private static interface Command {
    public void execute();
}

public static final class MyWsCommand1 implements Command {
    @Override
    public void execute() {
        // TODO your WS code 1
    }
}

public static final class MyWsCommand2 implements Command {
    @Override
    public void execute() {
        // TODO your WS code 2
    }
}

private static class GenericAsyncTask<Params, Progress, Result> extends AsyncTask<Params, Progress, Result> {

    private Command command;

    public GenericAsyncTask(Command command) {
        super();
        this.command = command;
    }

    @Override
    protected Result doInBackground(Params... params) {
        // TODO your code
        command.execute();
        // TODO your code
        return null;
    }

}

private GenericAsyncTask<Object, Object, Object> myAsyncTask1;
private GenericAsyncTask<Object, Object, Object> myAsyncTask2;

myAsyncTask1 = new GenericAsyncTask<Object, Object, Object>(new MyWsCommand1());
    myAsyncTask1.execute();

myAsyncTask2 = new GenericAsyncTask<Object, Object, Object>(new MyWsCommand2());
    myAsyncTask2.execute();