add ability to build a second variant. Works, but they can't both be

installed because of duplicate permissions.

xwords4/android/XWords4/app/build.gradle

@@ -4,6 +4,9 @@ def CHAT_ENABLED = true
 def THUMBNAIL_ENABLED = true
 def LIBS_DEBUG = 'libs-debug'
 def LIBS_RELEASE = 'libs-release'
+def VERSION_CODE_BASE = 1
+def VARIANTS = [ "Xw4", "Xw4dbg" ]
+def BUILDS = [ "Debug", "Release" ]
 
 apply plugin: 'com.android.application'
 
@@ -15,7 +18,6 @@ android {
     compileSdkVersion 22
     buildToolsVersion "22.0.1"
     defaultConfig {
-        applicationId "org.eehouse.android.xw4"
         minSdkVersion 7
         targetSdkVersion 14
     }
@@ -23,29 +25,40 @@ android {
     // Rename all output artifacts to include version information
     // applicationVariants.all { variant ->
     //     renameArtifact(variant)
+    //     variant.buildConfigField "String", "FIELD_NAME", "\"my String\""
     // }
     
-    // flavorDimensions "variant", "abi"
+    flavorDimensions "variant"//, "abi"
-    // productFlavors {
+    productFlavors {
-    //     xw4 {
+        xw4 {
-    //         dimension "variant"
+            dimension "variant"
+            applicationId "org.eehouse.android.xw4"
+        }
+        xw4dbg {
+            dimension "variant"
+            applicationId "org.eehouse.android.xw4dbg"
+        }
+
+        // WARNING: "all" breaks things. Seems to be a keyword. Need
+        // to figure out how to express include-all-abis
+        // all {
+        //     dimension "abi"
+        //     versionCode 0 + VERSION_CODE_BASE
         // }
-    //     xw4dbg {
+        // armeabi {
-    //         dimension "variant"
+        //     dimension "abi"
+        //     versionCode 1 + VERSION_CODE_BASE
+        // }
+        // x86 {
+        //     dimension "abi"
+        //     versionCode 2 + VERSION_CODE_BASE
         // }
         // armeabiv7a {
         //     dimension "abi"
+        //     versionCode 3 + VERSION_CODE_BASE
         // }
         
-    //     armeabi {
+    }
-    //         dimension "abi"
-    //     }
-
-    //     x86 {
-    //         dimension "abi"
-    //     }
-        
-    // }
 
     signingConfigs {
         release {
@@ -154,8 +167,12 @@ task mkXml(type: Exec) {
 }
 
 afterEvaluate {
-    compileReleaseNdk.dependsOn ndkBuildRelease
+    VARIANTS.each { VARIANT ->
-    compileDebugNdk.dependsOn ndkBuildDebug
+        String compileTask = "compile${VARIANT}ReleaseNdk"
+        tasks.getByName(compileTask).dependsOn ndkBuildRelease
+        compileTask = "compile${VARIANT}DebugNdk"
+        tasks.getByName(compileTask).dependsOn ndkBuildDebug
+    }
 }
 
 task askForPassword << {