OnFling 메소드가 앱에서 작동하지 않습니다.

Question

인 텐트를 사용하여 이전 활동과 다음 활동 사이를 탐색해야하는 각 활동에 onFling()을 구현했습니다.

하지만 앱을 실행해도 작동하지 않으며 로그 고양이에 나타나지 않습니다. 코드에서 메소드 또는 사소한 실수를해야하는 다른 방법이 있습니까?

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
       float velocityY) { 
      // TODO Auto-generated method stub 
      Log.d(null,"Fling"); 
      int dx = (int) (e2.getX() - e1.getX()); 
      // don't accept the fling if it's too short 
      // as it may conflict with a button push 
      if (Math.abs(dx) > MAJOR_MOVE && Math.abs(velocityX) > Math.abs(velocityY)) { 
       if (velocityX > 0) { 
       //switch to activity on left fling 
       Intent intent = new Intent(this, MainActivity.class); 
       startActivity(intent); 

       } else { 
       //switch to activity on right fling 
       Intent intent = new Intent(this, StudentLife.class); 
       startActivity(intent);  


       } 
       return true; 

      } else { 

       return false; 
      } 
     } 

This is the whole class file to clarify some of the questions: 

    import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.res.TypedArray; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.GestureDetector.OnGestureListener; 
import android.view.MenuItem; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.Gallery; 
import android.widget.ImageView; 
import android.widget.Toast; 

@SuppressWarnings("deprecation") 
public class GalleryStudent extends Activity implements OnGestureListener { 

    private static final int MAJOR_MOVE = 0; 


    public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_galery_student); 

      Gallery g = (Gallery) findViewById(R.id.gallery); 
      g.setAdapter(new ImageAdapter(this)); 

      g.setOnItemClickListener(new OnItemClickListener() { 
       public void onItemClick(@SuppressWarnings("rawtypes") AdapterView parent, View v, int position, long id) { 
        Toast.makeText(GalleryStudent.this, "" + position, Toast.LENGTH_SHORT).show(); 
       } 
      }); 
     } 


    public boolean onOptionsItemSelected(MenuItem item) 
     { 

      switch (item.getItemId()) 
      { 
       case android.R.id.home: 
        // This is called when the Home (Up) button is pressed 
        // in the Action Bar. 
        Intent parentActivityIntent = new Intent(this, 
        MainActivity.class); 
        parentActivityIntent.addFlags(
        Intent.FLAG_ACTIVITY_CLEAR_TOP | 
        Intent.FLAG_ACTIVITY_NEW_TASK); 
        startActivity(parentActivityIntent); 
        finish(); 
        return true; 

       default: 

        return super.onOptionsItemSelected(item); 



      } 



     } 

    public void onBackPressed() { 
     Intent startMain = new Intent(Intent.ACTION_MAIN); 
      startMain.addCategory(Intent.CATEGORY_HOME); 
      startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
      startActivity(startMain); 

    } 



    public class ImageAdapter extends BaseAdapter { 


     int mGalleryItemBackground; 
     private Context mContext; 

     private Integer[] mImageIds = { 
       R.drawable.gmitlogo, 
       R.drawable.michaelcarmody, 
       R.drawable.fb 
     }; 

     public ImageAdapter(Context c) { 
      mContext = c; 
      TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery); 
      mGalleryItemBackground = a.getResourceId(
        R.styleable.HelloGallery_android_galleryItemBackground, 0); 
      a.recycle(); 
     } 

     public int getCount() { 
      return mImageIds.length; 
     } 

     public Object getItem(int position) { 
      return position; 
     } 

     public long getItemId(int position) { 
      return position; 
     } 

     public View getView(int position, View convertView, ViewGroup parent) { 
      ImageView i = new ImageView(mContext); 

      i.setImageResource(mImageIds[position]); 
      i.setLayoutParams(new Gallery.LayoutParams(150, 100)); 
      i.setScaleType(ImageView.ScaleType.FIT_XY); 
      i.setBackgroundResource(mGalleryItemBackground); 

      return i; 
     } 
    } 

    @Override 
    public boolean onDown(MotionEvent e) { 
     // TODO Auto-generated method stub 
     return false; 
    } 


    View.OnTouchListener gestureListener = new View.OnTouchListener() { 
     public boolean onTouch(View v, MotionEvent event) { 
       return detector.onTouchEvent(event); 
     } 
    }; 

    setOnTouchListener(gestureListener); 




    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
      float velocityY) { 
     Log.d(null,"Fling"); 
     int dx = (int) (e2.getX() - e1.getX()); 
     // don't accept the fling if it's too short 
     // as it may conflict with a button push 
     if (Math.abs(dx) > MAJOR_MOVE && Math.abs(velocityX) > Math.abs(velocityY)) { 
      if (velocityX > 0) { 
      //switch to activity on left fling 
      Intent intent = new Intent(this, StudentLife.class); 
      startActivity(intent); 

      } else { 
      //switch to activity on right fling 
      Intent intent = new Intent(this, StudentPortal.class); 
      startActivity(intent);  


      } 
      return true; 

     } else { 

      return false; 
     } 
    } 

Answer 1

먼저 터치 수신기를 설정 한 다음 제스처 감지기에 연결하십시오.

View.OnTouchListener gestureListener = new View.OnTouchListener() { 
       public boolean onTouch(View v, MotionEvent event) { 
         return detector.onTouchEvent(event); 
       } 
      }; 

      setOnTouchListener(gestureListener); 

이 문서가 문제를 해결하는 것입니다 : 여기

는 샘플 코드입니다.