TelephonyManager.java
参考Android 8.0 源码
我们使用下面的代码来获取TelephonyManager。
TelephonyManager telephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
获取SIM卡状态
我们获取到TelephonyManager之后，就可以使用getSimState（）方法来获取到SIM卡的状态了。
int sim_state = telephonyManager.getSimState();
获取的sim_state有几种常量值，如下所示：
//未知状态，表示SIM卡正在状态之间转换;
public static final int SIM_STATE_UNKNOWN = 0;
//设备中没有可用的SIM卡;
public static final int SIM_STATE_ABSENT = 1;
//已锁定，需要用户的SIM卡PIN才能解锁;
public static final int SIM_STATE_PIN_REQUIRED = 2;
//已锁定，需要用户的SIM卡PUK才能解锁;
public static final int SIM_STATE_PUK_REQUIRED = 3;
//已锁定，需要网络PIN才能解锁;
public static final int SIM_STATE_NETWORK_LOCKED = 4;
//SIM卡就绪;
public static final int SIM_STATE_READY = 5;
//SIM卡未就绪;
public static final int SIM_STATE_NOT_READY = 6;
//SIM卡错误，永久禁用;
public static final int SIM_STATE_PERM_DISABLED = 7;
//SIM错误，卡存在但有故障;
public static final int SIM_STATE_CARD_IO_ERROR = 8;
//SIM卡受限，卡存在但由于运营商限制而无法使用;
public static final int SIM_STATE_CARD_RESTRICTED = 9;
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
--------------------last line for now-------------------