回收器在安卓电视中查看项目焦点

Question

如何在安卓电视应用程序中专注于回收器查看项目？

我正在使用回收器视图，在水平回收器视图的右侧带有图像视图。

Answer 1

public abstract class TrackSelectionAdapter<VH extends TrackSelectionAdapter.ViewHolder> extends RecyclerView.Adapter<VH> {
// Start with first item selected
private int selectedItem = 0;
@Override
public void onAttachedToRecyclerView(final RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
// Handle key up and key down and attempt to move selection
recyclerView.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
RecyclerView.LayoutManager lm = recyclerView.getLayoutManager();
// Return false if scrolled to the bounds and allow focus to move off the list
if (event.getAction() == KeyEvent.ACTION_DOWN) {
if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
return tryMoveSelection(lm, 1);
} else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
return tryMoveSelection(lm, -1);
}
}
return false;
}
});
}
private boolean tryMoveSelection(RecyclerView.LayoutManager lm, int direction) {
int nextSelectItem = selectedItem + direction;
// If still within valid bounds, move the selection, notify to redraw, and scroll
if (nextSelectItem &gt;= 0 &amp;&amp; nextSelectItem &lt; getItemCount()) {
notifyItemChanged(selectedItem);
selectedItem = nextSelectItem;
notifyItemChanged(selectedItem);
lm.scrollToPosition(selectedItem);
return true;
}
return false;
}
@Override
public void onBindViewHolder(VH viewHolder, int position) {
// Set selected state; use a state list drawable to style the view
viewHolder.itemView.setSelected(selectedItem == position);
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View itemView) {
super(itemView);
// Handle item click and set the selection
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Redraw the old selection and the new
notifyItemChanged(selectedItem);
selectedItem = mRecyclerView.getChildPosition(v);
notifyItemChanged(selectedItem);
}
});
}
}
}