Android 监听 SIM 卡状态

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;

public class SimStateReceiver 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) {
        // 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;
            }
        }
    }
}