如何在用戶輸入文字時使用光標更新列表視圖

Question

我完全難住！我一直在尋找年齡，但找不到解決方案。我有一種感覺，它會很容易！

Anway，我有一個綁定到遊標的listview，並且每次用戶輸入一個字母時，我都希望listview能夠搜索數據庫並返回結果。這聽起來很容易，但我無法弄清楚。先謝謝您的幫助。

這裏是我的代碼至今：

public class MyList extends ListActivity { 


    public static final String KEY_ROWID = "headwords._id"; 
    public static final String KEY_WORDS = "headwords.words"; 
    private ListAdapter adapter; 
    private DbManager myDb; 


    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     setContentView(R.layout.item_list); 


     myDb = new DbManager(this); 
     myDb.open(); 
     Cursor mCursor = myDb.startsWith("a"); 
     startManagingCursor(mCursor); 



     try { 
     adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, mCursor, 
       new String[] { KEY_WORDS, KEY_ROWID }, 
       new int[] { android.R.id.text1, android.R.id.text2 }); 
       setListAdapter(adapter); 

     } catch (Exception e) { 
      Log.i("adapter error Here!", ">>>>>>>>>>> Error!" + e.toString()); 
     } 








     EditText myET = (EditText) findViewById(R.id.search_text); 
     myET.addTextChangedListener(new TextWatcher() { 
      @Override 
      public void onTextChanged(CharSequence s, int start, int before, int count) { 
       //code which would change listview to only show item that match what is being typed in 
      } 

      @Override 
      public void afterTextChanged(Editable s) { 
      } 

      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, 
        int after) {  
      } 

     }); 

    } 

Answer 1

先mCursor成員：

private Cursor mCursor; 

@Override 
public void onCreate(Bundle icicle) { 
    mCursor = myDb.startsWith("a"); 
} 

然後在我的例子，我走的是CharSequence的第一個字母，但是這可能不是做你想做的事情，但關鍵是changeCursor（）;

@Override 
public void onTextChanged(CharSequence s, int start, int before, int count) { 
    mCursor = myDb.startsWith(s.toString.substring(0,1)); 
    adapter.changeCursor(mCursor); 
}