Android Studio (with build tools such as keytool, jarsigner)
apktool download from https://bitbucket.org/iBotPeaches/apktool/downloads/ and extract and rename to apktool.jar
apktool wrapper script https://raw.githubusercontent.com/iBotPeaches/Apktool/master/scripts/windows/apktool.bat
Java SE 8 JDK download from https://www.oracle.com/java/technologies/javase/javase8u211-later-archive-downloads.html
dex2jar download from https://sourceforge.net/projects/dex2jar/
JD_GUI download from http://jd.benow.ca/
smalidea download from https://github.com/JesusFreke/smalidea
Online Decompiler for apk https://appscms.com/apk-decompiler
jadx download from https://github.com/skylot/jadx/releases
apktool — tool for reverse engineering Android apk files. In this case we are using to extract files from apk and rebuild.
keytool — Java tool for creating keys/certs, that comes with the Java SE JDK.
jarsigner Java tool for signing JAR/APK files, that comes with the Java SE JDK.
zipalign — archive alignment tool, that comes with the Android SDK.
JD-GUI — To view java code
dex2jar — Converts Android dex files to class/jar files.
smalidea is a smali language plugin for AS and to edit the file in Android Studio
jadx — convert single smali file to java code to test the modification of smali
For smali syntax, please refer to this doc
https://programmer.help/blogs/smali-introduction-manual.html
or http://source.android.com/devices/tech/dalvik/dalvik-bytecode.html
Instructions:
First, Take any apk file and unpack(decompile) it. This will create an “application” directory with assets, resources, compiled code, etc.
# To decompile an apk
apktool d -r -s my_application.apkor
apktool d my_application.apkThen, you can use Android Studio to open the smali file and edit it. Use APKRepacker to test the single smali file conversion.
# To recompile(build) the apk
apktool b -f -d my_application -o my_application2.apkAfter recompiling (building) the apk the new apk (my_application2.apk) will be generated in directory.
The APK must be signed before you run on your device. If you want an official key from google play signing key, you should register with https://play.google.com/console/u/0/signup first and pay $25 registration key
Before signing an apk, create a self-signing key if you don't have an existing one from google play. If prompted for a password, create your own password.
These tools are installed withn JDK e.g. in "c:\Program Files\Java\jdk1.8.0_301\bin\". Add this to the environment PATH.
macOS binary are here /Applications/Android Studio.app/Contents/jre/Contents/Home/bin
# To generate a key. And remember the store password
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000# if want to generate SHA256withRSA keystore (in order to get rid of the warning of security when signing with SHA1), use this command
keytool -genkey -v -keystore my-release-key256.keystore -alias mykey256 -sigalg SHA256withRSA -keyalg RSA -keysize 2048 -validity 10000 -deststoretype pkcs12Now sign the APK with the key:
# Sign the apk
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore my_application2.apk alias_name# if Sign with SHA256withRSA (in order to get rid of the warning of security when signing with SHA1)
jarsigner -verbose -sigalg SHA256withRSA -keystore my-release-key256.keystore my_application2.apk mykey256# Verify apk
jarsigner -verify -verbose -certs -keystore my-release-key.keystore my_application2.apk# Verify apk with SHA256withRSA
jarsigner -verify -verbose -certs -keystore my-release-key256.keystore my_application2.apk# Finally, the apk must be aligned for optimal loading:
zipalign is installed with Android SDK e.g. in c:\Users\User\AppData\Local\Android\Sdk\build-tools\28.0.3\zipalign.exe Add this to the environment PATH.
zipalign -v 4 my_application2.apk my_application2-aligned.apkyou have a my_application2-aligned.apk file, which you can install onto your device.
Other useful tools using command prompt under Windows
# Command Prompt to list android virtual devices
%USERPROFILE%\AppData\Local\Android\Sdk\emulator\emulator -list-avds
# PowerShell command to list android virtual devices
& $env:UserProfile\AppData\Local\Android\Sdk\emulator\emulator -list-avds
# Command Prompt to list android virtual device in background
start /b %USERPROFILE%\AppData\Local\Android\Sdk\emulator\emulator -avd Pixel_3a_API_30_x86 -netdelay none -netspeed full
# Command Prompt to show running emulator devices
%USERPROFILE%\AppData\Local\Android\Sdk\platform-tools\adb devices
# Command Prompt to attach to running emulator device shell
%USERPROFILE%\AppData\Local\Android\Sdk\platform-tools\adb -s emulator-5554 shell
# Command Prompt to install apk to running emulator device
%USERPROFILE%\AppData\Local\Android\Sdk\platform-tools\adb -s emulator-5554 install %USERPROFILE%\Downloads\my_application2-aligned.apk
export ANDROID_HOME="%USERPROFILE%\AppData\Local\Android\Sdk"
Other useful tools using Terminal under macOS
# macOS Terminal to list android virtual devices
$HOME/Library/Android/sdk/emulator/emulator -list-avds
# macOS Terminal to show running emulator devices
$HOME/Library/Android/sdk/platform-tools/adb devices
# macOS Terminal to attach to running emulator device shell
$HOME/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell
# macOS Terminal to install apk to running emulator device
$HOME/Library/Android/sdk/platform-tools/adb -s emulator-5554 install ~/Downloads/my_application2-aligned.apk
export ANDROID_HOME="$HOME/Library/Android/sdk"
export JAVA_HOME="/Applications/Android Studio.app/Contents/jre/Contents/Home"
export PATH=$ANDROID_HOME/build-tools/30.0.3:$ANDROID_HOME/platform-tools:$JAVA_HOME/bin:$PATH
- Setup sdk and decompile tools in WSL2 Ubuntu 20.04 Select all
#!/bin/bash
sudo apt install -y libarchive-tools
export ANDROID_SDK_TOOLS_VERSION=6858069
export ANDROID_SDK_TOOLS_CHECKSUM=87f6dcf41d4e642e37ba03cb2e387a542aa0bd73cb689a9e7152aad40a6e7a08
export ANDROID_HOME="/opt/android-sdk-linux"
export ANDROID_SDK_ROOT="/opt/android-sdk-linux"
export ANDROID_DECOMPILE_TOOLS="$ANDROID_HOME/Decompile"
curl -s https://dl.google.com/android/repository/commandlinetools-linux-${ANDROID_SDK_TOOLS_VERSION}_latest.zip > ./tools.zip && echo "$ANDROID_SDK_TOOLS_CHECKSUM ./tools.zip" | sha256sum -c && sudo mkdir -p $ANDROID_HOME && sudo chown $(id -u):$(id -g) $ANDROID_HOME && unzip -qq ./tools.zip -d $ANDROID_HOME && rm -v ./tools.zip
sudo mkdir -p $ANDROID_HOME/licenses/ && sudo chown $(id -u):$(id -g) $ANDROID_HOME/licenses && echo "8933bad161af4178b1185d1a37fbf41ea5269c55\nd56f5187479451eabf01fb78af6dfcb131a6481e\n24333f8a63b6825ea9c5514f83c2829b004d1fee" > $ANDROID_HOME/licenses/android-sdk-license && echo "84831b9409646a918e30573bab4c9c91346d8abd\n504667f4c0de7af1a06de9f4b1727b84351f2910" > $ANDROID_HOME/licenses/android-sdk-preview-license --licenses && yes | $ANDROID_HOME/cmdline-tools/bin/sdkmanager --licenses --sdk_root=${ANDROID_SDK_ROOT}
curl -OL https://raw.githubusercontent.com/MobileDevOps/android-sdk-image/master/packages.txt
$ANDROID_HOME/cmdline-tools/bin/sdkmanager --update --sdk_root=${ANDROID_SDK_ROOT} && while read -r pkg; do PKGS="${PKGS}${pkg} "; done < $HOME/packages.txt && $ANDROID_HOME/cmdline-tools/bin/sdkmanager $PKGS > /dev/null --sdk_root=${ANDROID_SDK_ROOT}
curl -OL https://nchc.dl.sourceforge.net/project/dex2jar/dex2jar-2.0.zip && unzip dex2jar-2.0.zip -d $ANDROID_HOME/Decompile && chmod +x $ANDROID_HOME/Decompile/dex2jar-2.0/*.sh && rm -v dex2jar-2.0.zip
mkdir -p $ANDROID_DECOMPILE_TOOLS/apktool && pushd $ANDROID_DECOMPILE_TOOLS/apktool && curl -OL https://bitbucket.org/iBotPeaches/apktool/downloads/apktool_2.6.0.jar && ln -s apktool_2.6.0.jar apktool.jar && curl -OL https://raw.githubusercontent.com/iBotPeaches/Apktool/master/scripts/linux/apktool && chmod +x apktool && popd
curl -OL https://github.com/skylot/jadx/releases/download/v1.3.3/jadx-1.3.3.zip && unzip jadx-1.3.3.zip -d $ANDROID_DECOMPILE_TOOLS/jadx && rm -v jadx-1.3.3.zip
mkdir -p $ANDROID_DECOMPILE_TOOLS/java2smali && curl -OL https://github.com/izgzhen/java2smali/releases/download/1.1/dist.zip && bsdtar xvf dist.zip --strip-components=1 -C $ANDROID_DECOMPILE_TOOLS/java2smali/ && rm -v dist.zip
mkdir -p $ANDROID_DECOMPILE_TOOLS/java2smali && pushd $ANDROID_HOME/Decompile/java2smali && curl -OL https://github.com/JesusFreke/smali/releases/download/v2.0b6/smali-2.0b6.jar && curl -OL https://github.com/JesusFreke/smali/releases/download/v2.0b6/baksmali-2.0b6.jar && curl -OL https://raw.githubusercontent.com/JesusFreke/smali/master/scripts/smali && curl -OL https://raw.githubusercontent.com/JesusFreke/smali/master/scripts/baksmali && popd
pushd $ANDROID_DECOMPILE_TOOLS/java2smali && ln -s baksmali-2.0b6.jar baksmali.jar && ln -s smali-2.0b6.jar smali.jar && chmod +x baksmali && chmod +x smali && popd
# Then append these lines to ~/.profile
export ANDROID_HOME="/opt/android-sdk-linux"
export ANDROID_SDK_ROOT=$ANDROID_HOME
export ANDROID_DECOMPILE_TOOLS=="$ANDROID_HOME/Decompile"
export PATH=$ANDROID_HOME/cmdline-tools:$ANDROID_HOME/cmdline-tools/bin:$ANDROID_HOME/platform-tools:$ANDROID_HOME/build-tools/30.0.3:$ANDROID_DECOMPILE_TOOLS/jadx/bin:$ANDROID_DECOMPILE_TOOLS/java2smali:$ANDROID_DECOMPILE_TOOLS/apktool:$ANDROID_DECOMPILE_TOOLS/dex2jar-2.0:$PATH
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