Question

我正在为Android应用程序创建搜索页面。我想在某种模式中添加一些搜索过滤器，互联网上的建议说我应该使用带有片段的AlertDialog来显示我的自定义过滤器。我已设法在对话框中显示片段，但未调用与片段相关的代码（如onCreate）。当我直接在一个活动中使用片段时，会调用onCreate，但不会在AlertDialog加载它时调用它。有什么我做错了或者我应该采取另一种方式吗？

这是用于打开对话框的代码

SearchFilterDialogFragment dialog = new SearchFilterDialogFragment();
            FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
            Fragment prev = getFragmentManager().findFragmentByTag("dialog");
            if (prev != null) {
                fragmentTransaction.remove(prev);
            }
            fragmentTransaction.addToBackStack(null);
            dialog.show(fragmentTransaction,"dialog");

这是对话框配置的代码

public class SearchFilterDialogFragment extends DialogFragment {

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    // Use the Builder class for convenient dialog construction
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    LayoutInflater inflater = getActivity().getLayoutInflater();

    builder.setView(inflater.inflate(R.layout.fragment_blank,null)).setTitle("Search Filters")
            .setPositiveButton(R.string.filter_dialogue_ok, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // FIRE ZE MISSILES!
                }
            })
            .setNegativeButton(R.string.filter_dialogue_cancel, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // User cancelled the dialog
                }
            });

    return builder.create();



}

这是最终会在其中包含实际过滤器的测试片段

public class BlankFragment extends Fragment {



public BlankFragment() {
    // Required empty public constructor
}


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_blank, container, false);
}

}

Answer 1

DialogFragment 片段。它管理Fragment生命周期。 BlankFragment中你想要的一切都应该在SearchFilterDialogFragment中。你不需要BlankFragment。

回答你的问题，为什么BlankFragment的代码没有被调用，它是因为根本没有引用或实例化BlankFragment。代码：

builder.setView(inflater.inflate(R.layout.fragment_blank,null))

将fragment_blank布局扩展到DialogFragment，但它不启动BlankFragment代码。

使用自定义setView正确使用DialogFragment ：

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    //Set all the title, button etc. for the AlertDialog
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("Search Filters");

    //Get LayoutInflater
    LayoutInflater inflater = getActivity().getLayoutInflater();

    //Inflate the layout but ALSO store the returned view to allow us to call findViewById
    View view = inflater.inflate(R.layout.fragment_blank,null);

    //Do all the initial code regarding the view, as you would in onCreate normally
    view.findViewById(R.id.some_view);

    //Finally, give the custom view to the AlertDialog builder
    builder.setView(view);
}

警报对话框中的Android Fragment

1 个答案: