我遇到了解析JSON字符串工作的问题，它返回一个空白屏幕，并且据我所知，没有重大错误来指示原因。 我附上了我的logcat和代码。
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>
谁能告诉我我做错了什么？
Ps：JSON在另一个应用程序中工作正常。
修改
当我触摸列表视图所在的区域时，我会收到这些错误，并发出警告。
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 = android.widget.ListView@419fd3d8
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 = android.widget.ListView@419fd3d8
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 = android.widget.ListView@419fd3d8
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 = android.widget.ListView@419fd3d8
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 = android.widget.ListView@419fd3d8
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 = android.widget.ListView@419fd3d8
答案 0 :(得分：0)
onPostExecute（）代码：
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);
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 ;
}
}