getSystemServices is undefined when called in a Fragment?

Question

I want TextViews to display the sensors readings in a Fragment. When trying to initialize the SensorManager the getSystemServices is undefined in the Fragment, eclipse says.Why and how to fix it.

Fragment

public class FragSensors extends Fragment {

private TextView accXTv, accYTv, accZTv;
private SensorManager sensorManager;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    View v = inflater.inflate(R.layout.frag_sensors, container, false);
    accXTv = (TextView) v.findViewById(R.id.accXValue);
    accYTv = (TextView) v.findViewById(R.id.accYValue);
    accZTv = (TextView) v.findViewById(R.id.accZValue);
    return v;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

}

private final SensorEventListener mSensorListener = new SensorEventListener() {

    @Override
    public void onSensorChanged(SensorEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onAccuracyChanged(Sensor arg0, int arg1) {
        // TODO Auto-generated method stub

    }
};

}

score 187 · Accepted Answer · answered Jun 26 '14 at 09:55

187

Just one more method call:

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

Why that one extra method call?
the getSystemService() method that provides access to system services comes from Context. An Activity extends Context, a Fragment does not. Hence, you first need to get a reference to the Activity in which the Fragment is contained and then magically retrieve the system service you want.

answered Jun 26 '14 at 09:55

An SO User

24,612
35
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2

`getActivity()` can return null if it's not attached in the moment. Although it's extremely rare condition it can happen. – ruX Jun 28 '18 at 20:27

score 33 · Answer 2 · answered Jun 26 '14 at 09:54

33

Use:

getActivity().getSystemService(name)

answered Jun 26 '14 at 09:54

Zoran

1,484
1
10
13

score 6 · Answer 3 · answered Aug 25 '19 at 16:51

6

On Kotlin use:

this.sensorManager = activity!!.getSystemService(Context.SENSOR_SERVICE) as SensorManager

answered Aug 25 '19 at 16:51

gundrabur

843
10
12

score 4 · Answer 4 · answered Aug 28 '17 at 07:21

4

sensorManager = (SensorManager) getActivity().getSystemService(Context.NAMEOF_SERVICE);

Fragments cannot directly call System Services , You have to use Activity with which these Fragment is Attached

answered Aug 28 '17 at 07:21

Muhammad Usman

795
7
19

score 4 · Answer 5 · edited May 24 '20 at 21:16

4

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

edited May 24 '20 at 21:16

β.εηοιτ.βε

33,893
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answered May 24 '20 at 19:59

Anik

51
4

While this code may answer the question, providing additional context regarding why and/or how this code answers the question improves its long-term value. – β.εηοιτ.βε May 24 '20 at 21:16

score 1 · Answer 6 · answered Jun 06 '21 at 16:53

1

In my case this helped:

val manager = context!!.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager

answered Jun 06 '21 at 16:53

user1892777

131
2
7

score 0 · Answer 7 · answered Jul 15 '18 at 05:45

0

You can also get the context from the LayoutInflater.

SensorManager sm = (SensorManager) getLayoutInflater().getContext().getSystemService(Context.SENSOR_SERVICE);

answered Jul 15 '18 at 05:45

Jeffrey

1,998
1
25
22

score 0 · Answer 8 · answered Feb 01 '20 at 07:28

For kotlin this is what worked for me.

private fun hideKeyboard() {
        val inputManager = activity?.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        if (inputManager.isAcceptingText) {
            inputManager.hideSoftInputFromWindow(activity?.currentFocus?.windowToken, 0)
        }
    }

getSystemServices is undefined when called in a Fragment?

8 Answers8

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