当数据量较大，listview超过一屏时convertview重用就会出现问题，因此在此做出了一点点改进，以适用于大量数据的情形：
public class ListAdapter extends BaseAdapter {
private Context mContext;
private View mLastView;
private int mLastPosition;
private int mLastVisibility;
public ListAdapter(Context context) {
this.mContext = context;
mLastPosition = -1;
}
@Override
public int getCount() {
return 30;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder;
if(convertView == null ) {
LayoutInflater inflater = LayoutInflater.from(mContext);
convertView = inflater.inflate(R.layout.list_item, null);
holder =new Holder();
holder.textView = (TextView)convertView.findViewById(R.id.textView);
holder.UEFAView = (ImageView)convertView.findViewById(R.id.image_uefa);
holder.mascotView = (ImageView)convertView.findViewById(R.id.image_mascot);
holder.hint = convertView.findViewById(R.id.hint_image);
convertView.setTag(holder);
} else {
holder = (Holder) convertView.getTag();
}
if(mLastPosition == position){
holder.hint.setVisibility(mLastVisibility);
}else{
holder.hint.setVisibility(View.GONE);
}
holder.textView.setText("Hello,It is " + position);
return convertView;
}
class Holder {
TextView textView;
ImageView UEFAView;
ImageView mascotView;
View hint;
}
public void changeImageVisable(View view,int position) {
if(mLastView != null && mLastPosition != position ) {
Holder holder = (Holder) mLastView.getTag();
switch(holder.hint.getVisibility()) {
case View.VISIBLE:
holder.hint.setVisibility(View.GONE);
mLastVisibility = View.GONE;
break;
default :
break;
}
}
mLastPosition = position;
mLastView = view;
Holder holder = (Holder) view.getTag();
switch(holder.hint.getVisibility()) {
case View.GONE:
holder.hint.setVisibility(View.VISIBLE);
mLastVisibility = View.VISIBLE;
break;
case View.VISIBLE:
holder.hint.setVisibility(View.GONE);
mLastVisibility = View.GONE;
break;
}
}
}
主要是增加了一个mLastVisibility记录对应mLsatPosition的视图可见属性。
干脆把其他的代码也贴出来吧：
public class ListViewTestActivity extends Activity implements OnItemClickListener{
private ListView mListView;
private ListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mListView = (ListView)findViewById(R.id.list);
mAdapter = new ListAdapter(this);
mListView.setAdapter(mAdapter);
mListView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
mAdapter.changeImageVisable(view, position);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="ListView Test" />
<ListView
android:id="@+id/list"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test"
android:textSize="20sp"
/>
<LinearLayout
android:id="@+id/hint_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="gone">
<ImageView
android:id="@+id/image_uefa"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_weight="1"
android:src="@drawable/uefa"
/>
<ImageView
android:id="@+id/image_mascot"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_weight="1"
android:src="@drawable/mascot"
/>
</LinearLayout>
</LinearLayout>
