Android(安卓)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;            }        }    }}
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