syahmi ami :
I'm still learning programming. I have problems with showing my data from firebase into a textview. My output is not showing the value from the database. This is my database from realtime db realtime
This is my java code:
public class MainActivity extends AppCompatActivity {
TextView status,water,steam,inlet,outlet;
String istatus,iwater,isteam,iinlet,ioutlet;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// address the text
status = findViewById(R.id.a);
water = findViewById(R.id.b);
steam = findViewById(R.id.c);
inlet = findViewById(R.id.d);
outlet = findViewById(R.id.e);
final DatabaseReference ref =FirebaseDatabase.getInstance().getReference().child("ESP32_SADS");
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
status.setText(istatus);
water.setText(iwater);
steam.setText(isteam);
inlet.setText(iinlet);
outlet.setText(ioutlet);
istatus = dataSnapshot.child("Status").getValue().toString();
iwater = dataSnapshot.child("Water").getValue().toString();
isteam = dataSnapshot.child("Steam").getValue().toString();
iinlet = dataSnapshot.child("Inlet").getValue().toString();
ioutlet = dataSnapshot.child("Outlet").getValue().toString();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
My output looks like this:
yousef :
just do it get value from db and then set it in your textView
public class MainActivity extends AppCompatActivity {
TextView status,water,steam,inlet,outlet;
String istatus,iwater,isteam,iinlet,ioutlet;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// address the text
status = findViewById(R.id.a);
water = findViewById(R.id.b);
steam = findViewById(R.id.c);
inlet = findViewById(R.id.d);
outlet = findViewById(R.id.e);
final DatabaseReference ref
=FirebaseDatabase.getInstance().getReference().child("ESP32_SADS");
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
// your variables become have value then put it to your text
istatus = dataSnapshot.child("Status").getValue().toString();
iwater = dataSnapshot.child("Water").getValue().toString();
isteam = dataSnapshot.child("Steam").getValue().toString();
iinlet = dataSnapshot.child("Inlet").getValue().toString();
ioutlet = dataSnapshot.child("Outlet").getValue().toString();
// set values in textViews
status.setText(istatus);
water.setText(iwater);
steam.setText(isteam);
inlet.setText(iinlet);
outlet.setText(ioutlet);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
wrong part in your code , you write first before read
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