Android 如何在片段中显示节点子节点内的数据?
我的编码显示片段中的所有数据:-Android 如何在片段中显示节点子节点内的数据?,android,firebase,android-studio,firebase-realtime-database,fragment,Android,Firebase,Android Studio,Firebase Realtime Database,Fragment,我的编码显示片段中的所有数据:- DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Advertisement").child("tuitionPackages").child("0"); ref.addValueEventListener(new ValueEventListener() { @Override public void onD
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Advertisement").child("tuitionPackages").child("0");
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists() && dataSnapshot.getChildrenCount() > 0) {
Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();
String academicLevel,packageStatus,price,subjects;
if (map.get("packageStatus") != null) {
packageStatus = map.get("packageStatus").toString();
mPackageType.setText(packageStatus);
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
databasereferef=FirebaseDatabase.getInstance().getReference().child(“广告”).child(“学费包”).child(“0”);
ref.addValueEventListener(新的ValueEventListener(){
@凌驾
公共void onDataChange(DataSnapshot DataSnapshot){
if(dataSnapshot.exists()&&dataSnapshot.getChildrenCount()>0){
Map Map=(Map)dataSnapshot.getValue();
字符串级别、包装、价格、主题;
if(map.get(“packageStatus”)!=null){
packageStatus=map.get(“packageStatus”).toString();
mPackageType.setText(packageStatus);
}
}
}
@凌驾
已取消的公共void(DatabaseError DatabaseError){
}
});
我的数据库:-
显示学费包的我的输出:-
试试这个
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Add your root element").child("tuitionPackages").child("0");
String academicLevel,packageStatus,price,subjects;
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists() && dataSnapshot.getChildrenCount() > 0) {
Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();
if (map.get("academicLevel") != null) {
academicLevel = map.get("academicLevel").toString();
textView.setText(academicLevel);
}
if (map.get("packageStatus") != null) {
packageStatus = map.get("packageStatus").toString();
textView1.setText(packageStatus);
}
if (map.get("price") != null) {
price = map.get("price").toString();
textView2.setText(price);
}
if (map.get("subjects") != null) {
subjects = map.get("subjects").toString();
textView3.setText(subjects);
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
databasereferef=FirebaseDatabase.getInstance().getReference().child(“添加根元素”).child(“tutionPackages”).child(“0”);
字符串级别、包装、价格、主题;
ref.addValueEventListener(新的ValueEventListener(){
@凌驾
公共void onDataChange(DataSnapshot DataSnapshot){
if(dataSnapshot.exists()&&dataSnapshot.getChildrenCount()>0){
Map Map=(Map)dataSnapshot.getValue();
if(map.get(“academicLevel”)!=null){
academicLevel=map.get(“academicLevel”).toString();
textView.setText(学术级);
}
if(map.get(“packageStatus”)!=null){
packageStatus=map.get(“packageStatus”).toString();
textView1.setText(packageStatus);
}
if(map.get(“price”)!=null){
price=map.get(“price”).toString();
textView2.setText(价格);
}
if(map.get(“主题”)!=null){
subjects=map.get(“subjects”).toString();
textView3.setText(主题);
}
}
}
@凌驾
已取消的公共void(DatabaseError DatabaseError){
}
});
希望能帮上大忙。试试这个
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Add your root element").child("tuitionPackages").child("0");
String academicLevel,packageStatus,price,subjects;
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists() && dataSnapshot.getChildrenCount() > 0) {
Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();
if (map.get("academicLevel") != null) {
academicLevel = map.get("academicLevel").toString();
textView.setText(academicLevel);
}
if (map.get("packageStatus") != null) {
packageStatus = map.get("packageStatus").toString();
textView1.setText(packageStatus);
}
if (map.get("price") != null) {
price = map.get("price").toString();
textView2.setText(price);
}
if (map.get("subjects") != null) {
subjects = map.get("subjects").toString();
textView3.setText(subjects);
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
databasereferef=FirebaseDatabase.getInstance().getReference().child(“添加根元素”).child(“tutionPackages”).child(“0”);
字符串级别、包装、价格、主题;
ref.addValueEventListener(新的ValueEventListener(){
@凌驾
公共void onDataChange(DataSnapshot DataSnapshot){
if(dataSnapshot.exists()&&dataSnapshot.getChildrenCount()>0){
Map Map=(Map)dataSnapshot.getValue();
if(map.get(“academicLevel”)!=null){
academicLevel=map.get(“academicLevel”).toString();
textView.setText(学术级);
}
if(map.get(“packageStatus”)!=null){
packageStatus=map.get(“packageStatus”).toString();
textView1.setText(packageStatus);
}
if(map.get(“price”)!=null){
price=map.get(“price”).toString();
textView2.setText(价格);
}
if(map.get(“主题”)!=null){
subjects=map.get(“subjects”).toString();
textView3.setText(主题);
}
}
}
@凌驾
已取消的公共void(DatabaseError DatabaseError){
}
});
希望对您有帮助。您可以尝试使用此代码从firebase数据库获取数据,然后您可以使用该数据以片段形式完成字段
databasereferef=FirebaseDatabase.getInstance().getReference().child(“广告”).child(ID1).child(ID2).child(“TutionPackages”);
ref.addListenerForSingleValueEvent(新的ValueEventListener(){
@凌驾
public void onDataChange(@NonNull DataSnapshot DataSnapshot){
String acadLvl=dataSnapshot.child(“学术级别”).getValue(String.class);
String packStatus=dataSnapshot.child(“packageStatus”).getValue(String.class);
int price=dataSnapshot.child(“price”).getValue(Integer.class);
String sub=dataSnapshot.child(“subjects”).getValue(String.class);
}
}
@凌驾
已取消的公共void(@NonNull DatabaseError DatabaseError){
}
});
在这段代码中,
ID1
和ID2
是我可以在节点广告下的数据库图像中看到的字符串
您可以尝试使用这段代码从firebase数据库中获取数据,然后您可以使用该数据完成片段中的字段
databasereferef=FirebaseDatabase.getInstance().getReference().child(“广告”).child(ID1).child(ID2).child(“TutionPackages”);
ref.addListenerForSingleValueEvent(新的ValueEventListener(){
@凌驾
public void onDataChange(@NonNull DataSnapshot DataSnapshot){
字符串acadLvl=dataSnapshot.child(“学术级别”).getV