How can I check permission in nonActivity Class?

Question

I want to get current location in my app. I tried this solution.

I have to check permission, but I cannot find how to check permission nonActivity class.

I tried this:

public class MyLocation {

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

    public boolean getLocation(Context context, LocationResult result) {

        locationResult = result;
        if (lm == null)
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);



        if (gps_enabled)
            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                return true;
            }
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
        if (network_enabled)
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
        timer1 = new Timer();


        timer1.schedule(new GetLastLocation(context), 10000);

        return true;
    }



    class GetLastLocation extends TimerTask {
        Context context;

        public GetLastLocation(Context context){
           this.context = context;
        }
        @Override
        public void run() {

            //Context context = getClass().getgetApplicationContext();
            Location net_loc = null, gps_loc = null;
            if (gps_enabled)
                if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                    return;
                }gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if(network_enabled)
                net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        }
    }

}

In my Activity I passed context;

MyLocation myLocation = new MyLocation(this);

I am getting error in permission in GetLastLocation class ;

E/AndroidRuntime: FATAL EXCEPTION: Timer-1
                                                                               Process: com.example.merve.myapplication, PID: 4124
                                                                               java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.Context.checkPermission(java.lang.String, int, int)' on a null object reference
                                                                                   at android.support.v4.content.ContextCompat.checkSelfPermission(ContextCompat.java:439)
                                                                                   at other.MyLocation$GetLastLocation.run(MyLocation.java:124)
                                                                                   at java.util.TimerThread.mainLoop(Timer.java:555)
                                                                                   at java.util.TimerThread.run(Timer.java:505)

MyLocation.java line 124:

            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && 
ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

I cannot add full code.

You can pass the `context` to the non-activity class which you want to do the check. Use the `context` then in that class to call methods that require `context` — Akram, Dec 23 '17 at 12:46
can you post the complete error log which tells the line number of the exception as well? Seems that the problem is you didn't initialize `context` field of `GetLastLocation` class. It is `null` when used. — Akram, Dec 23 '17 at 13:29
I fixed this problem according to Leo Aso's answers. However, now I cannot open the app. There is no error, I can see lat and long in the console. @Merka — merve, Dec 23 '17 at 13:49

score 1 · Accepted Answer · answered Dec 23 '17 at 13:41

1

If I had to guess, I'd say this

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

should be

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

answered Dec 23 '17 at 13:41

Leo Aso

11,898
3
25
46

Yeah, I fixed this, but now cannot open the app. İn console, I can see latitude and longitude. An there is no error – merve Dec 23 '17 at 13:47
When you say you can't open the app. do you mean it's crashing, or it's just not displaying anything? And , if it's crashing, is there a new error? – Leo Aso Dec 23 '17 at 14:00
It is not displaying anything. finish() is the reason.Thanks for your help. – merve Dec 23 '17 at 14:01

Niza Siwale · Answer 2 · 2017-12-23T13:23:41.950

0

Simply pass your activity or context object to the non-activity class. The timertask doesn't run on the main thread so you have to ask for the permission somewhere else. Maybe before creating the GetLastLocation object

edited Dec 23 '17 at 13:23

answered Dec 23 '17 at 12:49

Niza Siwale

2,390
1
18
20

Do you have the ACCESS_FINE_LOCATION permission in your menifest? – Niza Siwale Dec 23 '17 at 13:18
Yes, I give the permission – merve Dec 23 '17 at 13:19
I've up my answer – Niza Siwale Dec 23 '17 at 13:23

How can I check permission in nonActivity Class?

2 Answers2