onOptionsItemSelected() 方法不会在 Fragment 上调用

Posted 2023-04-19

【中文标题】onOptionsItemSelected() 方法不会在 Fragment 上调用

【英文标题】：onOptionsItemSelected() method not get called on Fragment

【发布时间】：2019-04-20 14:24:01

【问题描述】：

我有一个 AppCompatActivity 和一些片段。操作栏上的后退按钮在AboutFragment 中不起作用。

Activity 没有扩展菜单，而 Fragment 在操作栏中只有一个后退按钮。

片段菜单可见，但点击后退按钮时完全没有反应。

点击操作栏中的信息图标会显示AboutFragment。

单击i 图标时，下面的方法在MainActivity 内部起作用。

 @Override
    public void onInfoSelected() 

        abf = (AboutFragment) getSupportFragmentManager().findFragmentByTag(ABOUT_FRAGMENT_TAG);

        FragmentTransaction ft = fm.beginTransaction();
        ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right,
                android.R.anim.slide_in_left, android.R.anim.slide_out_right);
       // ft.hide(pf);

        //ft.hide(cf);
        ft.hide(tlf);
        ft.show(abf);
        ft.addToBackStack(null);
        ft.commit();
    

那么 AboutFragment 内的后退按钮不会调用 Fragment 内的onOptionsItemSelected() 方法。

调试时，我可以看到 Fragment 和 Activity 的 onCreateOptionsMenu() 都被调用，但是当点击按钮时，没有 onOptionsItemSelected() 被调用，既不是来自 Activity，也不是来自 Fragment。

我搜索和谷歌搜索已经两天了，对我没有任何帮助。 任何帮助都会得到帮助。

活动 Java 代码

package me.declangao.jiasazsales.app;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import me.declangao.jiasazsales.R;
import me.declangao.jiasazsales.model.Post;

public class MainActivity extends AppCompatActivity implements
        RecyclerViewFragment.PostListListener, PostFragment.PostListener,
        TabLayoutFragment.TabLayoutListener, SearchResultFragment.SearchResultListener,
        CommentFragment.CommentListener,AboutFragment.AboutListener 

    private static final String TAG = MainActivity.class.getSimpleName();
    public static final String TAB_LAYOUT_FRAGMENT_TAG = "TabLayoutFragment";
    public static final String POST_FRAGMENT_TAG = "PostFragment";
    public static final String COMMENT_FRAGMENT_TAG = "CommentFragment";

    public static final String ABOUT_FRAGMENT_TAG = "AboutFragment";


    private FragmentManager fm = null;
    private TabLayoutFragment tlf;
    private PostFragment pf;
    private CommentFragment cf;
    private SearchResultFragment srf;
    private AboutFragment abf;


    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);



        fm = getSupportFragmentManager();

        // Setup fragments
        tlf = new TabLayoutFragment();
        pf = new PostFragment();
        cf = new CommentFragment();
        srf = new SearchResultFragment();
        abf=new AboutFragment();
        FragmentTransaction ft = fm.beginTransaction();
        ft.add(android.R.id.content, abf, ABOUT_FRAGMENT_TAG);
        ft.add(android.R.id.content, pf, POST_FRAGMENT_TAG);
        ft.add(android.R.id.content, cf, COMMENT_FRAGMENT_TAG);
        ft.add(android.R.id.content, tlf, TAB_LAYOUT_FRAGMENT_TAG);


        ft.hide(pf);
        ft.hide(cf);
        ft.hide(abf);
        ft.show(tlf);
        ft.commit();
    

    /**
     * Invoked when a post in the list is selected
     *
     * @param post Selected Post object
     */
    @Override
    public void onPostSelected(Post post, boolean isSearch) 
        // Find the fragment in order to set it up later
        pf = (PostFragment) getSupportFragmentManager().findFragmentByTag(POST_FRAGMENT_TAG);

        // Set necessary arguments
        Bundle args = new Bundle();
        args.putInt("id", post.getId());
        args.putString("title", post.getTitle());
        args.putString("date", post.getDate());
        args.putString("author", post.getAuthor());
        args.putString("content", post.getContent());
        args.putString("url", post.getUrl());
        //args.putString("thumbnailUrl", post.getThumbnailUrl());
        args.putString("featuredImage", post.getFeaturedImageUrl());

        // Configure PostFragment to display the right post
        pf.setUIArguments(args);

        // Show the fragment
        FragmentTransaction ft = fm.beginTransaction();
        ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right,
                android.R.anim.slide_in_left, android.R.anim.slide_out_right);
        if (!isSearch)  // Hide TabLayoutFragment if this is not search result
            ft.hide(tlf);

         else  // Otherwise, hide the search result, ie. SearchResultFragment.
            ft.hide(srf);
        
        ft.show(pf);
        ft.addToBackStack(null);
        ft.commit();
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
        switch (item.getItemId()) 
            case android.R.id.home:
                //do something here like
Log.e("menu Test","rom Main activity");
                int backStackEntryCount
                        =getSupportFragmentManager().getBackStackEntryCount();

                if (backStackEntryCount > 0) 

                    getSupportFragmentManager().popBackStack();

                

                return true;
        
        return false;
    
    /**
     * Invoked when a search query is submitted
     *
     * @param query Selected Post object
     */
    @Override
    public void onSearchSubmitted(String query) 
        FragmentTransaction ft = fm.beginTransaction();
        ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right,
                android.R.anim.slide_in_left, android.R.anim.slide_out_right);

        // Send query to fragment using factory method
        srf = SearchResultFragment.newInstance(query);
        ft.add(android.R.id.content, srf);
        ft.hide(tlf);
        ft.addToBackStack(null);
        ft.commit();
    


    @Override
    public void onInfoSelected() 

        abf = (AboutFragment) getSupportFragmentManager().findFragmentByTag(ABOUT_FRAGMENT_TAG);

        FragmentTransaction ft = fm.beginTransaction();
        ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right,
                android.R.anim.slide_in_left, android.R.anim.slide_out_right);
       // ft.hide(pf);

        //ft.hide(cf);
        ft.hide(tlf);
        ft.show(abf);
        ft.addToBackStack(null);
        ft.commit();
    
    /**
     * Invoked when comment menu is selected
     *
     * @param id ID of the article, assigned by WordPress
     */
    @Override
    public void onCommentSelected(int id) 
        cf = (CommentFragment) getSupportFragmentManager().findFragmentByTag(COMMENT_FRAGMENT_TAG);
        Bundle args = new Bundle();
        args.putInt("id", id);
        // Setup CommentFragment to display the right comments page
        cf.setUIArguments(args);

        FragmentTransaction ft = fm.beginTransaction();
        ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right,
                android.R.anim.slide_in_left, android.R.anim.slide_out_right);
        ft.hide(pf);
        //ft.hide(abf);
        ft.show(cf);
        ft.addToBackStack(null);
        ft.commit();
    

    /**
     * Intercept back button event, reset ActionBar if necessary
     */
    @Override
    public void onBackPressed() 
        resetActionBarIfApplicable();
        super.onBackPressed();
    

    /**
     * Simulate a back button press when home is selected
     */
    @Override
    public void onHomePressed() 
        resetActionBarIfApplicable();
        fm.popBackStack();
    

    /**
     * Reset TabLayoutFragment's ActionBar if necessary
     */
    private void resetActionBarIfApplicable() 
        Log.d(TAG, "SearchResultFragment is visible: " + srf.isHidden());
        if (srf.isVisible()) 
            tlf.resetActionBar();
        
    

    // Commented out coz we will let fragments handle their own Options Menus
/*
    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        //Log.e("Erroraaa","aaaaa");

        return true;
    



    @Override
    public boolean onOptionsItemSelected(MenuItem item) 

        Log.e("menu","activity: action home has clicked");
        switch (item.getItemId())
            case android.R.id.home:

                onBackPressed();
                return false;

        

        return super.onOptionsItemSelected(item);
    
*/

关于片段

 package me.declangao.jiasazsales.app;

import android.app.Activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import me.declangao.jiasazsales.R;

/**
 * Fragment to display a Info about Jiasaz company.
 * Activities that contain this fragment must implement the
 * @link AboutFragment.AboutListener interface
 * to handle interaction events.
 */
public class AboutFragment extends Fragment 



    private AboutListener mListener;
    private Toolbar toolbar;


    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        this.setRetainInstance(true);

        this.setHasOptionsMenu(true);

    

//    @Override
//    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) 
//        Log.e("Menu:created","Menu");
//
////        super.onCreateOptionsMenu(menu, inflater);
////        menu.clear();
//        inflater.inflate(R.menu.menu_post, menu);
//        super.onCreateOptionsMenu(menu, inflater);
//    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
        Log.e("Menu:selected","Menu");
        if (item.getItemId() == android.R.id.home) 
            mListener.onHomePressed();
        
        return false;
    


    public AboutFragment() 
        // Required empty public constructor
    

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

        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.about_layout, container, false);

        toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
        ((MainActivity) getActivity()).setSupportActionBar(toolbar);
        ((MainActivity) getActivity()).getSupportActionBar().setHomeButtonEnabled(true);
        ((MainActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        ((MainActivity) getActivity()).getSupportActionBar().setTitle(  "www.Jiasaz.com");
         Log.e("Menu: fragment created","onCreaate()");

        return rootView;
    

    @Override
    public void onAttach(Activity activity) 
        super.onAttach(activity);
        try 
            mListener = (AboutListener) activity;
         catch (ClassCastException e) 
            throw new ClassCastException(activity.toString()
                    + " must implement AboutListener");
        
    

    @Override
    public void onDetach() 
        super.onDetach();
        mListener = null;
    

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p/>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface AboutListener 
       void onHomePressed();
        //void onInfoSelected();
    

这是我的 AboutFragment xml 代码

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    android:background="@color/colorAccent"
    android:layoutDirection="rtl"
    android:textDirection="rtl"

    tools:context="me.declangao.jiasazsales.app.AboutFragment">

    <LinearLayout
        android:layout_
        android:layout_
        android:layoutDirection="rtl"
        android:textDirection="rtl"
        android:orientation="vertical">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_
            android:layout_
            android:background="@color/colorPrimary"
            android:theme="@style/ThemeOverlay.AppCompat.Dark"
            android:layoutDirection="rtl"
            android:textDirection="rtl"
            />

    <LinearLayout
        android:layout_
        android:layout_
        android:layoutDirection="rtl"
        android:textDirection="rtl"
        android:padding="15dp"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView2"
            android:layout_
            android:layout_
            android:layout_marginTop="20dp"
            android:layout_marginBottom="10dp"
            android:text="ئه‌م ئاپه‌ له‌لایه‌ن كۆمپانیای جیاساز دروست كراوه‌"
            android:textAppearance="@style/TextAppearance.AppCompat.Light.SearchResult.Title" />

        <ImageView
            android:id="@+id/imageView"
            android:layout_
            android:layout_
            android:src="@drawable/jiasazlogo" />

        <TextView
            android:id="@+id/textView"
            android:layout_
            android:layout_
            android:layout_marginTop="20dp"
            android:layout_marginBottom="10dp"
            android:text="كۆمپانیای جیاساز بۆ خزمه‌تگوزاری و چاره‌سه‌ری ته‌كنه‌لۆجی، دروستكردنی وێبسایت و ئاپی مۆبایل و سیسته‌می دام و ده‌زگاكان و ماركێته‌كان"
            android:textAppearance="@style/TextAppearance.AppCompat.Light.SearchResult.Title" />

        <TextView
            android:id="@+id/textView3"
            android:layout_
            android:layout_
            android:layout_gravity="center_horizontal"
            android:autoLink="all"
            android:clickable="true"
            android:text="@string/link"
            android:textAlignment="center"
            android:textAppearance="@style/TextAppearance.AppCompat.Body1"
            android:textSize="18sp" />

    </LinearLayout>
    </LinearLayout>

</FrameLayout>

【参考方案1】：

您可以直接在Toolbar 上设置OnMenuItemClickListener 的实例。请记住，您不应使用 Activity.setSupportActionBar(Toolbar)。

public class AboutFragment extends Fragment 

    // ...

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

        View rootView = inflater.inflate(R.layout.about_layout, container, false);
        toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);

        toolbar.inflateMenu(R.menu.menu_about_fragment);
        toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() 

            @Override
            public boolean onMenuItemClick(MenuItem item) 
                if (item.getItemId() == R.id.some_menu) 
                    // do sth...
                    return true; // event is handled.
                
                return false;
            
        );

        // ...
    

    // ...

.

2018 年 11 月 21 日更新：

要为独立的Toolbar 启用后退按钮，请使用app:navigationIcon="?attr/homeAsUpIndicator" 在xml 文件中设置其默认图标：

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_
    android:layout_
    android:background="@color/colorPrimary"
    android:theme="@style/ThemeOverlay.AppCompat.Dark"
    android:layoutDirection="rtl"
    android:textDirection="rtl"
    app:navigationIcon="?attr/homeAsUpIndicator" />

然后为它设置一个监听器

toolbar.setNavigationOnClickListener(new View.OnClickListener() 

    @Override
    public void onClick(View v) 
        // back button is pressed
        mListener.onHomePressed();
    
);

【讨论】：

你在toolbar.setOnMenuItemClickListener之后打电话给setSupportActionBar(toolbar)吗？

不，我打电话给setSupportActionBar(toolbar) 然后`toolbar.setOnMenuItemClickListener`

尽量不要使用setSupportActionBar，然后测试更新的解决方案。

我的应用程序崩溃了

请查看github.com/aminography/FragmentToolbar并与您自己的比较。

【参考方案2】：

您正确地描述了所有内容，这些都是平台的限制。要解决它，您需要使用 onOptionsItemSelected() 在 MainActivity 中，插入您已在其他方法中使用的代码：

abf = (AboutFragment) getSupportFragmentManager().findFragmentByTag(ABOUT_FRAGMENT_TAG);

然后，当您拥有片段时，您可以从片段中调用一些方法，并可能获取返回值以了解是否处理了背面以及是否需要做更多的事情......

【讨论】：

如您所见，调用的是 Activity onOptionsItemSelected()。它包含有关菜单项 ID 的信息。由于 id 是唯一的，您可以知道发生了什么，无论是来自活动还是片段。如果您需要在片段中处理它，您可以使用上面的代码。所以这行得通，我不确定你到底想说什么，从理论上讲这可能并不完美，但这是使它工作的方法，因为 SDK 没有按预期工作。

我什至无法对活动onOptionsItemSelected() 进行操作，它在任何地方都没有显示任何操作

【参考方案3】：

您可以在片段类中使用onPrepareOptionsMenu(Menu menu) 来收听您的操作栏菜单...

@Override
public void onPrepareOptionsMenu(Menu menu)

    super.onPrepareOptionsMenu(menu);

    // to get an item of menu from action bar you can do it like...
    // this below line will find an item of menu with id action_search...
    MenuItem searchMenuItem = menu.findItem(R.id.action_search);

    // like this you can find other menu items
    // another example is
    MenuItem infoMenuItem = menu.findItem(R.id.action_info);

我实际上在片段类中使用搜索视图进行搜索...

【讨论】：

这在点击菜单项时不起作用，它只在片段启动时起作用

【参考方案4】：

第一个原因是您没有在Activity 中正确实现onCreateOptionsMenu() 和onOptionsItemSelected() @Override 方法，所以取消注释Activity 也可以调用它们各自的super 方法。

第二个原因是你的onCreateOptionsMenu()代码被注释了，需要not。重要的是必须调用超级super.onCreateOptionsMenu(menu, inflater);来绘制Fragment的菜单

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) 
    super.onCreateOptionsMenu(menu, inflater);

并将Fragment 中的onOptionsItemSelected() 更改为：

@Override
public boolean onOptionsItemSelected(MenuItem item) 
    Log.e("Menu:selected","Menu");
    if (item.getItemId() == android.R.id.home) 
        mListener.onHomePressed();
        return true;
    else
        return super.onOptionsItemSelected(item);
    

现在在Activity 中将您的onCreateOptionsMenu() 更改为：

@Override
    public boolean onCreateOptionsMenu(Menu menu) 
        return super.onCreateOptionsMenu(menu);
    

和onOptionsItemSelected()这个：

@Override
public boolean onOptionsItemSelected(MenuItem item) 
    return super.onOptionsItemSelected(item);

【讨论】：

感谢您的回复，如果您检查问题，我已经这样做了。

测试了一下，和以前一样，什么也没发生，onCreateOptionsMenu被调用了，但问题是onOptionsItemSelected()永远不会被调用。

@rabarkareem 还取消注释活动onCreateOptionsMenu 和onOptionsItemSelected 及其各自的supers。再次更新答案请在各个类中替换上述给定方法并尝试

还是不行，要不要我把源代码发给你？