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Jetpack compose MutableList LazyColumn
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| package com.example.composelist | |
| import androidx.compose.foundation.BorderStroke | |
| import androidx.compose.foundation.background | |
| import androidx.compose.foundation.clickable | |
| import androidx.compose.foundation.layout.* | |
| import androidx.compose.foundation.shape.RoundedCornerShape | |
| import androidx.compose.material.Card | |
| import androidx.compose.material.Text | |
| import androidx.compose.runtime.Composable | |
| import androidx.compose.ui.Alignment | |
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.graphics.Color | |
| import androidx.compose.ui.text.style.TextAlign | |
| import androidx.compose.ui.tooling.preview.Preview | |
| import androidx.compose.ui.unit.dp | |
| @Composable | |
| fun LogItem(country: String) { | |
| Card( | |
| border = BorderStroke(4.dp, Color.Red), | |
| shape = RoundedCornerShape(20.dp), elevation = 10.dp, | |
| ) { | |
| val padding = 16.dp | |
| Column( | |
| Modifier | |
| .padding(padding) | |
| .fillMaxWidth() | |
| ) { | |
| Row( | |
| Modifier.padding(padding), | |
| verticalAlignment = Alignment.CenterVertically, | |
| horizontalArrangement = Arrangement.Center | |
| ) { | |
| Text( | |
| text = "$country", textAlign = TextAlign.Center, | |
| modifier = Modifier.fillMaxWidth() | |
| ) | |
| } | |
| Spacer(Modifier.size(padding)) | |
| Row() { | |
| Column( | |
| Modifier | |
| .weight(1f) | |
| .background(Color.Blue) | |
| ) { | |
| Text( | |
| modifier = Modifier | |
| .fillMaxWidth() | |
| .background(Color.Red), | |
| text = "Weight = 1", | |
| color = Color.White, | |
| textAlign = TextAlign.Center | |
| ) | |
| Text(text = "azer", color = Color.White) | |
| Text(text = "tyui", color = Color.White) | |
| Text(text = "qsdfgh", color = Color.White) | |
| Text(text = "xcvb", color = Color.White) | |
| } | |
| Column( | |
| Modifier | |
| .weight(1f) | |
| .background(Color.DarkGray) | |
| ) { | |
| Text(text = "Weight = 1") | |
| Text(text = "text 1") | |
| Text(text = "tex2 \n toto \n\n\n\n\n azerty") | |
| } | |
| } | |
| } | |
| } | |
| } | |
| @Preview | |
| @Composable | |
| fun MyPreview() { | |
| LogItem("America") | |
| } |
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| package com.example.composelist | |
| import android.os.Bundle | |
| import androidx.activity.ComponentActivity | |
| import androidx.activity.compose.setContent | |
| 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.getValue | |
| import androidx.compose.runtime.setValue | |
| import androidx.compose.runtime.saveable.rememberSaveable | |
| import androidx.compose.ui.graphics.Color | |
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.text.TextStyle | |
| import androidx.compose.ui.tooling.preview.Preview | |
| import androidx.compose.ui.unit.dp | |
| import androidx.compose.ui.unit.sp | |
| import com.example.composelist.ui.theme.ComposeListTheme | |
| class MainActivity : ComponentActivity() { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContent { | |
| ComposeListTheme { | |
| // A surface container using the 'background' color from the theme | |
| Surface( | |
| modifier = Modifier.fillMaxSize(), | |
| color = MaterialTheme.colors.background | |
| ) { | |
| Greeting("Android") | |
| } | |
| } | |
| } | |
| } | |
| } | |
| @Composable | |
| fun Greeting(name: String) { | |
| Column { | |
| Text(text = "Hello $name!") | |
| HelloScreen() | |
| var clickCount = rememberSaveable { mutableStateOf(0) } | |
| Column { | |
| Button(onClick = { clickCount.value++ }) { | |
| Text(text = "" + clickCount.value + " times clicked") | |
| } | |
| } | |
| DynamicListScreen() | |
| } | |
| } | |
| @Preview(showBackground = true) | |
| @Composable | |
| fun DefaultPreview() { | |
| ComposeListTheme { | |
| Greeting("Android") | |
| HelloScreen() | |
| } | |
| } | |
| @Composable | |
| fun HelloScreen() { | |
| var name by rememberSaveable { mutableStateOf("") } | |
| HelloContent(name = name, onNameChange = { name = it }) | |
| } | |
| @Composable | |
| fun HelloContent(name: String, onNameChange: (String) -> Unit) { | |
| Column(modifier = Modifier.padding(16.dp)) { | |
| Text( | |
| text = "Hello, $name", | |
| modifier = Modifier.padding(bottom = 8.dp), | |
| style = MaterialTheme.typography.h5 | |
| ) | |
| OutlinedTextField( | |
| value = name, | |
| onValueChange = onNameChange, | |
| label = { Text("Name") } | |
| ) | |
| } | |
| } | |
| private val listModifier = Modifier | |
| .fillMaxSize() | |
| .background(Color.Gray) | |
| .padding(10.dp) | |
| var mainList = mutableStateListOf("India", "Pakistan", "China", "United States") | |
| fun addItem() { | |
| mainList.add("France") | |
| } | |
| @Composable | |
| fun DynamicListScreen() { | |
| Text(text = "lazyColumn") | |
| val countryList = remember { mainList } | |
| Button(onClick = { | |
| // countryList.add("France") | |
| addItem() | |
| }) { | |
| Text(text = "new line") | |
| } | |
| LazyColumn(modifier = listModifier) { | |
| items(countryList) { country -> | |
| LogItem(country = country) | |
| } | |
| } | |
| } |
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