【发布时间】：2014-07-10 05:43:34
【问题描述】：
我在扩展到
BaseFragment.如果我将我的VideoDetailFragment.java扩展到Activity我没有得到任何 错误。但我需要将其扩展为
BaseFragment。因为我需要获取ListView当点击那个我可以得到视频显示在那个 网址。
我的issue 是我收到以下错误：
- 构造函数 ArrayAdapter(VideoDetailFragment, int, String[]) 未定义
- VideoDetailFragment 类型的方法 finish() 未定义
- 构造函数 Intent(VideoDetailFragment, 类）未定义
- 构造函数 ProgressDialog(VideoDetailFragment) 未定义
下面我在行尾提到了这些所有错误。
VideoDetailFragment.java：
package com.sit.fth.frgment;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.app.ProgressDialog;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.fth.android.R;
import com.sit.fth.app.BaseFragment;
import com.sit.fth.model.JSONParser;
import com.sit.fth.activity.YoutubePlayActivity;
import java.util.ArrayList;
import java.util.List;
public class VideoDetailFragment extends BaseFragment {
// Categories must be pre-set
private String[] data = {"Category1", "Category2", "Category3"};
private final String TAG_VIDEOS = "videos";
private final String TAG_CAT = "video_category";
private final String TAG_URL = "video_url";
private final String TAG_TITLE = "video_title";
private List<String> videoTitles = new ArrayList<String>();
private List<String> videoURLs = new ArrayList<String>();
private ArrayAdapter<String> adapter;
private Object extras;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.list1, null);
ListView listView = ((ListView)view.findViewById(R.id.listview));
AdapterView.OnItemClickListener clickListener = null;
// Category view:
if (extras == null) {
clickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(VideoDetailFragment.this,VideoDetailFragment.class); ----->3rd Error
intent.putExtra("categoryName", data[position]);
startActivity(intent);
}
};
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, data); --->1st Error at this line
}
else { // Child view
// Get the category of this child
String categoryName = ((Bundle) extras).getString("categoryName");
if (categoryName == null)
finish(); ------>2nd Error
// Populate list with videos of "categoryName", by looping JSON data
new JSONParse(categoryName).execute();
clickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(VideoDetailFragment.this, YoutubePlayActivity.class); ----->Third Error
// Send video url and title to YoutubeActivity
intent.putExtra("videoUrl", videoURLs.get(position));
intent.putExtra("videoTitle", videoTitles.get(position));
startActivity(intent);
}
};
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, videoTitles); ---->First Error
}
listView.setAdapter(adapter);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(clickListener);
return listView;
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
private String categoryName;
// Constructor // Get the categoryName of which videos will be found
public JSONParse(String category) {
this.categoryName = category;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a loading dialog when getting the videos
pDialog = new ProgressDialog(VideoDetailFragment.this); ---->4th Error
pDialog.setMessage("Getting Videos...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Get JSON from URL
JSONObject json = jParser.getJSONFromUrl(JSONUrl);
if (json == null)
return null;
try {
// Get video array
JSONArray videos = json.getJSONArray(TAG_VIDEOS);
// Loop all videos
for (int i=0; i<videos.length(); i++) {
JSONObject video = videos.getJSONObject(i);
Log.e("JSON:", "cat: "+video.getString(TAG_CAT)+",title: "+video.getString(TAG_TITLE)+", url: "+video.getString(TAG_URL));
// Check if video belongs to "categoryName"
if (video.getString(TAG_CAT).equals(categoryName)) {
addVideo(video);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return json;
}
private void addVideo(JSONObject video) {
try {
// Add title and URL to their respective arrays
videoTitles.add(video.getString(TAG_TITLE));
videoURLs.add(video.getString(TAG_URL));
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
protected void onPostExecute(JSONObject json) {
// Close the "loading" dialog
pDialog.dismiss();
if (json == null) {
// Do something when there's no internet connection
// Or there are no videos to be displayed
}
else // Let the adapter notify ListView that it has new items
adapter.notifyDataSetChanged();
}
}
}
我不知道如何解决这些问题。任何人都可以帮助我解决这些问题。谢谢。
【问题讨论】：
标签： android android-fragments fragment android-fragmentactivity