I want to pass data from one activity to another, first I download it from Firebase Realtime Database and then pass it to another activity and how to use it in it.
my data like this.(image from the inte.net)
cam_firebase.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NotNull DataSnapshot dataSnapshot, String s) {
// long count = dataSnapshot.getChildrenCount();
double longt = dataSnapshot.child("longt").getValue(Double.class);
double lat = dataSnapshot.child("lat").getValue(Double.class);
String type = dataSnapshot.child("type").getValue(String.class);
List<Model> list = new ArrayList<>();
list.add(new Model());
list.get(0).setLat(lat);
list.get(0).setLongt(longt);
cameras_info.onCallback();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(@NonNull @NotNull DatabaseError error) {
}
});
Assuming that pXGb...lGE2
is the UID of the logged-in user, to be able to read the data that corresponds to your schema, then please use the following lines of code:
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference db = FirebaseDatabase.getInstance().getReference();
DatabaseReference uidRef = db.child("ProgressReportss").child(uid);
uidRef.get().addOnCompleteListener(new OnCompleteListener<DataSnapshot>() {
@Override
public void onComplete(@NonNull Task<DataSnapshot> task) {
if (task.isSuccessful()) {
DataSnapshot snapshot = task.getResult();
for (DataSnapshot ds : snapshot.getChildren()) {
String content = ds.child("content").getValue(String.class);
String timestamp = ds.child("timestamp").getValue(String.class);
String title = ds.child("title").getValue(String.class);
Log.d("TAG", content + "/" + timestamp + "/" + title);
}
} else {
Log.d("TAG", task.getException().getMessage()); //Never ignore potential errors!
}
}
});
The result in the logcat will be:
Test 2/30-11-2018/Test 2
Test 3/30-11-2018/Test 3
Test 4/30-11-2018/Test 4
That's how you read it. If you need to send the data to another activity, inside the onComplete()
use the logic in the following answer:
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