解析的Youtube的GData JSON成的ListView [英] Parsing Youtube Gdata json into ListView
本文介绍了解析的Youtube的GData JSON成的ListView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直在试图找到Android的解析的Youtube GData的JSON来填充列表视图的工作的例子。
I have been trying to find a working example of "Parsing Youtube Gdata JSON" in Android to populate a listview.
我一直在阅读这个问题，和我差不多有工作，除了4个错误..
I have been reading this question, and I almost have it working except for 4 errors..
- ITEM_TITLE
- item_subtitle
- setListAdapter
-
getListView
- item_title
- item_subtitle
- setListAdapter
getListView
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class listview extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_main);
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
//Get the data (see above)
JSONObject json = getJSON.getJSONfromURL("https://gdata.youtube.com/feeds/api/videos?q=random&max-results=50&v=2&alt=jsonc");
try{
final JSONArray array = json.getJSONArray("items");
//Loop the Array
for(int i=0;i < array.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = array.getJSONObject(i);
map.put("id", String.valueOf(i));
map.put("title", "" + e.getString("title"));
map.put("viewCount", "Views: " + e.getString("viewCount"));
mylist.add(map);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.dubstep,
new String[] { "title", "viewCount" },
new int[] { R.id.item_title, R.id.item_subtitle });
setListAdapter(adapter);
final ListView lv = getListView();
//final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Toast.makeText(listview.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.listview, menu);
return true;
}
}
报告说，无法解析符号'ITEM_TITLE'和'item_subtitle
和
无法解析法setListAdapter（android.widget.ListAdapter）
It says "Cannot resolve symbol 'item_title' and 'item_subtitle'
and
"Cannot resolve method 'setListAdapter(android.widget.ListAdapter)'
任何帮助是AP preciated，谢谢！
Any help is appreciated, Thanks!
推荐答案
您的活动类不会扩展 ListActivity 。因此，错误3和4
Your activity class does not extend ListActivity. Hence the errors 3 and 4
您应该使用的AsyncTask 网络相关的操作。你不能在主UI线程上运行的网络相关的操作。
You should use AsyncTask for network related operation. You cannot run network related operation on the main ui thread.
您应该使用延迟加载图像。但是，对于样本，我有使用位图的ArrayList中的缩略图。你可能会遇到内存泄漏。因此，使用延迟加载。根据您的要求修改如下：
You should use lazy loading for images. But for sample i have use a ArrayList of bitmaps for thumbnail. You might run into memory leaks. So use lazy loading. Modify the below according to your requirement.
例如：
public class MainActivity extends Activity {
Button b;
ListView lv;
ArrayList<String> msg = new ArrayList<String>();
ArrayList<String> title = new ArrayList<String>();
ArrayList<Bitmap> thumb = new ArrayList<Bitmap>();
ProgressDialog pd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv= (ListView) findViewById(R.id.lv);
pd = new ProgressDialog(MainActivity.this);
pd.setTitle("Loading..");
b= (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new TheTask().execute();
}
});
}
@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, menu);
return true;
}
public void getData()
{
HttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpGet request = new HttpGet("https://gdata.youtube.com/feeds/api/videos?q=random&max-results=50&v=2&alt=jsonc");
// HttpGet request = new HttpGet("http://gdata.youtube.com/feeds/api/users/mbbangalore/uploads?v=2&alt=jsonc");
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);
String thumbUrl = jsonObject.getJSONObject("thumbnail").getString("sqDefault");
URL url1 = new URL(thumbUrl);
Bitmap bmp = BitmapFactory.decodeStream(url1.openConnection().getInputStream());
thumb.add(bmp);
String url;
try {
url = jsonObject.getJSONObject("player").getString("default");
msg.add(url);
} catch (JSONException ignore) {
}
}
}
catch(Exception e1)
{
e1.printStackTrace();
}
httpclient.getConnectionManager().shutdown();
}
class TheTask extends AsyncTask<Void,Void,Void>
{
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pd.dismiss();
YouTubeAdapter you = new YouTubeAdapter(MainActivity.this,msg,title,thumb);
lv.setAdapter(you);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pd.show();
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
getData();
return null;
}
}
}
activity_main.xml
activity_main.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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/lv"
android:layout_above="@+id/button1"
/>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
</RelativeLayout>
YouTubeAdapter
YouTubeAdapter
public class YouTubeAdapter extends BaseAdapter{
Context mContext;
Intent intent;
LayoutInflater mInflater;
ArrayList<String> mVideo= new ArrayList<String>();
ArrayList<String> mTitle= new ArrayList<String>();
ArrayList<Bitmap> mThumb= new ArrayList<Bitmap>();
public YouTubeAdapter(Context context,ArrayList<String> a,ArrayList title,ArrayList thumb) {
mContext=context;
mVideo=a;
mTitle = title;
mThumb= thumb;
mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mVideo.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View arg1, ViewGroup arg2) {
ViewHolder vh;
if(arg1==null)
{
arg1=mInflater.inflate(R.layout.video, null);
vh= new ViewHolder();
vh.tv=(TextView)arg1.findViewById(R.id.tvv);
vh.iv=(ImageView)arg1.findViewById(R.id.ivv);
arg1.setTag(vh);
}
else
{
vh= (ViewHolder)arg1.getTag();
}
vh.tv.setText(mTitle.get(position));
vh.iv.setImageBitmap(mThumb.get(position));
return arg1;
}
static class ViewHolder
{
TextView tv;
ImageView iv;
}
}
video.xml
video.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/tvv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textColor="#000000"
android:textSize="13dp" />
<ImageView
android:id="@+id/ivv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
快照
这篇关于解析的Youtube的GData JSON成的ListView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！
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