get current SignalStrengths android

I开发者_开发百科 want to get current Signal Strengths in android device on any button click.

I have written this

public static int getSignal(Context c) {
    class MyPhoneStateListener extends PhoneStateListener {

        int signal;

        @Override
        public void onSignalStrengthsChanged(SignalStrength signalStrength) {
            super.onSignalStrengthsChanged(signalStrength);
            signal = signalStrength.getGsmSignalStrength();
        }
    }
    TelephonyManager Tel;
    MyPhoneStateListener MyListener;
    MyListener = new MyPhoneStateListener();
    Tel = (TelephonyManager) c.getSystemService(Context.TELEPHONY_SERVICE);
    Tel.listen(MyListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
    Tel.listen(MyListener, PhoneStateListener.LISTEN_NONE);
    return MyListener.signal;
}

code but it always returns me 0

Please somebody tell me how to get current Signal Strengths.

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code but it always return me 0

Of course. onSignalStrengthsChanged() will not have been called yet. And, you stop listening with your LISTEN_NONE line, so you will probably never

Please any body tell me how to get current Signal Strengths.

You will get the signal strength in onSignalStrengthsChanged(), once a change has been detected in the signal strength, if you get rid of the LISTEN_NONE line. Only use LISTEN_NONE when you are done with the listener.