Contents Background Motivation Design and the algorithms of Simply Droid The Overall Design Grouping Events with GUI State Hierarchy Tree The HDd algorithm The BHDD Algorithm The LhDD Algorithm )Experiments and results analysis Related Work conclusion future workContents 2  Background  Motivation  Design and the Algorithms of SimplyDroid  The Overall Design  Grouping Events with GUI State Hierarchy Tree  The HDD Algorithm  The BHDD Algorithm  The LHDD Algorithm  Experiments and Results Analysis  Related Work  Conclusion & future work