Question

我正在创建一个Android应用程序，我需要放回导航，这样当用户点击操作栏的主页按钮时，用户应该移到我的app上的一个屏幕上。但是操作栏主页按钮没有响应点击事件。这是我的代码。

public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }
            @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);

        ActionBar actionBar = getActivity().getActionBar();
        actionBar.setHomeButtonEnabled(true);
        actionBar.setDisplayHomeAsUpEnabled(true);


        return rootView;
    } }

public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
    case R.id.home:
        Toast.makeText(getApplication(), "Back", Toast.LENGTH_LONG).show();

        break;

    default:
        break;
    }
    return super.onOptionsItemSelected(item);
}

Answer 1

case android.R.id.home:

尝试使用此代替case R.id.home:

Answer 2

使用android.R.id.home代替R.id.home

public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
    case android.R.id.home:
        Toast.makeText(getApplication(), "Back", Toast.LENGTH_LONG).show();

        break;

    default:
        break;
    }
    return super.onOptionsItemSelected(item);
}

Actionbar后退按钮在android中不起作用

2 个答案: