Detecting “use only 2G networks” setting

Question

Is there a way of returning the value of Android\'s mobile network setting for \"use only 2G networks\"?

The app being developed measures the internet speed at a certain

Answer 1

As far as I can tell, there is no documented way of getting value for that setting. But there is a Use2GOnlyCheckBoxPreference class that can be used as an example. It uses internal Phone and PhoneFactory classes to obtain the current value of prefer_2g setting.

You can use Phone and PhoneFactory classes via reflection. But of cause this is undocumented and is on your own risk. Here is relevant code from Use2GOnlyCheckBoxPreference:

import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneFactory;

public class Use2GOnlyCheckBoxPreference extends CheckBoxPreference {

    private Phone mPhone;
    private MyHandler mHandler;

    public Use2GOnlyCheckBoxPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mPhone = PhoneFactory.getDefaultPhone();
        mHandler = new MyHandler();
        mPhone.getPreferredNetworkType(
                mHandler.obtainMessage(MyHandler.MESSAGE_GET_PREFERRED_NETWORK_TYPE));
    }

    private class MyHandler extends Handler {

        private static final int MESSAGE_GET_PREFERRED_NETWORK_TYPE = 0;

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MESSAGE_GET_PREFERRED_NETWORK_TYPE:
                    handleGetPreferredNetworkTypeResponse(msg);
                    break;
            }
        }

        private void handleGetPreferredNetworkTypeResponse(Message msg) {
            AsyncResult ar = (AsyncResult) msg.obj;

            if (ar.exception == null) {
                int type = ((int[])ar.result)[0];
                Log.i(LOG_TAG, "get preferred network type="+type);
                setChecked(type == Phone.NT_MODE_GSM_ONLY);
            } else {
                // Weird state, disable the setting
                Log.i(LOG_TAG, "get preferred network type, exception="+ar.exception);
                setEnabled(false);
            }
        }
    }   
}