Android: Help create progress bar while injecting sql

I am doing some injections to sql, about a hundred on first launch. it doesn't take that long but i want a progress bar while the app is injecting data.

This is my code but progress bar doesn't appear, only black screen.

SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
        boolean firstStart = settings.getBoolean("firstStart", tru开发者_如何学编程e);        

        if(firstStart) {                  
         ProgressDialog dialog = ProgressDialog.show(myInject.this, "", "Please wait.", true);

            addInjection("The quick brown fox"); // about a hundred of these injections

SharedPreferences.Editor editor = settings.edit();
         editor.putBoolean("firstStart", false);
         editor.commit();

         dialog.dismiss(); //if i remove this i can see the progress dialog but wont close.
}

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You will be running the operation on the UI Thread doing it this way. Take a look at running the 'inject' code within an AsyncTask

It's worth having a read up on the developer site about not running tasks on the UI Thread.