Question

我有一个带有搜索图标的操作栏，按下时会加载一个名为搜索的新片段。加载此片段时，我希望顶部的搜索栏展开并打开键盘，以便用户可以键入和搜索。我的onCreateOptionsMenu看起来像这样：

@Override
    public void onCreateOptionsMenu (Menu menu, MenuInflater inflater) {
        // Inflate the menu; this adds items to the action bar if it is present.

        Log.d("click" , "inside the on create");

        getActivity().getMenuInflater().inflate(R.menu.main, menu);
        SearchView searchView = (SearchView) menu.findItem(R.id.menu_search2).getActionView();
        searchView.setIconified(false);
        searchView.setOnQueryTextListener(this);
    }

片段的所有代码都是：

import android.app.Fragment;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
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 android.widget.ListView;
import android.widget.SearchView;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

/**
 * Created by Mike on 2/13/14.
 */

public class Search extends Fragment implements SearchView.OnQueryTextListener {

    private ListView lv;
    View v;

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

        //set layout here
        v = inflater.inflate(R.layout.activity_search, container, false);


        //get user information
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String userName = prefs.getString("userName", null);
        String userID = prefs.getString("userID", null);


        //todo: code body goes here





        // Inflate the layout for this fragment
        return v;


}


    @Override
    public void onCreateOptionsMenu (Menu menu, MenuInflater inflater) {
        // Inflate the menu; this adds items to the action bar if it is present.

        Log.d("click" , "inside the on create");

        getActivity().getMenuInflater().inflate(R.menu.main, menu);
        SearchView searchView = (SearchView) menu.findItem(R.id.menu_search2).getActionView();
        searchView.setIconified(false);
        searchView.setOnQueryTextListener(this);
    }




    public boolean onQueryTextSubmit (String query) {

        //toast query

        //make json variables to fill

        // url to make request
        String url = "myURL";



        try {
            query = URLEncoder.encode(query, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        String jsonUrl = url + query;



        //todo: get json
        new ReadJSONResult(getActivity()).execute(jsonUrl);

        return false;
    }





    @Override
    public boolean onQueryTextChange(String newText) {
        // TODO Auto-generated method stub
        return false;
    }





}

的更新 的

我添加的代码是

    setHasOptionsMenu(true);

这是FC

02-13 17:11:11.093  21151-21151/com.beerportfolio.beerportfoliopro E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at com.beerportfolio.beerportfoliopro.Search.onCreateOptionsMenu(Search.java:66)
            at android.app.Fragment.performCreateOptionsMenu(Fragment.java:1868)
            at android.app.FragmentManagerImpl.dispatchCreateOptionsMenu(FragmentManager.java:2068)
            at android.app.Activity.onCreatePanelMenu(Activity.java:2567)
            at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:485)
            at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:851)
            at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:270)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:786)
            at android.view.Choreographer.doCallbacks(Choreographer.java:586)
            at android.view.Choreographer.doFrame(Choreographer.java:545)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:771)
            at android.os.Handler.handleCallback(Handler.java:730)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:158)
            at android.app.ActivityThread.main(ActivityThread.java:5789)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
            at dalvik.system.NativeStart.main(Native Method)

更新3：

根据下面的答案，我试图帮助我。我现在试过了：

super.onCreateOptionsMenu(android.R.menu, inflater);
        setHasOptionsMenu(true);

但是我收到了这个错误：

在android.R.menu上

Expression Expected

main.xml是：

<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/menu_search2"
        android:title="Search"
        android:onClick="goToSearch"
        android:icon="@android:drawable/ic_menu_search"
        android:showAsAction="ifRoom|collapseActionView"
        />


</menu>

Answer 1

您需要告诉您的片段想要参与选项菜单的活动。在onCreateView（）方法中添加：

setHasOptionsMenu(true);

http://developer.android.com/reference/android/app/Fragment.html#setHasOptionsMenu(boolean)

更新1 ：

你的onCreateOptionsMenu方法应该是：

    @Override
    public void onCreateOptionsMenu (Menu menu, MenuInflater inflater) {
        // Inflate the menu; this adds items to the action bar if it is present.

        super.onCreateOptionsMenu(menu, inflater);

        Log.d("click" , "inside the on create");

        inflater.inflate(R.menu.main, menu);
        SearchView searchView = (SearchView) menu.findItem(R.id.menu_search2).getActionView();
        searchView.setIconified(false);
        searchView.setOnQueryTextListener(this);
    }

更新2：

您的main.xml还需要声明操作视图类：

<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/menu_search2"
        android:actionViewClass="android.widget.SearchView"
        android:title="Search"
        android:onClick="goToSearch"
        android:icon="@android:drawable/ic_menu_search"
        android:showAsAction="ifRoom|collapseActionView"
        />
</menu>

不会从覆盖调用oncreate菜单选项

1 个答案: