如何使用ListActivity上的对象属性对JSON数组进行排序？

Question

我实现了一个JSONArray来填充一个ListView。现在我想按照名称的字母顺序排列ListActivity上的项目，这是它的对象属性。 我怎样才能整理出来？

继承人的Object类我用它来实现ListView控件：

public class VideoLocation { 

    public String deleted_at = null; 
    public int documentary_video_length = -1; 
    public int id = -1; 
    public double latitude = 0d; 
    public double longitude = 0d; 
    public int position = -1; 
    public String updated_at = null; 
    public String name = null; 
    public String text = null; 
    public String documentary_video_url = null; 
    public String documentary_thumbnail_url = null; 
    public String audio_text_url = null; 
    public Footage[] footages = null; 

    public VideoLocation(){ 

    } 

和这里的ListActivity类：

public class ProjectsList extends ListActivity implements OnItemClickListener, VideoLocationReceiver{ 
     /** Called when the activity is first created. */ 

     private VideoLocation[] videoLocations = null; 
     private VideoLocationAdapter videoLocationAdapter = null; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 

      super.onCreate(savedInstanceState); 
      setContentView(R.layout.projects_list); 

      doSync(); 
      //storeSharedPrefs(); 
      ListView lv = getListView(); 
      lv.setOnItemClickListener(this); 

      videoLocationAdapter = new VideoLocationAdapter(ProjectsList.this, 
        R.layout.listitems, 
        new VideoLocation[0]); 
      lv.setAdapter(videoLocationAdapter); 

      //CREATE VideoLocation[] from Database! 

      JsonDB dbhelper = new JsonDB(ProjectsList.this); 
      SQLiteDatabase db = dbhelper.getWritableDatabase(); 

      db.beginTransaction(); 
      videoLocations = dbhelper.getVideoLocations(db); 
      db.setTransactionSuccessful();//end transaction 
      db.endTransaction(); 
      db.close(); 
     } 

     @Override 
     public void onResume(){ 
      super.onResume(); 
      DBSync.setVideoLocationReceiver(ProjectsList.this); 
     } 

     @Override 
     public void onPause(){ 
      super.onResume(); 
      DBSync.setVideoLocationReceiver(null); 
     } 

     @Override 
     public void onItemClick(AdapterView<?> l, View v, int position, long id) { 
      Intent listIntent = new Intent(this, ProjectDetailsActivity.class); 

      VideoLocation vidLocation = videoLocations[position]; 
     listIntent.putExtra("documentary_video_url",vidLocation.documentary_video_url); 
      startActivity(listIntent); 

     } 
protected void storeSharedPrefs() { 
     final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); 
     if (prefs.getBoolean("first-time", true)) { 
      doSync(); 
      prefs.edit().putBoolean("first-time", false).commit(); // record the fact that the app has been started at least once 
     } 
    } 

    void doSync() { 
     Intent serviceIntent = new Intent(this, DBSync.class); 
     startService(serviceIntent); 
    } 

    public class VideoLocationAdapter extends ArrayAdapter<VideoLocation> { 
     public ImageLoader imageLoader; 
     ImageLoader loader = null; 

     public VideoLocationAdapter(Context context, int resource, VideoLocation[] vidLocs) { 
      super(context, resource, vidLocs); 
      ProjectsList.this.videoLocations = vidLocs;  
      loader = new ImageLoader(context); 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 

      if(convertView == null){ 
       convertView = ProjectsList.this.getLayoutInflater().inflate(R.layout.listitems, null, true); 
      } 

      VideoLocation vidLocation = videoLocations[position]; 
      ImageView v = (ImageView)convertView.findViewById(R.id.image); 
      String url = vidLocation.documentary_thumbnail_url; 
      v.setTag(url); 
      loader.DisplayImage(url, ProjectsList.this, v); 
      TextView titleView = (TextView)convertView.findViewById(R.id.txt_title); 
      titleView.setText(vidLocation.name); 
      return convertView; 
     } 

     @Override 
     public int getCount(){ 
      return videoLocations==null?0:videoLocations.length; 
     } 

     @Override 
     public VideoLocation getItem(int position){ 
      return videoLocations[position]; 
     } 

     @Override 
     public boolean hasStableIds(){ 
      return true; 
     } 

     @Override 
     public boolean isEnabled(int position){ 
      return true; 
     } 

     @Override 
     public long getItemId(int position){ 
      return videoLocations[position].id; 
     } 

     public void setVideoLocationData(VideoLocation[] newData){ 
      ProjectsList.this.videoLocations = newData; 
      VideoLocationAdapter.this.notifyDataSetChanged(); 
     } 
    } 

    @Override 
    public void receivedVideoLocationData(VideoLocation[] vidLocs) { 
     final VideoLocation[] locs = vidLocs; 

     if (vidLocs==null) { 
      runOnUiThread(new Runnable() { 

       @Override 
       public void run() { 

        //show popup and inform about missing network 
       } 
      }); 
     }else{ 
      runOnUiThread(new Runnable() { 

       @Override 
       public void run() { 

        videoLocationAdapter.setVideoLocationData(locs); 
        Log.d("ProjectsList", "updating video locations..."); 
       } 
      }); 
     } 
    } 

} 

Answer 1

使用Collections.sort。解析你的json并用VideoLocation的实例填充一个vector或一个ArrayList（我认为）。然后调用Collections.sort。

编辑：

Collections.sort(youarrayList, new Comparator<VideoLocation>() { 

      @Override 
      public int compare(VideoLocation lhs, VideoLocation rhs) { 
       return lhs.name.compareTo(rhs.name); 
      } 
     }); 

Answer 2

在getVideoLocations(db)，你可能会告诉你的查询返回结果通过ORDER BY [专栏]