Sample project for listview swipe animations.
The need arose when I wanted to implement full swipe action on a ListView item. Since ListView has not any predefined gesture like this I thought I would give it a try and write my own code. Which for me fulfils the requirements.
We used FrameLayout as root so that we can acheive overlapping behaviour.
See for more details.
Layers are marked 1 (bottom) to 3 (top).
The main logic is in onTouch of class. Here is the sneak peek with comments to clarify code.
public boolean onTouch(View view, MotionEvent event) {
// assuming that the view to be swiped has full screen width
// initialize width if it is not initialized yet
if (mWidth == 0) {
mWidth = view.getMeasuredWidth();
midPoint = mWidth / 2.0f;
}
// this block saves width of the buttons/views where top view will settle after swipe
if (measuredFromLeft == 0) {
measuredFromRight = remove.getMeasuredWidth(); // it will settle from a distance of 1 view unit from right
measuredFromLeft = measuredFromRight * 2; // it will settle from a distance of 2 view unit from right
}
//Log.d(TAG, "onTouch: " + event.getActionMasked());
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
dX = view.getX() - event.getRawX(); // calculate distance between pointer touch and view initials
// this is necessary other wise view will jump to whereeven the screen is Tapped
lastAction = MotionEvent.ACTION_DOWN; // set last action for future checks (in ACTION_UP)
startingMove = view.getX(); // starting X coordinates
break;
case MotionEvent.ACTION_MOVE:
// while user drags move the view along
view.setX(event.getRawX() + dX); // with difference in views initial position to be covered
lastAction = MotionEvent.ACTION_MOVE; // update last action
break;
case MotionEvent.ACTION_CANCEL: // in case the pointer (Down) is canceled
case MotionEvent.ACTION_UP: {
// if this was after a drag, calculate position and states
if (lastAction == MotionEvent.ACTION_MOVE) {
// Log.d(TAG, "onTouch: X-axis of view: " + view.getX());
if (view.getX() - startingMove > 0) { // RIGHT SWIPE
// Log.d(TAG, "onTouch: swiped right");
// if swipe is as long as it crossed half the screen length
if (view.getX() > midPoint) {
Toast.makeText(context, "Full Swipe to Right", Toast.LENGTH_SHORT).show();
restore(view);
} else if (CURRENT_STATE == RIGHT_OPTIONS_OPENED) { // if right views were visible
restore(view); // they should be hidden
} else {
toLeftOptions(view); // no views were visible so right swipe should show left options
}
} else {
// if not right swipe then left swipe (duh)
//Log.d(TAG, "onTouch: swiped left");
if (view.getX() * -1 > midPoint) { // check if swipe passed mid screen as full swipe
Toast.makeText(context, "Full Swipe to Left", Toast.LENGTH_SHORT).show();
} else if (CURRENT_STATE == LEFT_OPTIONS_OPENED) {
// if left options (views) are visible restore the whole view
restore(view);
} else { // if the list item was in initial position then show right options on left swipe
toRightOptions(view);
}
}
// NOTE THAT ONLY ONE SIDE OPTIONS ARE VISIBLE AT ONCE
}
}
break;
}
//Log.d(TAG, "onTouch: " + mWidth);
return true;
}
}
Copyright 2017 Talha Hasan Zia
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
See the LICENSE.md file for details