package com.androidbook;

import java.util.ArrayList;
import android.app.Activity;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.Prediction;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class HelloActivity extends Activity implements OnGesturePerformedListener{
 private static final String TAG = \"Gesture Revealer\";
 GestureLibrary gestureLib = null;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  //gestureLib = GestureLibraries.fromRawResource(this, R.raw.gestures);
  gestureLib = GestureLibraries.fromFile(\"/sdcard/gestures\");
  if(!gestureLib.load()) {
   Toast.makeText(this, \"/sdcard/gestures에서 로딩 할 수 없습니다.\",
     Toast.LENGTH_SHORT).show();
   finish();
  }
  Log.v(TAG, \"Library features:\");
  Log.v(TAG, \" Orientataion style: \" + gestureLib.getOrientationStyle());
  for( String gestureName : gestureLib.getGestureEntries()) {
   Log.v(TAG, \"For gesture \" + gestureName);
   int i = 1;
   for( Gesture gesture : gestureLib.getGestures(gestureName)) {
    Log.v(TAG, \"  \" + i + \": ID: \" + gesture.getID());
    Log.v(TAG, \"  \" + i + \": Strokes count: \" + gesture.getStrokesCount());
    Log.v(TAG, \"  \" + i + \": Strokes length: \" + gesture.getLength());
    i++;
   }
  }
  
  GestureOverlayView gestureView = (GestureOverlayView) findViewById(R.id.gestureOverlay);
  gestureView.addOnGesturePerformedListener(this);
  
 }
 
 @Override
 public void onGesturePerformed(GestureOverlayView view, Gesture gesture) {
  ArrayList<Prediction> predictions = gestureLib.recognize(gesture);
  
  if(predictions.size() > 0) {
   Prediction prediction = (Prediction) predictions.get(0);
   if(predictions.size() > 1.0) {
    Toast.makeText(this, prediction.name, Toast.LENGTH_SHORT).show();
    for(int i=0; i<predictions.size(); i++)
     Log.v(TAG, \"prediction\" + predictions.get(i).name + \" - score = \" + predictions.get(i).score);
    
    
   }
  }
 }
}
저 부분에서 에러가 나는데
왜 에러가 나는 걸까요???? ㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠ



The method onGesturePerformed(GestureOverlayView, Gesture) of type HelloActivity must override a superclass method

이런 에러 메시지가 떠요