爲2個條件排序列表視圖

我可以同時爲2個條件排序我的列表視圖嗎？我有4行：標題，描述，圖像的url和pinned.I必須顯示記錄在頂部固定== true，然後我必須排序字母標題行，在顯示後固定==真正的lines.How可以做到這一點？MainActivity和適配器放在下面。 MainActivity：爲2個條件排序列表視圖

public class MainActivity extends ListActivity { 
private Context context; 
SqlHelper dbHelper; 
    Intent intent; 
    private static String url = "https://fierce-citadel-4259.herokuapp.com/hamsters"; 
    private static final String TITLE = "title"; 
    private static final String DESCRIPTION = "description"; 
    private static final String IMAGE = "image"; 
    private static final String PINNED = "pinned"; 

    ArrayList<HashMap<String,String>> jsonlist = new ArrayList<HashMap<String, String>>(); 
    ArrayList<HashMap<String,String>> bdList = new ArrayList<HashMap<String, String>>(); 
    ListView lv; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     ActionBar actbar = getActionBar(); 
     actbar.setDisplayShowHomeEnabled(false); 
     actbar.setDisplayShowTitleEnabled(false); 
     actbar.setDisplayUseLogoEnabled(false); 
     lv=(ListView) findViewById(android.R.id.list); 
     LayoutInflater mInflater =LayoutInflater.from(MainActivity.this); 
     View mcustomview = mInflater.inflate(R.layout.customactionbar, null); 
     ImageButton imgbutt =(ImageButton)mcustomview.findViewById(R.id.actbarimagebutton); 
     imgbutt.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       new ProgressTask(MainActivity.this).execute(); 
      } 

     }); 
     actbar.setCustomView(mcustomview); 
     actbar.setDisplayShowCustomEnabled(true); 
     if(isNetworkConnected()==true) { 
      new ProgressTask(MainActivity.this).execute(); 
      ForItemClick(); 
     } 
     else { 
      try { 
       dbHelper = new SqlHelper(MainActivity.this); 
       WithoutInternetItemClick(); 
       imgbutt.setClickable(false); 
      } catch (SQLException e) { 
       e.printStackTrace(); 
      } 
      displaysavedlv(); 

     } 



    } 

    private class ProgressTask extends AsyncTask<String,Void,Boolean> { 
     private ProgressDialog dialog; 
     private ListActivity activity; 
     private Context context; 

     public ProgressTask(MainActivity activity) { 
      this.activity = activity; 
      context = activity; 
      dialog = new ProgressDialog(context); 
      try { 
       dbHelper = new SqlHelper(MainActivity.this); 
      } catch (SQLException e) { 
       e.printStackTrace(); 
      } 
     } 

     protected void onPreExecute(){ 
      this.dialog.setMessage("Progress start"); 
      this.dialog.show(); 
     } 
     protected void onPostExecute(final Boolean success){ 
      try{ 
     if((this.dialog != null)&& this.dialog.isShowing()){ 
this.dialog.dismiss(); 
      } 
if(isNetworkConnected()==true) { 
    CustomListAdapter adapter = new CustomListAdapter(MainActivity.this, jsonlist, R.layout.list_item, new String[]{TITLE, DESCRIPTION}, new int[]{R.id.title, R.id.description}); 
    lv.setAdapter(adapter); 
}else{ 
    displaysavedlv(); 
} 


     }catch (final IllegalArgumentException e){e.printStackTrace();} 
     } 
     protected Boolean doInBackground(String... args) { 

      JSONParser jParser = new JSONParser(); 
      JSONArray json = jParser.getJSONFromUrl(url); 
      for(int i =0;i<json.length();i++) { 
       try { 
        JSONObject c = json.getJSONObject(i); 
        String vtitle = c.getString(TITLE); 
        String vdescription = c.getString(DESCRIPTION); 
        String vimage = c.getString(IMAGE); 
        Boolean vpinned = c.getBoolean(PINNED); 
        dbHelper.open(); 
dbHelper.createEntry(vtitle, vimage, vdescription); 

        dbHelper.close(); 
        HashMap<String, String> map = new HashMap<>(); 
        map.put(TITLE, vtitle); 
        map.put(DESCRIPTION, vdescription); 
map.put(IMAGE, vimage); 
        map.put(PINNED, String.valueOf(vpinned)); 
        jsonlist.add(map); 

       } catch (JSONException e) { 
        e.printStackTrace(); 
       } catch (SQLException e) { 
        e.printStackTrace(); 
       } 
      } 

      return null; 
     } 
    } 

    private boolean isNetworkConnected() { 
     ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
     NetworkInfo ni = cm.getActiveNetworkInfo(); 
     if (ni == null) { 
      // There are no active networks. 
      return false; 
     } else 
      return true; 
    } 
    public void ForItemClick(){ 

     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       String title1 = jsonlist.get(position).get("title"); 
       String description1 = jsonlist.get(position).get("description"); 
       String url1 = jsonlist.get(position).get("image"); 

       intent = new Intent(MainActivity.this, DetailInfo.class); 


       intent.putExtra("title", title1); 
       intent.putExtra("description", description1); 
       intent.putExtra("url", url1); 
       startActivity(intent); 


    } 
}); 
    }; 
    private void displaysavedlv(){ 
     bdList = dbHelper.getAllData(); 
lv=(ListView) findViewById(android.R.id.list); 
     CustomListAdapter adapter1 = new CustomListAdapter(MainActivity.this,bdList,R.id.list_item,new String[]{TITLE,DESCRIPTION},new int[]{R.id.title,R.id.description}); 
     lv.setAdapter(adapter1); 


    } 
    public void WithoutInternetItemClick(){ 
     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       String title1 = bdList.get(position).get("title"); 
       String description1 = bdList.get(position).get("description"); 
       String url1 = bdList.get(position).get("image"); 
       intent = new Intent(MainActivity.this, DetailInfo.class); 


       intent.putExtra("title", title1); 
       intent.putExtra("description", description1); 
       intent.putExtra("url", url1); 
       startActivity(intent); 
      } 
     }); 


    } 
}

適配器：

public class CustomListAdapter extends SimpleAdapter { 
    private static final String IMAGE = null; 
private final Activity context; 
private ArrayList<HashMap<String, String>> result; 
    public CustomListAdapter(Activity context, ArrayList<HashMap<String, String>> data, int resource, String[] from, int[] to) { 
     super(context,data,resource,from,to); 
     // TODO Auto-generated constructor stub 

this.result = data; 
     this.context = context; 
    } 

    public View getView(int position,View view,ViewGroup parent) { 
     LayoutInflater inflater=context.getLayoutInflater(); 
     View rowView=inflater.inflate(R.layout.list_item, null, true); 


     ImageView imageView = (ImageView) rowView.findViewById(R.id.image); 
TextView title = (TextView) rowView.findViewById(R.id.title); 
     title.setText(result.get(position).get("title")); 
TextView description = (TextView) rowView.findViewById(R.id.description); 
     description.setText(result.get(position).get("description")); 
String url = result.get(position).get("image"); 
      Picasso.with(context) 
       .load(url).into(imageView); 


     return rowView; 

    } 


}

來源

2015-09-26 Rostislav Prozorovsky

設置一個實現您業務規則的Comparator，然後使用該Comparator對您的模型集合進行排序（）。 – CommonsWare

在坐你的對象延長可比等於和的compareTo

@Override 
public boolean equals(Object2 obj) { 
    if (obj == null) 
     return false; 
    if (!(obj instanceof Messages)) 
     return false; 
    Object1 u = (Object1) obj; 

    return this.gettitle() == u.gettitle() 
} 

@Override 
public int compareTo(Object2 obj) { 
    return String.valueOf(this.title).compareTo(obj.title); 
}

來源

2015-09-26 11:32:20

如果我按照你的問題比你可以做這樣的事情。

你甚至可以定義在bean本身的比較，這樣就可以代替重用每次重建他們的他們：

public class Contact { 

    private String name; 
    private String phone; 
    private Address address; 

    // ... 

    public static Comparator<Contact> COMPARE_BY_PHONE = new Comparator<Contact>() { 
     public int compare(Contact one, Contact other) { 
      return one.phone.compareTo(other.phone); 
     } 
    }; 

    public static Comparator<Contact> COMPARE_BY_ADDRESS = new Comparator<Contact>() { 
     public int compare(Contact one, Contact other) { 
      return one.address.compareTo(other.address); 
     } 
    }; 

}

可以如下使用：

List<Contact> contacts = new ArrayList<Contact>(); 
// Fill it. 

// Sort by address. 
Collections.sort(contacts, Contact.COMPARE_BY_ADDRESS); 

// Sort later by phone. 
Collections.sort(contacts, Contact.COMPARE_BY_PHONE);

瞭解詳情，請可以看到here。

來源

2015-09-26 13:04:58

爲2個條件排序列表視圖

回答

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