Add Python Android support

python-package/packager/nativelib.py

@@ -16,7 +16,7 @@
 
 def _lib_name() -> str:
     """Return platform dependent shared object name."""
-    if system() in ["Linux", "OS400"] or system().upper().endswith("BSD"):
+    if system() in ["Linux", "Android", "OS400"] or system().upper().endswith("BSD"):
         name = "libxgboost.so"
     elif system() == "Darwin":
         name = "libxgboost.dylib"

python-package/pyproject.toml

@@ -49,6 +49,10 @@ pyspark = ["pyspark", "scikit-learn", "cloudpickle"]
 
 [tool.hatch.build.targets.wheel.hooks.custom]
 
+[tool.cibuildwheel.android.environment]
+# Required for pthread_getname_np
+ANDROID_API_LEVEL = "26"
+
 [tool.isort]
 profile = "black"
 

python-package/xgboost/libpath.py

@@ -49,7 +49,7 @@ def find_lib_path() -> List[str]:
             ]
         )
         dll_path = [os.path.join(p, "xgboost.dll") for p in dll_path]
-    elif sys.platform.startswith(("linux", "freebsd", "emscripten")):
+    elif sys.platform.startswith(("linux", "android", "freebsd", "emscripten")):
         dll_path = [os.path.join(p, "libxgboost.so") for p in dll_path]
     elif sys.platform == "darwin":
         dll_path = [os.path.join(p, "libxgboost.dylib") for p in dll_path]

python-package/xgboost/testing/__init__.py

@@ -64,7 +64,7 @@
 def has_ipv6() -> bool:
     """Check whether IPv6 is enabled on this host."""
     # connection error in macos, still need some fixes.
-    if system() not in ("Linux", "Windows"):
+    if system() not in ("Linux", "Android", "Windows"):
         return False
 
     if socket.has_ipv6: