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- public abstract class SwipeDismissBaseActivity extends AppCompatActivity {
- 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 gestureDetector;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- gestureDetector = new GestureDetector(new SwipeDetector());
- }
- private class SwipeDetector extends GestureDetector.SimpleOnGestureListener {
- @Override
- public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
- // Check movement along the Y-axis. If it exceeds SWIPE_MAX_OFF_PATH,
- // then dismiss the swipe.
- if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
- return false;
- // Swipe from left to right.
- // The swipe needs to exceed a certain distance (SWIPE_MIN_DISTANCE)
- // and a certain velocity (SWIPE_THRESHOLD_VELOCITY).
- if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
- finish();
- return true;
- }
- return false;
- }
- }
- @Override
- public boolean dispatchTouchEvent(MotionEvent ev) {
- // TouchEvent dispatcher.
- if (gestureDetector != null) {
- if (gestureDetector.onTouchEvent(ev))
- // If the gestureDetector handles the event, a swipe has been
- // executed and no more needs to be done.
- return true;
- }
- return super.dispatchTouchEvent(ev);
- }
- @Override
- public boolean onTouchEvent(MotionEvent event) {
- return gestureDetector.onTouchEvent(event);
- }
- }
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