Fix #97 Making apk with undesired filename, a special case

Author: scopeInfinity

source-code/app/src/main/java/org/buildmlearn/toolkit/utilities/SignerThread.java

@@ -48,13 +48,18 @@ public SignerThread(Context context, String assetsApk, String finalApk, KeyStore
         this.projectFile = finalApk;
         this.context = context;
         this.assetsApk = assetsApk;
-        this.finalApk = finalApk.replaceAll("buildmlearn", "apk");
+        this.finalApk = getFinalApkPath(finalApk);
         this.keyDetails = keyDetails;
         this.toolkit = (ToolkitApplication) context;
         this.assetFileName = assetFileName;
         this.assetFilePath = assetFilePath;
     }
 
+    private String getFinalApkPath(String buildmlearnPath) {
+        int index = buildmlearnPath.lastIndexOf("buildmlearn");
+        return buildmlearnPath.substring(0,index) + "apk";
+    }
+
     public void setSignerThreadListener(OnSignComplete listener) {
         this.listener = listener;
     }