Question

我知道这个问题已被多次询问过，但似乎没有一个解决方案适合我。请帮忙。

的manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="abhimanyu.example.com.seed" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/Theme.MyCompatTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data
                android:name="android.app.default_searchable"
                android:value=".SearchResultsActivity" />
        </activity>

        <activity
            android:name=".SearchResultsActivity"
            android:label="@string/app_name"
            android:theme="@style/Theme.MyCompatTheme">

            <!-- to identify this activity as "searchable" -->
            <intent-filter>
                <action android:name="android.intent.action.SEARCH" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>

            <meta-data
                android:name="android.app.searchable"
                android:resource="@xml/searchable" />
        </activity>
    </application>
</manifest>

MainActivity.java

package abhimanyu.example.com.seed;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

import abhimanyu.example.com.seed.adater.CustomListAdapter;
import abhimanyu.example.com.seed.app.AppController;
import abhimanyu.example.com.seed.model.Movie;

public class MainActivity extends Activity {

    private static final String TAG = MainActivity.class.getSimpleName();

// Movies json url
private static final String     url="http://api.androidhive.info/json/movies.json";  
private ProgressDialog pDialog;
private List<abhimanyu.example.com.seed.model.Movie> movieList = new          ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;

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

    listView = (ListView) findViewById(R.id.list);
    adapter = new CustomListAdapter(this,movieList);
    listView.setAdapter(adapter);

    pDialog = new ProgressDialog(this);
    // Showing progress dialog before making http request
    pDialog.setMessage("Loading...");
    pDialog.show();

    // changing action bar color
    getActionBar().setBackgroundDrawable(
            new ColorDrawable(Color.parseColor("#00897B")));
    getActionBar().setHomeButtonEnabled(true);

    getActionBar().setTitle("Abhimanyu");
    getActionBar().setIcon(R.drawable.pp);


    // Creating volley request obj
    JsonArrayRequest movieReq = new JsonArrayRequest(url,
            new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    Log.d(TAG, response.toString());
                  //  hidePDialog();

                    // Parsing json
                    for (int i = 0; i < response.length(); i++) {
                        try {

                            JSONObject obj = response.getJSONObject(i);
                            Movie movie = new Movie();
                            movie.setTitle(obj.getString("title"));
                            movie.setThumbnailUrl(obj.getString("image"));
                            movie.setRating(((Number) obj.get("rating"))
                                    .doubleValue());
                            movie.setYear(obj.getInt("releaseYear"));

                            // Genre is json array
                            JSONArray genreArry = obj.getJSONArray("genre");
                            ArrayList<String> genre = new ArrayList<String>();
                            for (int j = 0; j < genreArry.length(); j++) {
                                genre.add((String) genreArry.get(j));
                            }
                            movie.setGenre(genre);

                            // adding movie to movies array
                            movieList.add(movie);

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

                    }

                    // notifying list adapter about data changes
                    // so that it renders the list view with updated data
                    adapter.notifyDataSetChanged();
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            VolleyLog.d(TAG, "Error: " + error.getMessage());
      //      hidePDialog();

        }
    });

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(movieReq);
}

@Override
public void onDestroy() {
    super.onDestroy();
    //hidePDialog();
}
/*
    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }



/* public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        // Inflate menu to add items to action bar if it is present.
        inflater.inflate(R.menu.menu_main, menu);
        // Associate searchable configuration with the SearchView
        SearchManager searchManager =
                (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        SearchView searchView =
                (SearchView) menu.findItem(R.id.search_action).getActionView();
        searchView.setSearchableInfo(
                searchManager.getSearchableInfo(getComponentName()));
        return true;
    }*/
}

SearchResultActivity.java

package abhimanyu.example.com.seed;

import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.SearchView;
import android.view.Menu;
import android.view.MenuInflater;

public class SearchResultsActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_result);
    handleIntent(getIntent());
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_main, menu);
    SearchManager searchManager =
            (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    SearchView searchView =
            (SearchView) menu.findItem(R.id.search_action).getActionView();
    searchView.setSearchableInfo(
            searchManager.getSearchableInfo(getComponentName()));

    return true;
}

@Override
protected void onNewIntent(Intent intent) {
    handleIntent(intent);
}

private void handleIntent(Intent intent) {

    if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
        String query = intent.getStringExtra(SearchManager.QUERY);
        //use the query to search
    }
}
}

我是Android开发的新手，请帮我解决这个异常。这是Logcat

12-18 15：57：19.319 6757-6757 / info.androidhive.customlistviewvolley E / AndroidRuntime：致命异常：主要处理：info.androidhive.customlistviewvolley，PID：6757 显示java.lang.NullPointerException 在 info.androidhive.customlistviewvolley.MainActivity.onCreateOptionsMenu（MainActivity.java:142）在android.app.Activity.onCreatePanelMenu（Activity.java:2538）在 com.android.internal.policy.impl.PhoneWindow.preparePanel（PhoneWindow.java:436）在 com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu（PhoneWindow.java:800）在 com.android.internal.policy.impl.PhoneWindow $ 1.run（PhoneWindow.java:221）在 android.view.Choreographer $ CallbackRecord.run（Choreographer.java:761）在android.view.Choreographer.doCallbacks（Choreographer.java:574）在android.view.Choreographer.doFrame（Choreographer.java:543）在 android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:747）在android.os.Handler.handleCallback（Handler.java:733）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:136）在android.app.ActivityThread.main（ActivityThread.java:5001） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:515）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:785）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601）在dalvik.system.NativeStart.main（本地方法）

Answer 1

您的活动中包含第142行的内容尚不清楚，但我猜您的searchView为空。使用searchView的Nullpointer异常听起来对我来说非常熟悉，因为我之前在片段的onCreateOptionsMenu中挣扎了它

  public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.main_menu, menu);

SearchManager searchManager =
        (SearchManager)getActivity().getSystemService(Context.SEARCH_SERVICE);
SearchableInfo searchableInfo =
        searchManager.getSearchableInfo(getActivity().getComponentName());
searchItem = menu.findItem(R.id.menu_search);
SearchView searchView = (SearchView) searchItem.getActionView();
searchView.setSearchableInfo( searchableInfo);

.....

}

在我的menu_search中将actionViewClass的命名空间从android更改为app
为我工作。

<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="...">
  <item
android:id="@+id/menu_search"
android:title="@string/menu_search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="ifRoom">

java.lang.RuntimeException：无法在searchview

1 个答案: