File list (Check if you may need any files):
app
app\.DS_Store
__MACOSX
__MACOSX\app
__MACOSX\app\._.DS_Store
app\.gitignore
app\app.iml
app\build
app\build\.DS_Store
__MACOSX\app\build
__MACOSX\app\build\._.DS_Store
app\build.gradle
app\libs
app\proguard-rules.pro
app\src
app\src\androidTest
app\src\androidTest\java
app\src\androidTest\java\com
app\src\androidTest\java\com\coolapk
app\src\androidTest\java\com\coolapk\developer_verify_package
app\src\androidTest\java\com\coolapk\developer_verify_package\ExampleInstrumentedTest.java
app\src\main
app\src\main\AndroidManifest.xml
app\src\main\java
app\src\main\java\com
app\src\main\java\com\coolapk
app\src\main\java\com\coolapk\developer_verify_package
app\src\main\java\com\coolapk\developer_verify_package\SignatureVerificationActivity.java
app\src\main\res
app\src\main\res\drawable
app\src\main\res\layout
app\src\main\res\layout\activity_signature_verification.xml
app\src\main\res\mipmap-hdpi
app\src\main\res\mipmap-hdpi\ic_launcher.png
app\src\main\res\mipmap-mdpi
app\src\main\res\mipmap-mdpi\ic_launcher.png
app\src\main\res\mipmap-xhdpi
app\src\main\res\mipmap-xhdpi\ic_launcher.png
app\src\main\res\mipmap-xxhdpi
app\src\main\res\mipmap-xxhdpi\ic_launcher.png
app\src\main\res\mipmap-xxxhdpi
app\src\main\res\mipmap-xxxhdpi\ic_launcher.png
app\src\main\res\values
app\src\main\res\values\colors.xml
app\src\main\res\values\dimens.xml
app\src\main\res\values\strings.xml
app\src\main\res\values\styles.xml
app\src\main\res\values-w820dp
app\src\main\res\values-w820dp\dimens.xml
app\src\test
app\src\test\java
app\src\test\java\com
app\src\test\java\com\coolapk
app\src\test\java\com\coolapk\developer_verify_package
app\src\test\java\com\coolapk\developer_verify_package\ExampleUnitTest.java
build
build\.DS_Store
__MACOSX\build
__MACOSX\build\._.DS_Store
build.gradle
DeveloperVerifyPackage.iml
gradle
gradle\.DS_Store
__MACOSX\gradle
__MACOSX\gradle\._.DS_Store
gradle\wrapper
gradle\wrapper\gradle-wrapper.jar
gradle\wrapper\gradle-wrapper.properties
gradle.properties
gradlew
gradlew.bat
local.properties
settings.gradle