android SIM卡狀態

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/*
     監聽sim狀態改變的廣播，返回sim卡的狀態， 有效或者無效。
    雙卡中只要有一張卡的狀態有效即返回狀態爲有效，兩張卡都無效則返回無效。
 */
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;
            }
        }
    }

}