Android：当应用程序处于后台时，未从 BroadcastReceiver 调用 Activity

Question

当应用程序打开时，它工作正常，但当应用程序在后台时，调用 BroadcastReceiver 但活动意图不工作

  class FakeCallReceiver : BroadcastReceiver() {
    
        override fun onReceive(context: Context, intent: Intent?) {
            
            LogUtils.d("===onReceive 1")
            setCustomSetting(context)
            LogUtils.d("===onReceive 2")
            val incomingCallActivity =  Intent(context.applicationContext, FakeCallActivity::class.java)
            incomingCallActivity.flags = Intent.FLAG_ACTIVITY_NEW_TASK
            context.startActivity(incomingCallActivity)
            LogUtils.d("===onReceive 3")
        }

        fun setCustomSetting(context: Context){
            val wakeLock: PowerManager.WakeLock =
                (context.getSystemService(Context.POWER_SERVICE) as PowerManager).run {
                    newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyApp::MyWakelockTag").apply {
                        acquire()
                    }
                }
            val mKeyguard = (context.getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager).apply {
                newKeyguardLock("MyApp::Keyguard").disableKeyguard()
            }        
        }
    }

所有日志都是打印的，没有发生异常但仍然没有调用FakeCallActivity

MinSdkVersion = 24
TargetSdkVersion = 29

1.我有错吗？
2. 应用在后台时是否有其他方法可以打开活动？

Answer 1

从 Android 10（API 级别 29）开始，从后台打开 Activity 会受到限制。检查这个 - https://developer.android.com/guide/components/activities/background-starts。

您应该尽量避免这种情况，或者您可以检查这些异常 - https://developer.android.com/guide/components/activities/background-starts#exceptions。如果有任何例外对您有用，那么您可以尝试这样做。