如果你需要一个菜单来刷新一个特定片段中的webview，你可以使用:

片段:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

    // TODO Add your menu entries here
    inflater.inflate(R.menu.menu, menu);
    super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.exit:
        System.exit(1);
        break;

    case R.id.refresh:
        webView.reload();
        break;
    }
    return true;

}

menu。xml

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/exit" android:title="Exit" android:icon="@drawable/ic_action_cancel" />
    <item android:id="@+id/refresh" android:title="Refresh" android:icon="@drawable/ic_action_refresh" />
</menu>

除此之外，我还要补充一件事，以及它不适合我的原因。

这与Napster的答案相似。

Make sure your fragment's hosting activity extends AppCompatActivity, not FragmentActivity! public class MainActivity extends AppCompatActivity { } From the Google Reference Documentation for FragmentActivity: Note: If you want to implement an activity that includes an action bar, you should instead use the ActionBarActivity class, which is a subclass of this one, so allows you to use Fragment APIs on API level 7 and higher. To update Napster's answer -- ActionBarActivity now being deprecated, use AppCompatActivity instead. When using AppCompatActivity, also make sure you set "the activity theme toTheme.AppCompat or a similar theme" (Google Doc).

注意:android.support.v7.app。AppCompatActivity是android.support.v4.app的子类。FragmentActivity类(参见AppCompatActivity ref doc)。

在我的例子中，下面是步骤。

步骤1

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

    // Here notify the fragment that it should participate in options menu handling.
    setHasOptionsMenu(true);
}

步骤2

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // First clear current all the menu items
    menu.clear();

    // Add the new menu items
    inflater.inflate(R.menu.post_stuff, menu);

    super.onCreateOptionsMenu(menu, inflater);
}

步骤3

 @Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.post_stuff:
            Log.d(TAG, "Will post the photo to server");
            return true;
        case R.id.cancel_post:
            Log.d(TAG, "Will cancel post the photo");
            return true;
        default:
            break;
    }
    return super.onOptionsItemSelected(item);
}

在膨胀菜单之前，您需要使用menu.clear()。

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        menu.clear();
        inflater.inflate(R.menu.menu, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }

and

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

调用super方法:

Java:

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

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        // TODO Add your menu entries here
        super.onCreateOptionsMenu(menu, inflater);
    }

科特林：

    override fun void onCreate(savedInstanceState: Bundle) {
        super.onCreate(savedInstanceState)
        setHasOptionsMenu(true)
    }

    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        // TODO Add your menu entries here
        super.onCreateOptionsMenu(menu, inflater)
    }

在代码中放入日志语句，以查看是否没有调用该方法，或者您的代码是否没有修改菜单。

同时确保你在onCreate(Bundle)中调用sethasoptionmenu (boolean)来通知片段它应该参与选项菜单处理。

我也有同样的问题，我的片段是一个ViewPager的页面。发生这种情况的原因是我在实例化FragmentPagerAdapter时使用了子片段管理器而不是活动支持片段管理器。