android 判斷是否有sim卡及運營商

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判斷是否有sim卡的方法：

int absent = TelephonyManager.SIM_STATE_ABSENT;    
        if (1 == absent)   
        {  
         Log.d(TAG,"請確認sim卡是否插入或者sim卡暫時不可用！");  
        }  
        

判斷是哪個運營商的

  TelephonyManager telManager = (TelephonyManager) getSystemService(Activity.TELEPHONY_SERVICE);   
        String operator = telManager.getSimOperator();   
        Log.d(TAG,"operator："+operator);
        if(operator!=null)
        {   
         if(operator.equals("46000") || operator.equals("46002"))
         {   
          Log.d(TAG,"中國移動");
         }else if(operator.equals("46001")){   
          Log.d(TAG,"中國聯通");
         }else if(operator.equals("46003")){   
          Log.d(TAG,"中國電信");
         }   
        }