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Привет, Я пытаюсь получить данные из своей базы данных и показать их на ExpandableListView. Приложение продолжает сбой, когда я начал использовать JSON, но до этого он работал нормально.Расширяемый просмотр списка с JSON
мой адаптер класса
public class ExpandableListAdapterA extends BaseExpandableListAdapter
{
private Activity context;
private Map<String, List<String>> laptopCollections;
private List<String> laptops;
public ExpandableListAdapterA(Activity context, List<String> laptops,
Map<String, List<String>> laptopCollections) {
this.context = context;
this.laptopCollections = laptopCollections;
this.laptops = laptops;
}
public Object getChild(int groupPosition, int childPosition) {
return laptopCollections.get(laptops.get(groupPosition)).get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String laptop = (String) getChild(groupPosition, childPosition);
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.child_view, null);
}
TextView item = (TextView) convertView.findViewById(R.id.laptop);
ImageView delete = (ImageView) convertView.findViewById(R.id.delete);
delete.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage("Do you want to remove?");
builder.setCancelable(false);
builder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
List<String> child =
laptopCollections.get(laptops.get(groupPosition));
child.remove(childPosition);
notifyDataSetChanged();
}
});
builder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
});
item.setText(laptop);
return convertView;
}
public int getChildrenCount(int groupPosition) {
return laptopCollections.get(laptops.get(groupPosition)).size();
}
public Object getGroup(int groupPosition) {
return laptops.get(groupPosition);
}
public int getGroupCount() {
return laptops.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String laptopName = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.parent_view,
null);
}
TextView item = (TextView) convertView.findViewById(R.id.head);
item.setTypeface(null, Typeface.BOLD);
item.setText(laptopName);
return convertView;
}
public boolean hasStableIds() {
return true;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
мой другой класс
public class Product extends Activity {
List<String> groupList;
List<String> childList;
Map<String, List<String>> laptopCollection;
ExpandableListView expListView;
private static String url = "http://10.0.2.2/Monoprix/DB_Connect.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.products);
new createGroupList().execute();
expListView = (ExpandableListView) findViewById(R.id.products);
final ExpandableListAdapter expListAdapter = new ExpandableListAdapterA(this, groupList, laptopCollection);
expListView.setAdapter(expListAdapter);
//setGroupIndicatorToRight();
expListView.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
final String selected = (String) expListAdapter.getChild(
groupPosition, childPosition);
Toast.makeText(getBaseContext(), selected, Toast.LENGTH_LONG)
.show();
return true;
}
});
}
class createGroupList extends AsyncTask<String,String,String> {
protected String doInBackground(String... args) {
groupList = new ArrayList<String>();
String[] hpModels = { "HP Pavilion G6-2014TX", "ProBook HP 4540",
"HP Envy 4-1025TX" };
//String[] lenovoModels = { "IdeaPad Z Series", "Essential G Series","ThinkPad X Series", "Ideapad Z Series" };
String[] dellModels = { "Inspiron", "Vostro", "XPS" };
try{
JSONParser jsonParser = new JSONParser();
JSONObject json = jsonParser.getJSONFromUrl(url);
Log.d("Create Response", json.toString());
JSONArray title = json.getJSONArray("product");
for (int i=0;i<title.length();i++)
{
JSONObject c = title.getJSONObject(i);
String categ = c.getString("product_category");
groupList.add(categ);
}
childList = new ArrayList<String>();
laptopCollection = new LinkedHashMap<String, List<String>>();
for (String laptop : groupList) {
if (laptop.equals("HP")) {
for (String model : hpModels)
childList.add(model);
} else if (laptop.equals("Dell"))
for (String model : dellModels)
childList.add(model);
laptopCollection.put(laptop, childList);
}
}catch (JSONException e)
{
e.printStackTrace();
}
return null;
}
}
public int getDipsFromPixel(float pixels) {
// Get the screen's density scale
final float scale = getResources().getDisplayMetrics().density;
// Convert the dps to pixels, based on density scale
return (int) (pixels * scale + 0.5f);
}
}
XML файлы XML страницы, которые содержат expandablelist products.xml
<ExpandableListView
android:id="@+id/products"
android:layout_width="match_parent"
android:layout_height="fill_parent" >
</ExpandableListView>
parent_view.xml
<TextView
android:id="@+id/head"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="25dp"/>
child_view.xml
<TextView
android:id="@+id/laptop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:paddingLeft="25dp" />
<ImageView
android:id="@+id/delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:contentDescription="@string/app_name"
android:src="@drawable/ic_delete" />
Мое приложение продолжает сбой на этой странице, и я не могу понять, почему. – user2998687
Просьба также отправить файл xml. Итак, мы можем попытаться в конце и посмотреть, можем ли мы сможем помочь. – Prem
Добавлено. Благодарю . – user2998687