每當我滾動隨機物品時改變項目背景顏色也改變背景顏色

Question

每次我改變物品背景顏色當我滾動隨機物品時也改變背景顏色，我不知道爲什麼 另一件事情發生了是，如果該項目沒有在屏幕上顯示它並沒有改變背景顏色

這裏是我的代碼：

public class MyActivity extends ListActivity { 

char[] items = { 'e', 'f', 'f', 'f', 'e', 'f', 'e', 'e', 'f', 'f', 'e', 'e', 'f', 'f', 'f', 'e', 'e', 'f', 'f', 'e', 'e', 'f', 'f', 'f', 'e', 'e', 'f', 'f', 'e', 'e', 'f', 'f', 'f', 'e', 'e', 'f', 'f', 'p', 'e', 'e', 'p', 'f', 'f', 'f', 'e', 'e', 'a', 'f', 'p', 'f', 'e', 'e', 'f', 'f', 'p', 'f', 'e', 'a', 'e', 'p', 'f', 'f', 'e', 'p', 'e', 'f', 'f', 'f', 'a', 'p', 'e', 'e', 'p', 'f', 'f', 'e', 'p', 'e', 'f', 'p', 'f', 'e', 'f', 'e', 'f' }; 
int[] horas = {00, 01, 03, 04, 04, 05, 05, 05, 06, 06, 06, 06, 07, 07, 07, 07, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 21, 21, 21, 22, 22, 23, 23,}; 
int[] minutos = {20, 00, 00, 00, 30, 10, 25, 40, 10, 20, 40, 50, 00, 10, 30, 50, 00, 20, 40, 00, 10, 20, 30, 50, 10, 20, 40, 00, 20, 30, 40, 50, 10, 30, 40, 10, 20, 30, 40, 50, 00, 00, 10, 30, 50, 00, 10, 20, 30, 40, 00, 10, 30, 50, 50, 00, 10, 20, 20, 30, 40, 00, 20, 30, 30, 50, 10, 20, 20, 30, 30, 40, 50, 00, 20, 40, 50, 50, 10, 15, 30, 00, 40, 10, 50}; 
String[] total = new String[horas.length]; 

// declare class variables 
private ArrayList<Item> m_parts = new ArrayList<Item>(); 
private Runnable viewParts; 
private ItemAdapter m_adapter; 

/** Called when the activity is first created. */ 
public void onCreate(Bundle savedInstanceState) { 

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

    for (int i = 0; i < items.length; i++) { 
     total[i] = String.format("%02d",horas[i]) + ":" + String.format("%02d",minutos[i]); 
    } 

    int cuantos_f = cuantosF('f'); 

    // instantiate our ItemAdapter class 
    m_adapter = new ItemAdapter(this, R.layout.row, m_parts); 

    for (int i = 0; i < items.length; i++) { 
     m_parts.add(new Item(horas[i], minutos[i], items[i], total[i])); 
    } 

    m_adapter = new ItemAdapter(MyActivity.this, R.layout.row, m_parts); 

    // display the list. 
    setListAdapter(m_adapter); 

    final Button prox = (Button) findViewById(R.id.prox); 
    prox.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      mostrarSiguiente(); 
     } 
    }); 

    final Handler mHandler = new Handler(); 


    new Thread(new Runnable() { 
     @Override 
     public void run() { 
      // TODO Auto-generated method stub 
      while (true) { 
       try { 
        Thread.sleep(1000); 
        mHandler.post(new Runnable() { 

         @Override 
         public void run() { 
          // TODO Auto-generated method stub 
          // Write your code here to update the UI. 
          m_adapter.notifyDataSetChanged(); 
         } 
        }); 
       } catch (Exception e) { 
        // TODO: handle exception 
       } 
      } 
     } 
    }).start(); 

} 

private int cuantosF(char mi_char) { 
    int cant = 0; 
    for (int i = 0; i < horas.length; i++) { 
     if(items[i] == mi_char){ 
      cant++; 
     } 
    } 
    return cant; 
} 

private void mostrarSiguiente() { 
    Calendar rightNow = Calendar.getInstance(); 
    int hour = rightNow.get(Calendar.HOUR_OF_DAY); 
    int min = rightNow.get(Calendar.MINUTE); 

    int mejor_pos = 999, menor_resta = 1500; 

    for (int i = 0; i < horas.length; i++) { 
     if((horas[i]*60 + minutos[i] - (hour*60+min)) > 0){ 
      if ((horas[i]*60 + minutos[i] - (hour*60+min)) < menor_resta){ 
       mejor_pos = i; 
       menor_resta = (horas[i]*60 + minutos[i] - (hour*60+min)); 
      } 
     } 
    } 

    ChangeColors(mejor_pos); 

} 

void ChangeColors(final int numero){ 
    getListView().smoothScrollToPosition(numero); 

    ListView lv = getListView(); 
    lv.setCacheColorHint(0); 
    final View view = getViewByPosition(numero, lv); 

    changeColor(numero,view); 


} 
void changeColor (int numero, View v){ 
    v.setBackgroundColor(Color.parseColor("#3a536b")); 
} 
public View getViewByPosition(int position, ListView listView) { 
    final int firstListItemPosition = listView.getFirstVisiblePosition(); 
    final int lastListItemPosition = firstListItemPosition + listView.getChildCount() - 1; 

    if (position < firstListItemPosition || position > lastListItemPosition) { 
     return listView.getAdapter().getView(position, null, listView); 
    } else { 
     final int childIndex = position - firstListItemPosition; 
     return listView.getChildAt(childIndex); 
    } 
} 
} 

在先進的感謝！

Answer 1

看看在這個答案的getView（）方法：https://stackoverflow.com/a/25457446/617044

您需要設置getView（），這樣你的意見可以回收再利用。