ListView列表項自定義滑動效果

要為ListView列表項添加自定義滑動效果，您可以使用ListView的ItemTouchHelper類來實現。以下是一個簡單的示例代碼，演示如何為ListView列表項添加滑動刪除的效果：

public class CustomItemTouchHelper extends ItemTouchHelper.SimpleCallback {

    private CustomAdapter mAdapter;

    public CustomItemTouchHelper(CustomAdapter adapter) {
        super(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);
        mAdapter = adapter;
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        return false;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        int position = viewHolder.getAdapterPosition();
        mAdapter.removeItem(position);
    }

    @Override
    public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
            View itemView = viewHolder.itemView;
            Paint paint = new Paint();
            Bitmap icon;

            if (dX > 0) {
                paint.setColor(Color.parseColor("#388E3C"));
                icon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_edit);
                c.drawRect((float) itemView.getLeft(), (float) itemView.getTop(), dX, (float) itemView.getBottom(), paint);
                c.drawBitmap(icon, (float) itemView.getLeft() + 16, (float) itemView.getTop() + ((float) itemView.getBottom() - (float) itemView.getTop() - icon.getHeight()) / 2, paint);
            } else {
                paint.setColor(Color.parseColor("#D32F2F"));
                icon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_delete);
                c.drawRect(dX, (float) itemView.getTop(), (float) itemView.getRight(), (float) itemView.getBottom(), paint);
                c.drawBitmap(icon, (float) itemView.getRight() - 16 - icon.getWidth(), (float) itemView.getTop() + ((float) itemView.getBottom() - (float) itemView.getTop() - icon.getHeight()) / 2, paint);
            }

            super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
        }
    }
}

在上面的代碼中，CustomItemTouchHelper類繼承自ItemTouchHelper.SimpleCallback，并重寫了onMove()和onSwiped()方法來處理列表項的滑動操作。在onChildDraw()方法中，我們通過繪制矩形和圖標來實現左右滑動的效果。

要使用CustomItemTouchHelper類，您需要為RecyclerView設置ItemTouchHelper，并傳入CustomAdapter對象，示例如下：

CustomAdapter adapter = new CustomAdapter(data);
RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setAdapter(adapter);

CustomItemTouchHelper itemTouchHelper = new CustomItemTouchHelper(adapter);
ItemTouchHelper touchHelper = new ItemTouchHelper(itemTouchHelper);
touchHelper.attachToRecyclerView(recyclerView);

通過以上步驟，您可以為ListView列表項添加自定義滑動效果。您可以根據自己的需求來修改繪制的內容和效果，實現更加個性化的滑動效果。