android device ID generation gives an error

Question

In my Android app I wanna generate the device ID. At first I just generate the device ID inside an activity as below. It worked fine.

TelephonyManager tManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String uid = tManager.getDeviceId();
return uid;

Then I wanna create a device object and try to do the above in it as a method,

public String generateDeviceId() {
    // DeviceId = deviceId;

    TelephonyManager tManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
    String uid = tManager.getDeviceId();
    return uid;

}

It gives an syntax error and say

The method getSystemService(String) is undefined for the type Device

So how can I fix this. I wanna create a device class and create device object and do my stuff. Is it possible. I imported the below,

import android.content.Context;
import android.telephony.TelephonyManager;

So is it possible. Can someone help me to do my work. Thanks.

Device is a class a non Activity class? – Raghunandan Jan 01 '14 at 07:34 — Raghunandan, Jan 01 '14 at 07:34
yes. how can i generate the deviceID in the Device class. – Samantha Withanage Jan 01 '14 at 07:35 — Samantha Withanage, Jan 01 '14 at 07:35

Md Abdul Gafur · Answer 1 · 2014-01-01T07:40:37.927

1

When you try to access getSystemService outside of the android activity class then you must need the context.

    TelephonyManager tm = 
(TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);

and this are complete method

    public String generateDeviceId(Context context) {
        // DeviceId = deviceId;

        TelephonyManager tManager = (TelephonyManager)context. getSystemService(Context.TELEPHONY_SERVICE);
        String uid = tManager.getDeviceId();
        return uid;

}

Thanks

edited Jan 01 '14 at 07:40

answered Jan 01 '14 at 07:35

Md Abdul Gafur

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not working. gives a syntax error. it says "context cannot be resolved" – Samantha Withanage Jan 01 '14 at 07:38
ok now its working.... – Samantha Withanage Jan 01 '14 at 07:41

score 1 · Answer 2 · answered Jan 01 '14 at 07:35

getSystemService(String) needs a context. So you need to pass context to the constructor of Non Activity class and use it there.

new  Device(ActivityName.this);

Then

Context mContext;
public Device(Context context) 
{
     mContext = context;
}

Then

TelephonyManager tManager = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);

http://developer.android.com/reference/android/content/Context.html#getSystemService(java.lang.String)

score 1 · Answer 3 · answered Jan 01 '14 at 07:37

Try changing this method in your Device class

public String generateDeviceId(Context context) {
   // DeviceId = deviceId;
   TelephonyManager tManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
   String uid = tManager.getDeviceId();
   return uid;
}

and While calling from your Activity , just pass the current activity reference this

 deviceObject.generateDeviceId(this);

android device ID generation gives an error

3 Answers3