SensorEventListener不注销本身 [英] SensorEventListener not unregistering itself

问题描述

我一直在开发一个需要几个步骤进行加速度计校准的应用程序。

I have been developing an application which needs to perform accelerometer calibration in several steps.

我所做的，就是创建一个SensorEventListener，获取一定量的读数，并在达到该数额之后，我称之为'的SensorManager（）。unregisterListener（事件监听）。

What I have done, is create a SensorEventListener that gets a certain amount of readings, and after that amount is reached, I call 'sensorManager().unregisterListener(eventListener)'.

不过，我认为该行没有注销监听器，因为紧接着，在同一行被调用时，作为继续运行的结果。

However, I think this line is not unregistering the listener, since immediately afterwards, the same line is called, as a result of continuing to run.

问：我是在做正确的事情这样，还是应该调节我的处理程序，以便达到这个条件后，它不会允许自己运行（如果使用的）

Question: am I doing things properly this way, or should condition my handler so that after reaching this condition it doesn't allow itself to run (using if's)?

推荐答案

如果您已经注册的后您SensorEventListener只被调用一次，那么这很可能的行为是由于的竞争条件，由于Android系统的多线程特性。所以，如果你想关闭处理的读数，然后（如你建议），你应该设置一个布尔变量和if语句，以确保没有进一步的处理测试一旦你已经达到上限。

If your SensorEventListener only gets called once after you've unregistered it then this behaviour is probably due to a race condition, due to the multi-threaded nature of Android. So if you want to shut off processing the readings, then (as you suggest) you should set a boolean variable and test it with if statements to ensure no further processing once you've reached your limit.

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