java - Database clear each time my application runs -

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does know how reset database everytime application executes in real device ?

i have code not work... 

public void dodbcheck()     {         try{                 file file = new file(context.getexternalfilesdir(null).getabsolutepath());                 file.delete();         }catch(exception ex)         {             }         }

any solutions ?

public void cleardatabase() { sqlitedatabase db = helper.getwritabledatabase(); db.delete({tablename},null,null) // write line each table in db. }

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