我想在expandableListView中从firebase检索数据。在标题中，我想要4个值，如表格no，发票号，日期，账单金额。帮我找出解决方案 使用发票号和日期进行搜索，点击项目时展开项目并显示项目信息。
public class MainActivity extends ActionBarActivity {
private static ExpandableListView expandableListView;
private static ExpandableListAdapter adapter;
private DatabaseReference mRef;
private FirebaseDatabase mFirebaseInstance;
BillModel bill;
ArrayList<BillModel> billarry = new ArrayList<BillModel>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
expandableListView = (ExpandableListView) findViewById(R.id.simple_expandable_listview);
mFirebaseInstance = FirebaseDatabase.getInstance();
// Setting group indicator null for custom indicator
expandableListView.setGroupIndicator(null);
setItems();
setListener();
}
void setItems() {
mRef = mFirebaseInstance.getReference();
DatabaseReference queryrecord = mRef.child("bill");
queryrecord.addValueEventListener(new ValueEventListener() {
public void onDataChange(DataSnapshot snapshot) {
billarry.clear();
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
bill = postSnapshot.getValue(BillModel.class);
String bill_date = bill.getBill_date();
String Bill_amount = bill.getBill_amount();
String Bill_tableno = bill.getBill_tableno();
String Incvoice_no = bill.getIncvoice_no();
Log.d("result", "Bill---" + bill_date+","+Bill_amount+","+Bill_tableno+","+Incvoice_no);
billarry.add(bill);
// here you can access to name property like university.name
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
// Array list for header
ArrayList<String> header = new ArrayList<String>();
// Array list for child items
List<String> child1 = new ArrayList<String>();
List<String> child2 = new ArrayList<String>();
List<String> child3 = new ArrayList<String>();
List<String> child4 = new ArrayList<String>();
// Hash map for both header and child
HashMap<ArrayList<BillModel>, List<String>> hashMap = new HashMap<>();
// Adding header and childs to hash map
hashMap.put(billarry, child1);
Log.d("result", "HAsh-Bill---" + hashMap.put(billarry,child1 ));
hashMap.put(billmodel.get(1), child2);
hashMap.put(billmodel.get(2), child3);
hashMap.put(billmodel.get(3), child4);
adapter = new ExpandableListAdapter(MainActivity.this, header, hashMap);
// Setting adpater over expandablelistview
expandableListView.setAdapter(adapter);
}
void setListener() {
// This listener will show toast on group click
expandableListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView listview, View view,
int group_pos, long id) {
Toast.makeText(MainActivity.this,
"You clicked : " + adapter.getGroup(group_pos),
Toast.LENGTH_SHORT).show();
return false;
}
});
expandableListView
.setOnGroupExpandListener(new OnGroupExpandListener() {
// Default position
int previousGroup = -1;
@Override
public void onGroupExpand(int groupPosition) {
if (groupPosition != previousGroup)
// Collapse the expanded group
expandableListView.collapseGroup(previousGroup);
previousGroup = groupPosition;
}
});
// This listener will show toast on child click
expandableListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView listview, View view,
int groupPos, int childPos, long id) {
Toast.makeText(
MainActivity.this,
"You clicked : " + adapter.getChild(groupPos, childPos),
Toast.LENGTH_SHORT).show();
return false;
}
});
}
}