我想在点击项目后，孩子打开了我的新活动，其名称与项目名称相同。那是项目的“测试”，如果我点击它打开test.java类。我发现了一个执行此操作的代码，但我不知道如何将其添加到我的类中。谢谢你的帮助。
public class MyListAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<Alphabet> alphabetList;
private ArrayList<Alphabet> originalList;
public MyListAdapter(Context context, ArrayList<Alphabet> alphabetList){
this.context = context;
this.alphabetList = new ArrayList<Alphabet>();
this.alphabetList.addAll(alphabetList);
this.originalList = new ArrayList<Alphabet>();
this.originalList.addAll(alphabetList);
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return alphabetList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
ArrayList<Waste> wasteList = alphabetList.get(groupPosition).getWasteList();
return wasteList.size();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return alphabetList.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
ArrayList<Waste> wasteList = alphabetList.get(groupPosition).getWasteList();
return wasteList.get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Alphabet alphabet = (Alphabet) getGroup(groupPosition);
if(convertView == null)
{
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.group_row, null);
}
TextView heading = (TextView) convertView.findViewById(R.id.heading);
heading.setText(alphabet.getName().trim());
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Waste waste = (Waste) getChild(groupPosition, childPosition);
if(convertView == null){
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.child_row, null);
}
TextView name = (TextView) convertView.findViewById(R.id.name);
name.setText(waste.getName().trim());
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
public void filterData(String query)
{
query = query.toLowerCase();
Log.v("MyListAdapter", String.valueOf(alphabetList.size()));
alphabetList.clear();
if(query.isEmpty())
{
alphabetList.addAll(originalList);
} else {
for(Alphabet alphabet: originalList)
{
ArrayList<Waste> wasteList = alphabet.getWasteList();
ArrayList<Waste> newList = new ArrayList<Waste>();
for(Waste waste: wasteList)
{
if(waste.getName().toLowerCase().contains(query)){
newList.add(waste);
}
}
if(newList.size() > 0)
{
Alphabet nAlphabet = new Alphabet(alphabet.getName(), newList);
alphabetList.add(nAlphabet);
}
}
}
Log.v("MyListAdapter", String.valueOf(alphabetList.size()));
notifyDataSetChanged();
}
}
SegregateWasteActivity.java
public class SegregateWasteActivity extends Activity implements SearchView.OnQueryTextListener, SearchView.OnCloseListener {
private SearchView search;
private MyListAdapter listAdapter;
private ExpandableListView myList;
private ArrayList<Alphabet> alphabetList = new ArrayList<Alphabet>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.segregate_waste_activity);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
search = (SearchView) findViewById(R.id.search);
search.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
search.setIconifiedByDefault(false);
search.setOnQueryTextListener(this);
search.setOnCloseListener(this);
displayList();
expandAll();
}
@Override
public boolean onClose() {
// TODO Auto-generated method stub
listAdapter.filterData("");
expandAll();
return false;
}
@Override
public boolean onQueryTextSubmit(String query) {
// TODO Auto-generated method stub
listAdapter.filterData(query);
expandAll();
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
// TODO Auto-generated method stub
listAdapter.filterData(newText);
expandAll();
return false;
}
private void expandAll()
{
int count = listAdapter.getGroupCount();
for(int i = 0; i < count; i++)
{
myList.expandGroup(i);
}
}
private void displayList()
{
loadSomeData();
myList = (ExpandableListView) findViewById(R.id.expandableList);
listAdapter = new MyListAdapter(SegregateWasteActivity.this, alphabetList);
myList.setAdapter(listAdapter);
}
private void loadSomeData()
{
ArrayList<Waste> wasteList = new ArrayList<Waste>();
Waste waste = new Waste("Aerozol");
wasteList.add(waste);
waste = new Waste("Aaaa");
wasteList.add(waste);
Alphabet alphabet = new Alphabet("A", wasteList);
alphabetList.add(alphabet);
wasteList = new ArrayList<Waste>();
waste = new Waste("Butelka");
wasteList.add(waste);
alphabet = new Alphabet("B", wasteList);
alphabetList.add(alphabet);
}
}
我希望这个片段抛出：
@Override
protected void onListItemClick(ListView lv, View v, int position, long id){
super.onListItemClick(lv, v, position, id);
String openClass = classNames[position];
try{
Class selected = Class.forName("com.odpad.odpadygdansk.waste." + openClass);
Intent selectedIntent = new Intent(this, selected);
startActivity(selectedIntent);
}catch(ClassNotFoundException e){
e.printStackTrace();
}
}
所以我可以点击列表中的某个项目，转到与该类名同名的新活动。
答案 0 :(得分：3)
我相信你想要这样的东西：
expListView.setOnChildClickListener(new ExpandableListView
.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView elv, View view, int i,
int i2, long l) {
TextView tv = view.findViewById(R.id.name);
String name = (String) tv.getText();
try {
// Change package.name to your package
Class cls = Class.forName("package.name." + name);
Intent intent = new Intent(MainActivity.this, cls);
startActivity(intent);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return false;
}
});
代码几乎是不言自明的。
您可以使用点击回调中收到的位置参数i来获取特定名称而不是findViewById()。那会更有效率。