/*        监听sim状态改变的广播，返回sim卡的状态， 有效或者无效。       双卡中只要有一张卡的状态有效即返回状态为有效，两张卡都无效则返回无效。    */    import android.app.Service;    import android.content.BroadcastReceiver;    import android.content.Context;    import android.content.Intent;    import android.telephony.TelephonyManager;        public class SimStateReceive extends BroadcastReceiver {        private final static String ACTION_SIM_STATE_CHANGED = "android.intent.action.SIM_STATE_CHANGED";        private final static int SIM_VALID = 0;        private final static int SIM_INVALID = 1;        private int simState = SIM_INVALID;                public int getSimState() {            return simState;        }            @Override        public void onReceive(Context context, Intent intent) {            System.out.println("sim state changed");            if (intent.getAction().equals(ACTION_SIM_STATE_CHANGED)) {                TelephonyManager tm = (TelephonyManager)context.getSystemService(Service.TELEPHONY_SERVICE);                 int state = tm.getSimState();                switch (state) {                case TelephonyManager.SIM_STATE_READY :                    simState = SIM_VALID;                    break;                case TelephonyManager.SIM_STATE_UNKNOWN :                case TelephonyManager.SIM_STATE_ABSENT :                case TelephonyManager.SIM_STATE_PIN_REQUIRED :                case TelephonyManager.SIM_STATE_PUK_REQUIRED :                case TelephonyManager.SIM_STATE_NETWORK_LOCKED :                default:                    simState = SIM_INVALID;                    break;                }            }        }        }