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您可以通過使用ItemTouchHelper類來實現(xiàn)RecyclerView列表項滑動邊緣彈性效果。下面是一個簡單的示例代碼:
public class MyItemTouchHelper extends ItemTouchHelper.Callback {
private static final float ALPHA_FULL = 1.0f;
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
return makeMovementFlags(dragFlags, swipeFlags);
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
// 拖動時的處理
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
// 滑動時的處理
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
// 實現(xiàn)邊緣彈性效果
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
// 獲取RecyclerView中的子View
View itemView = viewHolder.itemView;
// 獲取RecyclerView中子View寬度
int itemWidth = itemView.getWidth();
float alpha = ALPHA_FULL - Math.abs(dX) / (float) itemWidth;
// 設(shè)置子View的透明度
itemView.setAlpha(alpha);
// 設(shè)置子View的縮放比例
itemView.setScaleX(alpha);
itemView.setScaleY(alpha);
}
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
// 當(dāng)用戶拖動或滑動一個item時執(zhí)行
}
super.onSelectedChanged(viewHolder, actionState);
}
@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
// 當(dāng)用戶拖動或滑動完成后執(zhí)行
viewHolder.itemView.setAlpha(ALPHA_FULL);
viewHolder.itemView.setScaleX(ALPHA_FULL);
viewHolder.itemView.setScaleY(ALPHA_FULL);
super.clearView(recyclerView, viewHolder);
}
}
然后在你的Activity或Fragment中創(chuàng)建ItemTouchHelper,并將其附加到RecyclerView上:
ItemTouchHelper.Callback callback = new MyItemTouchHelper();
ItemTouchHelper touchHelper = new ItemTouchHelper(callback);
touchHelper.attachToRecyclerView(recyclerView);
這樣,您就可以實現(xiàn)RecyclerView列表項滑動邊緣彈性效果了。希望對您有幫助!
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