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[英]How to implement BottomSheet in Material 3 Jetpack Compose Android
[英]How to implement search in Jetpack Compose - Android
var noteListState by remember { mutableStateOf(listOf("Drink water", "Walk")) }
這是我的物品清單。 任何線索將不勝感激
請您再解釋一下,這個問題有點短而且不清楚。
一種方法(我認為您可以這樣做)就是遍歷列表並檢查(您的列表的)元素是否包含該文本。
val filterPattern = text.toString().lowercase(Locale.getDefault()) // text you are looking for
for (item in copyList) { // first make a copy of the list
if (item.name.lowercase(Locale.getDefault()).contains(filterPattern)) {
filteredList.add(item) // if the item contains that text add it to the list
}
}
... // here you then override noteListState
制作完filteredList
列表后,您可以覆蓋noteListState
。 確保事先制作該列表的副本,並在您不想顯示過濾結果時將其重新設置。
獲取帶有列表和搜索視圖的主 UI
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MainScreen()
}
}
對於主()
@Composable
fun MainScreen() {
val textState = remember { mutableStateOf(TextFieldValue("")) }
Column {
SearchView(textState)
ItemList(state = textState)
}
}
對於 Serchview 和列表
@Composable
fun SearchView(state: MutableState<TextFieldValue>) {
TextField(
value = state.value,
onValueChange = { value ->
state.value = value
},
modifier = Modifier.fillMaxWidth(),
textStyle = TextStyle(color = Color.White, fontSize = 18.sp),
leadingIcon = {
Icon(
Icons.Default.Search,
contentDescription = "",
modifier = Modifier
.padding(15.dp)
.size(24.dp)
)
},
trailingIcon = {
if (state.value != TextFieldValue("")) {
IconButton(
onClick = {
state.value =
TextFieldValue("") // Remove text from TextField when you press the 'X' icon
}
) {
Icon(
Icons.Default.Close,
contentDescription = "",
modifier = Modifier
.padding(15.dp)
.size(24.dp)
)
}
}
},
singleLine = true,
shape = RectangleShape, // The TextFiled has rounded corners top left and right by default
colors = TextFieldDefaults.textFieldColors(
textColor = Color.White,
cursorColor = Color.White,
leadingIconColor = Color.White,
trailingIconColor = Color.White,
backgroundColor = MaterialTheme.colors.primary,
focusedIndicatorColor = Color.Transparent,
unfocusedIndicatorColor = Color.Transparent,
disabledIndicatorColor = Color.Transparent
)
)
}
@Composable
fun ItemList(state: MutableState<TextFieldValue>) {
val items by remember { mutableStateOf(listOf("Drink water", "Walk")) }
var filteredItems: List<String>
LazyColumn(modifier = Modifier.fillMaxWidth()) {
val searchedText = state.value.text
filteredItems = if (searchedText.isEmpty()) {
items
} else {
val resultList = ArrayList<String>()
for (item in items) {
if (item.lowercase(Locale.getDefault())
.contains(searchedText.lowercase(Locale.getDefault()))
) {
resultList.add(item)
}
}
resultList
}
items(filteredItems) { filteredItem ->
ItemListItem(
ItemText = filteredItem,
onItemClick = { /*Click event code needs to be implement*/
}
)
}
}
}
@Composable
fun ItemListItem(ItemText: String, onItemClick: (String) -> Unit) {
Row(
modifier = Modifier
.clickable(onClick = { onItemClick(ItemText) })
.background(colorResource(id = R.color.purple_700))
.height(57.dp)
.fillMaxWidth()
.padding(PaddingValues(8.dp, 16.dp))
) {
Text(text = ItemText, fontSize = 18.sp, color = Color.White)
}
}
有關更詳細的答案,您可以參考此鏈接
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