我正在开发一个应用程序。在活动中，活动列出来自服务器的内容并将其显示在列表视图中。我正在扩展 SherlockActivity。但是上下文菜单没有出现。代码是这样的
新闻活动.java
package com.ministry.ensing119app.news;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.ministry.ensing119app.Contact;
import com.ministry.ensing119app.HomeScreen;
import com.ministry.ensing119app.R;
import com.ministry.ensing119app.bible.BibleActivity;
import com.ministry.ensing119app.donate.Donate;
import com.ministry.ensing119app.photos.GetPath;
import com.ministry.ensing119app.sermonnotes.Notes_list;
public class NewsActivity extends SherlockActivity {
public static String url = "http://ensignweb.com/sandbox/app/comment11.php";
// JSON Node names
protected static final String TAG_PRODUCTS = "products";
protected static final String TAG_CID = "cid";
public static final String TAG_NAME = "name";
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
// contacts JSONArray
JSONArray products = null;
ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
actionBar = getSupportActionBar();
setContentView(R.layout.activity_news);
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {
Log.d("if condition", "if condition is running");
new Message().execute(url);
// The service section
Intent intent = new Intent(this,UpdateService.class);
PendingIntent pIntent = PendingIntent.getService(this, 0, intent, 0);
AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 30000, pIntent);
startService(new Intent(this, UpdateService.class));
} else {
Log.d("if condition", "else condition is running");
Toast.makeText(getApplicationContext(), "There is no internet or low. Please check", Toast.LENGTH_LONG).show();
Intent returnIntent = new Intent(NewsActivity.this, HomeScreen.class);
startActivity(returnIntent);
}
}
public boolean onCreateOptionsMenu(com.actionbarsherlock.view.Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getSupportMenuInflater();
inflater.inflate(R.menu.news, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
case R.id.donate:
Intent newsIntent = new Intent(NewsActivity.this, Donate.class);
startActivity(newsIntent);
break;
case R.id.photos:
Intent photoIntent = new Intent(NewsActivity.this, GetPath.class);
startActivity(photoIntent);
break;
case R.id.notepad:
Intent notePadIntent = new Intent(NewsActivity.this, Notes_list.class);
startActivity(notePadIntent);
break;
case R.id.contact:
Intent contactIntent = new Intent(NewsActivity.this,Contact.class);
startActivity(contactIntent);
break;
case R.id.bible:
Intent BibleIntent = new Intent(NewsActivity.this, BibleActivity.class);
startActivity(BibleIntent);
break;
}
return super.onMenuItemSelected(featureId, item);
}
class Message extends AsyncTask<String, Integer, ArrayList<HashMap<String, String>> > {
ListView lv = (ListView) findViewById(android.R.id.list);
ProgressDialog progress = new ProgressDialog(NewsActivity.this);
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
@Override
protected ArrayList<HashMap<String, String>> doInBackground(String... params) {
Log.d("doInBackgound","backgound is running");
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
Log.d("path_parsing", "before parsing");
try {
// Getting Array of Contacts
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Contacts
for(int i = products.length()-1; i >=0; i--){
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String cid = c.getString(TAG_CID).toString();
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_CID, cid);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
mylist.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
Log.d("path_parsing", "after parsing");
return mylist;
}
@Override
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
if(progress.isShowing()){
progress.dismiss();
}
ListAdapter adapter = new SimpleAdapter(NewsActivity.this, result , R.layout.list_item,new String[] { TAG_NAME,}, new int[] {
R.id.name});
lv.setAdapter(adapter);
lv.setTextFilterEnabled(true);
Log.d("postExecute","Postexecute is running");
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progress.setTitle("Progress");
progress.setMessage("Please have patience");
progress.show();
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, v.getId(), 0, "Share");
}
}
请帮助我。我是安卓新手。