Is there a way to load several vector PBF files that are in a folder in a similar way than it's possible to do it now from an online source?
My app deals with several MBTiles files, but I'd prefer to read a folder with PBFs in it instead. So I can load all the maps using only one layer and without having to remove the previous layer (bound to one MBTiles) and adding a new one.
I can load PBFs from an online source by adding a layer bound to a HTTPTileDataSource:
HTTPTileDataSource(
0,
14,
"https://www.my-server.com/tiles/v3/{z}/{x}/{y}.pbf?key=MY_API_KEY)
I'd like to do the same, but with PBFs that are in the Android device. So there's offline support. Obviously, I can do this loading an MBTiles file, as I said above, but my use case has several files, and I'd like a transparent, smooth and simpler transition between maps.
Could I write somehow the above URL in a way that it loads the PBFs from my device?
Thanks in advance!
UPDATE
I forgot to mention that what I've tried so far didn't work. Basically I used the convention to access files on an Android device:
HTTPTileDataSource(
0,
14,
Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "/my-app/mbtiles/{z}/{x}/{y}.pbf")
This throws errors like:
2019-09-13 13:36:37.096 4432-4554/com.myapp.com.debug I/carto-mobile-sdk: HTTPTileDataSource::loadTile: Loading /storage/emulated/0/myapp/mbtiles/10/504/399.pbf
2019-09-13 13:36:37.096 4432-4554/com.myapp.com.debug E/carto-mobile-sdk: HTTPTileDataSource::loadTile: Exception while loading tile 10/504/399: Invalid URL: /storage/emulated/0/myapp/mbtiles/10/504/399.pbf
2019-09-13 13:36:37.096 4432-4554/com.myapp.com.debug I/carto-mobile-sdk: HTTPTileDataSource::loadTile: Loading /storage/emulated/0/myapp/mbtiles/10/503/399.pbf
2019-09-13 13:36:37.097 4432-4554/com.myapp.com.debug E/carto-mobile-sdk: HTTPTileDataSource::loadTile: Exception while loading tile 10/503/399: Invalid URL: /storage/emulated/0/myapp/mbtiles/10/503/399.pbf
However, if I tried to read those files, by using the File class, and checking the canRead() method, they are readable. So they are there.
Perhaps the issue is with the library that has been used to establish HTTP connections, that doesn't accept internal files?
Using a similar approach, that prefixes the URLs with the "file://" protocol, throws a different error. The code is:
return new HTTPTileDataSource(
0,
14,
"file://" + Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "myapp/mbtiles/{z}/{x}/{y}.pbf");
And the error is:
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] JNI DETECTED ERROR IN APPLICATION: can't call void java.net.HttpURLConnection.setRequestMethod(java.lang.String) on instance of sun.net.www.protocol.file.FileURLConnection
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] in call to CallVoidMethodV
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] "Thread-51" prio=1 tid=37 Runnable
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] | group="main" sCount=0 dsCount=0 flags=0 obj=0x14500000 self=0x8a8ac800
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] | sysTid=5073 nice=19 cgrp=default sched=0/0 handle=0x8a782970
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] | state=R schedstat=( 61800737 288938844 285 ) utm=6 stm=0 core=2 HZ=100
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] | stack=0x8a688000-0x8a68a000 stackSize=1006KB
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] | held mutexes= "mutator lock"(shared held)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #00 pc 0047eae1 /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, int, BacktraceMap*, char const*, art::ArtMethod*, void*)+209)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #01 pc 0057c193 /system/lib/libart.so (art::Thread::DumpStack(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, bool, BacktraceMap*, bool) const+355)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #02 pc 00577693 /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, bool, BacktraceMap*, bool) const+83)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #03 pc 00395256 /system/lib/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+1254)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #04 pc 003956c1 /system/lib/libart.so (art::JavaVMExt::JniAbortV(char const*, char const*, char*)+113)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #05 pc 0014f207 /system/lib/libart.so (art::ScopedCheck::AbortF(char const*, ...)+71)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #06 pc 00152ff5 /system/lib/libart.so (art::ScopedCheck::CheckMethodAndSig(art::ScopedObjectAccess&, _jobject*, _jclass*, _jmethodID*, art::Primitive::Type, art::InvokeType)+1941)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #07 pc 00151a3d /system/lib/libart.so (art::CheckJNI::CallMethodV(char const*, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, char*, art::Primitive::Type, art::InvokeType)+973)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #08 pc 0013df2b /system/lib/libart.so (art::CheckJNI::CallVoidMethodV(_JNIEnv*, _jobject*, _jmethodID*, char*)+75)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #09 pc 00222680 /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #10 pc 002e4b7a /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #11 pc 00123455 /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #12 pc 00122bfa /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #13 pc 00076084 /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #14 pc 0025d7fc /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #15 pc 001206e1 /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #16 pc 00110bb3 /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #17 pc 000412c7 /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #18 pc 00040e5f /data/app/com.myapp.debug-bfKnles_CQatK-qZx2DX7A==/lib/x86/libcarto_mobile_sdk.so (???)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #19 pc 00071445 /system/lib/libc.so (__pthread_start(void*)+53)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #20 pc 000205db /system/lib/libc.so (__start_thread+75)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] native: #21 pc 0001ec16 /system/lib/libc.so (__bionic_clone+70)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534] (no managed stack frames)
2019-09-13 13:41:33.782 4965-5073/com.myapp.debug A/zygote: java_vm_ext.cc:534]