Gesture based action

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Here we are discussing about how to set that as the gesture listener for the views that I add.My requirement : I have list of images in a listview with url. When the user wants view the full image then user click the image on the list viewit will take to me the anonther activity and open in a imageview. and as a user wants to tee the next nexe or previous image with come back to listview page
Solution : I have created the HashMap Contains the list of images and pass the selected images name as bundle string. In a detail view created the async task the fetch image from the internetimplement the gestureListener. In this article we discussing about that
Related : gesture move action, gesture based action, example geatures
1. Create a Activity implements OnClickListener public class MySample1Activity extends Activity implements OnClickListener { ........ }2. Initialize below required object for gestureListener ViewConfiguration vc;
static int SWIPE_MAX_OFF_PATH = 250; static int SWIPE_MIN_DISTANCE = 100; static int SWIPE_THRESHOLD_VELOCITY = 100;
private GestureDetector gestureDetector; View.OnTouchListener gestureListener;
3. Set Densitybased velocity vc = ViewConfiguration.get(this); SWIPE_MIN_DISTANCE = vc.getScaledTouchSlop(); SWIPE_THRESHOLD_VELOCITY = vc.getScaledMinimumFlingVelocity();
4. Create a Custom GestureListener class which extends SimpleOnGestureListenerclass MyGestureDetector extends SimpleOnGestureListener {
}
5. Override the onFling() and implement the geature move action@Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { try { 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(MySample1Activity.this, "Left Swipe", Toast.LENGTH_SHORT).show(); } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { Toast.makeText(MySample1Activity.this, "Right Swipe", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { // nothing } return false; }
Full SourceCodepublic class MySample1Activity extends Activity implements OnClickListener { /** Called when the activity is first created. */ TextView tView;
ViewConfiguration vc;
static int SWIPE_MAX_OFF_PATH = 250; static int SWIPE_MIN_DISTANCE = 100; static int SWIPE_THRESHOLD_VELOCITY = 100;
private GestureDetector gestureDetector; View.OnTouchListener gestureListener;
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tView = (TextView) findViewById(R.id.textview1); vc = ViewConfiguration.get(this); SWIPE_MIN_DISTANCE = vc.getScaledTouchSlop(); SWIPE_THRESHOLD_VELOCITY = vc.getScaledMinimumFlingVelocity();
gestureDetector = new GestureDetector(new MyGestureDetector()); gestureListener = new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (gestureDetector.onTouchEvent(event)) { return true; } return false; } }; tView.setOnClickListener(this); tView.setOnTouchListener(gestureListener); }
class MyGestureDetector extends SimpleOnGestureListener { @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { try { 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(MySample1Activity.this, "Left Swipe", Toast.LENGTH_SHORT).show(); } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { Toast.makeText(MySample1Activity.this, "Right Swipe", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { // nothing } return false; } }
@Override public void onClick(View v) { // TODO Auto-generated method stub
}
}