Question

My source code is:

import android.content.Context;
import android.hardware.SensorManager;

public class ShakeEvent implements SensorEventListener  {
     private static SensorManager sensorManager;
     ...
     ...
     public static boolean isSupported (){
          sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

I receive error message that getSystemService function is undefined.
I tried to write this row also in such way:

sensorManager = (SensorManager) getContext().getSystemService(Context.SENSOR_SERVICE);

But then I receive error message that getContext() function is undefined for ShakeEvent object.
How should I write it? Thanks.

Answer 1

Your class doesn’t seem to reference any Context object. getSystemService() is a Context method, so you need a reference to context object (like an Activity) when creating the SensorEventListener. Then you’ll be able to call context.getSystemService().

import android.content.Context;
import android.hardware.SensorManager;

public class ShakeEvent implements SensorEventListener  {
     private static SensorManager sensorManager;
     private final Context context;

     public ShakeEvent(Context context) {
         this.context = context;
     }

     ...
     ...
     public static boolean isSupported (){
          sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);