在上传到服务器之前如何用Picasso调整图像大小？

Question

I am uploading images with loopj.

params.put("file_"+key+"", new File(String.valueOf(value.getOriginalPath())));

but i want to resize image before upload. Is there a way to resize image "on the fly" - without resizing->saving to SD->uploading? just resize im memory and upload - InputStream?

Thanks.

Answer 1

You can use Bitmap s createScaledBitmap() as explained eg here

How about this one: How to Resize a Bitmap in Android?

EDIT - Sending bitmap to server

A bitmap in memory is quite large as it is not compressed like a PNG or JPEG, instead for every pixel you need 3 or even 4 bytes of memory. Thus you'll want to convert that bitmap into eg an PNG before uploading. This can be done with the Bitmap.compress(...) method, which requires an OutputStream to write the compressed image to. As you do not want to save the image to SD card before uploading, you can use an ByteArrayOutputStream instead to keep the compressed image in memory.

Then, you can attach an ByteArrayInputStream to the bytes written and pass that to loopj.

In code this should look something like so:

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG, quality, outStream);
ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray());

/* ...and then pass inStream loopj */

Answer 2

Target mTarget = new Target() {
    @Override
    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom loadedFrom) {
        Log.d("!!!!!",">>>>>>>>>>>>");
        SaveImage.SaveImageFromBitmap(bitmap);
    }

    @Override
    public void onBitmapFailed(Drawable drawable) {
        Log.d("!!!!!","--------");
    }

    @Override
    public void onPrepareLoad(Drawable drawable) {

    }
};
File file = new File(value.getOriginalPathString());
Picasso.with(AddSpa.this).load(file).resize(800,0).into(mTarget);