오류 도와주세요. ScreenReceiver [closed]

Question

http://ccdev.tistory.com/16 소스 참고했습니다.

public class ScreenReceiver extends BroadcastReceiver {

    private KeyguardManager km = null;
    private KeyguardManager.KeyguardLock keyLock = null;
    private TelephonyManager telephonyManager = null;
    private boolean isPhoneIdle = true;

    @Override
    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            if(km==null)
                km=(KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);

            if(keyLock==null)
                keyLock = km.newKeyguardLock(Context.KEYGUARD_SERVICE);

            if (telephonyManager == null){
                telephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
                telephonyManager.listen(phoneListener, PhoneStateListener.LISTEN_CALL_STATE);
            }

            if(isPhoneIdle) {
                disableKeyguard();

                Intent i = new Intent(context, LockScreenActivity.class);
                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(i);
            }

        }
    }

    public void reenableKeyguard() {
        keyLock.reenableKeyguard();
    }

    public void disableKeyguard() {
        keyLock.disableKeyguard();
    }

    private  PhoneStateListener phoneListener = new PhoneStateListener(){

        @Override

        public void onCallStateChaged(int state, String incomingNumber){
            switch (state){
                case TelephonyManager.CALL_STATE_IDLE:
                    isPhoneIdle = true;
                    break;

                case TelephonyManager.CALL_STATE_RINGING:
                    isPhoneIdle = false;
                    break;

            }

        }
    };
}

오류

Error:(56, 9) error: method does not override or implement a method from a supertype
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Error:Execution failed for task ':app:compileDebugJava'.
> Compilation failed; see the compiler error output for details.