android SIM卡状态监听TelephonyManager_android telephonymanager getsimstate

/*
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;  
        }  
    }  
}  
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}