java - 如何使用 Firebase 搜索查询结果项实现 OnClick 项

Question

我创建了一个 firebase 搜索查询，它运行良好。但现在我似乎无法弄清楚如何进行 onlick 并获取项目位置。以下是我的 Firebase 搜索活动：

mUserDatabase=FirebaseDatabase.getInstance().getReference("Users").child("UserProfile";
        mSearchField = findViewById(R.id.search_field);
        mSearchBtn = findViewById(R.id.search_btn);
        mResultList = findViewById(R.id.result_list);
        mResultList.setHasFixedSize(true);
        mResultList.setLayoutManager(new LinearLayoutManager(this));
        mSearchBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String searchText = mSearchField.getText().toString();
                firebaseUserSearch(searchText);
            }
        });
    }
    private void firebaseUserSearch(String searchText) {
        Toast.makeText(SearchActivity.this, "Searching......", Toast.LENGTH_LONG).show();

        Query firebaseSearchQuery = mUserDatabase.orderByChild("profession").startAt(searchText).endAt(searchText + "\uf8ff");

        FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
                Users.class,
                R.layout.search_list_layout,
                UsersViewHolder.class,
                firebaseSearchQuery
        ) {
            @Override
            protected void populateViewHolder(UsersViewHolder viewHolder, Users model, int position) {

                viewHolder.setDetails(getApplicationContext(), model.getUsername(), model.getSummary(), model.getImageurl());
            }
        };
        mResultList.setAdapter(firebaseRecyclerAdapter);
    }
    public static class UsersViewHolder extends RecyclerView.ViewHolder {
        View mView;
        private TextView user_name;
        private TextView user_summary;
        private ImageView user_image;
        public UsersViewHolder(View itemView) {
            super(itemView);
            mView = itemView;
        }

        public void setDetails(Context ctx, String userName,String userSummary,String userImage){
            user_name = mView.findViewById(R.id.name_text);
             user_summary = mView.findViewById(R.id.summary_text);
            user_image = mView.findViewById(R.id.profile_image);
            user_name.setText(userName);
            user_summary.setText(userSummary);
            Glide.with(ctx).load(userImage).into(user_image);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int pos = getAdapterPosition();
                    Snackbar.make(v, "Hello,How may i help you", Snackbar.LENGTH_LONG).setAction("Action", null).show();
                }
            });
        }

单击搜索结果中的单个项目时，如何在详细信息活动中显示内容。

根据Parag Pawar 的建议，我尝试了以下方法，但它不起作用>

       @Override
        protected void populateViewHolder(UsersViewHolder viewHolder, Users model, int position) {

            viewHolder.setDetails(getApplicationContext(), model.getUsername(), model.getSummary(), model.getImageurl());
            final String each_key = getRef(position).getKey();


        }

    };

然后在我的 UserViewHolder 中，我初始化了 onclick：

  mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent pDetail = new Intent(SearchActivity.this, ProfileDetail.class);
                Users each_key = each_key.get(getAdapterPosition());
                pDetail.putExtra(ProfileDetail.EXTRA_POSITION, each_key.getUserId());
                startActivity(pDetail);


            }
        });

但我收到错误变量 each_key 可能尚未初始化

根据Parag Pawar的最高建议修复了我的错误，并在 populateView`holder 中实现了他的 onclick，如下所示：

 viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    /*Here use intent.putExtra() to send each_key on other activity and fetch data there*/
                    Toast.makeText(SearchActivity.this, "u clicked......" +position, Toast.LENGTH_LONG).show();
                    Intent each_key = new Intent(SearchActivity.this, ProfileDetail.class);
                    Users user = mResultList.get(position);
                    each_key.putExtra(ProfileDetail.EXTRA_POSITION, user.getUserId());
                    startActivity(each_key);



                } });

但我在这里收到错误：

 Users user = mResultList.get(position);

无法解析方法“get（int）”

mReultList 是我的 Recyclerview 的名称，我将其初始化如下：

private RecyclerView mResultList;     

但我不知道我这样做是否正确。我知道我应该将结果附加到适配器，但我不知道该怎么做。所以我尝试了：

  listItems = new ArrayList<>();
    firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<UsersList>(listItems,this);

但这似乎也不起作用

更新代码

我创建了一个数组：

 private List<UsersList> listItems;//UsersList is my modal class

然后将其添加到我的 onCreate 中：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_search);
    listItems = new ArrayList<>();

然后我使用这个数组按如下方式实现了 putExtra，如下所示：

Intent each_key = new Intent(TestSearch.this, ProfileDetail.class);
                    UsersList user = listItems.get(position);
                  //Here use intent.putExtra() to send each_key on other activity and fetch data there
                    Toast.makeText(TestSearch.this, "u clicked......" +position, Toast.LENGTH_LONG).show();
                    each_key.putExtra(ProfileDetail.EXTRA_POSITION, user.getUserId());
                    startActivity(each_key);

但是当我单击一个项目时出现此错误：

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
                  at java.util.ArrayList.get(ArrayList.java:411)
                  at com.ecard.ecard.search.TestSearch$2$1.onClick(TestSearch.java:94)
                  at android.view.View.performClick(View.java:5637)
                  at android.view.View$PerformClick.run(View.java:22429)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6119)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

标签： javaandroidfirebasefirebase-realtime-database

Answer 1

要从每个项目中获取密钥，请在 populateViewholder 中执行示例：-

final String each_key = getRef(position).getKey();

要在每个项目上设置 Click Listeners，请在 populateViewholder 中执行

viewHolder.itemView.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
            /*Here use intent.putExtra() to send each_key on other activity and fetch data there*/

   } }); }