CustomView：自定义 View 辅助Core 1.20.0-alpha01

import androidx.customview.widget.ViewDragHelper;

public class DragLayout extends FrameLayout {
    private final ViewDragHelper dragHelper;

    public DragLayout(Context context) {
        super(context);
        dragHelper = ViewDragHelper.create(this, 1f, new ViewDragHelper.Callback() {
            @Override
            public boolean tryCaptureView(View child, int pointerId) {
                return child == draggableView;
            }

            @Override
            public int clampViewPositionHorizontal(View child, int left, int dx) {
                return Math.max(0, Math.min(getWidth() - child.getWidth(), left));
            }

            @Override
            public int clampViewPositionVertical(View child, int top, int dy) {
                return Math.max(0, Math.min(getHeight() - child.getHeight(), top));
            }

            @Override
            public void onViewReleased(View releasedChild, float xvel, float yvel) {
                // 松手后吸附回原位
                dragHelper.settleCapturedViewAt(0, 0);
                invalidate();
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return dragHelper.shouldInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        dragHelper.processTouchEvent(ev);
        return true;
    }

    @Override
    public void computeScroll() {
        if (dragHelper.continueSettling(true)) {
            invalidate();
        }
    }
}

import androidx.customview.poolingcontainer.setPoolingContainerListener

// 在容器内复用 View 时，监听回收/复用事件
view.setPoolingContainerListener { isAcquired ->
    if (isAcquired) resetViewState() else releaseResources()
}