State Leasson

app/build.gradle.kts

@@ -59,6 +59,8 @@ dependencies {
     implementation("androidx.compose.ui:ui-graphics")
     implementation("androidx.compose.ui:ui-tooling-preview")
     implementation("androidx.compose.material3:material3")
+    implementation ("androidx.lifecycle:lifecycle-viewmodel-compose:2.6.0")
+    implementation ("androidx.lifecycle:lifecycle-runtime-compose:2.6.0")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")

app/src/main/java/com/discordtime/whatudoing/MainActivity.kt

@@ -1,26 +1,34 @@
 package com.discordtime.whatudoing
 
 import android.os.Bundle
+import android.widget.Toast
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Button
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.lifecycle.viewmodel.compose.viewModel
 import com.discordtime.whatudoing.ui.theme.WhatudoingTheme
 
-
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -29,23 +37,53 @@ class MainActivity : ComponentActivity() {
                 // A surface container using the 'background' color from the theme
                 Surface(
                     modifier = Modifier.fillMaxSize(),
-                    color = MaterialTheme.colorScheme.background
+                    color = Color(0xFF00D7AD)
                 ) {
-                    Greeting("Android")
+                    val viewModel = viewModel<MainViewModel>()
+                    val stateFromViewModel by viewModel.state.collectAsStateWithLifecycle()
+                    var state by rememberSaveable {
+                        mutableStateOf(true)
+                    }
+                    Column(
+                        Modifier.padding(26.dp, 36.dp),
+                        verticalArrangement = Arrangement.Center,
+                        horizontalAlignment = Alignment.CenterHorizontally
+                    ) {
+                        Logo()
+                        Row(
+                            modifier = Modifier
+                                .padding(top = 50.dp)
+                                .fillMaxWidth(),
+                            horizontalArrangement = Arrangement.SpaceBetween
+                        ) {
+                            Text(text = stateFromViewModel.name)
+                            Text(text = stateFromViewModel.age.toString())
+                            Text(text = stateFromViewModel.motherName)
+                        }
+                        Button(
+                            modifier = Modifier.padding(top = 50.dp),
+                            onClick = {
+                                state = !state
+                                viewModel.setState(StateUI("Jovi", 35, "Nathalia"))
+                                Toast.makeText(
+                                    applicationContext, "Will",
+                                    Toast.LENGTH_SHORT
+                                ).show()
+                            }) {
+                            if (state) {
+                                Text(text = "Test")
+                            } else {
+                                Text("outro texto")
+                            }
+
+                        }
+                    }
                 }
             }
         }
     }
 }
 
-@Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Hello $name!",
-        modifier = modifier
-    )
-}
-
 @Preview(showBackground = true)
 @Composable
 fun GreetingPreview() {
@@ -60,7 +98,14 @@ fun GreetingPreview() {
                 horizontalAlignment = Alignment.CenterHorizontally
             ) {
                 Logo()
+                Button(
+                    modifier = Modifier.padding(top = 50.dp),
+                    onClick = {}) {
+                    Text(text = "Test")
+
+                }
             }
+
         }
     }
 }

app/src/main/java/com/discordtime/whatudoing/MainViewModel.kt

@@ -0,0 +1,21 @@
+package com.discordtime.whatudoing
+
+import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+
+class MainViewModel : ViewModel() {
+    private val _state = MutableStateFlow(StateUI())
+    val state = _state.asStateFlow()
+
+    fun setState(newState : StateUI){
+        _state.update {newState}
+    }
+}
+
+data class StateUI(
+    val name: String = "Fulano",
+    val age: Int = 0,
+    val motherName: String = "Fulana"
+)