CallService.java

package com.mingle.myapplication.service;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.SmsManager;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;

import com.mingle.myapplication.model.SharedPreferenceUtil;

/**
 * Created by multimedia on 2016-05-16.
 */
public class CallService extends Service {

    TelephonyManager tm = null;
    private AudioManager mAudioManager;
    SmsManager smsManager;
    Boolean call=false;
    @Override
    public void onCreate() {
        mAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
        super.onCreate();
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        tm = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

        tm.listen(new PhoneStateListener() {
            @Override
            public void onCallStateChanged(int state, String incomingNumber) {
                if(SharedPreferenceUtil.getSharedPreference(getApplicationContext(), "CallServiceFrag")==1) {
                    Toast.makeText(getApplicationContext(),
                            "전화 차단 후 메시지 전송기능 사용", Toast.LENGTH_SHORT).show();
                    Log.d("DEBUG", "incomingNumber:" + incomingNumber);
                    switch (state) {
                        case TelephonyManager.CALL_STATE_IDLE: //전화가 끊긴 상태
                            if (call == true) {
                                mAudioManager.setRingerMode(mAudioManager.RINGER_MODE_VIBRATE);
                                if(SharedPreferenceUtil.getSharedPreference(getApplicationContext(), "MessageChecked")==1) {
                                    SendSMS(incomingNumber, "죄송합니다. 지금 전화를 받을 수 없습니다.");
                                }
                                Toast.makeText(getApplicationContext(), "죄송합니다. 지금 전화를 받을 수 없습니다."
                                        , Toast.LENGTH_SHORT).show();
                                call = false;
                            }
                            break;
                        case TelephonyManager.CALL_STATE_OFFHOOK: //통화중
                            break;
                        case TelephonyManager.CALL_STATE_RINGING: //전화벨 울리는 중
                            call = true;
                            mAudioManager.setRingerMode(mAudioManager.RINGER_MODE_SILENT);
                            break;
                        default:
                            break;
                    }
                }
                super.onCallStateChanged(state, incomingNumber);
            }
        }, PhoneStateListener.LISTEN_CALL_STATE);

        return super.onStartCommand(intent, flags, startId);
    }
    private void SendSMS(String phonenumber, String message) {
        try {
            smsManager = SmsManager.getDefault();
            String sendTo = phonenumber;
            String myMessage = message;

            smsManager.sendTextMessage(sendTo, null, myMessage, null, null);
        } catch (IllegalArgumentException e) {
            Log.d("전화 받고 끊을 때", "Exception");
        }

    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(getApplicationContext(),
                "전화 차단 후 메시지 전송기능 사용 안함", Toast.LENGTH_SHORT).show();
        SharedPreferenceUtil.putSharedPreference(getApplicationContext(), "CallServiceFrag", 0);
        Log.d("Service Destroy", "콜서비스 종료");
        stopSelf();

    }
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}