問題解析JSON到列表視圖（片段）

我有問題得到解析的JSON字符串的工作，它返回一個空白的屏幕，並據我所知，沒有重大錯誤，以指示爲什麼.. I已附加我的logcat和代碼。問題解析JSON到列表視圖（片段）

logcat的

07-12 16:38:30.134 29441-29441/com.example.wtf    I/SurfaceTextureClient: [0x51830a20] frames:19, duration:3.969000, fps:4.786047 
07-12 16:38:30.135 29441-29441/com.example.wtf    V/Provider/Setting: from settings cache , name = sound_effects_enabled value = 0 
07-12 16:38:30.159 29441-29441/com.example.wtf    D/AbsListView: checkAbsListViewlLogProperty get invalid command 
07-12 16:38:30.469 29441-29441/com.example.wtf    D/dalvikvm: create interp thread : stack size=32KB 
07-12 16:38:30.470 29441-29441/com.example.wtf    D/dalvikvm: create new thread 
07-12 16:38:30.470 29441-29441/com.example.wtf    D/dalvikvm: update thread list 
07-12 16:38:30.472 29441-29920/com.example.wtf    D/dalvikvm: threadid=12: interp stack at 0x52b8c000 
07-12 16:38:30.472 29441-29920/com.example.wtf    D/dalvikvm: threadid=12: created from interp 
07-12 16:38:30.472 29441-29441/com.example.wtf    D/dalvikvm: start new thread 
07-12 16:38:30.472 29441-29441/com.example.wtf    I/Choreographer: Skipped 39 frames! The application may be doing too much work on its main thread. 
07-12 16:38:30.485 29441-29920/com.example.wtf    D/dalvikvm: threadid=12: notify debugger 
07-12 16:38:30.486 29441-29920/com.example.wtf    D/dalvikvm: threadid=12 (AsyncTask #2): calling run() 
07-12 16:38:30.488 29441-29920/com.example.wtf    I/System.out: httpget:http://gdata.youtube.com/feeds/api/videos?q=random&max-results=10&v=2&alt=jsonc&format=5 
07-12 16:38:30.506 29441-29441/com.example.wtf    W/MMUMapper: fail to register MVA, unsupported format(0x5) 
07-12 16:38:30.519 29441-29920/com.example.wtf    I/System.out: http://gdata.youtube.com/feeds/api/videos?q=random&max-results=10&v=2&alt=jsonc&format=5 
07-12 16:38:30.533 29441-29441/com.example.wtf    W/MMUMapper: fail to register MVA, unsupported format(0x5) 
07-12 16:38:30.561 29441-29441/com.example.wtf    W/MMUMapper: fail to register MVA, unsupported format(0x5) 
07-12 16:38:30.620 29441-29920/com.example.wtf    I/System.out: propertyValue:true 
07-12 16:38:30.621 29441-29920/com.example.wtf    I/System.out: [socket][1] connection /74.125.234.131:80;LocalPort=35635(0) 
07-12 16:38:30.624 29441-29920/com.example.wtf    I/System.out: [CDS]connect[/74.125.234.131:80] tm:90 
07-12 16:38:30.628 29441-29920/com.example.wtf    D/Posix: [Posix_connect Debug]Process com.example.wtf :80 
07-12 16:38:31.089 29441-29920/com.example.wtf    I/System.out: [socket][/192.168.1.34:35635] connected 
07-12 16:38:31.109 29441-29920/com.example.wtf    I/System.out: [CDS]rx timeout:0 
07-12 16:38:31.120 29441-29920/com.example.wtf    I/System.out: >doSendRequest 
07-12 16:38:31.161 29441-29920/com.example.wtf    I/System.out: <doSendRequest 
07-12 16:38:31.406 29441-29441/com.example.wtf    I/SurfaceTextureClient: [0x51830a20] frames:9, duration:1.268000, fps:7.095583 
07-12 16:38:31.526 29441-29441/com.example.wtf    I/SurfaceTextureClient: [0x52c09558] frames:75, duration:1.007000, fps:74.471581 
07-12 16:38:31.830 29441-29920/com.example.wtf    I/System.out: [CDS]close[35635] 
07-12 16:38:31.831 29441-29920/com.example.wtf    I/System.out: close [socket][/0.0.0.0:35635] 
07-12 16:38:31.832 29441-29920/com.example.wtf    I/System.out: close [socket][/0.0.0.0:35635] 
07-12 16:38:31.849 29441-29441/com.example.wtf    D/OpenGLRenderer: Flushing caches (mode 0) 
07-12 16:38:31.892 29441-29441/com.example.wtf    W/MMUMapper: invalid operation for unregister MVA with VA(0x5348c000) size(466560) f(0x5) 
07-12 16:38:31.893 29441-29441/com.example.wtf    W/MMUMapper: invalid operation for unregister MVA with VA(0x534fe000) size(466560) f(0x5) 
07-12 16:38:31.894 29441-29441/com.example.wtf    W/MMUMapper: invalid operation for unregister MVA with VA(0x53570000) size(466560) f(0x5) 
07-12 16:38:31.926 29441-29441/com.example.wtf    V/InputMethodManager: onWindowFocus: null softInputMode=32 first=false flags=#1810100

YoutubeAdapter.java

package com.example.wtf; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.TextView; 

import java.util.ArrayList; 

public class YoutubeAdapter extends BaseAdapter { 

Context mContext; 
LayoutInflater mInflater; 
ArrayList<String> mVideo= new ArrayList<String>(); 
ArrayList mTitle= new ArrayList<String>(); 

public YoutubeAdapter(Context context,ArrayList<String> a,ArrayList title) { 
    this.mContext=context; 
    mVideo=a; 
    //noinspection unchecked 
    mTitle = title; 
    mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

@Override 
public int getCount() { 
    return mVideo.size(); 
} 

@Override 
public Object getItem(int position) { 
    return position; 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(final int position, View arg1, ViewGroup arg2) { 
    ViewHolder vh; 

    if(arg1==null) 
    { 
     arg1=mInflater.inflate(R.layout.list_row, null); 
     vh= new ViewHolder(); 
     assert arg1 != null; 
     vh.tv=(TextView)arg1.findViewById(R.id.title); 
     arg1.setTag(vh); 
    } 
    else 
    { 
     vh= (ViewHolder)arg1.getTag(); 
    } 
    vh.tv.setText((String) mTitle.get(position)); 
    return arg1; 
} 

static class ViewHolder 
{ 
    TextView tv; 
} 
}

MyListFragment.java

package com.example.wtf; 

import android.app.ActionBar; 
import android.app.ActionBar.Tab; 
import android.app.Fragment; 
import android.app.FragmentTransaction; 
import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.Handler; 
import android.widget.ListView; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpVersion; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.params.CoreProtocolPNames; 
import org.apache.http.util.EntityUtils; 
import org.json.JSONArray; 
import org.json.JSONObject; 

import java.util.ArrayList; 

public class MyListFragment extends Fragment implements ActionBar.TabListener { 

private Fragment mFragment; 
ListView lv; 
ArrayList<String> msg = new ArrayList<String>(); 
ArrayList<String> title = new ArrayList<String>(); 
ProgressDialog pd; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getActivity().setContentView(R.layout.frag_mylist); 

    final Handler handler = new Handler(); 
    handler.postDelayed(new Runnable() { 
     @Override 
     public void run() { 
      new TheTask().execute(); 
     } 
    }, 50); 

    lv= (ListView) getActivity().findViewById(R.id.lv); 
    pd = new ProgressDialog(getActivity()); 
    pd.setTitle("Please Wait"); 
    pd.setMessage("Loading list.."); 
} 
public void getData() 
{ 
    HttpClient httpclient = new DefaultHttpClient(); 
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); 
    HttpGet request = new HttpGet("http://gdata.youtube.com/feeds/api/videos?q=random&max-results=10&v=2&alt=jsonc&format=5"); 
    try 
    { 
     HttpResponse response = httpclient.execute(request); 
     HttpEntity resEntity = response.getEntity(); 
     String _response= EntityUtils.toString(resEntity); // content will be consume only once 

     JSONObject json = new JSONObject(_response); 

     JSONArray jsonArray = json.getJSONObject("data").getJSONArray("items"); 
     for (int i = 0; i < jsonArray.length(); i++) { 
      JSONObject jsonObject = jsonArray.getJSONObject(i); 

      String title1 = jsonObject.getString("title"); 
      title.add(title1); 
     } 
    } 
    catch(Exception ListFragErr) 
    { 
     ListFragErr.printStackTrace(); 
    } 

    httpclient.getConnectionManager().shutdown(); 
} 
class TheTask extends AsyncTask<Void,Void,Void> 
{ 

    @Override 
    protected void onPostExecute(Void result) { 
     super.onPostExecute(result); 
     pd.dismiss(); 
     YoutubeAdapter you = new YoutubeAdapter(getActivity(),msg,title); 
     lv.setAdapter(you); 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pd.show(); 
    } 

    @Override 
    protected Void doInBackground(Void... params) { 
     getData(); 
     return null; 
    } 

} 
public void onTabSelected(Tab tab, FragmentTransaction ft) { 
    mFragment = new MyListFragment(); 
    ft.add(android.R.id.content, mFragment); 
    ft.attach(mFragment); 
} 

public void onTabUnselected(Tab tab, FragmentTransaction ft) { 
    ft.remove(mFragment); 
} 

public void onTabReselected(Tab tab, FragmentTransaction ft) { 

} 

}

frag_mylist.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:clickable="true"> 

<TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/Fragment2" 
     android:textColor="#f2f2f2" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:id="@+id/textView"/> 

<ListView 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:id="@+id/lv" 
     android:listSelector="@drawable/list_selector" 
     android:layout_alignParentBottom="true" 
     android:layout_below="@+id/textView"/> 

</RelativeLayout>

list_row.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="@drawable/list_selector" 
      android:orientation="horizontal" 
      android:padding="5dip" > 

<LinearLayout android:id="@+id/thumbnail" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:padding="3dip" 
       android:layout_alignParentLeft="true" 
       android:background="@drawable/image_bg" 
       android:layout_marginRight="5dip"> 

    <ImageView 
      android:id="@+id/list_image" 
      android:layout_width="50dip" 
      android:layout_height="50dip"/> 

</LinearLayout> 

<TextView 
     android:id="@+id/title" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignTop="@+id/thumbnail" 
     android:layout_toRightOf="@+id/thumbnail" 
     android:textColor="#040404" 
     android:typeface="sans" 
     android:textSize="15dip" 
     android:textStyle="bold"/> 

<TextView 
     android:id="@+id/artist" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@id/title" 
     android:textColor="#343434" 
     android:textSize="10dip" 
     android:layout_marginTop="1dip" 
     android:layout_toRightOf="@+id/thumbnail" 
     /> 

<TextView 
     android:id="@+id/duration" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentRight="true" 
     android:layout_alignTop="@id/title" 
     android:gravity="right" 
     android:layout_marginRight="5dip" 
     android:textSize="10dip" 
     android:textColor="#10bcc9" 
     android:textStyle="bold" 
     android:visibility="invisible"/> 

<ImageView android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:src="@drawable/arrow" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true"/> 

</RelativeLayout>

誰能告訴我什麼，我做錯了什麼？
PS：該作品JSON在另一個應用程序很好..
編輯：
我得到這些錯誤，以及警告，當我撫摸着列表視圖應的區域。

07-12 17:30:15.586 31273-31273/com.example.wtf W/AbsListView: Intent to operate on non-exist data, childcount = 0,mFirstPosition = 0,adapter count = 0,action = 2,mActivePointerId = 0,mScrollY = 0,this = [email protected] 
07-12 17:30:15.600 31273-31273/com.example.wtf W/AbsListView: Intent to operate on non-exist data, childcount = 0,mFirstPosition = 0,adapter count = 0,action = 2,mActivePointerId = 0,mScrollY = 0,this = [email protected] 
07-12 17:30:15.619 31273-31273/com.example.wtf W/AbsListView: Intent to operate on non-exist data, childcount = 0,mFirstPosition = 0,adapter count = 0,action = 2,mActivePointerId = 0,mScrollY = 0,this = [email protected] 
07-12 17:30:15.632 31273-31273/com.example.wtf W/AbsListView: Intent to operate on non-exist data, childcount = 0,mFirstPosition = 0,adapter count = 0,action = 2,mActivePointerId = 0,mScrollY = 0,this = [email protected] 
07-12 17:30:15.639 31273-31273/com.example.wtf W/AbsListView: Intent to operate on non-exist data, childcount = 0,mFirstPosition = 0,adapter count = 0,action = 2,mActivePointerId = 0,mScrollY = 0,this = [email protected] 
07-12 17:30:15.648 31273-31273/com.example.wtf W/AbsListView: Intent to operate on non-exist data, childcount = 0,mFirstPosition = 0,adapter count = 0,action = 1,mActivePointerId = 0,mScrollY = 0,this = [email protected]

來源

2013-07-12 Robert de Jonge

您是否嘗試過記錄或檢查是從服務器讀取字符串？它包含有效的JSON嗎？ – Christine

@Christine http://gdata.youtube.com/feeds/api/videos?q=random&max-results=1&v=2&alt=jsonc&format=5返回有效的JSON數據 –

@Christine也是我試圖從頭開始製作的API 。 –

onPostExecute（）代碼：

YoutubeAdapter you = new YoutubeAdapter(getActivity(),R.layout.list_row ,msg, title); 
     lv.setAdapter(you); 
ListView listView = (ListView)getActivity().findViewById(R.id.lv); 
listView.setAdapter(you);

的YoutubeAdapter：

public class YoutubeAdapter extends ArrayAdapter{ 

    Context context; 
    int layoutResourceId ; 

    private List<String> titleList ; 
    private List<String> msgList ; 

    private TextView title; 
    private TextView msg ; 


    public YoutubeAdapter(Context context, int layoutResourceId, List<String> titleList, List<String> msgList) { 
     super(context, layoutResourceId, titleList, msgList); 
     this.layoutResourceId = layoutResourceId; 
     this.context = context; 
     this.titleList = titleList ; 
     this.msgList= msgList; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     View currView = convertView; 
     currView = null ; 
     if(currView == null) { 

      LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
      currView = inflater.inflate(layoutResourceId, parent, false); 


      title = (TextView)currView.findViewById(R.id.title); 
      msg = (TextView)currView.findViewById(R.id.artist);    

      currView.setTag(title) ; 
      currView.setTag(msg) ;  

     } 

     String title = titleList.get(position); 
     String msg = msgList.get(position); 

     title.setText(title); 
     msg.setText(msg); 

     //currView.setId(id) ; 

     return currView ; 
    } 

}

來源

2013-07-12 22:47:23

還是一樣..沒有出現，我拉我的頭髮在這..因爲它在我的其他「活動」的應用程序工作正常 –

好吧別擔心，在列表中放置一個斷點並檢查它們的大小。它們是否爲空？請確認 –

它沒有達到我放入的斷點，我在MyListFragment和YoutubeAdapter中放置了幾個不在虛擬或物理設備上的文件 –

問題解析JSON到列表視圖（片段）

回答

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