Question

所以，我最近参与了片段并学习了如何使用buttonClick来回调和与活动进行通信。直到最近，我一直在使用我的回调执行单一功能。但现在，我想用它执行不止一种活动。基本上，回调'itemListener用于切换从左到右动画的片段。现在引入了另一个按钮，以相反的方向切换片段，因此任何有关如何执行此操作的建议都将非常感激。这是我的代码：

public class ExamFragment extends Fragment{
    private static OnItemClickedListener sDummyCallbacks = new OnItemClickedListener() {
        @Override
        public void OnItemClicked(Parameters params) {

        }
    };
    OnItemClickedListener mListener = sDummyCallbacks;

    private Button nextButton, prevButton;

    // firstly, create the interface
        public interface OnItemClickedListener {
            public void OnItemClicked(Parameters params);
        }

        //To ensure that the host activity implements the interface
        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
            try {
                mListener = (OnItemClickedListener) activity;
            } catch (ClassCastException e) {
                throw new ClassCastException(activity.toString() + " must implement OnItemClickedListener");
            }
        }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.activity_exam_fragment, container,
            false);

    nextButton = (Button) view.findViewById(R.id.nextButton);
    prevButton = (Button) view.findViewById(R.id.prevButton);

    nextButton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            mListener.OnItemClicked(null);
            ++num;
        }

    });

    prevButton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            mListener.OnItemClicked(null);
            --num;
        }

    });




    return view;
    }

这是我的活动

public class ExamActivity extends Activity implements ExamFragment.OnItemClickedListener{

    Fragment my = new ExamFragment();
    private int time;
    private boolean timerHasStarted = false;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_exam);
        lockRotation();

        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        transaction.replace(R.id.your_placeholder, my);
        transaction.commit();




 }

    @Override
    public void OnItemClicked(Parameters recieveparams) {
        my = new ExamFragment();


                            FragmentTransaction transaction = getFragmentManager().beginTransaction();
                            transaction.setCustomAnimations(R.animator.enter_anim, R.animator.exit_anim);
                            transaction.replace(R.id.your_placeholder, my);
                            transaction.addToBackStack(null);
                            transaction.commit();

                }


    }

下一个按钮执行代码中显示的动画，但前一个按钮意味着在相反的方向上执行，引入静态变量可以帮助我确定单击了哪个按钮，但我不喜欢静态，我觉得这是一个更好的方法。对不起，如果我的问题仍然太模糊。

如何使用单个片段回调执行多个操作

0 个答案: