Add load pdf from url use okhttp3

[shxdos]

Add load pdf from url use okhttp3

[barteksc]

1. Please use only english language
2. Please reformat code
3. You cannot use Environment.getExternalStorageDirectory() as is, current state must be checked with Environment.getExternalStorageState()
4. You can extend existing sample, but not replace it
5. Your sample does not work, because you have to ask user for WRITE_EXTERNAL_STORAGE permission starting with Android 6.0
6. What will happen when configuration change occurs while downloading file?

[barteksc]

7. PdfViewCache directory is never cleaned
8. When you move app to background document stops downloading and becomes corrupted

[shxdos]

@barteksc thanks

[supportreq]

Is it library working??

[mochadwi]

@barteksc @shxdos any updates for this?

[shubh261096]

@shxdos @barteksc Any update? because the library doesn't work for URL.