Android從ArrayList中獲取值

Question

總體思路是根據放入其中的值在ListView中更改TextView的背景。

E.g.如果輸入的值爲真，則顏色會改變。

但是我遇到了麻煩的具體值，而不是字符串

這裏是我的控制器

public ArrayList<HashMap<String, String>> getAllSkills() { 
    Log.d(LOGCAT, "getAll"); 
    ArrayList<HashMap<String, String>> wordList; 
    wordList = new ArrayList<HashMap<String, String>>(); 
    String selectQuery = "SELECT * FROM " + "characterSkills"; 
    SQLiteDatabase database = this.getWritableDatabase(); 
    Cursor cursor = database.rawQuery(selectQuery, null); 
    if (cursor.moveToFirst()) { 
     do { 
      HashMap<String, String> map = new HashMap<String, String>(); 
      map.put("skillId", cursor.getString(0)); 
      map.put("skillName", cursor.getString(1)); 
      map.put("ability", cursor.getString(2)); 
      map.put("rank", cursor.getString(3)); 
      map.put("enabled", cursor.getString(4)); 
      wordList.add(map); 
     } while (cursor.moveToNext()); 
    } 
    return wordList; 
} 

正由這家名爲：

ArrayList<HashMap<String, String>> characterSkills = controller 
      .getAllSkills(); 

    ListAdapter adapter = new SimpleAdapter(CharacterSheet.this, 
      characterSkills, R.layout.dd_skill_entry, new String[] { 
        "skillId", "skillName", "ability", "rank", "enabled" }, 
      new int[] { R.id.skillid, R.id.skillname, R.id.ability, 
        R.id.rank, R.id.enabled }); 


    Toast.makeText(getApplicationContext(), "" + characterSkills.get(4), Toast.LENGTH_LONG).show(); 

    setListAdapter(adapter); 

的祝酒返回整個hashmap在那個位置，而不是我想要的「enabled」值。

所以我的問題是我如何得到這個值，如何檢查它的真實性，以及它是否改變了它輸入的特定視圖（R.id.enabled）的背景顏色。

Answer 1

我認爲做的最好的事情就是創建一個像

public class CharacterSkills { 

private long skillId; 
private String skillName; 
private boolean enabled; 

// TODO : make getters/setters 

} 

一個POJO，然後在函數中使用該POJO。像這樣的東西：

public List<CharacterSkills> getAllSkills() { 
    Log.d(LOGCAT, "getAll"); 
    List<CharacterSkills> wordList; 
    wordList = new ArrayList<CharacterSkills>(); 
    String selectQuery = "SELECT * FROM " + "characterSkills"; 
    SQLiteDatabase database = this.getWritableDatabase(); 
    Cursor cursor = database.rawQuery(selectQuery, null); 
    if (cursor.moveToFirst()) { 
     do { 
      CharacterSkills character = new CharacterSkills(); 
      character.setSkillId(cursor.getLong(0)); 
      character.setSkillName(cursor.getString(1)); 
      character.setEnabled(cursor.getInt(2) == 1 ? true : false); // there is no boolean in SQLite 
      // TODO : all informations about character 

      wordList.add(map); 
     } while (cursor.moveToNext()); 
    } 
    return wordList; 
} 

則可以使用自定義適配器

public class CharacterAdapter extends BaseAdapter { 
    private List<CharacterSkills> characters; 

    public CharacterAdapter(List<CharacterSkills> characters) { 
     this.characters = characters; 
    } 

    @Override 
    public int getCount() { 
     return characters.size(); 
    } 

    @Override 
    public CharacterSkills getItem(int position) { 
     return characters.get(position); 
    } 

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

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // You can use ViewHolder pattern to optimize your listview 
     convertView = LayoutInfalter.from(ctx).inflate(R.layout.dd_skill_entry, null); 
     TextView myCharacter = (TextView) convertView.findViewById(R.id.enabled); 
     CharacterSkills character = characters.get(position); 
     // TODO : define your background 
     if (character.isEnabled()) { 
      myCharacter.setBackgroundResource(R.drawable.yourdrawableenable); 
     } else { 
      myCharacter.setBackgroundResource(R.drawable.yourdrawabledisable); 
     } 
     return convertView; 
    } 

} 

最後，你可以用自己的適配器。

List<CharacterSkills> characters = controller.getAllSkills(); 
CharacterAdapter adapter = new CharacterAdapter(characters); 
setListAdapter(adapter);