语法错误导致其他错误，实际是上了个括号

 1 package com.bignerdranch.android.nerdlauncher;
 2 
 3 import java.util.Collections;
 4 import java.util.Comparator;
 5 import java.util.List;
 6 
 7 import android.content.Intent;
 8 import android.content.pm.ActivityInfo;
 9 import android.content.pm.PackageManager;
10 import android.content.pm.ResolveInfo;
11 import android.os.Bundle;
12 import android.support.v4.app.ListFragment;
13 import android.util.Log;
14 import android.view.View;
15 import android.view.ViewGroup;
16 import android.widget.ArrayAdapter;
17 import android.widget.ListView;
18 import android.widget.TextView;
19 
20 public class NerdLauncherFragment extends ListFragment {
21     private static final String TAG="NerdLauncherFragment";
22      @Override
23         public void onCreate(Bundle savedInstanceState) {
24             super.onCreate(savedInstanceState);
25             setRetainInstance(true);
26 
27             Intent startupIntent = new Intent(Intent.ACTION_MAIN);
28             startupIntent.addCategory(Intent.CATEGORY_LAUNCHER);
29 
30             final PackageManager pm = getActivity().getPackageManager();
31             List<ResolveInfo> activities = pm.queryIntentActivities(startupIntent, 0);
32 
33             Log.i(TAG, "I‘ve found " + activities.size() + " activities.");
34 
35             Collections.sort(activities, new Comparator<ResolveInfo>() {
36                 public int compare(ResolveInfo a, ResolveInfo b) {
37                     return String.CASE_INSENSITIVE_ORDER.compare(
38                         a.loadLabel(pm).toString(),
39                         b.loadLabel(pm).toString()); 
40                 } 
41             });
42 
43             setListAdapter(new ArrayAdapter<ResolveInfo>(getActivity(), android.R.layout.simple_list_item_1, 
44                 activities) {
45                 public View getView(int pos, View convertView, ViewGroup parent) {
46                     View v = super.getView(pos, convertView, parent);
47                     TextView tv = (TextView)v;
48                     ResolveInfo ri = getItem(pos);
49                     tv.setText(ri.loadLabel(pm));
50                     return v; 
51                 }
52             });
53      
54             @Override
55             public void onListItemClick(ListView l, View v, int position, long id) {
56                 ResolveInfo resolveInfo = (ResolveInfo)l.getAdapter().getItem(position);
57                 ActivityInfo activityInfo = resolveInfo.activityInfo;
58 
59                 if (activityInfo == null) return;
60 
61                 Intent i = new Intent(Intent.ACTION_MAIN);
62                 i.setClassName(activityInfo.applicationInfo.packageName, activityInfo.name);
63                 i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
64 
65                 startActivity(i);
66             }
67    }
68      
69 }