android SIM卡状态

[java]
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/*
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;
}
}
}

}