//挂断电话,需要调用系统底层的方法,要用哪个到反射拿底层方法
public void endcall(){
//加载serviceManager的字节码
Class clazz=CallSmsSafeService.class.getClassLoader().loadClass("android.os.ServiceManager");
Method method=clazz.getDeclaredMethod("getservice",String.class);
IBinder ibind=method.invoke(null,TELEPHONY_SERVICE);
ITelephony.Stub.asInterface(ibind).endCall();
}