question: @ Override public String dumpWindowHierarchy ( boolean compressed ) { device . setCompressedLayoutHeirarchy ( compressed ) ; try { ByteArrayOutputStream os = new ByteArrayOutputStream ( ) ; device . dumpWindowHierarchy ( os ) ; os . close ( ) ; return os . toString ( "UTF-8" ) ; } catch ( FileNotFoundException e ) { e . printStackTrace ( ) ; } catch ( IOException e ) { e . printStackTrace ( ) ; } finally { device . setCompressedLayoutHeirarchy ( false ) ; } return null ; }
target:  Helper method used for debugging to dump the current window's layout hierarchy.