Question

这是我的discussion.java，其中包含RecyclerView

public class Discussion extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_discussion);
        RecyclerView mRecycleview =(RecyclerView)findViewById(R.id.cycleview);
        mRecycleview.setLayoutManager(new LinearLayoutManager(this));
        String[] use ={"a","b"};
        String[] lo={"be","ndls"};
        String[] ti={"12:00","11:00"};
        String[] staus={"Today","Tommmorow"};
        int[] posimg={R.drawable.img_post1,R.drawable.img_post2};

        mRecycleview.setAdapter(new FeedAdapter(use,lo,ti,staus,posimg));
        @NonNull
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Open Activity for posting", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        // Functionality for poll
    }
}

这是我FeedAdapter的{{1}}，它是从资源布局文件RecyclerView中提取的。

content.xml

这是我的public class FeedAdapter extends RecyclerView.Adapter<FeedAdapter.FeedViewHolder> { private String[] userdata; private String[] locdata; private String[] timedata; private int[] postdata; private String[] statusdata; public FeedAdapter(String[] userdata,String[] locdata,String[] timedata,String[] statusdata,int[] postdata){ this.userdata=userdata; this.locdata=locdata; this.postdata=postdata; this.statusdata=statusdata; this.timedata=timedata; } @Override public FeedViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { LayoutInflater inflater=LayoutInflater.from(parent.getContext()); View view =inflater.inflate(R.layout.backupofcontent,parent,false); return new FeedViewHolder(view); } @Override public void onBindViewHolder( FeedAdapter.FeedViewHolder holder, int position) { String user=userdata[position]; String loc=locdata[position]; String time=timedata[position]; String status=statusdata[position]; int post=postdata[position]; holder.username.setText(user); holder.locationa.setText(loc); holder.timea.setText(time); holder.statusa.setText(status); if(post==0) holder.postimg.setVisibility(View.GONE); else holder.postimg.setImageResource(post); } @Override public int getItemCount() { return userdata.length; } public class FeedViewHolder extends RecyclerView.ViewHolder{ ImageView postimg; TextView username; TextView locationa; TextView timea; TextView statusa; public FeedViewHolder(View itemView) { super(itemView); postimg=itemView.findViewById(R.id.imgView_postPic); username=itemView.findViewById(R.id.user_name); locationa=itemView.findViewById(R.id.Location); timea=itemView.findViewById(R.id.Time); statusa=itemView.findViewById(R.id.post_text); } } }，适配器从中获取数据。我想在视图content.xml或onClickListner上设置id:likelayout"，以便在单击该视图时执行一些操作。现在，干一杯就足够了。

请帮助我完成操作。

like

Answer 1

在您的onBindViewHolder函数中，只需添加如下所示的点击监听器即可。

@Override
public void onBindViewHolder( FeedAdapter.FeedViewHolder holder, int position) {
    String user=userdata[position];
    String loc=locdata[position];
    String time=timedata[position];
    String status=statusdata[position];
    int post=postdata[position];
    holder.username.setText(user);
    holder.locationa.setText(loc);
    holder.timea.setText(time);
    holder.statusa.setText(status);

    if(post==0)
        holder.postimg.setVisibility(View.GONE);
    else
        holder.postimg.setImageResource(post);

    holder.username.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
            // Do something. 
        }
    });
}

如果您想为列表项中的其他UI元素设置点击侦听器，则只需像声明username，timea，statusa等的方式声明它们即可。然后将侦听器添加到它。

请记住，为了使ImageView可点击，您需要在布局文件中将clickable属性添加到true中。例如，如果您需要使自己的图片可点击，则需要添加clickable属性，如下所示。

<ImageView
    android:id="@+id/like_image"
    android:layout_width="25dp"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:src="@drawable/like"/>

为了在单击项目时显示Toast，在创建适配器时，您需要具有Context活动的Discussion。因此，我建议您像下面那样修改适配器的构造函数。

public class FeedAdapter extends 
    RecyclerView.Adapter<FeedAdapter.FeedViewHolder> {

    private  String[] userdata;
    private  String[] locdata;
    private  String[] timedata;
    private  int[]   postdata;
    private  String[] statusdata;

    // Add another extra variable to store context
    // The context is necessary for showing toast
    private Context context; 

    public  FeedAdapter(String[] userdata, String[] locdata,String[] timedata, String[] statusdata, int[] postdata, Context context){
        this.userdata = userdata;
        this.locdata = locdata;
        this.postdata = postdata;
        this.statusdata = statusdata;
        this.timedata = timedata;
        this.context = context; // Initialize it here
    }

    @Override
    public FeedViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater=LayoutInflater.from(parent.getContext());
        View view =inflater.inflate(R.layout.backupofcontent,parent,false);
        return new FeedViewHolder(view);
    }

    @Override
    public void onBindViewHolder( FeedAdapter.FeedViewHolder holder, int position) {
        String user=userdata[position];
        String loc=locdata[position];
        String time=timedata[position];
        String status=statusdata[position];
        int post=postdata[position];
        holder.username.setText(user);
        holder.locationa.setText(loc);
        holder.timea.setText(time);
        holder.statusa.setText(status);

        if(post==0)
            holder.postimg.setVisibility(View.GONE);
        else
            holder.postimg.setImageResource(post);

        // Use the context here to show the Toast 
        holder.username.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, "Something", Toast.LENGTH_LOGN).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return userdata.length;
    }

    public class FeedViewHolder extends RecyclerView.ViewHolder{

        ImageView postimg;
        TextView username;
        TextView locationa;
        TextView timea;
        TextView statusa;

        public FeedViewHolder(View itemView) {
            super(itemView);
            postimg=itemView.findViewById(R.id.imgView_postPic);
            username=itemView.findViewById(R.id.user_name);
            locationa=itemView.findViewById(R.id.Location);
            timea=itemView.findViewById(R.id.Time);
            statusa=itemView.findViewById(R.id.post_text);
        }
    }
}

要采用修改后的构造函数的更改，需要像从Discussion类中进行以下初始化那样来对适配器进行初始化。

mRecycleview.setAdapter(new FeedAdapter(use, lo, ti, staus, posimg, this));

希望有帮助！

Answer 2

与其他视图相同，在FeedViewHolder类中添加一个LinearLayout变量：

LinearLayout like;

然后

like = itemView.findViewById(R.id.likelayout);

然后在onBindViewHolder中使用：

holder.like.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                // Like Layout was clicked
            }
        });

如何将点击侦听器添加到Recycler View的子级？

2 个答案: