android SIM卡状态

/*     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;}@Overridepublic 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;}}}}