我有一个带有 viewList + 自定义适配器的活动。
我想在运行时更新 viewList(在某些资源完成下载时使用回调)。我调用 ui-thread 来调用这个方法:
public void refreshListIcons() {
if (categories != null) {
SettingsValue[] values = adapter.getValues();
for (int i = 0; i < values.length; i++) {
values[i].icon = ResManager
.GetSkinDrawable(categories[i].iconName + ".bin");
}
adapter.setValues(values);
mListView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
然后adapter.getView
调用该方法:
但为什么convertView==null
呢?
我理解第一次创建活动时。
但现在这是我第二次(运行时更新)。
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.settings_item, null);
}
...
}
它会导致重新充气太多次并使我的应用程序崩溃。
我的整个适配器的代码:
package com.waze.settings;
public class SettingValueAdapter extends BaseAdapter {
private SettingsValue[] values;
private LayoutInflater inflater;
public SettingValueAdapter(Context context) {
inflater = LayoutInflater.from(context);
}
public SettingsValue[] getValues() {
return values;
}
@Override
public int getCount() {
if (values == null) {
return 0;
}
return values.length;
}
@Override
public Object getItem(int arg0) {
return values==null? null : values[arg0];
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.settings_item, null);
}
SettingsValue item = values[position];
CheckedTextView name = (CheckedTextView) convertView.findViewById(R.id.itemText);
ImageView iconView = (ImageView) convertView.findViewById(R.id.itemIcon);
if (iconView != null && (item != null) && (item.icon != null)) {
iconView.setImageDrawable(item.icon);
iconView.setVisibility(View.VISIBLE);
} else {
iconView.setVisibility(View.GONE);
}
name.setText(item.display);
name.setChecked(item.isSelected);
View container = convertView.findViewById(R.id.itemContainer);
if (position == 0) {
if (position == values.length-1) {
container.setBackgroundResource(R.drawable.item_selector_single);
} else {
container.setBackgroundResource(R.drawable.item_selector_top);
}
} else {
if (position == values.length-1) {
container.setBackgroundResource(R.drawable.item_selector_bottom);
} else {
container.setBackgroundResource(R.drawable.item_selector_middle);
}
}
container.setPadding(0, 0, 0, 0);
return convertView;
}
public void setValues(SettingsValue[] values) {
this.values = values;
notifyDataSetChanged();
}
}