结算页面、设置页面

app/src/main/java/com/sw/dualscreen/utils/ActivityManager.kt

@@ -0,0 +1,57 @@
+package com.sw.dualscreen.utils
+
+import android.app.Activity
+import android.os.Process
+import java.util.Stack
+
+object ActivityManager {
+
+    private val activityStack = Stack<Activity>()
+
+    // 添加Activity到栈
+    fun addActivity(activity: Activity) {
+        activityStack.add(activity)
+    }
+
+    // 移除指定Activity
+    fun removeActivity(activity: Activity) {
+        activityStack.remove(activity)
+    }
+
+    // 获取当前Activity
+    fun currentActivity(): Activity? {
+        return if (activityStack.isEmpty()) null else activityStack.lastElement()
+    }
+
+    // 结束指定Activity
+    fun finishActivity(activity: Activity) {
+        if (!activity.isFinishing) {
+            activity.finish()
+        }
+    }
+
+    // 结束所有Activity
+    fun finishAllActivity() {
+        activityStack.forEach {
+            if (!it.isFinishing) {
+                it.finish()
+            }
+        }
+        activityStack.clear()
+    }
+
+    // 退出应用程序
+    fun exitApp() {
+        finishAllActivity()
+        Process.killProcess(Process.myPid())
+    }
+
+    fun getActivityStack(): Stack<Activity>{
+        return activityStack
+    }
+
+    fun isEmpty() : Boolean {
+        return activityStack.isEmpty()
+    }
+
+}