalWidth = b.getWidth();
int originalHeight = b.getHeight();
int boundWidth = COMPRESSED_PHOTO_WIDTH;
int boundHeight = COMPRESSED_PHOTO_HEIGHT;
int newWidth = originalWidth;
int newHeight = originalHeight;
//check if the image needs to be scale width
if (originalWidth > boundWidth) {
//scale width to fit
newWidth = boundWidth;
//scale height to maintain aspect ratio
newHeight = (newWidth * originalHeight) / originalWidth;
}
//now check if we need to scale even the new height
if (newHeight > boundHeight) {
//scale height to fit instead
newHeight = boundHeight;
//scale width to maintain aspect ratio
newWidth = (newHeight * originalWidth) / originalHeight;
}
Log.i(TAG, "Original Image:" + originalHeight + " x" + originalWidth);
Log.i(TAG, "New Image:" + newHeight + " x" + newWidth);
try {
Bitmap out = Bitmap.createScaledBitmap(b, newWidth, newHeight, true);
FileOutputStream fOut;
fOut = new FileOutputStream(photoFile);
out.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
fOut.flush();
fOut.close();
b.recycle();
out.recycle();
} catch (OutOfMemoryError exception) {
Log.e(TAG, "OutofMemory excpetion" + exception);
exception.printStackTrace();
} catch (FileNotFoundException e) {
Log.e(TAG, "File not found excpetion" + e);
e.printStackTrace();
} catch (IOException e) {
Log.e(TAG, "IO exception excpetion" + e);
e.printStackTrace();
}
return photoFile;
}