[android] Gesture 사용하기, 특정 화면에 Gesture 씌우기

목적

viewpager를 사용할 수 없고, 화면 전환이나 그와 유사한 이벤트가 필요하여 사용.

import android.view.View.OnTouchListener;
 
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.GestureDetector.SimpleOnGestureListener;
 
    Context mContext;
    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 250;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
    private GestureDetector gestureScanner;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.xxxx);
        
        mContext = this;
 
        gestureScanner = new GestureDetector(this, mGestureListener );
    }
 
 
    @Override
    public boolean onTouchEvent(MotionEvent event) {
 
        return gestureScanner.onTouchEvent(event);  // event 전달
    }
     
    OnGestureListener mGestureListener = new OnGestureListener() {
         
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            Toast.makeText(mContext, "onSingleTapUp", Toast.LENGTH_SHORT).show();
            return false;
        }
         
        @Override
        public void onShowPress(MotionEvent e) {
            // TODO Auto-generated method stub
        }
         
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
                float distanceY) {
            // TODO Auto-generated method stub
            return false;
        }
         
        @Override
        public void onLongPress(MotionEvent e) {
            // TODO Auto-generated method stub
        }
         
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
              // right to left swipe
              if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                  Toast.makeText(mContext, "Left Swipe", Toast.LENGTH_SHORT).show();
              }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                  Toast.makeText(mContext, "Right Swipe", Toast.LENGTH_SHORT).show();
              }
            return false;
        }
         
        @Override
        public boolean onDown(MotionEvent e) {
            // TODO Auto-generated method stub
            return false;
        }
    };

문제점.

제스쳐를 설정하였지만, 이벤트가 scrollview에서는 먹지 않는 문제 발생.

위 문제를 해결하기 위한 특정 Layout 상위에서 Gesture를 사용할 때.

필자는 youtube player 위에서 제스쳐를 사용하기 위해 사용.

import android.view.View.OnTouchListener;
 
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.GestureDetector.SimpleOnGestureListener;
 
    Context mContext;
    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 250;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
    private GestureDetector gestureScanner;
    
    private ScrollView scrView;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.xxxx);
        
        mContext = this;
        
        gestureScanner = new GestureDetector(new MyGestureDetector());
 
        scrView = (ScrollView) findViewById(R.id.detail_scrView);
        View.OnTouchListener gestureListener = new View.OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                return gestureScanner.onTouchEvent(event);
            }
        };
        scrView.setOnTouchListener(gestureListener);
    }
 
 
    class MyGestureDetector extends SimpleOnGestureListener {
        
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            Toast.makeText(mContext, "onSingleTapUp", Toast.LENGTH_SHORT).show();
            return false;
        }
         
        @Override
        public void onShowPress(MotionEvent e) {
            // TODO Auto-generated method stub
             
        }
         
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
                float distanceY) {
            // TODO Auto-generated method stub
            return false;
        }
         
        @Override
        public void onLongPress(MotionEvent e) {
            // TODO Auto-generated method stub
             
        }
         
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY)
        {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(getApplicationContext(), "Left Swipe", Toast.LENGTH_SHORT).show();
            }
            // left to right swipe
            else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(getApplicationContext(), "Right Swipe", Toast.LENGTH_SHORT).show();
            }
            // down to up swipe
            else if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(getApplicationContext(), "Swipe up", Toast.LENGTH_SHORT).show();
            }
            // up to down swipe
            else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(getApplicationContext(), "Swipe down", Toast.LENGTH_SHORT).show();
            }
            return false;
        }
    }
 

Scrollview나 Youtube등에서 Gesture가 잘 동작 하는것을 확인 하였으나, 내가 원하는 만큼의 만족도를 따라오지는 못한다.

특히 youtube에서 기본 컨트롤러가 활성화 되어 있을 경우 swipe 동작을 인지 못한다. 

동작 하더라도 인식률이 70~80정도 되는 것 같다.

향후에 코드를 재사용 할 것 같아 남긴다.