proguard: fix release build

Prevents obfuscation of some symbols
to fix release builds by adding a custom proguard
configuration, based on Android optimised defaults.

* protect AIDL and SWIG symbols
* protect support library (uses reflexion)
* protect OrmLite (uses reflexion)

Tuleap: #128
Change-Id: Ie1fe8fa6af1a6968ca0889f8fe343e58a35071b6

ring-android/app/build.gradle

@@ -43,6 +43,7 @@ android {
     buildTypes {
         release {
             minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
     signingConfigs {

ring-android/app/proguard-project.txt

-# To enable ProGuard in your project, edit project.properties
-# to define the proguard.config property as described in that file.
-#
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in ${sdk.dir}/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the ProGuard
-# include property in project.properties.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}

ring-android/app/proguard-rules.pro

+-keepclassmembers class * {
+  public <init>(android.content.Context);
+}
+
+-keep class cx.ring.service.**
+-keepclassmembers class cx.ring.service.** { *; }
+
+#OrmLite uses reflection
+-keep class com.j256.**
+-keepclassmembers class com.j256.** { *; }
+-keep enum com.j256.**
+-keepclassmembers enum com.j256.** { *; }
+-keep interface com.j256.**
+-keepclassmembers interface com.j256.** { *; }
+
+# Keep the helper class and its constructor
+-keep class * extends com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper
+
+# Keep all model classes that are used by OrmLite
+# Also keep their field names and the constructor
+-keep @com.j256.ormlite.table.DatabaseTable class * {
+    @com.j256.ormlite.field.DatabaseField <fields>;
+    @com.j256.ormlite.field.ForeignCollectionField <fields>;
+    <init>();
+}