android - 操作栏检测 fragment 中的后退按钮单击

Question

我有一个 fragment ，其中启用了操作栏后退按钮。

代码 :

@Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        setHasOptionsMenu(true);
        actionBar = ((MainActivity)getActivity()).getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);

        actionBar.setCustomView(R.layout.custom_action_bar);
        actionBar.setDisplayShowTitleEnabled(false);
        actionBar.setDisplayShowCustomEnabled(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = mInflater.inflate(R.layout.fragment_layout, container, false);

        return view;
    }

上述代码中 actionBar.setDisplayHomeAsUpEnabled(true);启用操作栏中的后退按钮，但我们如何检测对它的点击？

我查看了许多示例并尝试了以下但仍然无法正常工作:

在 fragment 中:

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            Toast.makeText(getActivity(), "Back", Toast.LENGTH_LONG).show();
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

fragment 中显示的后退按钮也是黑色的，我需要白色或自定义颜色的按钮，我该如何更改？

Answer 1

迟到总比没有好，请试试这个>

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = mInflater.inflate(R.layout.fragment_layout, container, false);
        //set setHasOptionsMenu on true here on CreateView method
        setHasOptionsMenu(true);
        return view;
    }

并实现

@Override
public boolean onOptionsItemSelected(MenuItem item){
            if (item.getItemId() == android.R.id.home) {
                if (getActivity() != null) {
                    getActivity().onBackPressed();
                }
                return true;
            };
            return super.onOptionsItemSelected(item);
 }