在我的应用程序中,我正在调用相机应用程序并拍照并将其保存在特定目录(例如/ sdcard等)中
图片被保存为JPEG图像。如何缩小图像尺寸?是否有可用的图像编码器或压缩方式?
我在以下位置看到了另一篇文章:Android Reduce Size Of Camera Picture
但是这是缩放图像。我正在寻找可以压缩或编码的东西。有可能吗?
感谢,秘鲁语
我不确定无论如何您都可以尝试一下。要减小图像的大小,首先应将图像转换为位图,然后再将其保存到特定目录,然后压缩位图以设置图像的质量并将其写入正确的路径。可以更改图像的质量,希望这将有助于您减小图像的尺寸。
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);`
API:
compress (Bitmap.CompressFormat format, int quality, OutputStream stream)
可能下面的代码对您有用
opt = new BitmapFactory.Options();
opt.inTempStorage = new byte[16 * 1024];
opt.inSampleSize = 4;
opt.outWidth = 640;
opt.outHeight = 480;
Bitmap imageBitmap = BitmapFactory
.decodeStream(in, new Rect(), opt);
Bitmap map = Bitmap.createScaledBitmap(imageBitmap, 100, 100, true);
BitmapDrawable bmd = new BitmapDrawable(map);
ByteArrayOutputStream bao = new ByteArrayOutputStream();
map.compress(Bitmap.CompressFormat.PNG, 90, bao);
ba = bao.toByteArray();
imagedata=Base64.encodeBytes(ba);
使用受本文启发的Glide
https://developer.android.com/topic/performance/graphics/load-bitmap
Gilde API
https://bumptech.github.io/glide/
// using some options for JPEG
RequestOptions myOptions = new RequestOptions()
.encodeFormat(Bitmap.CompressFormat.JPEG)
.override(1280, 1024) // this is what you need to take care of WxH
.fitCenter(); // or centerCrop
// uri may be local or web url anything
Glide.with(this).asBitmap().load(uri).apply(myOptions).listener(new RequestListener<Bitmap>() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Bitmap> target, boolean isFirstResource) {
showSnackBar("There was some error in fetching images");
return false;
}
@Override
public boolean onResourceReady(Bitmap bitmap, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
// do whatever with the bitmap object here
return true;
}
}).submit();