Install Bazel from here. Bazel is the primary build system for TensorFlow. Now, edit the WORKSPACE, we can find the WORKSPACE file in the root directory of the TensorFlow that we have cloned earlier.

# Uncomment and update the paths in these entries to build the Android demo.
#android_sdk_repository(
#    name = "androidsdk",
#    api_level = 23,
#    build_tools_version = "25.0.1",
#    # Replace with path to Android SDK on your system
#    path = "<PATH_TO_SDK>",
#)
#
#android_ndk_repository(
#    name="androidndk",
#    path="<PATH_TO_NDK>",
#    api_level=14)

Like below with our sdk and ndk path:

android_sdk_repository(
    name = "androidsdk",
    api_level = 23,
    build_tools_version = "25.0.1",
    # Replace with path to Android SDK on your system
    path = "/Users/amitshekhar/Library/Android/sdk/",
)
android_ndk_repository(
    name="androidndk",
    path="/Users/amitshekhar/Downloads/android-ndk-r13/",
    api_level=14)