ListView列表项自定义滑动效果

要为ListView列表项添加自定义滑动效果，您可以使用ListView的ItemTouchHelper类来实现。以下是一个简单的示例代码，演示如何为ListView列表项添加滑动删除的效果：

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);
        }
    }
}

在上面的代码中，CustomItemTouchHelper类继承自ItemTouchHelper.SimpleCallback，并重写了onMove()和onSwiped()方法来处理列表项的滑动操作。在onChildDraw()方法中，我们通过绘制矩形和图标来实现左右滑动的效果。

要使用CustomItemTouchHelper类，您需要为RecyclerView设置ItemTouchHelper，并传入CustomAdapter对象，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);

通过以上步骤，您可以为ListView列表项添加自定义滑动效果。您可以根据自己的需求来修改绘制的内容和效果，实现更加个性化的滑动效果。