Android O：PHONE_STATE广播限制 [英] Android O : PHONE_STATE broadcast limitation

问题描述

我一直在尝试做一些与truecaller应用类似的事情，在该应用中，我的应用应该在呼叫挂断后显示屏幕。通过在清单文件中注册 android.intent.action.PHONE_STATE 隐式广播来实现这一点。

I have been trying to do something similar to truecaller app, where my app is supposed to show a screen after a call gets hung up. Was achieving this by registering android.intent.action.PHONE_STATE implicit broadcast in the manifest file.

但是如果 Android O广播限制，我正在尝试找出此用例的替代解决方案。

But it is not working if I change the app to target Android O, because of the Android O broadcast limitation, and I'm trying to figure out an alternative solution to this use case.

android文档中建议的替代解决方案：工作计划程序或注册服务与上下文。

Alternative solutions suggested in android docs: Job scheduler or register a service with context.

工作计划程序：：由于 Job Scheduler 优化会导致接收回调的延迟。因此，如果在通话和轮询之后每隔几分钟显示我们的应用程序屏幕，每隔几秒钟就会显示一次我们的应用程序屏幕，则这会影响用户体验。

Job scheduler: Because of the Job scheduler optimizations there will be some delay to receive the callback. So it will affect the user experience if our app screen is shown a few min after the phone call and polling to check for new call logs every few seconds causes battery drain issue.

在Java中使用上下文注册服务：即使该应用未处于活动状态，我也希望该行为能够正常运行。如果系统终止了 Service ，这将无法正常工作。

Register service with context in Java: I want the behavior to work even if the app is not active or alive. This will not work if the system kills the Service.

注册前台服务 ：这需要始终向用户显示通知，这将是对用户的垃圾邮件，并且24/7全天候运行服务会消耗大量资源，从而无法达到广播限制的整个目的。

Register a Foreground Service: This requires a notification to be shown to the user all the time, which would be spam the user, and running a service 24/7 consumes lots of resources which defeats the whole purpose of broadcast limitation.

请提出一个替代解决方案，以使用户体验保持不变。

Please suggest an alternate solution so that the user experience remains the same.

预先感谢

推荐答案

因为没有适当的解决方案，从Android O读取PHONE_STATE。我们可以寻求的最佳选择是从内容提供商。这样，就可以保持通话结束后显示屏幕（有几秒钟的延迟）的行为。

As there is NO proper solution to read the PHONE_STATE from Android O. The best alternative we can go for is to trigger a job on new call log entry from the content provider. By this, the behaviour is maintained of showing a screen(with a few sec of delay) after the call ends.

注意：缺点是我们无法获得的状态。电话（正在响铃或摘机等）。仅在将新的呼叫日志添加到系统数据库之后，才可以接收回叫。

NOTE : The disadvantage is we cannot get the state of the phone call(Ringing or off_the_hook etc.,). The call back will only be received after the new call log has been added to the System DB.

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