Android菜单横幅未显示

Question

我是Android新手，我在屏幕上显示菜单时出现问题。我不确定问题出在哪里，所以我在下面放了几个可能存在问题的文件。为了您的信息，该应用程序确实运行，它显示了ForecastFragment的一种方法中详述的虚拟数据列表，它只是没有显示菜单。

MainActivity.java

public class MainActivity extends FragmentActivity {

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

    if(savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new ForecastFragment()).commit();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.forecast_fragment, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_refresh) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

ForecastFragment.java

public class ForecastFragment extends Fragment {
private ArrayAdapter<String> data;

public ForecastFragment() {
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //statement below allows for fragment to handle menu interface
    setHasOptionsMenu(true);
}

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

public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_refresh) {
        FetchWeatherTask weatherTask = new FetchWeatherTask();
        weatherTask.execute("85383");
        return true;
    }
    return super.onOptionsItemSelected(item);
} [two more methods below which do not pertain to the menu]

menu_main.xml

<menu
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"
tools:context=".MainActivity">

<item android:id="@+id/action_settings"
    android:title="@string/action_settings"
    android:orderInCategory="100"
    app:showAsAction="never" />

forecast_fragment.xml

<?xml version="1.0" encoding="UTF-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
    android:title="@string/action_refresh"
    android:id="@+id/action_refresh"
    app:showAsAction="never"/>
</menu>

如果我还有forecast_fragment.xml，我不确定是否需要menu_main.xml，所以我想知道其中一个是无关的，是否可以删除其中一个文件。感谢任何可以提供帮助的人。