control a number of sms sent in android

i make an application for sending sms automatically to the incoming Number.开发者_开发问答 But the problem is that ,it send 2 sms instead of one in each call. i verified in my log, my "onreceive()" method for broadcastReceiver is called twice at the phone state changed and i dont know how to control this. have someone an idea? thanks for hepl sorry for my twisted english.

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if(EXTRA_STATE == RINGING)
    sendSMS();

Can you only check the ringing state of the incoming call? It will ensure your sms is sent only once when the incoming call is at ringing state, not others.