我有一个带GridView的应用程序，它包含60个元素......这是ImageAdapter的代码，它扩展了BaseAdapter以显示它们......
public class ImageAdapter extends BaseAdapter {
private Context context;
private final String[] mobileValues;
public ImageAdapter(Context context, String[] mobileValues) {
this.context = context;
this.mobileValues = mobileValues;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
if (convertView == null) {
gridView = new View(context);
// get layout from mobile.xml
gridView = inflater.inflate(R.layout.mobile, null);
// set value into textview
TextView textView = (TextView) gridView
.findViewById(R.id.grid_item_label);
textView.setText(mobileValues[position]);
// set image based on selected text
ImageView imageView = (ImageView) gridView
.findViewById(R.id.grid_item_image);
String mobile = mobileValues[position];
if (mobile.equals("Alfa Romeo")) {
imageView.setImageResource(R.drawable.alfa);
} else if (mobile.equals("Aston Martin")) {
imageView.setImageResource(R.drawable.aston);
} else if (mobile.equals("Audi")) {
imageView.setImageResource(R.drawable.audi);
} else if (mobile.equals("Bentley")) {
imageView.setImageResource(R.drawable.bentley);
} else if (mobile.equals("BMW")) {
imageView.setImageResource(R.drawable.bmw);
} else if (mobile.equals("Bugatti")) {
imageView.setImageResource(R.drawable.bugatti);
} else if (mobile.equals("Buick")) {
imageView.setImageResource(R.drawable.buick);
} else if (mobile.equals("Cadillac")) {
imageView.setImageResource(R.drawable.cadillac);
} else if (mobile.equals("Chery")) {
imageView.setImageResource(R.drawable.chery);
} else if (mobile.equals("Chevrolet")) {
imageView.setImageResource(R.drawable.chevrolet);
} else if (mobile.equals("Chrysler")) {
imageView.setImageResource(R.drawable.chrysler);
} else if (mobile.equals("Citroen")) {
imageView.setImageResource(R.drawable.citroen);
} else if (mobile.equals("Dacia")) {
imageView.setImageResource(R.drawable.dacia);
} else if (mobile.equals("Daewoo")) {
imageView.setImageResource(R.drawable.daewoo);
} else if (mobile.equals("Dodge")) {
imageView.setImageResource(R.drawable.dodge);
} else if (mobile.equals("Ferrari")) {
imageView.setImageResource(R.drawable.ferrari);
} else if (mobile.equals("Fiat")) {
imageView.setImageResource(R.drawable.fiat);
} else if (mobile.equals("Ford")) {
imageView.setImageResource(R.drawable.ford);
} else if (mobile.equals("Gaz")) {
imageView.setImageResource(R.drawable.gaz);
} else if (mobile.equals("Holden")) {
imageView.setImageResource(R.drawable.holden);
} else if (mobile.equals("Honda")) {
imageView.setImageResource(R.drawable.honda);
} else if (mobile.equals("Hyindai")) {
imageView.setImageResource(R.drawable.hyundai);
} else if (mobile.equals("Infinity")) {
imageView.setImageResource(R.drawable.infiniti);
} else if (mobile.equals("Jaguar")) {
imageView.setImageResource(R.drawable.jaguar);
} else if (mobile.equals("Jeep")) {
imageView.setImageResource(R.drawable.jeep);
} else if (mobile.equals("Kia")) {
imageView.setImageResource(R.drawable.kia);
} else if (mobile.equals("Lada")) {
imageView.setImageResource(R.drawable.lada);
} else if (mobile.equals("Lamborghini")) {
imageView.setImageResource(R.drawable.lamborghini);
} else if (mobile.equals("Lancia")) {
imageView.setImageResource(R.drawable.lancia);
} else if (mobile.equals("Land Rover")) {
imageView.setImageResource(R.drawable.land);
} else if (mobile.equals("Lexus")) {
imageView.setImageResource(R.drawable.lexus);
} else if (mobile.equals("Lotus")) {
imageView.setImageResource(R.drawable.lotus);
} else if (mobile.equals("Maserati")) {
imageView.setImageResource(R.drawable.maserati);
} else if (mobile.equals("Maybach")) {
imageView.setImageResource(R.drawable.maybach);
} else if (mobile.equals("Mazda")) {
imageView.setImageResource(R.drawable.mazda);
} else if (mobile.equals("Mercedes")) {
imageView.setImageResource(R.drawable.mercedes);
} else if (mobile.equals("Mercuri")) {
imageView.setImageResource(R.drawable.mercury);
} else if (mobile.equals("Mini")) {
imageView.setImageResource(R.drawable.mini);
} else if (mobile.equals("Mitshubishi")) {
imageView.setImageResource(R.drawable.mitsubishi);
} else if (mobile.equals("Nissan")) {
imageView.setImageResource(R.drawable.nissan);
} else if (mobile.equals("Opel")) {
imageView.setImageResource(R.drawable.opel);
} else if (mobile.equals("Pagani")) {
imageView.setImageResource(R.drawable.pagani);
} else if (mobile.equals("Peugeot")) {
imageView.setImageResource(R.drawable.peugeot);
} else if (mobile.equals("Pontiac")) {
imageView.setImageResource(R.drawable.pontiac);
} else if (mobile.equals("Porshe")) {
imageView.setImageResource(R.drawable.porshe);
} else if (mobile.equals("Renault")) {
imageView.setImageResource(R.drawable.renault);
} else if (mobile.equals("Rolls Royce")) {
imageView.setImageResource(R.drawable.rolls);
} else if (mobile.equals("Rover")) {
imageView.setImageResource(R.drawable.rover);
} else if (mobile.equals("Saab")) {
imageView.setImageResource(R.drawable.saab);
} else if (mobile.equals("Scion")) {
imageView.setImageResource(R.drawable.scion);
} else if (mobile.equals("Seat")) {
imageView.setImageResource(R.drawable.seat);
} else if (mobile.equals("Skoda")) {
imageView.setImageResource(R.drawable.skoda);
} else if (mobile.equals("Sssang Young")) {
imageView.setImageResource(R.drawable.ssang);
} else if (mobile.equals("Subaru")) {
imageView.setImageResource(R.drawable.subaru);
} else if (mobile.equals("Suzuki")) {
imageView.setImageResource(R.drawable.suzuki);
} else if (mobile.equals("Toyota")) {
imageView.setImageResource(R.drawable.toyota);
} else if (mobile.equals("Vauxhall")) {
imageView.setImageResource(R.drawable.vauxhall);
} else if (mobile.equals("Volkswagen")) {
imageView.setImageResource(R.drawable.volkswagen);
} else if (mobile.equals("Volvo")) {
imageView.setImageResource(R.drawable.volvo);
} else {
imageView.setImageResource(R.drawable.acura);
}
} else {
gridView = (View) convertView;
}
return gridView;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mobileValues.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
}
问题是 - 当我向下滚动网格视图时 - 它从一开始就开始显示元素....我的错误是什么????
答案 0 :(得分：4)
您没有正确使用convertView。适配器中的视图将被回收，以防止额外的视图创建。如果视图被回收，则会在convertView中传递。但重要的是，视图以前可能属于不同的项目。如果您不再次填充视图，它将包含不正确的数据 - 属于其他已回收项目的数据。
getView方法应包含以下内容：
public View getView(int position, View convertView, ViewGroup parent) {
View gridView;
if (convertView == null) {
// create new gridView here
} else {
// recycle the convertView
gridView = (View) convertView;
}
// fill the gridView here
return gridView;
}