优化UI

app/src/main/java/com/example/defenseapplication/login/LoginActivity.kt

@@ -1,5 +1,7 @@
 package com.example.defenseapplication.login
 import android.content.Intent
+import android.graphics.Color
+import android.graphics.drawable.GradientDrawable
 import com.example.defenseapplication.R
 import android.os.Bundle
 import android.os.CountDownTimer
@@ -22,6 +24,11 @@ class LoginActivity : AppCompatActivity() {
         binding = ActivityLoginBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
+        // 设置渐变背景
+        val startColor = Color.parseColor("#CBEBFA")
+        val endColor = Color.parseColor("#FFF2EF")
+        setGradientBackground(binding.main, startColor, endColor)
+
         setupTabListeners()
         setupClickListeners()
         switchToSmsMode()
@@ -159,4 +166,15 @@ class LoginActivity : AppCompatActivity() {
             }
         }.start()
     }
+
+    private fun setGradientBackground(
+        view: android.view.View,
+        startColor: Int,
+        endColor: Int,
+        orientation: GradientDrawable.Orientation = GradientDrawable.Orientation.TL_BR
+    ) {
+        val gradientDrawable = GradientDrawable(orientation, intArrayOf(startColor, endColor))
+        gradientDrawable.gradientType = GradientDrawable.LINEAR_GRADIENT
+        view.background = gradientDrawable
+    }
 }