diff --git a/README.md b/README.md
index 915969b..4e7fec3 100644
--- a/README.md
+++ b/README.md
@@ -29,3 +29,9 @@ example](https://github.com/bazelbuild/examples/tree/master/android/firebase-clo
 
 To integrate Crashlytics into your Android app, follow the [instructions in the
 README](tools/crashlytics/README.md) in the `crashlytics` directory.
+
+## Jetifier
+
+For an example of using
+[Jetifier](https://developer.android.com/studio/command-line/jetifier) on legacy
+libraries to use AndroidX libraries, [see this example](tools/jetifier/).
diff --git a/WORKSPACE b/WORKSPACE
index e69de29..1ce7cf7 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -0,0 +1,26 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+RULES_JVM_EXTERNAL_TAG = "2.2"
+RULES_JVM_EXTERNAL_SHA = "f1203ce04e232ab6fdd81897cf0ff76f2c04c0741424d192f28e65ae752ce2d6"
+
+http_archive(
+    name = "rules_jvm_external",
+    strip_prefix = "rules_jvm_external-%s" % RULES_JVM_EXTERNAL_TAG,
+    sha256 = RULES_JVM_EXTERNAL_SHA,
+    url = "https://github.com/bazelbuild/rules_jvm_external/archive/%s.zip" % RULES_JVM_EXTERNAL_TAG,
+)
+
+load("@rules_jvm_external//:defs.bzl", "maven_install")
+
+maven_install(
+    artifacts = [
+        "com.google.dagger:dagger-android-support:2.22.1",
+    ],
+    repositories = [
+        "https://jcenter.bintray.com/",
+        "https://maven.google.com",
+        "https://repo1.maven.org/maven2",
+    ],
+)
+
+android_sdk_repository(name = "androidsdk")
diff --git a/third_party/jetifier/BUILD b/third_party/jetifier/BUILD
new file mode 100644
index 0000000..313273e
--- /dev/null
+++ b/third_party/jetifier/BUILD
@@ -0,0 +1 @@
+exports_files(["jetifier-standalone/bin/jetifier-standalone"])
diff --git a/third_party/jetifier/jetifier-standalone/bin/jetifier-standalone b/third_party/jetifier/jetifier-standalone/bin/jetifier-standalone
new file mode 100755
index 0000000..72d0a15
--- /dev/null
+++ b/third_party/jetifier/jetifier-standalone/bin/jetifier-standalone
@@ -0,0 +1,188 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  jetifier-standalone start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/.." >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="jetifier-standalone"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and JETIFIER_STANDALONE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/lib/jetifier-standalone.jar:$APP_HOME/lib/jetifier-processor-1.0.0-beta05.jar:$APP_HOME/lib/commons-cli-1.3.1.jar:$APP_HOME/lib/jetifier-core-1.0.0-beta05.jar:$APP_HOME/lib/asm-util-6.0.jar:$APP_HOME/lib/asm-commons-6.0.jar:$APP_HOME/lib/asm-tree-6.0.jar:$APP_HOME/lib/asm-6.0.jar:$APP_HOME/lib/jdom2-2.0.6.jar:$APP_HOME/lib/kotlin-stdlib-1.3.31.jar:$APP_HOME/lib/gson-2.8.0.jar:$APP_HOME/lib/kotlin-stdlib-common-1.3.31.jar:$APP_HOME/lib/annotations-13.0.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $JETIFIER_STANDALONE_OPTS -classpath "\"$CLASSPATH\"" com.android.tools.build.jetifier.standalone.Main "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/third_party/jetifier/jetifier-standalone/bin/jetifier-standalone.bat b/third_party/jetifier/jetifier-standalone/bin/jetifier-standalone.bat
new file mode 100755
index 0000000..5040e54
--- /dev/null
+++ b/third_party/jetifier/jetifier-standalone/bin/jetifier-standalone.bat
@@ -0,0 +1,100 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  jetifier-standalone startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%..
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and JETIFIER_STANDALONE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\lib\jetifier-standalone.jar;%APP_HOME%\lib\jetifier-processor-1.0.0-beta05.jar;%APP_HOME%\lib\commons-cli-1.3.1.jar;%APP_HOME%\lib\jetifier-core-1.0.0-beta05.jar;%APP_HOME%\lib\asm-util-6.0.jar;%APP_HOME%\lib\asm-commons-6.0.jar;%APP_HOME%\lib\asm-tree-6.0.jar;%APP_HOME%\lib\asm-6.0.jar;%APP_HOME%\lib\jdom2-2.0.6.jar;%APP_HOME%\lib\kotlin-stdlib-1.3.31.jar;%APP_HOME%\lib\gson-2.8.0.jar;%APP_HOME%\lib\kotlin-stdlib-common-1.3.31.jar;%APP_HOME%\lib\annotations-13.0.jar
+
+@rem Execute jetifier-standalone
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %JETIFIER_STANDALONE_OPTS%  -classpath "%CLASSPATH%" com.android.tools.build.jetifier.standalone.Main %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable JETIFIER_STANDALONE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%JETIFIER_STANDALONE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/tools/jetifier/BUILD b/tools/jetifier/BUILD
new file mode 100644
index 0000000..e019b6f
--- /dev/null
+++ b/tools/jetifier/BUILD
@@ -0,0 +1,11 @@
+load(":defs.bzl", "jetify")
+
+jetify(
+    name = "jetified_dagger",
+    srcs = ["@maven//:v1/https/jcenter.bintray.com/com/google/dagger/dagger-android-support/2.22.1/dagger-android-support-2.22.1.aar"],
+)
+
+aar_import(
+    name = "jetified_dagger_aar",
+    aar = ":jetified_dagger",
+)
diff --git a/tools/jetifier/defs.bzl b/tools/jetifier/defs.bzl
new file mode 100644
index 0000000..ffa240f
--- /dev/null
+++ b/tools/jetifier/defs.bzl
@@ -0,0 +1,35 @@
+def _jetify_impl(ctx):
+    srcs = ctx.attr.srcs
+    outfiles = []
+    for src in srcs:
+        for artifact in src.files.to_list():
+            jetified_outfile = ctx.actions.declare_file("jetified_" + artifact.basename)
+            jetify_args = ctx.actions.args()
+            jetify_args.add_all(["-l", "error"])
+            jetify_args.add_all(["-o", jetified_outfile])
+            jetify_args.add_all(["-i", artifact])
+            ctx.actions.run(
+                mnemonic = "Jetify",
+                inputs = [artifact],
+                outputs = [jetified_outfile],
+                progress_message = "Jetifying {} to create {}.".format(artifact.path, jetified_outfile.path),
+                executable = ctx.executable._jetifier,
+                arguments = [jetify_args],
+                use_default_shell_env = True,
+            )
+            outfiles.append(jetified_outfile)
+
+    return [DefaultInfo(files = depset(outfiles))]
+
+jetify = rule(
+    attrs = {
+        "srcs": attr.label_list(allow_files = [".jar", ".aar"]),
+        "_jetifier": attr.label(
+            executable = True,
+            allow_single_file = True,
+            default = Label("//third_party/jetifier:jetifier-standalone/bin/jetifier-standalone"),
+            cfg = "host",
+        ),
+    },
+    implementation = _jetify_impl,
+)