我在列表视图中使用惰性列表适配器。我试图通过复选框选择获取图像URL和列表中的文本，但两者总是不规则地进行，但列表的位置正确。在我按第一个复选框的同时，它选择所有复选框，当我选择第二个框时，所有偶数复选框都被选中，下面是我的代码。任何人都可以指导数据未正确获取的原因。
class AllLiteratures extends AsyncTask<String, Void, String> {
private ProgressDialog dialog = new ProgressDialog(LiteratureList.this);
@Override
public void onPreExecute() {
if(litList == null) {
// setup your dialog here
dialog.setMessage("Loading...");
dialog.setCancelable(false);
dialog.show();
}
}
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
String productConnect = GetStates();
//set_orienation = getOrient.getOrientation();
return productConnect;
}
private String GetStates() {
// TODO Auto-generated method stub
// Hashmap for ListView
// Creating JSON Parser instance
if(litList == null) { System.out.println("back");
JSONParser jParser = new JSONParser(LiteratureList.this);
try {
json_literature = jParser.getJsonFromUrl("http://tsubaki.usawebdept.com/?type=listOfLiterature");
if(json_literature!= null) {
literature_list = json_literature.toString();
}
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
return literature_list;
}
@SuppressLint("ShowToast")
public void onPostExecute(String result) {
System.out.println("result");
if (result != "" && result != null) {
dialog.dismiss();
litList = new ArrayList<HashMap<String,String>>();
try {
// Getting Array of Contacts
us_literature_list = json_literature.getJSONArray("list");
lit_url = json_literature.getString("siteUrl")+"/";
// looping through All Contacts
System.out.println("Length"+us_literature_list.length());
for(int i = 0; i < us_literature_list.length(); i++){
JSONObject c = us_literature_list.getJSONObject(i);
// Storing each json item in variable
String name = c.getString(CATEGORY_NAME);
String image = c.getString(LARGE_IMAGE.replace(" ", "%20"));
String can_order = c.getString(CAN_ORDER);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(CATEGORY_NAME, name);
map.put(LARGE_IMAGE, lit_url +"/"+ image.replace(" ", "%20"));
map.put(CAN_ORDER,can_order);
// adding HashList to ArrayList
litList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
System.out.println("List" +litList);
lit_home=(ListView) findViewById(R.id.lit_home);
lit_home.setScrollingCacheEnabled(true);
lit_home.setFastScrollEnabled(true);
literature_adapt=new LiteratureAdapter(LiteratureList.this, litList);
lit_home.setAdapter(literature_adapt);
OnItemClickListener listener = new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
}
};
lit_home.setOnItemClickListener(listener);
} else {
if(literature_list != null) {
Toast.makeText(LiteratureList.this, "No Data to Show!", 30).show();
} else {
Toast.makeText(LiteratureList.this, "Server is not responding!", 30).show();
}
}
}
}
//我的懒惰适配器
class LiteratureAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<HashMap<String, String>> data;
LayoutInflater inflater=null;
public ProductImageLoader imageLoader;
String adapter_for;
int loader1;
ViewHolder viewHolder;
public LiteratureAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
//get_orientation = orientation;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ProductImageLoader(activity.getApplicationContext());
}
public int getCount() {
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public class ViewHolder {
TextView title;
CheckBox check_lit;
LinearLayout quantity_selection;
ImageView thumb_image;
HashMap<String, String> song;
String can_order;
EditText quantity_lit;
String quantity;
CheckBox cb;
// RadioButton cb;
}
public View getView(final int position, View convertView, ViewGroup parent) {
View vi=convertView;
viewHolder = new ViewHolder();
if(convertView==null)
vi = inflater.inflate(R.layout.literature_items_port, null);
viewHolder.quantity_lit = (EditText)vi.findViewById(R.id.quantity_lit);
viewHolder.quantity = viewHolder.quantity_lit.getText().toString();
viewHolder.title = (TextView)vi.findViewById(R.id.catalog_name); // title
viewHolder.quantity_selection = (LinearLayout)vi.findViewById(R.id.quantity_selection);
viewHolder.check_lit = (CheckBox)vi.findViewById(R.id.check_lit);
viewHolder.thumb_image=(ImageView)vi.findViewById(R.id.literature_image); // thumb image
//ScrollView cat_scroll_list = (ScrollView)vi.findViewById(R.id.cat_scroll_list);
viewHolder.song = new HashMap<String, String>();
viewHolder.song = data.get(position);
//data.add(viewHolder.song);
viewHolder.title.setText(viewHolder.song.get(LiteratureList.CATEGORY_NAME));
imageLoader.DisplayImage(viewHolder.song.get(LiteratureList.LARGE_IMAGE),loader1, viewHolder.thumb_image);
viewHolder.thumb_image.setScaleType(ScaleType.FIT_XY);
vi.setTag(viewHolder);
viewHolder.check_lit
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
Boolean flag = isChecked;
viewHolder.cb = (CheckBox) buttonView;
if(viewHolder.cb.isChecked()){
//viewHolder.check_lit.setChecked(viewHolder.song.get(position));///move to here
System.out.println("Position"+literature_adapt.getItem(position));
System.out.println("Text"+ viewHolder.title.getText());
//System.out.println("Image"+ viewHolder.thumb_image.toString());
//System.out.println("Order"+ viewHolder.song.get(LiteratureList.CAN_ORDER));
//Toast.makeText(context, "Marked as Favorite Game!", 1).show();
}
}
});
return vi;
}
}
答案 0 :(得分：0)
重新计算和修复的适配器，这应该可以解决问题，您可能需要进行一些更改
class LiteratureAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<HashMap<String, String>> data;
LayoutInflater inflater=null;
public ProductImageLoader imageLoader;
String adapter_for;
int loader1;
int selected = -1; // by default nothing is selected
public LiteratureAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
//get_orientation = orientation;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ProductImageLoader(activity.getApplicationContext());
}
public int getCount() {
if(null == data){
return 0;
}else{
return data.size();
}
}
public HashMap<String, String> getItem(int position) {
if(null == data){
return null;
}else{
return data.get(position);
}
}
public long getItemId(int position) {
return position;
}
public class ViewHolder {
TextView title;
CheckBox check_lit;
LinearLayout quantity_selection;
ImageView thumb_image;
HashMap<String, String> song;
String can_order;
EditText quantity_lit;
String quantity;
CheckBox cb;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if(convertView==null){
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.literature_items_port, null);
viewHolder.quantity_lit = (EditText)convertView.findViewById(R.id.quantity_lit);
viewHolder.title = (TextView)convertView.findViewById(R.id.catalog_name); // title
viewHolder.quantity_selection = (LinearLayout)convertView.findViewById(R.id.quantity_selection);
viewHolder.check_lit = (CheckBox)convertView.findViewById(R.id.check_lit);
viewHolder.thumb_image=(ImageView)convertView.findViewById(R.id.literature_image); // thumb image
//ScrollView cat_scroll_list = (ScrollView)convertView.findViewById(R.id.cat_scroll_list);
viewHolder.song = new HashMap<String, String>();
viewHolder.check_lit.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if(isChecked){
String sPos = (String)buttonView.getTag();
int iPos = Integer.parseInt(pos);
if(selected != iPos){
selected = iPos;
//new Item got selected do your work here
Toast.makeText(a.getApplicationContext(), "User selected: "+ iPos, Toast.LENGTH_LONG).show();
LiteratureAdapter.this.notifyDataSetChanged();
}
}
}
});
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) convertView.getTag();
}
//retain the checked state
if(position == selected){
viewHolder.check_lit.setChecked(true);
}else{
viewHolder.check_lit.setChecked(false); //needs to be reset
}
viewHolder.check_lit.setTag(""+position);
viewHolder.song = getItem(position);
viewHolder.title.setText(viewHolder.song.get(LiteratureList.CATEGORY_NAME));
imageLoader.DisplayImage(viewHolder.song.get(LiteratureList.LARGE_IMAGE),loader1, viewHolder.thumb_image);
viewHolder.thumb_image.setScaleType(ScaleType.FIT_XY);
return convertView;
}
}
我基本上保留了最后一个检查位置，并在getView中检查相同位置以相应地更新复选框。