[英]How to retrieve the data from firebase into a ListView?
我看到了這段代碼,但是它在TextView中檢索數據,但是我希望它能在ListView中設置。
我怎樣才能做到這一點?
這是我試過的代碼:
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
//Getting the data from snapshot
Person person = postSnapshot.getValue(Person.class);
//Adding it to a string
String string = "Name: "+person.getName()+"\nAddress: "+person.getAddress()+"\n\n";
//Displaying it on textview
textViewPersons.setText(string);
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
這是我的ListView代碼:
messageList = (ListView) findViewById(R.id.messageList);
messages = new ArrayList<Message>();
mAdapter = new MyArrayAdapter(this, messages);
messageList.setAdapter((ListAdapter) mAdapter);
您可以使用FirebaseUI for Android庫。
只需添加依賴項(0.4.4適用於firebase 9.4.0庫):
dependencies {
// Single target that includes all FirebaseUI libraries
compile 'com.firebaseui:firebase-ui:0.4.4'
}
然后將ListView與適配器連接(在這種情況下是人員列表):
ListView personsView = (ListView) findViewById(R.id.mylist);
DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
mAdapter = new FirebaseListAdapter<Person>(this, Person.class, R.layout.myItemLayout, ref) {
@Override
protected void populateView(View view, Person person, int position) {
//Populate the item
}
};
personsView.setAdapter(mAdapter);
首先,您需要修復對象類型。 您的適配器(和后備ArrayList)具有Message對象,但Firebase為您提供了Person對象。
假設您使適配器獲取Person對象,只需添加到適配器
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
//Getting the data from snapshot
Person person = postSnapshot.getValue(Person.class);
mAdapter.add(person);
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