要调整RecyclerView中GridLayout的smoothScrollTo()方法的速度,可以通过自定义LayoutManager来实现。
首先,创建一个自定义的GridLayoutLayoutManager类,继承自GridLayoutManager,并重写smoothScrollToPosition()方法。
public class CustomGridLayoutManager extends GridLayoutManager {
private static final float MILLISECONDS_PER_INCH = 50f; // 调整速度的因子
public CustomGridLayoutManager(Context context, int spanCount) {
super(context, spanCount);
}
@Override
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
CustomLinearSmoothScroller linearSmoothScroller =
new CustomLinearSmoothScroller(recyclerView.getContext());
linearSmoothScroller.setTargetPosition(position);
startSmoothScroll(linearSmoothScroller);
}
private class CustomLinearSmoothScroller extends LinearSmoothScroller {
public CustomLinearSmoothScroller(Context context) {
super(context);
}
@Override
public PointF computeScrollVectorForPosition(int targetPosition) {
return CustomGridLayoutManager.this.computeScrollVectorForPosition(targetPosition);
}
@Override
protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
return MILLISECONDS_PER_INCH / displayMetrics.densityDpi;
}
}
}
然后,在使用RecyclerView时,将LayoutManager设置为自定义的CustomGridLayoutManager。示例代码如下:
RecyclerView recyclerView = findViewById(R.id.recyclerView);
CustomGridLayoutManager layoutManager = new CustomGridLayoutManager(this, 2);
recyclerView.setLayoutManager(layoutManager);
// 其他设置和适配器的初始化...
// 使用smoothScrollToPosition()方法滚动到指定位置
layoutManager.smoothScrollToPosition(recyclerView, null, targetPosition);
通过自定义LayoutManager并重写smoothScrollToPosition()方法和calculateSpeedPerPixel()方法,可以调整GridLayout的smoothScrollTo()方法的滚动速度。可以根据自己的需求调整MILLISECONDS_PER_INCH的值来改变速度。