Android实现监听电话呼叫状态的方法

// 取得电话服务TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);//监听电话的状态telManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);PhoneStateListener listener = new PhoneStateListener(){  @Override public void onCallStateChanged(int state, String incomingNumber) {  switch (state){  case TelephonyManager.CALL_STATE_IDLE: /* 无任何状态时 */  break;  case TelephonyManager.CALL_STATE_OFFHOOK: /* 接起电话时 */  break;   case TelephonyManager.CALL_STATE_RINGING: /* 电话进来时 */  break;  default: break;  } super.onCallStateChanged(state, incomingNumber); }};