我想知道我的应用程序数据中可扩展 ListView 中的复选框状态来自服务器。
我的ProductsCategory.java:-
public class ProductsCategory extends AppCompatActivity {
private ListView listView;
private GridView gridView;
ProductsAdapter adapter;
ProductsAdapterGridView adapterGridView;
ArrayList<Products> productsList = new ArrayList<>();
String menu_id;
TextView textView,textViewfilter;
// Filter Class
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader = new ArrayList<>();
HashMap<String, List<String>> listDataChild = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.produts_category);
Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("Shopping Mazza");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
Intent i = getIntent();
menu_id = i.getStringExtra("category");
adapter = new ProductsAdapter(ProductsCategory.this,R.layout.product_page_list_view,productsList);
adapterGridView = new ProductsAdapterGridView(ProductsCategory.this,R.layout.products_page_grid_view,productsList);
expListView = (ExpandableListView) findViewById(R.id.filter_expandable_list_view);
listView = (ListView)findViewById(R.id.list_product);
gridView = (GridView)findViewById(R.id.list_product_grid);
textView = (TextView)findViewById(R.id.change_view);
textViewfilter = (TextView)findViewById(R.id.textView);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(listView.getVisibility()==View.VISIBLE){
listView.setVisibility(View.GONE);
gridView.setVisibility(View.VISIBLE);
}
else {
listView.setVisibility(View.VISIBLE);
gridView.setVisibility(View.GONE);
}
}
});
textViewfilter.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (expListView.getVisibility() == View.VISIBLE) {
listDataHeader.clear();
listDataChild.clear();
listAdapter = new ExpandableListAdapter(ProductsCategory.this, listDataHeader, listDataChild);
expListView.setAdapter(listAdapter);
listAdapter.notifyDataSetChanged();
expListView.setVisibility(View.GONE);
}
else {
expListView.setVisibility(View.VISIBLE);
// preparing list data
// prepareListData();
new PrepareListData().execute("http://opencart.codeniques.com/shopping/?route=feed/web_api/filters&key=test123$");
// Listview Group click listener
expListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// Toast.makeText(getApplicationContext(),
// "Group Clicked " + listDataHeader.get(groupPosition),
// Toast.LENGTH_SHORT).show();
return false;
}
});
// Listview Group expanded listener
expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
/* Intent i = new Intent(ProductsCategory.this,FilterClass.class);
i.putExtra("category_id",menu_id);
startActivity(i);*/
}
}
});
new Product().execute("http://opencart.codeniques.com/shopping/?route=feed/web_api/products&key=test123$");
}
public class PrepareListData extends AsyncTask<String,Void,Void>{
ProgressDialog dialog;
@Override
protected synchronized void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(ProductsCategory.this);
dialog.setCancelable(false);
dialog.show();
}
@Override
protected synchronized Void doInBackground(String... params) {
try {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(params[0]);
List<NameValuePair> nameValuePairs = new ArrayList<>(1);
nameValuePairs.add(new BasicNameValuePair("category",menu_id));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
if(response.getStatusLine().getStatusCode()==200){
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(data);
JSONArray jsonArray = jsonObject.getJSONArray("filters");
// Log.d("jsonarray",jsonArray.length()+"");
Log.d("filter",jsonArray+"");
for(int i=0;i<jsonArray.length();i++){
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
String s = jsonObject1.getString("filter_group_id");
listDataHeader.add(jsonObject1.getString("name"));
JSONArray jsonArray1 = jsonObject1.getJSONArray("filter");
List<String> firstlevel = new ArrayList<>();
for(int j=0;j<jsonArray1.length();j++){
JSONObject jsonObject11 = jsonArray1.optJSONObject(j);
String s1 = jsonObject11.getString("filter_id");
String colorcode = jsonObject11.getString("colorcode");
firstlevel.add(jsonObject11.getString("name"));
}
listDataChild.put(listDataHeader.get(i), firstlevel);
Log.d("listDataHeader", listDataHeader.get(i)+"");
Log.d("value of", firstlevel + "");
Log.d("hash map", listDataChild.size() + "");
// firstlevel.clear();
}
}
}catch (IOException |JSONException e){
Log.e("Error :", e.getMessage());
}
return null;
}
@Override
protected synchronized void onPostExecute(Void aVoid) {
// super.onPostExecute(aVoid);
dialog.dismiss();
listAdapter = new ExpandableListAdapter(ProductsCategory.this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
}
}
我的ExpandableListAdapter:-
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
public ExpandableListAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item_filter, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group_filter, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
我想知道哪个按钮被复选框选中并调用用户定义方法。当我选中复选框和折叠组然后再次展开组时还有一件事，复选框的位置发生了变化。
我给出两个位置的快照:-
当我折叠并再次展开时，复选框位置发生变化。
最佳答案
它实际上类似于带有复选框的 ListView 。您需要在内部记住状态(例如，使用 boolean 数组或集合)并提供状态的 getter。
从您的子布局中获取复选框并添加一个监听器
public class ExpandableListAdapter extends BaseExpandableListAdapter { ... private final Set<Pair<Long, Long>> mCheckedItems = new HashSet<Pair<Long, Long>>(); ... public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { ... final CheckBox cb = (CheckBox) convertView.findViewById(R.id.your_checkbox_id); // add tag to remember groupId/childId final Pair<Long, Long> tag = new Pair<Long, Long>( getGroupId(groupPosition), getChildId(groupPosition, childPosition)); cb.setTag(tag); // set checked if groupId/childId in checked items cb.setChecked(mCheckedItems.contains(tag)); // set OnClickListener to handle checked switches cb.setOnClickListener(new OnClickListener() { public void onClick(View v) { final CheckBox cb = (CheckBox) v; final Pair<Long, Long> tag = (Pair<Long, Long>) v.getTag(); if (cb.isChecked()) { mCheckedItems.add(tag); } else { mCheckedItems.remove(tag); } } }); ... } ... }为您的选中状态添加一个 getter
public class ExpandableListAdapter extends BaseExpandableListAdapter { ... public Set<Pair<Long, Long>> getCheckedItems() { return mCheckedItems; } ... }
稀疏填充的集合包含所有选中的组/子项。您可以调用该方法，例如在你的 Activity 中。
关于您的第二个问题:我假设在折叠/展开组时选中的 subview 不正确，因为一些内部重用的 subview 现在位于不同的位置。
另外不要忘记复选框项目的以下布局属性，以免丢失子项目的点击事件。
android:focusable="false"
android:focusableInTouchMode="false"
关于java - 如何在android中的可扩展 ListView 中获取复选框状态，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33301708/