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 在 Android 10 (API 29) 及更高版本（包括 Android 11），系统对后台启动 Activity 施加了严格的限制。默认情况下，应用程序在后台无法启动 Activity，以提高用户体验并减少不必要的干扰。以下为解决方法。

From 7d554af386150edec1cd68f6eaf700538af4e373 Mon Sep 17 00:00:00 2001
Date: Wed, 12 Jun 2024 18:37:23 +0800
Subject: [PATCH] Activity can be started in the background---.../core/java/com/android/server/wm/ActivityStarter.java      | 4 ++--1 file changed, 2 insertions(+), 2 deletions(-)diff --git a/frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java b/frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java
index 54ad4acaca..d7a7c576a4 100644
--- a/frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java
+++ b/frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java
@@ -1009,10 +1009,10 @@ class ActivityStarter {