如何將ArrayList發送到BaseAdapter Android

Question

我想顯示我的JSON到gridview，之前..我顯示我的JSON到ListView，它的工作原理。但在BaseAdapter，我不知道怎麼送我的JSON，我已經投入到ArrayList的底座適配器

，所以這是我的源代碼：

活動：

public class MainActivity extends ListActivity { 
    List AgenList = new ArrayList(); 
     boolean boolStatusKoneksi=true; 
     private ProgressDialog Dialog; 
     protected Context applicationContext; 
     @Override 
     public void onCreate(Bundle savedInstanceState){ 
      super.onCreate(savedInstanceState);  
      setContentView(R.layout.activity_main); 
      new AgenAsyncTask().execute(); 
      GridView gridview = (GridView) findViewById(R.id.gridview); 
      gridview.setAdapter(new AgenAdapter(this)); 
     } 


    public class AgenAsyncTask extends AsyncTask<String, String, String> 
    { 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      Dialog = new ProgressDialog(MainActivity.this); 
      Dialog.setMessage("Mohon Tunggu sebentar..."); 
      Dialog.setIndeterminate(false); 
      Dialog.setCancelable(true); 
      Dialog.show(); 
     } 


     protected String doInBackground(String... args) { 

       String url = ("http:10.10.2/selectAgent.htm"); 

        try{ 
         JSONParser j=new JSONParser(); 
         JSONArray jsonArray = j.takeJson(url);; 

         for(int i =0; i<jsonArray.length(); i++){ 
          JSONObject c = jsonArray.getJSONObject(i); 


          HashMap<String, String> map = new HashMap<String, String>(); 
          if (c.has("atasan")) 
           map.put("atasan", c.get("atasan").toString()); 
          if (c.has("nama_agen")) 
           map.put("nama_agen", c.get("nama_agen").toString()); 
          if (c.has("kode_agen")) 
           map.put("kode_agen", c.get("kode_agen").toString()); 
          if (c.has("no_aaji")) 
           map.put("no_aaji", c.get("no_aaji").toString()); 
          if (c.has("jenis")) 
           map.put("jenis", c.get("jenis").toString()); 
           AgenList.add(map); 
         } 
        } catch (JSONException e) { 
         e.printStackTrace(); 
         } 
        return null; 
        } 


     @Override 
     protected void onPostExecute(String file_url) { 

     } 
    } 

這是我的BaseAdapter：

public class AgenAdapter extends BaseAdapter { 

     public AgenAdapter(MainActivity mainActivity) { 

     } 

     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      return 0; 
     } 

     @Override 
     public Object getItem(int position) { 
      // TODO Auto-generated method stub 
      return null; 
     } 

     @Override 
     public long getItemId(int position) { 
      // TODO Auto-generated method stub 
      return 0; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      LayoutInflater layout = getLayoutInflater(); 
      View view= layout.inflate(R.layout.list_item,parent,false); 

      TextView ATASAN = (TextView) findViewById(R.id.atasan); 
      TextView NAMA_AGEN= (TextView) findViewById(R.id.nama_agen); 
      TextView KODE_AGEN= (TextView) findViewById(R.id.kode_agen); 
      TextView NO_AAJI= (TextView) findViewById(R.id.no_aaji); 
      TextView JENIS= (TextView) findViewById(R.id.jenis); 
      return view; 
     } 
    } 
} 

正如你看到的，我有命名爲= AgenList ArrayList的，但我沒有把它放到我的BaseAdapter。

Answer 1

做一個參數化的構造函數，並將你的數組列表傳遞給它的參數。所以你的班級將會像

public class AgenAdapter extends BaseAdapter { 
List<yourObj> list; 
Activity a; 
    public AgenAdapter(Activity activity,List<yourObj> list) { 
     this.a=activity; 
     this.list=list; 

    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return list.size();///////return size of list 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return position;///// dont return null here 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position;/////////return position as itemID 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     LayoutInflater layout = getLayoutInflater(); 
     View view= layout.inflate(R.layout.list_item,parent,false); 

     TextView ATASAN = (TextView) findViewById(R.id.atasan); 
     TextView NAMA_AGEN= (TextView) findViewById(R.id.nama_agen); 
     TextView KODE_AGEN= (TextView) findViewById(R.id.kode_agen); 
     TextView NO_AAJI= (TextView) findViewById(R.id.no_aaji); 
     TextView JENIS= (TextView) findViewById(R.id.jenis); 
     return view; 
    } 
} 

Answer 2

試試這個。

gridview.setAdapter(new AgenAdapter(this), AgenList); 

並使用您的onPostExecute這一行（）代替的onCreate（）

像這樣：

@Override 
    protected void onPostExecute(String file_url) { 
    gridview.setAdapter(new AgenAdapter(this), AgenList); 

    } 

Answer 3

看一看ArrayAdapter。它包含基於ArrayList的適配器的所有實現。

1. 使您的適配器成爲ArrayAdapter的子類，給出參數化類型。在這種情況下你是Map<String, String>

   public class ResultAdapter extends ArrayAdapter<Map<String,String>> { 
   
       private int mResource; 
   
       /** 
       * @param context 
       * @param resource 
       */ 
       public ResultAdapter(Context context, int resource, ArrayList<Map<String,String>> dataList) { 
        super(context, resource, dataList); 
        this.mResource = resource; 
       } 
   
       ... 
   
   } 
   

2. 覆蓋一個ArrayAdapter的getView方法用來設置給予視圖中的數據。

   @Override 
   public View getView(int position, View convertView, ViewGroup parent) { 
       View view; 
       // If the view is already inflated, reuse it. 
       // Else inflate the view 
       if (convertView != null) { 
        view = convertView; 
       } else { 
        //inflate view 
        final LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        view = inflater.inflate(mResource, parent, false); 
       } 
   
       TextView ATASAN = (TextView) findViewById(R.id.atasan); 
       ... 
   
   
       //Get data here 
       Map<String, String> item = getItem(position); 
   
       //Set data to the View's e.g. 
       ATASAN.setText(item.get("ATASAN")); 
       ... 
   
       return view; 
   }