如何在另一个 activity 中显示点击的列表视图项目

Question

我无法使用 setOnItemClickListener 方法在另一个 activity 中显示适当的 listItem。我用 Firebase 来做这个。我有 3 个变量（字符串）：姓名，Phone，电子邮件

我在 MainActivity 中的代码片段：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                ChatMessage selectedList = adapter.getItem(position);
                if(selectedList != null) {

                    Intent intent = new Intent(MainActivity.this, MainDetails.class);
                    long listId = adapter.getItemId(position);
                    intent.putExtra(Constants.KEY_LIST_ID, listId);
                    startActivity(intent);
                }
            }
        });

KEY_LIST_ID 在 Constants.class:

public static final String KEY_LIST_ID = "LIST_ID";

需要这个KEY_LIST_ID来保存每个itemId？

聊天适配器：

public class ChatAdapter extends ArrayAdapter<ChatMessage> {

    public ChatAdapter(Context context, int resource) {
        super(context, resource);

    }

    @Override
    public ChatMessage getItem(int position) {
        return super.getItem(getCount() - 1 - position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;


        if(convertView==null){
            LayoutInflater inflater = ((Activity) getContext()).getLayoutInflater();
            convertView = inflater.inflate(R.layout.list_item, parent, false);

            viewHolder = new ViewHolder();
            viewHolder.username = (TextView) convertView.findViewById(R.id.list_item_username);
            viewHolder.message = (TextView) convertView.findViewById(R.id.list_item_message);
            viewHolder.email = (TextView) convertView.findViewById(R.id.list_item_email);

            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }

        ChatMessage item = getItem(position);
        if(item != null) {
            viewHolder.username.setText(item.getName());
            viewHolder.message.setText(item.getPhone());
            viewHolder.email.setText(item.getEmail());
        }

        return convertView;
    }




    private static class ViewHolder{
        TextView username;
        TextView message;
        TextView email;
    }
}

MainDetails: Activity 应显示适当的 listItem:

private TextView detailsName, detailsPhone, detailsEmail;
    private ChatMessage chatMessage;
    private ListView listView;
    private ChatAdapter chatAdapter;
    private String listId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_details);

        detailsName = (TextView) findViewById(R.id.detsName);
        detailsPhone = (TextView) findViewById(R.id.detsText);
        detailsEmail = (TextView) findViewById(R.id.detsEmail);

        Intent intent = this.getIntent();
        listId = intent.getStringExtra(Constants.KEY_LIST_ID);



    }

现在，它在 MainDetails 中没有任何显示。

有人可以帮助我如何显示此 Activity 中的每个 ListItem 吗？

Answer 1

您将 listId 设为 long。所以使用：

long listId = intent.getLongExtra(Constants.KEY_LIST_ID, -1L);

编辑： 要获取用户名，phone 和电子邮件：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                ChatMessage selectedList = adapter.getItem(position);
                if(selectedList != null) {

                    Intent intent = new Intent(MainActivity.this, MainDetails.class);
                   // long listId = adapter.getItemId(position);

                        intent.putExtra(Constants.KEY_LIST_NAME, selectedList.getName());
                        intent.putExtra(Constants.KEY_LIST_PHONE, selectedList.getPhone());
                        intent.putExtra(Constants.KEY_LIST_EMAIL, selectedList.getEmail());
                        startActivity(intent);
                    }
            }
        });

在 MainDetails

        Intent intent = this.getIntent();
        name= intent.getStringExtra(Constants.KEY_LIST_NAME);
        phone= intent.getStringExtra(Constants.KEY_LIST_PHONE);
        email= intent.getStringExtra(Constants.KEY_LIST_EMAIL);

如何在另一个 activity 中显示点击的列表视图项目

How to display clicked listview item in another activity

java

android

firebase

firebase-realtime-database

onitemclicklistener