Odtnhj

I am using android Room and I have a boolean method that querys a DB through an Executor to see if an ID provided by the user is already used. everything works fine but sometimes the ansewer from the DB call arrives to late to the main thread meaning that my code doesnt know if the id is new or old. I want to make the code in the method wait until the runOnUiThread inside the executor has delivered a result for the rest of the method to work with.

//check id validity with two different error messages
 int isNew=-1;
 void setIsNewId(int result)
 isNew=result;
 
 private boolean checkId()
 String id=mId.getText().toString().trim();


 try
 final int parseId=Integer.parseInt(id);

 AppExecutors.getInstance().diskIO().execute(new Runnable() 
 @Override
 public void run() 
 final int result=mDb.clientDao().isIdNew(parseId);
 runOnUiThread(new Runnable() 
 @Override
 public void run() 
 setIsNewId(result);//<--THIS ARRIVES TOO LATE TO MAIN THREAD

 
 );
 
 );

 //THIS SHOULD WAIT UNTIL RESULT IS AVAILABLE
 if (isNew==1 && !id.isEmpty())
 ilId.setErrorEnabled(false);
 return true;
 else if(isNew==0)
 ilId.setErrorEnabled(true);
 ilId.setError("Id has to be new");
 mId.setError("Id needs to be new");
 Toast.makeText(this,"Id needs to be new", Toast.LENGTH_LONG).show();
 return false;
 else
 Toast.makeText(this,"its taking too long", Toast.LENGTH_LONG).show();
 return false;
 

 catch(Exception e)
 ilId.setErrorEnabled(true);
 ilId.setError("Id has to be numeric");
 mId.setError("Id has to be numeric");
 Toast.makeText(this,"Id needs to be numeric", Toast.LENGTH_LONG).show();
 return false;
 
 

I have already tried synchronizing on an object, using a mutex, a CountDownLatch,a sleep call. but all seem to freeze my UI and make my App crash. I know that executors have a submit() method but I have not been able to find an example about how to use it in the context of my nested thread. I am rather new to android and this is my first encounter with synchronization issues. maybe the solution is simple and i am just doing something wrong. any help is much appreciated