我已经将值从fragment传递到mainactivity,同时单击fragment类中的按钮。我的主要活动有一个片段和一个带基本适配器的水平listview。我的水平listview有一个imageview和一个textview。我想在特定的水平列表项中设置值和图像。如果我必须单击fragment类中的第一个项目加按钮,则value和image需要设置水平listview的第一个项。请在此处建议me.my水平列表视图适配器代码。提前谢谢
public class HorizontalAdapter extends BaseAdapter {
private Context context;
int value = 0;
int a[];
public HorizontalAdapter(Context c, int value) {
context = c;
this.value = value;
}
@Override
public int getCount() {
return 10;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
// convertView = new View(context);
convertView = inflater.inflate(R.layout.horizantal_image, null);
}
TextView textView = (TextView) convertView.findViewById(R.id.title);
ImageView imageView = (ImageView) convertView.findViewById(R.id.image);
textView.setText(String.valueOf(value));
// imageView.setImageResource(image);
System.out.println(value);
System.out.println(position);
System.out.println(convertView);
System.out.println(parent);
// textView.setText(dataObjects[position]);
// imageView.setImageResource(imageid[position]);
return convertView;
}
}
您必须根据您的要求传递一些对象数组或ArrayList,并更改数组中特定项的值,然后将其传递给适配器。你可以创建一个模型类,在其中你可以定义像这样的文本和图像
public class ListModel{
private String imageUrl;
private String title;
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
在BaseAdapter中,您必须使用ListModel的ArrayList,如下所示:
ArrayList<ListModel> listData = new ArrayList<ListModel>();
你必须从一些地方设置listData的内容,比如这个
ListModel listModelData = new ListModel();
// Add Content for specific object
listModelData.setTitle("your title");
listModelData.setImageUrl("your image url");
// Add this object in listview
listData.add(listModelData);
之后,你必须在你的BaseAdapter中传递这个列表,如下所示:
public class HorizontalAdapter extends BaseAdapter {
private Context context;
private int value = 0;
private ArrayList<ListModel> listData;
public HorizontalAdapter(Context c, int value, ArrayList<ListModel> listData) {
context = c;
this.value = value;
this.listData= listData;
}
@Override
public int getCount() {
return listData.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
// convertView = new View(context);
convertView = inflater.inflate(R.layout.horizantal_image, null);
}
TextView textView = (TextView) convertView.findViewById(R.id.title);
ImageView imageView = (ImageView) convertView.findViewById(R.id.image);
textView.setText(String.valueOf(listData.get(position).getImageUrl()));
// imageView.setImageResource(image);
System.out.println(String.valueOf(listData.get(position).getTitle()));
System.out.println(position);
System.out.println(convertView);
System.out.println(parent);
if (listData.get(position).getImageUrl()!=null){
imageView.setImageResource(listData.get(position).getImageUrl());
}
if (listData.get(position).getTitle()!=null){
textView.setText(listData.get(position).getTitle());
}
return convertView;
}
}
要更新ArrayList的具体位置,您必须这样做:
listData.get(0).setImageUrl("Updated Image url");
listData.get(0).setTitle("Updated Title ");
要在列表视图中设置适配器,您必须在活动中执行以下操作:
HorizontalAdapter mAdapter = new HorizontalAdapter (mCtx, value,listData );
mListViews.setAdapter(mAdapter);
要更新Listview,您必须在更新ArrayList的内容后调用notifyDataSetChanged,如下所示:
if (mAdapter !=null){
mAdapter .notifyDataSetChanged();
}