问题描述
在使用 Android R/targetSdkVersion 30 时，有没有办法在前台服务从后台启动时开始录制音频或视频，例如警报接收器？
也许我做错了什么或不明白如何安排闹钟？
他们不希望应用程序在没有用户交互的情况下开始录制。当用户按下按钮或通知时，录制运行正常。他们说我可以使用 PendindIntent - 所以我用它来设置一个稍后启动服务的警报，不是吗？但是当警报接收器启动服务并尝试录制时 - 它被此消息阻止：
"从后台启动的前台服务不能有
位置/相机/麦克风访问“
他们声明：
When a foreground service starts in one of the following situations,the service is exempt from the restrictions on while-in-use access to location,camera,and microphone:
The service is started by a system component.
The service is started by interacting with app widgets.
The service is started by interacting with a notification.
The service is started as a **PendingIntent** that is sent from a different,visible app.
The service is started by an app that is a device policy controller that is running in device owner mode.
The service is started by an app which provides the **VoiceInteractionService**.
The service is started by an app that has the START_ACTIVITIES_FROM_BACKGROUND privileged permission.
我不完全理解的选项，也许可以解开这个谜：
- 立即运行服务，直到警报响起。它可以工作，但会耗尽电池电量。
- “VoiceInteractionService”作为服务的启动还是将服务转换为 VoiceInteractionService？
- 将服务更改为“AccessibilityService” - 我读到 google play 不喜欢它。
- 使用 JobScheduler 而不是 alarmreceiver 或其他 Worker 类型？
我试过这样的直接报警：
Intent intent = new Intent(mContext,MainService.class);
intent.setAction(Constants.ACTION.ALARM_START_AND_RECORD);
PendingIntent pendingIntent = PendingIntent.getService(mContext,intent,0);
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,cal.getTimeInMillis(),pendingIntent);
或者使用报警接收器：
Intent intent = new Intent(mContext,AlarmReceiver.class);
intent.setAction(Constants.ACTION.ALARM_START_AND_RECORD);
pendingIntent = PendingIntent.getbroadcast(this.getActivity(),REQUEST_SET_ALARM,PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,pendingIntent);
定位 sdk 29 (targetSdkVersion 29) 没有帮助，它之前有帮助，但看起来他们已经改变了上一个 android 11 :-(
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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