Add new libraries to Android.mk

Android.mk

 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
+# Module_Tags controls what build flavors the package gets included in.
 LOCAL_MODULE_TAGS := optional
+
+# Package name of the app.
 LOCAL_PACKAGE_NAME := BlissLauncher
+
+# Certificate to use to sign the apk. In this case, sign using platform certificate.
 LOCAL_CERTIFICATE := platform
 LOCAL_DEX_PREOPT := false
 
+# Enable or disable proguard.
 LOCAL_PROGUARD_ENABLED := disabled
 
+# Manifest file for this app.
 LOCAL_MANIFEST_FILE := app/src/main/AndroidManifest.xml
+
+# Resource directory for this app.
 LOCAL_RESOURCE_DIR += $(LOCAL_PATH)/app/src/main/res/
 ifeq ($(TARGET_BUILD_APPS),)
     LOCAL_RESOURCE_DIR += frameworks/support/v7/appcompat/res
@@ -17,34 +26,47 @@ else
     LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/v7/appcompat/res
     LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/v7/gridlayout/res
 endif
+
+# Java source directory for this app.
 LOCAL_SRC_FILES := $(call all-java-files-under, app/src/main/)
 
-# unbundled
+# Unbundled java libraries.
 LOCAL_STATIC_JAVA_LIBRARIES := \
         android-common \
         android-support-v4 \
         android-support-v7-appcompat \
         android-support-v7-gridlayout \
         rxrelay \
-        rxjava \
-        rxandroid
+        rxjava
 
+# Unbundled aar libraries.
+LOCAL_STATIC_JAVA_AAR_LIBRARIES := rxandroid \
+        calligraphy \
+        circleindicator
 
+# SDK Version for this build.
 LOCAL_SDK_VERSION := current
 
 LOCAL_PRIVILEGED_MODULE := true
 
+# Flags for AAPT.
 LOCAL_AAPT_FLAGS := --auto-add-overlay \
 --extra-packages android.support.v4 \
 --extra-packages android.support.v7.appcompat \
 --extra-packages android.support.v7.gridlayout \
-
+--extra-packages uk.co.chrisjenx.calligraphy \
+--extra-packages me.relex.circleindicator
 
 include $(BUILD_PACKAGE)
 
 include $(CLEAR_VARS)
 
-LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := rxrelay:libs/rxrelay-2.0.0.jar rxjava:libs/rxjava-2.1.10.jar  rxandroid:libs/rxandroid-2.0.2.aar
+# Prebuilt java and aar libraries.
+LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := rxrelay:libs/rxrelay-2.0.0.jar \
+        rxjava:libs/rxjava-2.1.10.jar \
+        rxandroid:libs/rxandroid-2.0.2.aar \
+        circleindicator:libs/circleindicator-1.2.2.aar \
+        calligraphy:libs/calligraphy-2.3.0.aar
 
 include $(BUILD_MULTI_PREBUILT)
 

app/src/main/AndroidManifest.xml

@@ -6,6 +6,10 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
+    <uses-sdk
+        android:minSdkVersion="22"
+        android:targetSdkVersion="26"/>
+
     <application
         android:name=".BlissLauncher"
         android:allowBackup="true"