code: protected String extractPackageNameFromAndroidManifestXmlTree( String aaptDumpXmlTree )
      {
          final Scanner scanner = new Scanner( aaptDumpXmlTree );
          // Finds the root element named "manifest".
          scanner.findWithinHorizon( "^E: manifest", 0 );
          // Finds the manifest element's attribute named "package".
          scanner.findWithinHorizon( "  A: package=\"", 0 );
          // Extracts the package value including the trailing double quote.
          String packageName = scanner.next( ".*?\"" );
          // Removes the double quote.
          packageName = packageName.substring( 0, packageName.length() - 1 );
          return packageName;
      }
docs: Extracts the package name from an XmlTree dump of AndroidManifest.xml by the <code>aapt</code> tool.
  
  @param aaptDumpXmlTree output from <code>aapt dump xmltree &lt;apkFile&gt; AndroidManifest.xml
  @return the package name from inside the apkFile.