Correct find and replace typo

Author: ReallySmallSoftware

scripts/android/afterPluginInstall.js

@@ -34,7 +34,7 @@ module.exports = function(context) {
         manifestRoot = manifest['manifest'];
         packageName = manifestRoot['$']['package'];
 
-        newActivity = activity.replace('${mypackage}', packageName);
+        newActivity = activity.replaceAll(/\$\{mypackage\}/g, packageName);
         newActivityPath = utilities.getAndroidSourcePath(context) + "/" + packageName.replaceAll("\\.", "/") + '/MainActivity.java';
 
         console.log(newActivityPath);

src/android/MainActivity.java

@@ -49,12 +49,12 @@ public void onCreate(Bundle savedInstanceState)
 
         FragmentManager fm = getSupportFragmentManager();
 
-        currentFragment = (CordovaFragment) fm.findFragmentByTag("${mypackage}");
+        currentFragment = (uk.co.reallysmall.cordova.plugin.fragment.CordovaFragment) fm.findFragmentByTag("${mypackage}");
 
         if (currentFragment == null) {
             currentFragment = new uk.co.reallysmall.cordova.plugin.fragment.CordovaFragment();
             FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
-            ft.add(android.R.id.content, currentFragment,${mypackage});
+            ft.add(android.R.id.content, currentFragment,"${mypackage}");
             ft.commit();
         }
     }