Android Java - 将 JSON 的数组条目解析到 Recycler 视图中

Question

我正在尝试将 JSON 的块解析为 RecyclerView。到目前为止，我已经能够通过相当平坦的 JSON 结构来实现这一点。但是现在我的 JSON 文件中有一个数组条目，我总是想在其中获取第一个条目。 JSON 看起来像这样：

[    
    {
        "MatchID": 60989,
        "Team1": {
            "TeamName": "FC Bayern München",
            "TeamIconUrl": "https://i.imgur.com/jJEsJrj.png"
        },
        "Team2": {
            "TeamName": "VfL Wolfsburg",
            "TeamIconUrl": "https://i.imgur.com/ucqKV4B.png"
        },
        "MatchResults": [
            {
                "PointsTeam1": 4,
                "PointsTeam2": 0,
                "ResultOrderID": 1
            },
            {
                "PointsTeam1": 1,
                "PointsTeam2": 0,
                "ResultOrderID": 2
            }
        ]
    },
    {
        "MatchID": 60990,
        "Team1": {
            "TeamName": "VfL Bochum",
            "TeamIconUrl": "https://i.imgur.com/5jy3Gfr.png"
        },
        "Team2": {
            "TeamName": "1. FC Union Berlin",
            "TeamIconUrl": "https://upload.wikimedia.org/wikipedia/commons/4/44/1._FC_Union_Berlin_Logo.svg"
        },
        "MatchResults": [
            {
                "PointsTeam1": 0,
                "PointsTeam2": 1,
                "ResultOrderID": 1
            },
            {
                "PointsTeam1": 0,
                "PointsTeam2": 1,
                "ResultOrderID": 2
            }
        ]
    }
]

我的 Activity 使用 Retrofit2

从 API 中获取这个 JSON

    private void parseJson() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://www.openligadb.de/api/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        RequestInterface request = retrofit.create(RequestInterface.class);
        Call<List<Match>> call=request.getMatchJson();
        call.enqueue(new Callback<List<Match>>() {
            @Override
            public void onResponse(Call<List<Match>> call, Response<List<Match>> response) {
                if (response.isSuccessful() && response.body() != null) {
                    matchList = new ArrayList<>(response.body());
                    matchAdapter = new MatchAdapter(matchList, ActivityMatch.this);
                    mRecyclerView.setAdapter(matchAdapter);
                }
            }

            @Override
            public void onFailure(Call<List<Match>> call, Throwable t) {
                Log.println(Log.ERROR, "FAILED", String.valueOf(t));
                Toast.makeText(ActivityMatch.this, "Oops! Somehting went wrong!", Toast.LENGTH_SHORT).show();
            }
        });
    }

然后我的 MatchAdapter 正在为视图解析此数据。在这里，我想显示 MatchResults 中的第一个，然后使用 PointsTeam1 和 PointsTeam2 显示类似“4 : 0”

的内容

现在在我的模型中Class 访问像 TeamName 和 TeamIconUrl 这样的直接值是可行的，但我正在努力获取数组的第一个条目并且我真的不知道如何正确处理这个问题。

适配器Class:

public class MatchAdapter extends RecyclerView.Adapter<MatchAdapter.MatchHolder>{

    private ArrayList<Match> matchList;
    private Context context;

    public MatchAdapter(ArrayList<Match> matchList, Context context) {
        this.context = context;
        this.matchList = matchList;
    }

    @NonNull
    @Override
    public MatchAdapter.MatchHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.match_list_row_layout, viewGroup, false);
        return new MatchHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MatchAdapter.MatchHolder holder, int position) {
        holder.tvTeam1name.setText(matchList.get(position).Team1.TeamName);
        holder.tvTeam2name.setText(matchList.get(position).Team2.TeamName);
        Glide.with(context).load(matchList.get(position).Team1.TeamIconUrl).into(holder.ivTeam1Logo);
        Glide.with(context).load(matchList.get(position).Team2.TeamIconUrl).into(holder.ivTeam2Logo);
        //This is not working
        holder.tvResult.setText(matchList.get(position).MatchResults.PointsTeam1 + " : " + matchList.get(position).MatchResults.PointsTeam2);
    }

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

    public class MatchHolder extends RecyclerView.ViewHolder {
        private TextView tvTeam1name, tvTeam2name, tvResult;
        private ImageView ivTeam1Logo, ivTeam2Logo;

        public MatchHolder(@NonNull View itemView) {
            super(itemView);
            tvTeam1name = itemView.findViewById(R.id.tv_team1name);
            tvTeam2name = itemView.findViewById(R.id.tv_team2name);
            tvResult = itemView.findViewById(R.id.tv_result);
            ivTeam1Logo = itemView.findViewById(R.id.iv_team1logo);
            ivTeam2Logo = itemView.findViewById(R.id.iv_team2logo);
        }
    }
}

我的模型Class（为了便于阅读而省略 Getters/Setters）

package de.eahjena.app.wi.fussball;

public class Match {
    Team Team1;
    Team Team2;
    MatchResults MatchResults;

    public Match(Team Team1, Team Team2, MatchResults MatchResults) {
        this.Team1 = Team1;
        this.Team2 = Team2;
        this.MatchResults = MatchResults;
    }

}

class Team {
    String TeamName;
    String TeamIconUrl;

    public Team (String TeamName, String TeamIconUrl) {
        this.TeamName = TeamName;
        this.TeamIconUrl = TeamIconUrl;
    }
}

class MatchResults {
    String PointsTeam1;
    String PointsTeam2;

    public MatchResults(String PointsTeam1, String PointsTeam2) {
        this.PointsTeam1 = PointsTeam1;
        this.PointsTeam2 = PointsTeam2;
    }
}

Answer 1

根据您假设使用 List<MatchResults> MatchResults 的问题，因为 API 响应包含匹配结果列表。

进一步使用 matchResults 数组中的第一个位置，您可以在适配器中像这样使用它：

matchList.get(position).MatchResults.get(0).PointsTeam1

Android Java - 将 JSON 的数组条目解析到 Recycler 视图中

Android Java - Parse Array Entry of JSON into Recycler View

java

android

json

retrofit2