Get Signal Strength in Android

Question

I want to get the Signal Strength of the Device at the point I hit the API call. I have searched on all the related threads and I am not successful yet.

So I would like to get the signal strength like

SignalStrength ss = null  ; // some initialization  int n = ss.getGsmSignalStrength(); 

But while using this, it is obvious that I will get null pointer exception since I have initialised SignalStrength as null. But I don't know how to initialise this.

Also that I don't want to use PhoneStateListener because it is triggered only if the signal changes.

I am getting the Signal Strength using the below code

TelephonyManager telephonyManager = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE); CellInfoGsm cellinfogsm = (CellInfoGsm)telephonyManager.getAllCellInfo().get(0); CellSignalStrengthGsm cellSignalStrengthGsm = cellinfogsm.getCellSignalStrength(); cellSignalStrengthGsm.getDbm(); 

But I don't want to use CellSignalStrength because it is only added in API Level 17 and will not work under 17. I want the code to work on API Level 7+.

Or is there any other method, so that I could get the signal strength at the point of hitting the API call?

Answer 1

Define Variables:

TelephonyManager mTelephonyManager; MyPhoneStateListener mPhoneStatelistener;    int mSignalStrength = 0; 

Then add this class to your code:

class MyPhoneStateListener extends PhoneStateListener {       @Override      public void onSignalStrengthsChanged(SignalStrength signalStrength) {          super.onSignalStrengthsChanged(signalStrength);          mSignalStrength = signalStrength.getGsmSignalStrength();          mSignalStrength = (2 * mSignalStrength) - 113; // -> dBm                 }  } 

and in your onCreate method use:

mPhoneStatelistener = new MyPhoneStateListener(); mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); mTelephonyManager.listen(mPhoneStatelistener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);