{ "rules": { ".read": true, ".write": false } }
ROOT - data - value: 99
private class MyValueEventListener implements ValueEventListener { @Override public void onDataChange(DataSnapshot dataSnapshot) { Log.i("********** change", dataSnapshot.getKey() + ": " + dataSnapshot.getValue()); } @Override public void onCancelled(DatabaseError databaseError) { // If we're not expecting an error, report it to your Firebase console FirebaseCrash.report(databaseError.toException()); } }
HashMap map = new HashMap<>(); map.put("value", 100); dataRef.setValue(map);
I/********** change: DataSnapshot { key = data, value = {value=99} } I/********** change: DataSnapshot { key = data, value = {value=100} } W/RepoOperation: setValue at /data failed: DatabaseError: Permission denied I/********** change: DataSnapshot { key = data, value = {value=99} }
private class MyChildEventListener implements ChildEventListener { @Override public void onChildAdded(DataSnapshot dataSnapshot, String s) { Log.i("**********", "childAdded " + dataSnapshot.toString()); } @Override public void onChildChanged(DataSnapshot dataSnapshot, String s) { Log.i("**********", "childChanged " + dataSnapshot.toString()); } @Override public void onChildRemoved(DataSnapshot dataSnapshot) { Log.i("**********", "childRemoved " + dataSnapshot.toString()); } @Override public void onChildMoved(DataSnapshot dataSnapshot, String s) { Log.i("**********", "childMoved " + dataSnapshot.toString()); } @Override public void onCancelled(DatabaseError databaseError) { FirebaseCrash.report(databaseError.toException()); } } DatabaseReference messagesRef = FirebaseDatabase.getInstance().getReference("messages"); messagesRef.addChildEventListener(new MyChildEventListener()); HashMap map = new HashMap<>(); map.put("key", "value"); DatabaseReference newMesssageRef = newMessageRef.push(); newMessageRef.setValue(map);
I/**********: childAdded DataSnapshot { key = -KTfacNOAJt2fCUVtwtj, value = {key=value} } W/RepoOperation: setValue at /messages/-KTfacNOAJt2fCUVtwtj failed: DatabaseError: Permission denied I/**********: childRemoved DataSnapshot { key = -KTfacNOAJt2fCUVtwtj, value = {key=value} }
Task task = messageRef.setValue(map); task.addOnCompleteListener(MainActivity.this, new OnCompleteListener() { @Override public void onComplete(@NonNull Task task) { Log.i("**********", "setValue complete"); if (!task.isSuccessful()) { Log.i("**********", "BUT IT FAILED", task.getException()); FirebaseCrash.log("Error writing to " + ref.toString()); FirebaseCrash.report(task.getException()); } } });
