Java 选择RecyclerView列表项后的启用按钮
我有一个带有RecyclerView和一个按钮的活动,该按钮一开始被禁用。RV的元素是可选择的,我希望按钮仅在选择元素后启用。我试图在recyclerview上设置addOnItemTouchListener,问题是在滚动列表时也会调用它 这是我的适配器:Java 选择RecyclerView列表项后的启用按钮,java,android,android-recyclerview,Java,Android,Android Recyclerview,我有一个带有RecyclerView和一个按钮的活动,该按钮一开始被禁用。RV的元素是可选择的,我希望按钮仅在选择元素后启用。我试图在recyclerview上设置addOnItemTouchListener,问题是在滚动列表时也会调用它 这是我的适配器: public class CLusterListAdapter extends RecyclerView.Adapter<CLusterListAdapter.ClusterListViewHolder> { private
public class CLusterListAdapter extends RecyclerView.Adapter<CLusterListAdapter.ClusterListViewHolder> {
private ArrayList<ClusterItem> mListOfClusters;
private OnItemClickListener mListener;
//index
int row_index = -1; //Default no row chosen
public interface OnItemClickListener{
//delete
void onDeleteCluster(int position);
//edit
void onEditCluster(int position);
//select
void onClick(View view, int position);
}
public void setOnItemClickListener(OnItemClickListener listener){mListener = listener;}
public static class ClusterListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView mClusterName;
public TextView mClusterMembers;
public ImageView mDeleteCluster;
public ImageView mEditCluster;
//This
private OnItemClickListener itemClickListener;
public void setItemClickListener(OnItemClickListener listener){
this.itemClickListener = listener;
}
public ClusterListViewHolder(@NonNull View itemView, final OnItemClickListener listener) {
super(itemView);
mClusterName = itemView.findViewById(R.id.tv_clusters_name_cluster_list);
mClusterMembers = itemView.findViewById(R.id.tv_clusters_members_cluster_list);
mDeleteCluster = itemView.findViewById(R.id.iv_delete_cluster);
mEditCluster = itemView.findViewById(R.id.iv_edit_cluster);
mDeleteCluster.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(listener != null){
int position = getAdapterPosition();
if(position != RecyclerView.NO_POSITION){
listener.onDeleteCluster(position);
}
}
}
});
mEditCluster.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(listener != null){
int position = getAdapterPosition();
if(position != RecyclerView.NO_POSITION){
listener.onEditCluster(position);
}
}
}
});
//used for highlighting item
itemView.setOnClickListener(this);
}
//This
@Override
public void onClick(View v) {
itemClickListener.onClick(v, getAdapterPosition());
}
}
public CLusterListAdapter(ArrayList<ClusterItem> listOfClusters ){ mListOfClusters = listOfClusters;}
@NonNull
@Override
public ClusterListViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.chose_your_cluster_list_item, viewGroup, false);
ClusterListViewHolder clusterListViewHolder = new ClusterListViewHolder(view, mListener);
return clusterListViewHolder;
}
@Override
public void onBindViewHolder(@NonNull ClusterListViewHolder clusterListViewHolder, int i) {
ClusterItem currentCluster = mListOfClusters.get(i);
clusterListViewHolder.mClusterName.setText(currentCluster.getClustersName());
clusterListViewHolder.mClusterMembers.setText(currentCluster.getClustersMembers());
clusterListViewHolder.mClusterMembers.setSelected(true);
clusterListViewHolder.setItemClickListener(new OnItemClickListener() {
@Override
public void onDeleteCluster(int position) {
//nothing here
}
@Override
public void onEditCluster(int position) {
//nothing here
}
@Override
public void onClick(View view, int position) {
//Select a certain item
row_index = position; //Set row index to selected position
SpTAGs.currentItem = mListOfClusters.get(position); //Set current item is item selection
notifyDataSetChanged(); //Made effect on RecyclerView's Adapter
SpTAGs.selectedClusterPosition = position;
}
});
//Set highlight color
if(row_index == i) {
clusterListViewHolder.itemView.setBackgroundColor(Color.parseColor("#E64A19"));
}else {
clusterListViewHolder.itemView.setBackgroundColor(Color.parseColor("#FFFFFF"));
}
}
@Override
public int getItemCount() {
return mListOfClusters.size();
}
你知道怎么得到这个吗?谢谢大家! 从适配器回调到活动。在那里启用您的按钮
public class CLusterListAdapter extends RecyclerView.Adapter<CLusterListAdapter.ClusterListViewHolder> {
...
interface Listener {
void onItemClick(int position);
}
}
在活动中:
clusterRecyclerView.addOnItemTouchListener( ... );
clusterRecyclerView.setListener((int position) -> {
// logic to enable button goes here
});
您不需要在此处使用addOnItemTouchListener。 只需在活动中创建一个方法,如下所示
public void VisibleButton(){
yourButton.setVisibility(View.VISIBLE);
/**....*/
}
((YourActivityName)your_ACtivity_Context).VisibleButton();
打电话给methode
VisibleButton()
从适配器,从您希望按钮可见的位置,如下所示
public void VisibleButton(){
yourButton.setVisibility(View.VISIBLE);
/**....*/
}
((YourActivityName)your_ACtivity_Context).VisibleButton();
创建自己的界面,并在选择和取消选择列表时使用它们,并在“活动”和“回收”视图之间进行通信。