diff --git a/metadata/org.solovyev.android.calculator.yml b/metadata/org.solovyev.android.calculator.yml
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+++ b/metadata/org.solovyev.android.calculator.yml
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+Categories:
+  - System
+License: Apache-2.0
+AuthorName: Sergey Solovyev
+AuthorEmail: se.solovyev@gmail.com
+SourceCode: https://github.com/Bubu/android-calculatorpp
+IssueTracker: https://github.com/serso/android-calculatorpp/issues
+
+Summary: Scientific calculator with sleek interface and powerful capabilities
+Description: |-
+    Are you looking for an efficient and easy-to-use calculator?
+    Do you want to solve both simple and complex problems?
+    Try Calculator++, a multipurpose calculator app with slick and intuitive user interface!
+
+    ★ Save your time!
+    * Access additional features from the main screen of the app using gestures. For example, to use «%» slide button «/» up
+    * You don't need to press «=» anymore - result is calculated automatically
+    * Copy/paste with a single button press
+    * App supports both portrait and landscape screen orientations
+
+    ★ Personalize!
+    * C++ has two layouts: standard and engineer. Choose one which suits you best either from the initial wizard or from the application settings
+    * Set theme you like
+    * Add home screen widget
+
+    ★ Do calculations without switching between the apps!
+    Calculator++ can work in a separate window floating over other applications on your phone
+
+    ★ Calculate percentages, square roots, powers, trigonometric functions!
+    Calculator has a big variety of built-in functions and supports adding new user-defined functions
+
+    ★ Plot 2D and 3D graphs!
+    Several functions can be plotted simultaneously
+
+    ★ Use powerful mathematical capabilities of the app:
+    * Do calculations with variables and constants
+    * Use built-in functions or add your own
+    * Integrate and differentiate
+    * Do calculations with fractions and simplify expressions
+    * Do calculations with complex numbers
+
+RepoType: git
+Repo: https://github.com/Bubu/android-calculatorpp
+
+Builds:
+  - versionName: 2.2.7
+    versionCode: 157
+    commit: release-2.2.7
+    subdir: app
+    gradle:
+      - yes
+    srclibs:
+      - serso-plotter@3683ea6b242a02164379d628c265ff849abe6e31
+      - serso-otto@7d9c4ad443ccf75a4908941f2d555d1fb52f28a9
+    prebuild: cp $$serso-plotter$$/lib/build/outputs/aar/lib-release.aar ./misc/libs/plotter.aar
+
+MaintainerNotes: otto is installed to the local maven repo (~/.m2) and used during
+    the build from there.
+
+AutoUpdateMode: Version release-%v
+UpdateCheckMode: Tags
+CurrentVersion: 2.2.7
+CurrentVersionCode: 157
diff --git a/srclibs/serso-otto.txt b/srclibs/serso-otto.txt
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+++ b/srclibs/serso-otto.txt
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+Repo Type:git
+Repo:https://github.com/serso/otto
+
+Prepare:mvn -pl '!otto-sample' -Dcheckstyle.skip  install
diff --git a/srclibs/serso-plotter.txt b/srclibs/serso-plotter.txt
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index 0000000000..501f2b3d05
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+++ b/srclibs/serso-plotter.txt
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+Repo Type:git
+Repo:https://github.com/serso/android-plotter
+
+Prepare:rm app/libs/exp4j-0.4.6-SNAPSHOT.jar && sed -i -e '/signing {/,+3d' lib/build.gradle && gradle lib:assemble