错误:尝试调用虚拟方法的java.lang。对象:空对象引用上的android.content.Context.getSystemService(java.lang.String)'

I am trying to implement MovementDetector in my soft keyboard, but I get this error. When I compile my code everything works, but when I start using my keyboard it shows error in logcat. Here is my code:I am trying to implement MovementDetector in my