每次执行时都会出现此问题：
buildozer android debug deploy run
在Android设备上测试我的应用程序。
每次，buildozer都会重新下载
Android SDK Build-tools，修订版22.0.1
我认为这是完全没必要的，并且非常希望阻止它发生，因为它可以节省大量时间。我怎么能阻止它？
这是 buildozer.spec ：
[app]
# (str) Title of your application title = My App
# (str) Package name package.name = myapp
# (str) Package domain (needed for android/ios packaging) package.domain = org.test
# (str) Source code where the main.py live source.dir = .
# (list) Source files to include (let empty to include all the files) source.include_exts = py,png,jpg,kv,atlas
# (list) Source files to exclude (let empty to not exclude anything)
#source.exclude_exts = spec
# (list) List of directory to exclude (let empty to not exclude anything)
#source.exclude_dirs = tests, bin
# (list) List of exclusions using pattern matching
#source.exclude_patterns = license,images/*/*.jpg
# (str) Application versioning (method 1)
#version.regex = __version__ = ['"](.*)['"]
#version.filename = %(source.dir)s/main.py
# (str) Application versioning (method 2) version = 1.0
# (list) Application requirements requirements = kivy, plyer
# (list) Garden requirements
#garden_requirements =
# (str) Presplash of the application
#presplash.filename = %(source.dir)s/data/presplash.png
# (str) Icon of the application
#icon.filename = %(source.dir)s/data/icon.png
# (str) Supported orientation (one of landscape, portrait or all) orientation = landscape
# (bool) Indicate if the application should be fullscreen or not fullscreen = 1
#
# Android specific
#
# (list) Permissions
#android.permissions = INTERNET
# (int) Android API to use
android.api = 19
# (int) Minimum API required (8 = Android 2.2 devices)
#android.minapi = 8
# (int) Android SDK version to use
#android.sdk = 21
# (str) Android NDK version to use
#android.ndk = 9c
# (bool) Use --private data storage (True) or --dir public storage (False)
#android.private_storage = True
# (str) Android NDK directory (if empty, it will be automatically downloaded.)
#android.ndk_path =
# (str) Android SDK directory (if empty, it will be automatically downloaded.)
#android.sdk_path =
# (str) python-for-android git clone directory (if empty, it will be automatically cloned from github)
#android.p4a_dir =
# (list) python-for-android whitelist
#android.p4a_whitelist =
# (str) Android entry point, default is ok for Kivy-based app
#android.entrypoint = org.renpy.android.PythonActivity
# (list) List of Java .jar files to add to the libs so that pyjnius can access
# their classes. Don't add jars that you do not need, since extra jars can slow
# down the build process. Allows wildcards matching, for example:
# OUYA-ODK/libs/*.jar
#android.add_jars = foo.jar,bar.jar,path/to/more/*.jar
# (list) List of Java files to add to the android project (can be java or a
# directory containing the files)
#android.add_src =
# (str) python-for-android branch to use, if not master, useful to try
# not yet merged features.
#android.branch = master
# (str) OUYA Console category. Should be one of GAME or APP
# If you leave this blank, OUYA support will not be enabled
#android.ouya.category = GAME
# (str) Filename of OUYA Console icon. It must be a 732x412 png image.
#android.ouya.icon.filename = %(source.dir)s/data/ouya_icon.png
# (str) XML file to include as an intent filters in <activity> tag
#android.manifest.intent_filters =
# (list) Android additionnal libraries to copy into libs/armeabi
#android.add_libs_armeabi = libs/android/*.so
#android.add_libs_armeabi_v7a = libs/android-v7/*.so
#android.add_libs_x86 = libs/android-x86/*.so
#android.add_libs_mips = libs/android-mips/*.so
# (bool) Indicate whether the screen should stay on
# Don't forget to add the WAKE_LOCK permission if you set this to True
#android.wakelock = False
# (list) Android application meta-data to set (key=value format)
#android.meta_data =
# (list) Android library project to add (will be added in the
# project.properties automatically.)
#android.library_references =