语音实现后的 SearchView 抛出 NullPointerException [英] SearchView After Voice Implemantation throws NullPointerException

问题描述

我尝试按照此处的步骤实现语音搜索；SearchView 中的 ActionBar 麦克风按钮(语音搜索)

I tried to implement Voice Search by following steps here; ActionBar Mic Button(Voice Search) in SearchView

一切都很好，我已经将所有必要的信息添加到了我的 AndroidManifest 和 searcabhle.xml 中，所以我能够看到麦克风图标和搜索栏，问题是当我在说一些东西后尝试用语音搜索时，它没有找不到任何东西，应用程序崩溃，SetQuery 似乎有问题，这里是完整的错误；

Everything is fine,I've added all necessary info to my AndroidManifest and searcabhle.xml so I'm able to see mic icon and Search Bar,the problem is when I try to search with voice after saying something,it doesn't find anything and app crashes,looks like something wrong with SetQuery and here's the full error;

2019-03-13 04:55:55.723 1533-1533/com.demotxt.myapp.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.demotxt.myapp.myapplication, PID: 1533
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setQuery(java.lang.CharSequence, boolean)' on a null object reference
    at com.demotxt.myapp.myapplication.activities.MainActivity.onNewIntent(MainActivity.java:153)
    at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1231)
    at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1243)
    at android.app.ActivityThread.deliverNewIntents(ActivityThread.java:3064)
    at android.app.ActivityThread.performNewIntents(ActivityThread.java:3076)
    at android.app.ActivityThread.handleNewIntent(ActivityThread.java:3085)
    at android.app.ActivityThread.-wrap17(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1710)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6682)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

这是我的 Main3Activity;

And this is my Main3Activity;

 private static final String TAG = "Main3Activity";
private final String JSON_URL = "https://MYURLXXX" ;
private JsonArrayRequest request ;
private RequestQueue requestQueue ;
private List<Anime> lstAnime ;
private RecyclerView recyclerView ;
private RecyclerViewLiveAdapter adapter;
RecyclerView.LayoutManager layoutManager;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        lstAnime = new ArrayList<>() ;
        recyclerView = findViewById(R.id.recyclerviewid);
        jsonrequest();



    }

    private void jsonrequest() {

        request = new JsonArrayRequest(JSON_URL, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {

                JSONObject jsonObject  = null ;

                for (int i = 0 ; i < response.length(); i++ ) {


                    try {
                        jsonObject = response.getJSONObject(i) ;
                        Anime anime = new Anime() ;
                        anime.setName(jsonObject.getString("name"));
                        anime.setDescription(jsonObject.getString("description"));
                        anime.setRating(jsonObject.getString("Rating"));
                        anime.setCategorie(jsonObject.getString("categorie"));
                        anime.setStudio(jsonObject.getString("studio"));
                        anime.setImage_url(jsonObject.getString("img"));
                        anime.setLink(jsonObject.getString("link"));
                        anime.setDrm_scheme(jsonObject.getString("drm_scheme"));
                        anime.setDrm_license_url(jsonObject.getString("drm_license_url"));
                        anime.setDrm(jsonObject.getString("drm"));
                        anime.setSubtitle(jsonObject.getString("subtitle"));
                        anime.setSubtitle1(jsonObject.getString("subtitle1"));
                        anime.setSubtitle2(jsonObject.getString("subtitle2"));
                        lstAnime.add(anime);

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                    setuprecyclerview(lstAnime);


                }


            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });


        requestQueue = Volley.newRequestQueue(Main3Activity.this);
        requestQueue.add(request) ;


    }

    private void setuprecyclerview(List<Anime> lstAnime) {


        adapter = new RecyclerViewLiveAdapter(this,lstAnime) ;
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(adapter);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_item,menu);

        MenuItem searchItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) searchItem.getActionView();
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener()
        {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                if (adapter != null){
                adapter.getFilter().filter(newText);}
                return false;
            }
        });
        return true;

    }

   protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
            String query = intent.getStringExtra(SearchManager.QUERY);

            searchView.setQuery(query, false);
        }
    }
}

我在我的适配器中过滤东西，但由于这里发生错误，我认为没有必要将我的适配器代码放在这里，而且因为文本过滤效果很好，唯一的问题是语音搜索.

I do filtering stuff in my adapter but since error happens here, I think there's no need to put my adapter code here and also because filtering with text works perfectly, the only problem is voice search.

推荐答案

那是因为您正在访问 onNewIntent() 中的空 searchView 对象.在您的类中为 searchView 创建一个全局引用变量，并在 onCreateOptionsMenu() 中实例化.如下图:

That's because you are accessing a null searchView object in onNewIntent(). Create a global reference variable for searchView in your class and instantiate in onCreateOptionsMenu(). Like below:

SearchView searchView;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_item,menu);

        MenuItem searchItem = menu.findItem(R.id.action_search);
        searchView = (SearchView) searchItem.getActionView();
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener()
        {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                if (adapter != null){
                adapter.getFilter().filter(newText);}
                return false;
            }
        });
        return true;
}

这篇关于语音实现后的 SearchView 抛出 NullPointerException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！