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public class ListViewAdapter extends BaseAdapter {
private Context context;
private LocationDetails[] locationDetails;
public ListViewAdapter(Context c, LocationDetails[] locationDetails) {
context = c;
this.locationDetails = locationDetails;
}
@Override
public int getCount() {
return locationDetails.length;
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
View list;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (view == null) {
list = new View(context);
list = inflater.inflate(R.layout.listview_layout, null);
TextView name = (TextView) list.findViewById(R.id.location_name);
TextView desc = (TextView) list.findViewById(R.id.location_desc);
ImageView img = (ImageView) list.findViewById(R.id.location_image);
name.setText(locationDetails[i].getLocationName());
desc.setText(locationDetails[i].getLocationDesc());
img.setImageResource(locationDetails[i].getLocationIcon());
} else {
list = (View) view;
}
return list;
}
}
这段代码是我使用viewholder之前的代码,效果很好。然后我尝试用viewholder修改,用gradle编译,所有的image和textviews都不见了,不知道下面的代码有什么问题。为什么我无法在屏幕上显示任何内容?
public class LocationAdapter extends BaseAdapter {
private Context context;
private LocationDetails[] locationDetails;
public LocationAdapter(Context c, LocationDetails[] locationDetails) {
context = c;
this.locationDetails = locationDetails;
}
@Override
public int getCount() {
return locationDetails.length;
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
View list = view;
ViewHolder vh;
if (list == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
list = inflater.inflate(R.layout.listview_layout, null);
vh = new ViewHolder();
vh.name = (TextView) list.findViewById(R.id.location_name);
vh.desc = (TextView) list.findViewById(R.id.location_desc);
vh.img = (ImageView) list.findViewById(R.id.location_image);
list.setTag(vh);
} else {
vh = (ViewHolder) list.getTag();
}
return list;
}
static class ViewHolder {
TextView name;
TextView desc;
ImageView img;
}
}
最佳答案
public class LocationAdapter extends BaseAdapter {
private Context context;
private LocationDetails[] locationDetails;
Object model;
public LocationAdapter(Context c, LocationDetails[] locationDetails) {
context = c;
this.locationDetails = locationDetails;
}
@Override
public int getCount() {
return locationDetails.length;
}
@Override
public Object getItem(int i) {
return i;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
View list = view;
ViewHolder vh;
if (list == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
list = inflater.inflate(R.layout.listview_layout, null);
vh = new ViewHolder();
vh.name = (TextView) list.findViewById(R.id.location_name);
vh.desc = (TextView) list.findViewById(R.id.location_desc);
vh.img = (ImageView) list.findViewById(R.id.location_image);
list.setTag(vh);
} else {
vh = (ViewHolder) list.getTag();
}
model = getItem(i);
vh.name.setText(model.getLocationName());
vh.desc.setText(model.getLocationDesc());
// same as image...
return list;
}
static class ViewHolder {
TextView name;
TextView desc;
ImageView img;
}
}
关于android - ViewHolder 不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39893619/
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