DT @21.09.2015: Gradle Scripts hinzugefügt...

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        jcenter()
+        maven { url 'https://maven.fabric.io/public' }
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.google.gms:google-services:1.3.0-beta1'
+        classpath 'io.fabric.tools:gradle:1.+'
+    }
+}
+

gradle.properties

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+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+# Default value: -Xmx10248m -XX:MaxPermSize=256m
+# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true

proguard-com.twitter.sdk.android.twitter.txt

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+# Twitter Core proguard configuration
+# '-include' this file in your proguard config
+# Autogenerated file -- Do not modify
+
+#Proguard Config for when AppCompat is not a dependency
+-dontwarn  com.digits.sdk.android.*ActionBarActivity
+
+# retrofit specific
+-dontwarn com.squareup.okhttp.**
+-dontwarn com.google.appengine.api.urlfetch.**
+-dontwarn rx.**
+-dontwarn retrofit.**
+-keepattributes Signature
+-keepattributes *Annotation*
+-keep class com.squareup.okhttp.** { *; }
+-keep interface com.squareup.okhttp.** { *; }
+-keep class retrofit.** { *; }
+-keepclasseswithmembers class * {
+    @retrofit.http.* <methods>;
+}

settings.gradle

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+include ':app'