package
com.example.firebaseproject
import
android.annotation.SuppressLint
import
android.content.Context
import
android.os.Bundle
import
android.util.Log
import
androidx.activity.ComponentActivity
import
androidx.activity.compose.setContent
import
androidx.annotation.Nullable
import
androidx.compose.foundation.background
import
androidx.compose.foundation.layout.*
import
androidx.compose.foundation.lazy.LazyColumn
import
androidx.compose.foundation.lazy.items
import
androidx.compose.material.*
import
androidx.compose.runtime.*
import
androidx.compose.runtime.snapshots.SnapshotStateList
import
androidx.compose.ui.Alignment
import
androidx.compose.ui.Modifier
import
androidx.compose.ui.graphics.Color
import
androidx.compose.ui.platform.LocalContext
import
androidx.compose.ui.text.TextStyle
import
androidx.compose.ui.text.font.FontWeight
import
androidx.compose.ui.text.style.TextAlign
import
androidx.compose.ui.unit.dp
import
androidx.compose.ui.unit.sp
import
com.example.firebaseproject.ui.theme.FirebaseProjectTheme
import
com.example.firebaseproject.ui.theme.greenColor
import
com.google.firebase.database.ChildEventListener
import
com.google.firebase.database.DataSnapshot
import
com.google.firebase.database.DatabaseError
import
com.google.firebase.database.FirebaseDatabase
class
MainActivity : ComponentActivity() {
@SuppressLint
(
"UnrememberedMutableState"
)
override fun onCreate(savedInstanceState: Bundle?) {
super
.onCreate(savedInstanceState)
setContent {
FirebaseProjectTheme {
Surface(
modifier = Modifier.fillMaxSize(), color = MaterialTheme.colors.background
) {
Scaffold(
topBar = {
TopAppBar(backgroundColor = greenColor,
title = {
Text(
text =
"GFG"
,
modifier = Modifier.fillMaxWidth(),
textAlign = TextAlign.Center,
color = Color.White
)
})
}) {
var languageList = mutableStateListOf<String?>()
val firebaseDatabase = FirebaseDatabase.getInstance();
val databaseReference = firebaseDatabase.getReference();
databaseReference.addChildEventListener(object : ChildEventListener {
override fun onChildAdded(
snapshot: DataSnapshot,
@Nullable
previousChildName: String?
) {
languageList.add(snapshot.getValue(String::
class
.java)!!)
}
override fun onChildChanged(
snapshot: DataSnapshot,
@Nullable
previousChildName: String?
) {
}
override fun onChildRemoved(snapshot: DataSnapshot) {
}
override fun onChildMoved(
snapshot: DataSnapshot,
@Nullable
previousChildName: String?
) {
}
override fun onCancelled(error: DatabaseError) {
}
})
firebaseUI(LocalContext.current, languageList)
}
}
}
}
}
}
@Composable
fun firebaseUI(context: Context, languageList: SnapshotStateList<String?>) {
Column(
modifier = Modifier
.fillMaxHeight()
.fillMaxWidth()
.background(Color.White),
verticalArrangement = Arrangement.Top, horizontalAlignment = Alignment.CenterHorizontally
) {
Text(
text =
"Dynamic ListView Example"
,
modifier = Modifier.padding(
10
.dp),
style = TextStyle(
color = Color.Black, fontSize =
20
.sp
), fontWeight = FontWeight.Bold
)
LazyColumn {
items(languageList) { language ->
Text(
""
+ language, modifier = Modifier.padding(
15
.dp))
Divider()
}
}
}
}