java - 单击 Cardview 时如何显示另一个 Activity 的详细信息

Question

我遇到问题，如何根据 cardView 的位置显示其值？我感觉我好像缺少了一些东西。

这是我的代码

    @Override
    public void onBindViewHolder(AnnouncementViewHolder holder, int position) {
        AnnouncementModel announcement = announcementList.get(position);

        if (announcement.getImage()!=null && !announcement.getImage().isEmpty()){
            Picasso.get()
                    .load(announcement.getImage())
                    // To fit image into imageView
                    .fit()
                    // To prevent fade animation
                    .noFade()
                    .into(holder.imageView);
        }else{
            //Do nothing
        }

        holder.textViewDate.setText(announcement.getDate());
        holder.textViewTitle.setText(announcement.getTitle());
        holder.textViewExcerpt.setText(announcement.getExcerpt());

    }

    @Override
    public int getItemCount() {
        return announcementList.size();
    }

    class AnnouncementViewHolder extends RecyclerView.ViewHolder {

        TextView textViewTitle, textViewExcerpt,textViewDate;
        ImageView imageView;

        public AnnouncementViewHolder(View itemView) {
            super(itemView);

            textViewDate = itemView.findViewById(R.id.textAnnouncementDate);
            textViewTitle = itemView.findViewById(R.id.textAnnouncementDesc);
            textViewExcerpt = itemView.findViewById(R.id.textAnnouncementDesc);
            imageView = itemView.findViewById(R.id.AnnouncementImageView);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Context context = v.getContext();
                    Intent intent = new Intent(context, DetailActivityAnnouncement.class);
                    intent.putExtra(DetailActivity.EXTRA_POSITION, getAdapterPosition());
                    context.startActivity(intent);
                }
            });

        }
    }

我想在点击时向我的其他 Activity 显示 textViewDate 和 textViewTitle。

这是我的detailActivity

public class DetailActivity extends AppCompatActivity {


    public static final String EXTRA_POSITION = "position";
    AnnouncementModel model;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail_announcement);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        int postion = getIntent().getIntExtra(EXTRA_POSITION, 0);

        TextView announcementContent = (TextView) findViewById(R.id.textAnnouncementContext);
        TextView announcementDate = (TextView) findViewById(R.id.textAnnouncementDate);
        ImageView announcementImage = (ImageView) findViewById(R.id.AnnouncementImageView);
        TextView announcementOtherDetails = (TextView) findViewById(R.id.textAnnouncementOtherDetails);


    }

}

我觉得我已经接近我的答案，但我仍然陷入困境。任何帮助将不胜感激。

Answer 1

您可以使用 Intent 将数据从一个 Activity 发送到另一个 Activity 。

在您的 itemView.setOnClickListener() 中，您已经定义了打开 DetailActivity 的 Intent。

现在您需要做的就是按 Intent 添加数据，例如

Context context = v.getContext();
Intent intent = new Intent(context, DetailActivityAnnouncement.class);
intent.putExtra(DetailActivity.EXTRA_POSITION, getAdapterPosition());

// putExtra can be used to send data with intent, here "date"
// and "title" is key that we will need later to access these values 
intent.putExtra("date",announcementList.get(getAdapterPosition()).getDate());
intent.putExtra("title", announcementList.get(getAdapterPosition()).getTitle());

context.startActivity(intent);

在您的 DetailActivity 中，您可以在 onCreate 方法中检索此信息

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail_announcement);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        int postion = getIntent().getIntExtra(EXTRA_POSITION, 0);

        //you can retrieve data from intent like
        String textViewDate = getIntent().getStringExtra("date");
        String textViewTitle = getIntent().getStringExtra("title");

        TextView announcementContent = (TextView) findViewById(R.id.textAnnouncementContext);
        TextView announcementDate = (TextView) findViewById(R.id.textAnnouncementDate);
        ImageView announcementImage = (ImageView) findViewById(R.id.AnnouncementImageView);
        TextView announcementOtherDetails = (TextView) findViewById(R.id.textAnnouncementOtherDetails);


    }

额外:-您应该始终检查是否已收到来自 Intent 的数据，并确保 textViewDate、textViewTitle 不为空。

您还可以在检索 Activity 中的数据之前进行检查，例如 if(getIntent().hasExtra("date")) 如果您有数据，那么它就是 true。