Im using a Custom Layout Manager ArcLayoutManager and i have create a custom adapter with image view.and im set programmatically layouts in main activity. I have using a fill function in arclayout to handle the curved shape of items but my issue this my last bottom items take too much space so i want to reduce it.this is below code i have implemented in my code . :--
LinearLayout linearLayout = new LinearLayout(this); linearLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); linearLayout.setOrientation(LinearLayout.HORIZONTAL); Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.background_carouesel); BitmapDrawable bitmapDrawable = new BitmapDrawable(getResources(), bitmap); bitmapDrawable.setGravity(Gravity.CENTER); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { linearLayout.setBackground(bitmapDrawable); } else { linearLayout.setBackgroundDrawable(bitmapDrawable); }
//linearLayout.setBackgroundResource(R.drawable.background_carouesel);
setContentView(linearLayout);
// Create a RecyclerView
RecyclerView recyclerView = new RecyclerView(this);
LinearLayout.LayoutParams recyclerViewParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
recyclerView.setLayoutParams(recyclerViewParams);
ArcLayoutManager arcLayoutManager = new ArcLayoutManager(this, 0);
recyclerView.setLayoutManager(arcLayoutManager);
CarouselViewAdapter adapter = new CarouselViewAdapter(list);
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
linearLayout.addView(recyclerView);
This is my functionality code:- private int prevDy = 0;
private void fill(RecyclerView.Recycler recycler, RecyclerView.State state) {
detachAndScrapAttachedViews(recycler);
int centerX = getWidth() / 2;
int topMargin = (int) pxFromDp(context, 60f);
int itemSpacing = (int) pxFromDp(context, 50f);
int viewWidth = (int) pxFromDp(context, 200f);
int viewHeight = (int) pxFromDp(context, 230f);
int itemCount = getItemCount();
int visibleItemCount = Math.min(itemCount, 7);
float totalWidth = visibleItemCount * viewWidth + (visibleItemCount - 1) * itemSpacing;
int dy = computeVerticalScrollOffset(state); // Calculate vertical scroll offset
boolean scrollingUp = dy > prevDy;
prevDy = dy;
for (int itemIndex = 0; itemIndex < itemCount; itemIndex++) {
View view = recycler.getViewForPosition(itemIndex);
addView(view);
float itemSpacingAdjusted = (getWidth() - totalWidth) / (visibleItemCount - 1);
int left = (int) (itemIndex * (viewWidth + itemSpacingAdjusted)) - horizontalOffset + (itemIndex > 0 ? itemIndex * itemSpacing : 0);
int right = left + viewWidth;
int midX = (int) ((left + right) / 2.1f);
Pair< Integer, Double> top = computeYComponent(midX, viewHeight);
int bottom = top.first + viewHeight;
double alpha = top.second;
float distanceFromCenter = Math.abs(midX - centerX);
// Adjusted scaling factor to give more space to center items
float scale = 1.2f - 0.5f * Math.min(1f, distanceFromCenter / (float) centerX);
// Adjusted scaling for the last item to take less space
if (itemIndex == itemCount - 1) {
scale = 1.2f - 0.1f * Math.min(1f, distanceFromCenter / (float) centerX);
}
if (scrollingUp) {
view.setRotation((float) (alpha * (180 / Math.PI)) - 90f);
} else {
view.setRotation(0f); // No rotation when scrolling down
}
view.setScaleX(scale);
view.setScaleY(scale);
measureChildWithMargins(view, viewWidth, viewHeight);
layoutDecoratedWithMargins(view, left, top.first + topMargin, right, bottom);
}
for (RecyclerView.ViewHolder viewHolder : recycler.getScrapList()) {
recycler.recycleView(viewHolder.itemView);
}
}
Im usnig this link :- https://medium.com/mindvalley-technology/a-tale-of-a-curved-recycler-view-e8a1626b1b98
To reduce the space between bottom items in your ArcLayoutManager, you can adjust the curvature of the arc or modify the positioning of items. Since you want to reduce the space, you might need to change how items are laid out or how the curvature is calculated. Below, Ill outline a general approach to adjust the curvature to reduce the space between bottom items:
Adjust Arc Curvature: You can modify the curvature of the arc to decrease the space between bottom items. You can achieve this by changing the radius of the arc or adjusting the angle. Decreasing the radius or increasing the angle will result in less space between bottom items.
Update Arc Calculation Logic: Depending on your implementation of the ArcLayoutManager, you might need to adjust the logic that calculates the position of items on the arc. Ensure that the calculation considers the reduced curvature to evenly distribute items.
Heres how you can adjust the curvature in your ArcLayoutManager:
public class ArcLayoutManager extends RecyclerView.LayoutManager {
// Other existing code...
private void calculateItemFrame(Rect frame, double angle, int radius) {
int x = (int) (Math.cos(angle) * radius);
int y = (int) (Math.sin(angle) * radius);
// Adjust x and y as needed to position items correctly based on the reduced curvature
frame.set(x, y, x + mDecoratedChildWidth, y + mDecoratedChildHeight);
}
// Other existing code...
}
In this code, you may need to adjust the x and y coordinates based on the reduced curvature. Experiment with different values to achieve the desired spacing between bottom items.
Remember to test your changes thoroughly to ensure that the layout behaves as expected across different screen sizes and orientations.