feat:登录以后保存用户名密码,方便下次登录

android/app/src/main/java/com/memory/app/MainActivity.kt

@@ -14,6 +14,7 @@ import coil.Coil
 import coil.ImageLoader
 import coil.disk.DiskCache
 import coil.memory.MemoryCache
+import com.memory.app.data.CredentialsManager
 import com.memory.app.data.ThemeManager
 import com.memory.app.data.ThemeMode
 import com.memory.app.data.model.User
@@ -28,12 +29,14 @@ import okhttp3.OkHttpClient
 class MainActivity : ComponentActivity() {
     private lateinit var authRepository: AuthRepository
     private lateinit var themeManager: ThemeManager
+    private lateinit var credentialsManager: CredentialsManager
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
 
         themeManager = ThemeManager(this)
+        credentialsManager = CredentialsManager(this)
 
         // 配置 Coil 图片加载器
         val imageLoader = ImageLoader.Builder(this)
@@ -103,6 +106,8 @@ class MainActivity : ComponentActivity() {
                                             .onSuccess {
                                                 isLoggedIn = true
                                                 currentUser = it.user
+                                                // 登录成功后保存凭据
+                                                credentialsManager.saveCredentials(username, password)
                                             }
                                             .onFailure {
                                                 error = it.message ?: "登录失败"
@@ -118,6 +123,8 @@ class MainActivity : ComponentActivity() {
                                             .onSuccess {
                                                 isLoggedIn = true
                                                 currentUser = it.user
+                                                // 注册成功后保存凭据
+                                                credentialsManager.saveCredentials(username, password)
                                             }
                                             .onFailure {
                                                 error = it.message ?: "注册失败"
@@ -126,7 +133,9 @@ class MainActivity : ComponentActivity() {
                                     }
                                 },
                                 isLoading = isLoading,
-                                error = error
+                                error = error,
+                                savedUsername = credentialsManager.getSavedUsername(),
+                                savedPassword = credentialsManager.getSavedPassword()
                             )
                         }
                         true -> {

android/app/src/main/java/com/memory/app/data/CredentialsManager.kt

@@ -0,0 +1,65 @@
+package com.memory.app.data
+
+import android.content.Context
+import android.util.Base64
+import javax.crypto.Cipher
+import javax.crypto.spec.SecretKeySpec
+
+class CredentialsManager(context: Context) {
+    private val prefs = context.getSharedPreferences("credentials_prefs", Context.MODE_PRIVATE)
+    
+    private val usernameKey = "saved_username"
+    private val passwordKey = "saved_password"
+    
+    // 简单的加密密钥
+    private val encryptionKey = "MemoryApp2024Key"
+    
+    // 简单加密
+    private fun encrypt(text: String): String {
+        val key = SecretKeySpec(encryptionKey.toByteArray().copyOf(16), "AES")
+        val cipher = Cipher.getInstance("AES/ECB/PKCS5Padding")
+        cipher.init(Cipher.ENCRYPT_MODE, key)
+        val encrypted = cipher.doFinal(text.toByteArray())
+        return Base64.encodeToString(encrypted, Base64.DEFAULT)
+    }
+    
+    // 简单解密
+    private fun decrypt(encrypted: String): String {
+        val key = SecretKeySpec(encryptionKey.toByteArray().copyOf(16), "AES")
+        val cipher = Cipher.getInstance("AES/ECB/PKCS5Padding")
+        cipher.init(Cipher.DECRYPT_MODE, key)
+        val decoded = Base64.decode(encrypted, Base64.DEFAULT)
+        return String(cipher.doFinal(decoded))
+    }
+    
+    // 保存凭据
+    fun saveCredentials(username: String, password: String) {
+        prefs.edit()
+            .putString(usernameKey, username)
+            .putString(passwordKey, encrypt(password))
+            .apply()
+    }
+    
+    // 获取保存的用户名
+    fun getSavedUsername(): String {
+        return prefs.getString(usernameKey, "") ?: ""
+    }
+    
+    // 获取保存的密码
+    fun getSavedPassword(): String {
+        val encrypted = prefs.getString(passwordKey, null) ?: return ""
+        return try {
+            decrypt(encrypted)
+        } catch (e: Exception) {
+            ""
+        }
+    }
+    
+    // 清除凭据
+    fun clearCredentials() {
+        prefs.edit()
+            .remove(usernameKey)
+            .remove(passwordKey)
+            .apply()
+    }
+}

android/app/src/main/java/com/memory/app/ui/screen/LoginScreen.kt

@@ -117,10 +117,12 @@ fun LoginScreen(
     onLogin: (String, String) -> Unit,
     onRegister: (String, String, String) -> Unit,
     isLoading: Boolean = false,
-    error: String? = null
+    error: String? = null,
+    savedUsername: String = "",
+    savedPassword: String = ""
 ) {
-    var username by remember { mutableStateOf("") }
-    var password by remember { mutableStateOf("") }
+    var username by remember { mutableStateOf(savedUsername) }
+    var password by remember { mutableStateOf(savedPassword) }
     var nickname by remember { mutableStateOf("") }
     var isRegisterMode by remember { mutableStateOf(false) }
     var showRegisterDisabledDialog by remember { mutableStateOf(false) }
@@ -324,10 +326,10 @@ fun LoginScreen(
                     .height(56.dp),
                 shape = RoundedCornerShape(12.dp),
                 colors = ButtonDefaults.buttonColors(
-                    containerColor = Slate900,
+                    containerColor = Brand500,
                     contentColor = Color.White,
-                    disabledContainerColor = Slate400,
-                    disabledContentColor = Color.White
+                    disabledContainerColor = Brand500.copy(alpha = 0.4f),
+                    disabledContentColor = Color.White.copy(alpha = 0.7f)
                 ),
                 enabled = !isLoading && username.isNotBlank() && password.isNotBlank() && 
                     (!isRegisterMode || nickname.isNotBlank())

android/app/src/main/java/com/memory/app/ui/screen/ProfileScreen.kt

@@ -22,9 +22,7 @@ import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
-
 import androidx.compose.ui.graphics.Color
-
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
@@ -32,7 +30,6 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import coil.compose.AsyncImage
 import com.memory.app.data.model.User
-
 import com.memory.app.ui.theme.*
 import com.memory.app.util.HolidayUtils
 import com.memory.app.util.HolidayWithDays
@@ -485,5 +482,3 @@ private fun StatColumn(count: Int, label: String) {
         )
     }
 }
-
-