Question

how can I trigger AsyncTasks that are contained in another activity from my main activity?

public class DatabaseActivity extends Activity {
    private class DbReader extends AsyncTask<..> {
        @Override
        protected List<MyData> doInBackground(..) {
            //execute query etc
        }
    }

    private class DbSaver extends AsyncTask<..> {
        @Override
        protected void doInBackground(MyData data) {
            //save to dn
        }
    }

    private class DbRemover extends AsyncTask<..> {
        @Override
        protected void doInBackground(MyData data) {
            //remove in db
        }
    }
}

How can I trigger from MyApplication extends Actitivy?

Answer 1

i think you should use seperate class where AsyncTask is alone.

when your app needs more than one AsyncTask then you should use seperate AsyncTask and call it.

private class CommonTask extends AsyncTask<..> {
   public CommonTask(Foo foo){

       } 

        @Override
        protected void doInBackground(MyData data) {
            //remove in db
        }
    }

No you can pass diffrent value for constructor and check what you want from Activity either data save or remove or anything else…