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Java 框架/页面适配器中的ListView为空_Java_Android_Listview - Fatal编程技术网

Java 框架/页面适配器中的ListView为空

Java 框架/页面适配器中的ListView为空,java,android,listview,Java,Android,Listview,我正在创建一个基本的android应用程序,并使用创建的默认值创建第一个活动。此活动具有页面适配器。我希望在每个页面中都有不同的布局,并且希望在第一个页面中有一个ListView,因此我做了以下操作: public static class DummySectionFragment extends Fragment { /** * The fragment argument representing the section number for this

我正在创建一个基本的android应用程序,并使用创建的默认值创建第一个活动。此活动具有页面适配器。我希望在每个页面中都有不同的布局,并且希望在第一个页面中有一个
ListView
,因此我做了以下操作:

public static class DummySectionFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        public static final String ARG_SECTION_NUMBER = "section_number";

        public DummySectionFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            int page = getArguments().getInt(ARG_SECTION_NUMBER); 
            switch(page){
            case 1:
                SettingListAdapter settingAdapter = new SettingListAdapter(getActivity().getApplicationContext(), R.layout.setting_item_row, MainFeedActivity.mProfileList);
                ListView listView = (ListView)this.getActivity().findViewById(R.id.listView1);
                listView.setAdapter(settingAdapter); 
                break;
            case 2:
                break;
            case 3:
                break; 
            }
            View rootView = inflater.inflate(R.layout.fragment_main_feed_dummy,
                    container, false);
            TextView dummyTextView = (TextView) rootView
                    .findViewById(R.id.section_label);
            dummyTextView.setText(Integer.toString(getArguments().getInt(
                    ARG_SECTION_NUMBER)));
            return rootView;
        }
    }
但是我的
ListView
返回了
null
,我不知道为什么。有谁能帮我弄清楚我的代码哪里做错了吗

如果您需要,以下是整个课程:

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;

import com.facebook.RequestBatch;
import com.redclay.fanaddict.R;
import com.redclay.fanaddict.helpers.Parser;
import com.redclay.fanaddict.helpers.SettingListAdapter;
import com.redclay.fanaddict.models.DeviceSettings;
import com.redclay.fanaddict.models.UserProfile;

public class MainFeedActivity extends FragmentActivity {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
     * will keep every loaded fragment in memory. If this becomes too memory
     * intensive, it may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;
    private String jsonResponse = null; 
    private static DeviceSettings mDeviceSettings;
    private static List<UserProfile> mProfileList = new ArrayList<UserProfile>(); 
    public static List<Long> mProfileIdList = new ArrayList<Long>(); 
    private final String URL = "http://fanaddictsweb.redcley.com/Services/UserProfileService.svc/2/login";

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

        RequestUserFeed feed = new RequestUserFeed(); 
        feed.execute(URL); 

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the app.
        mSectionsPagerAdapter = new SectionsPagerAdapter(
                getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);






    }

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

    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            // getItem is called to instantiate the fragment for the given page.
            // Return a DummySectionFragment (defined as a static inner class
            // below) with the page number as its lone argument.
            Fragment fragment = new DummySectionFragment();
            Bundle args = new Bundle();
            args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
            fragment.setArguments(args);
            return fragment;
        }

        @Override
        public int getCount() {
            // Show 3 total pages.
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            Locale l = Locale.getDefault();
            switch (position) {
            case 0:
                return getString(R.string.title_main_feed).toUpperCase(l);
            case 1:
                return getString(R.string.title_settings).toUpperCase(l);
            case 2:
                return getString(R.string.title_about).toUpperCase(l);
            }
            return null;
        }
    }

    /**
     * A dummy fragment representing a section of the app, but that simply
     * displays dummy text.
     */
    public static class DummySectionFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        public static final String ARG_SECTION_NUMBER = "section_number";

        public DummySectionFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            int page = getArguments().getInt(ARG_SECTION_NUMBER); 
            switch(page){
            case 1:
                SettingListAdapter settingAdapter = new SettingListAdapter(getActivity().getApplicationContext(), R.layout.setting_item_row, MainFeedActivity.mProfileList);
                ListView listView = (ListView)this.getActivity().findViewById(R.id.listView1);
                listView.setAdapter(settingAdapter); 
                break;
            case 2:
                break;
            case 3:
                break; 
            }
            View rootView = inflater.inflate(R.layout.fragment_main_feed_dummy,
                    container, false);
            TextView dummyTextView = (TextView) rootView
                    .findViewById(R.id.section_label);
            dummyTextView.setText(Integer.toString(getArguments().getInt(
                    ARG_SECTION_NUMBER)));
            return rootView;
        }
    }


    class RequestUserFeed extends AsyncTask<String, String, HttpResponse>{
        HttpResponse response = null; 

        @Override
        protected HttpResponse doInBackground(String... uri) {
            HttpClient httpClient = new DefaultHttpClient(); 
            HttpPost post = new HttpPost(uri[0]); 
            post.addHeader("Content-Type", "application/json"); 
            try {
                JSONObject json = new JSONObject(); 
                json.put("UserName", "michigan");
                json.put("Password", "fanaddicts");
                json.put("DeviceHardwareId", "NW58xfxz/w+jCiI3E592degUCL4=");
                json.put("DeviceTypeId", "1");
                StringEntity se = new StringEntity(json.toString()); 
                Log.i("Feed Request", "SE: " + json.toString()); 
                post.setEntity(se);

                response = httpClient.execute(post); 

                Log.i("Feed Response", "Feed: " + response.getStatusLine().getStatusCode()); 

            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 

            return response;
        }

        @Override
        protected void onPostExecute(HttpResponse result) {
            HttpEntity entity = result.getEntity(); 

            try {
                jsonResponse = EntityUtils.toString(entity); 
                System.out.println("Resposne: " + jsonResponse );
                Parser parser = new Parser(jsonResponse); 
                MainFeedActivity.mDeviceSettings = parser.getmDeviceSettings(); 
                MainFeedActivity.mProfileList = parser.getmProfileList(); 
                MainFeedActivity.mProfileIdList = parser.getUserProfileIds(MainFeedActivity.mProfileList);
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
        }


    }

    class RequestSocialMediaFeeds extends AsyncTask<List<Long>, String, String>{

        @Override
        protected String doInBackground(List<Long>... arg0) {
            List<Long> mList = arg0[0]; 
            RequestBatch batch = new RequestBatch(); 

            return null;
        }

    }
}
import java.io.IOException;
导入java.util.ArrayList;
导入java.util.List;
导入java.util.Locale;
导入org.apache.http.HttpEntity;
导入org.apache.http.HttpResponse;
导入org.apache.http.ParseException;
导入org.apache.http.client.ClientProtocolException;
导入org.apache.http.client.HttpClient;
导入org.apache.http.client.methods.HttpPost;
导入org.apache.http.entity.StringEntity;
导入org.apache.http.impl.client.DefaultHttpClient;
导入org.apache.http.util.EntityUtils;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.support.v4.app.Fragment;
导入android.support.v4.app.FragmentActivity;
导入android.support.v4.app.FragmentManager;
导入android.support.v4.app.FragmentPagerAdapter;
导入android.support.v4.view.ViewPager;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.Menu;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ListView;
导入android.widget.TextView;
导入com.facebook.RequestBatch;
进口com.redclay.fandactive.R;
导入com.redclay.fanaddice.helpers.Parser;
导入com.redclay.fanactinc.helpers.SettingListAdapter;
导入com.redclay.fanaddict.models.DeviceSettings;
导入com.redclay.fanaddice.models.UserProfile;
公共类MainFeedActivity扩展了FragmentActivity{
/**
*将提供的{@link android.support.v4.view.PagerAdapter}
*每个部分的片段。我们使用
*{@link android.support.v4.app.FragmentPagerAdapter}派生,其中
*将所有加载的片段保留在内存中。如果这变得太内存化
*密集型,最好换成
*{@link android.support.v4.app.FragmentStatePagerAdapter}。
*/
分段SPAGERADAPTER mSectionsPagerAdapter;
/**
*将承载节内容的{@link ViewPager}。
*/
ViewPager mViewPager;
私有字符串jsonResponse=null;
专用静态设备设置mDeviceSettings;
私有静态列表mProfileList=newarraylist();
public static List mProfileIdList=new ArrayList();
私有最终字符串URL=”http://fanaddictsweb.redcley.com/Services/UserProfileService.svc/2/login";
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u main\u feed);
RequestUserFeed=新的RequestUserFeed();
feed.execute(URL);
//创建适配器,该适配器将为这三个函数中的每一个返回一个片段
//应用程序的主要部分。
mSectionsPagerAdapter=新节spageradapter(
getSupportFragmentManager());
//使用分区适配器设置ViewPager。
mViewPager=(ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main_feed,menu);
返回true;
}
/**
*一个{@link FragmentPagerAdapter},返回对应于
*其中一个部分/选项卡/页面。
*/
公共类节SpagerAdapter扩展了FragmentPagerAdapter{
公共部分SpagerAdapter(碎片管理器fm){
超级(fm);
}
@凌驾
公共片段getItem(int位置){
//调用getItem来实例化给定页面的片段。
//返回DummySectionFragment(定义为静态内部类
//下面)将页码作为其唯一参数。
Fragment Fragment=新的DummySectionFragment();
Bundle args=新Bundle();
args.putInt(DummySectionFragment.ARG_节号,位置+1);
fragment.setArguments(args);
返回片段;
}
@凌驾
public int getCount(){
//显示共3页。
返回3;
}
@凌驾
公共字符序列getPageTitle(int位置){
Locale l=Locale.getDefault();
开关(位置){
案例0:
返回getString(R.string.title\u main\u feed).toUpperCase(l);
案例1:
返回getString(R.string.title\u设置).toUpperCase(l);
案例2:
返回getString(R.string.title_about).toUpperCase(l);
}
返回null;
}
}
/**
*一个虚拟片段,表示应用程序的一部分,但是
*显示虚拟文本。
*/
公共静态类DummySectionFragment扩展了片段{
/**
*表示此文件节号的片段参数
*碎片。
*/
公共静态最终字符串ARG\u SECTION\u NUMBER=“SECTION\u NUMBER”;
公共数据段(){
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
int page=getArguments().getInt(参数节号);
交换机(第页){
案例1:
SettingListAdapter settingAdapter=新的SettingListAdapter(getActivity().getApplicationContext(),R.layout.setting_item_行,MainFeedActivity.mProfileList);
ListView ListView=(ListView)this.g
   View rootView = inflater.inflate(R.layout.fragment_main_feed_dummy,
                    container, false);
ListView listView = (ListView)this.getActivity().findViewById(R.id.listView1);