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我正在使用ListView的自定義數據適配器，它列出了我的應用程序中的一些類別。當我添加一個新的類別或滾動ListView每個項目混合，不知何故它不會爲新添加的數據創建一個新的項目。這是我的自定義適配器的代碼;Android DataAdapter混合數據值
public class CategoryAdapter extends BaseAdapter {
List<Category> mList;
Context mContext;
public CategoryAdapter(Context context, List<Category> data) {
mList = data;
mContext = context;
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
if (position < 0 || position >= mList.size())
return null;
return mList.get(position);
}
@Override
public long getItemId(int position) {
if (position < 0 || position >= mList.size())
return -1;
return mList.get(position).getId();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
CategoryDelegate del;
if (convertView == null) {
System.out.println("CV Null pos: " + position);
del = new CategoryDelegate(mContext, mList.get(position));
int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 67, parent.getResources().getDisplayMetrics());
del.setLayoutParams(new ListView.LayoutParams(LayoutParams.MATCH_PARENT, height));
} else {
System.out.println("CV EXIST pos: " + position + "/" + mList.get(position).getTitle() + " =? " + ((CategoryDelegate) convertView).getCategory().getTitle());
del = (CategoryDelegate) convertView;
}
return del;
}
public void setData(List<Category> data) {
mList = data;
notifyDataSetChanged();
}
public class CategoryDelegate extends LinearLayout {
private TextView mTitle;
private TextView mCount;
private Category mCategory;
public CategoryDelegate(Context context, Category category) {
super(context);
mCategory = category;
Resources res = getResources();
//leftMargin = 11dp; textAlignVCenter; fontSize = 20dp(sp!); color = Color.rgb(149, 155, 171);
mTitle = new TextView(context);
mTitle.setTextColor(Color.rgb(149, 155, 171));
mTitle.setGravity(Gravity.CENTER_VERTICAL);
mTitle.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 20);
mTitle.setText(category.getTitle());
LayoutParams titleParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
titleParams.leftMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 11, res.getDisplayMetrics());
titleParams.weight = 1;
mTitle.setLayoutParams(titleParams);
addView(mTitle);
//rightMargin = 10dp; textAlignVCenter; fontSize = 15dp(sp!); color = Color.rgb(149, 155, 171);
mCount = new TextView(context);
mCount.setTextColor(Color.rgb(149, 155, 171));
mCount.setGravity(Gravity.CENTER_VERTICAL);
mCount.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 20);
mCount.setText(String.valueOf(category.getSize()));
LayoutParams countParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
countParams.gravity = Gravity.RIGHT;
countParams.rightMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 13, res.getDisplayMetrics());
mCount.setLayoutParams(countParams);
addView(mCount);
}
public Category getCategory() {
return mCategory;
}
}
當我添加一個新的類別或向下滾動到列表中，在getView if (convertView == null) {從來沒有工作，我不知道爲什麼，而是去現有convertView和所有數據點之後混合起來。任何想法如何可以使這個適配器工作？