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android - 如何在上传到 Firebase 之前压缩图像？

问题描述

我正在创建一个社交网络应用程序，用户可以在其中发布图像，因此当用户上传其图像时，它的尺寸非常大，当我检索该图像时，毕加索花费了太多时间。有什么方法可以在上传之前压缩这些图像而不会造成明显的质量损失，以便可以非常有效和快速地检索它们。PS：我使用 Firebase 作为后端服务器。

这是我上传图片的代码。

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {

    if(requestCode == Gallery_Pick && resultCode == RESULT_OK && data != null){
        ImageUri = data.getData();
        SelectPostImage.setImageURI(ImageUri);
    }
    super.onActivityResult(requestCode, resultCode, data);
}

final StorageReference filePath = PostImagesRef.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");

    final UploadTask uploadTask = filePath.putFile(ImageUri);

    uploadTask.addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            String message = e.toString();
            Toast.makeText(PostActivity.this, "Some Error Occured"+message, Toast.LENGTH_SHORT).show();
            loadingBar.dismiss();
        }
    }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
            Toast.makeText(PostActivity.this, "Image Uploaded Successfully", Toast.LENGTH_SHORT).show();
            Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
                @Override
                public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                    if(!task.isSuccessful()){
                        throw task.getException();
                    }
                    downloadImageUrl = filePath.getDownloadUrl().toString();

                    return filePath.getDownloadUrl();
                }
            }).addOnCompleteListener(new OnCompleteListener<Uri>() {
                @Override
                public void onComplete(@NonNull Task<Uri> task) {
                    if(task.isSuccessful()){

                        downloadImageUrl = task.getResult().toString();
                        Toast.makeText(PostActivity.this, "Saved To Database Successfully", Toast.LENGTH_SHORT).show();
                        SavingPostInformationToDatabase();

                    }
                }
            });
        }
    });

请帮我。任何帮助或建议都将不胜感激。提前致谢。！！:)

标签： androidimagefirebasecompression

解决方案

您可以简单地使用 Glide 调整图像大小并使用该图像上传到 firebase

Glide.with(requireActivity())
                .asBitmap()
                .override(YOUR_IMAGE_SIZE, YOUR_IMAGE_SIZE)
                .load(uri)
                .into(object : CustomTarget<Bitmap>() {
                    override fun onResourceReady(
                        resource: Bitmap,
                        transition: Transition<in Bitmap>?
                    ) {

                        // using bitmapToByte(resource) -> byte
                        // using filePath.putBytes(data) -> uploadTask
                         val filePath = PostImagesRef.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg")

                         val uploadTask = filePath.putBytes(bitmapToByte(resource))
                    }

                    override fun onLoadCleared(placeholder: Drawable?) {
                        // this is called when imageView is cleared on lifecycle call or for
                        // some other reason.
                        // if you are referencing the bitmap somewhere else too other than this imageView
                        // clear it here as you can no longer have the bitmap
                    }
                })

bitmapToByte功能

 fun bitmapToByte(bitmap: Bitmap): ByteArray {
    val stream = ByteArrayOutputStream()
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream)
    return stream.toByteArray()
}

希望这可以帮助

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