Los botones de alternancia se utilizan en la mayoría de las aplicaciones. Estos botones se utilizan para realizar múltiples operaciones. Los botones de alternancia se utilizan en muchas aplicaciones de redes sociales como Instagram. En las aplicaciones de redes sociales, podemos ver un ícono de corazón que se usa para dar me gusta a la imagen. También podemos diferenciar esa imagen haciendo clic en el mismo icono. En este artículo, veremos cómo crear un botón de cambio de icono en Android Jetpack Compose
Implementación paso a paso
Paso 1: crea un nuevo proyecto en Android Studio
Para crear un nuevo proyecto en Android Studio, consulte Cómo crear/iniciar un nuevo proyecto en Android Studio . Al elegir la plantilla, seleccione Actividad de composición vacía . Si no encuentra esta plantilla, intente actualizar Android Studio a la última versión. Demostramos la aplicación en Kotlin, así que asegúrese de seleccionar Kotlin como idioma principal al crear un nuevo proyecto.
Paso 2: trabajar con el archivo MainActivity.kt
Vaya al archivo MainActivity.kt y consulte el siguiente código. A continuación se muestra el código del archivo MainActivity.kt. Se agregan comentarios dentro del código para comprender el código con más detalle.
Kotlin
package com.example.newcanaryproject
import android.Manifest.permission.READ_EXTERNAL_STORAGE
import android.annotation.SuppressLint
import android.app.Activity
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.content.pm.PackageManager
import android.content.res.ColorStateList
import android.database.Cursor
import android.os.Bundle
import android.os.Environment
import android.provider.MediaStore
import android.util.Log
import android.widget.TextClock
import android.widget.Toast
import android.widget.ToggleButton
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.animation.animateColor
import androidx.compose.animation.core.*
import androidx.compose.foundation.ExperimentalFoundationApi
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.GridCells
import androidx.compose.foundation.lazy.LazyVerticalGrid
import androidx.compose.material.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Favorite
import androidx.compose.material.icons.filled.FavoriteBorder
import androidx.compose.runtime.*
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.res.colorResource
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.semantics.Role.Companion.Image
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.*
import androidx.compose.ui.viewinterop.AndroidView
import androidx.core.app.ActivityCompat
import androidx.core.app.ActivityCompat.requestPermissions
import androidx.core.content.ContextCompat
import androidx.localbroadcastmanager.content.LocalBroadcastManager
import coil.compose.rememberImagePainter
import com.example.newcanaryproject.MainActivity2
import com.example.newcanaryproject.R
import com.example.newcanaryproject.ui.theme.*
import java.io.File
import java.text.SimpleDateFormat
import java.util.*
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
NewCanaryProjectTheme {
// on below line we are specifying
// background color for our application
Surface(
modifier = Modifier.fillMaxSize(), color = MaterialTheme.colors.background
) {
// on below line we are specifying theme as scaffold.
Scaffold(
// in scaffold we are specifying top bar.
topBar = {
// inside top bar we are specifying background color.
TopAppBar(backgroundColor = greenColor,
// along with that we are specifying
// title for our top bar.
title = {
// in the top bar we are specifying tile as a text
Text(
// on below line we are specifying text
// to display in top app bar.
text = "GFG",
// on below line we are specifying modifier
// to fill max width.
modifier = Modifier.fillMaxWidth(),
// on below line we are
// specifying text alignment.
textAlign = TextAlign.Center,
// on below line we are specifying
// color for our text.
color = Color.White
)
})
}) {
// on below line we are
// calling our function.
displayToggleButton()
}
}
}
}
}
}
// on below line we are creating a function
// to get current date and time.
@SuppressLint("UnusedTransitionTargetStateParameter")
@Composable
fun displayToggleButton() {
// in below line we are setting
// the state of our checkbox.
val checkedState = remember { mutableStateOf(false) }
// on below line we are creating a column on below sides.
Column(
// on below line we are adding padding
// padding for our column and filling the max size.
Modifier
.fillMaxSize()
.fillMaxHeight()
.fillMaxWidth(),
// on below line we are adding
// horizontal alignment for our column
horizontalAlignment = Alignment.CenterHorizontally,
// on below line we are adding
// vertical arrangement for our column
verticalArrangement = Arrangement.Center
) {
Text(
// on below line we are specifying
// text to display.
text = "Toggle Button in Android",
// on below line we are specifying
// modifier to fill max width.
modifier = Modifier
.fillMaxWidth()
.padding(20.dp),
// on below line we are specifying
// text alignment.
textAlign = TextAlign.Center,
// on below line we are specifying
// color for our text.
color = Color.Black,
// on below line we are
// specifying font weight
fontWeight = FontWeight.Bold,
// on below line we
// are updating font size.
fontSize = 25.sp,
)
// on below line we are creating a spacer.
Spacer(modifier = Modifier.height(20.dp))
Text(
// on below line we are specifying text to display.
text = if (checkedState.value) "Like" else "Dis Like",
// on below line we are specifying
// modifier to fill max width.
modifier = Modifier
.fillMaxWidth()
.padding(20.dp),
// on below line we are
// specifying text alignment.
textAlign = TextAlign.Center,
// on below line we are
// specifying color for our text.
color = Color.Black,
// on below line we are
// specifying font weight
fontWeight = FontWeight.Bold,
// on below line we
// are updating font size.
fontSize = 25.sp,
)
// on below line we are creating a spacer.
Spacer(modifier = Modifier.height(20.dp))
// on below line we are creating icon toggle button.
IconToggleButton(
// on below line we are
// specifying default check state
checked = checkedState.value,
// on below line we are adding on check change
onCheckedChange = {
checkedState.value = !checkedState.value
},
// on below line we are adding a padding
modifier = Modifier.padding(10.dp)
) {
// on below line we are creating a
// variable for our transition
val transition = updateTransition(checkedState.value)
// on below line we are creating a variable for
// color of our icon
val tint by transition.animateColor(label = "iconColor") { isChecked ->
// if toggle button is checked we are setting color as red.
// in else condition we are setting color as black
if (isChecked) Color.Green else Color.Black
}
// om below line we are specifying transition
val size by transition.animateDp(
transitionSpec = {
// on below line we are specifying transition
if (false isTransitioningTo true) {
// on below line we are specifying key frames
keyframes {
// on below line we are specifying animation duration
durationMillis = 250
// on below line we are specifying animations.
30.dp at 0 with LinearOutSlowInEasing // for 0-15 ms
35.dp at 15 with FastOutLinearInEasing // for 15-75 ms
40.dp at 75 // ms
35.dp at 150 // ms
}
} else {
spring(stiffness = Spring.StiffnessVeryLow)
}
},
label = "Size"
) { 30.dp }
// on below line we are creating icon for our toggle button.
Icon(
// on below line we are specifying icon for our image vector.
imageVector = if (checkedState.value) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
contentDescription = "Icon",
// on below line we are specifying
// tint for our icon.
tint = tint,
// on below line we are specifying
// size for our icon.
modifier = Modifier.size(size)
)
}
}
}
Ahora ejecute su aplicación para ver el resultado.
Producción:
Publicación traducida automáticamente
Artículo escrito por chaitanyamunje y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA