Leanback VerticalGridFragment 删除顶部间距

Question

我正在使用 VerticalGridFragment 以类似网格的布局显示项目 我不需要显示搜索或标题，我希望行从屏幕顶部开始，没有任何边距。有什么帮助吗？

Answer 1

我找到了一种方法，方法是覆盖 VerticalGridFragment 的 VerticalGridPresenter，然后获取 VerticalGridView，并将顶部填充设置为更小价值。 在 CustomVerticalGridPresenter 类（扩展 VerticalGridPresenter）中，重写此方法：

@Override
protected void initializeGridViewHolder(ViewHolder vh) {
    super.initializeGridViewHolder(vh);
    gridView = vh.getGridView();
    int top= 20;//this is the new value for top padding
    int bottom = gridView.getPaddingBottom();
    int right = gridView.getPaddingRight();
    int left = gridView.getPaddingLeft();
    gridView.setPadding(left,top,right,bottom);
}

然后在 VerticalGridFragment 中，分配新的 CustomVerticalGridPresenter，如下所示：

 CustomVerticalGridPresenter gridPresenter = new CustomVerticalGridPresenter();
    gridPresenter.setNumberOfColumns(NUM_COLUMNS);
    setGridPresenter(gridPresenter);

Answer 2

您需要创建一个名为 CustomVerticalGridPresenter 的新类，并在其中输入以下代码.

public class CustomVerticalGridPresenter extends VerticalGridPresenter {

    VerticalGridView gridView;

    CustomVerticalGridPresenter(int zoom, boolean val){
        super(zoom, val);
    }

    @Override
    protected void initializeGridViewHolder(ViewHolder vh) {
        super.initializeGridViewHolder(vh);
        gridView = vh.getGridView();
        int top = 20;//this is the new value for top padding
        int bottom = gridView.getPaddingBottom();
        int right = gridView.getPaddingRight();
        int left = gridView.getPaddingLeft();
        gridView.setPadding(left,top,right,bottom);
    }
}

然后在verticalgridfragment类中使用

CustomVerticalGridPresenter videoGridPresenter = new 
CustomVerticalGridPresenter(ZOOM_FACTOR, false);

而不是

VerticalGridPresentervideoGridPresenter = new VerticalGridPresenter(ZOOM_FACTOR, false);

Answer 3

解决这个问题的另一种方法是设置 VerticalGridView 的 windowAlignment 属性。最值得注意的是......

verticalGridView.windowAlignment = BaseGridView.WINDOW_ALIGN_LOW_EDGE //this will remove the top margin
verticalGridView.windowAlignmentOffset = 0
verticalGridView.windowAlignmentOffsetPercent = 25f //find correct values for your case

Answer 4

First of follow this steps to move the rows up which is by default given margins by Lean back Library.

1. Go to you SDK.

2. Inside SDK -> extras -> android -> support -> v17 -> leanback -> res -> values.

3. Inside values folder copy the dimens.xml inside your current project and copy to your projects res -> values folder.

Now you have the file name dimens.xml inside your values folder.

Now open the dimens.xml file which you have copied.

Change the value for property defined below. By default it will given 168dp around that. So make it less to decrease the top margin as i have given below.

<dimen name="lb_browse_rows_margin_top">35dp</dimen>

现在您可以在您的 Browse Fragment 顶部的正下方拆分行。