Question

我在列表视图中显示一些团队成员。计划是让teamId获得最大步数。以下方法演示了我如何实现这一目标。

public void readLeagueMembers(JSONObject response){


    JSONArray teamsArray = null;
    try {
        teamsArray = response.getJSONArray("teams");
        for (int i = 0; i < teamsArray.length(); i++) {

            leagueMembers = new LeagueMembers();
            JSONObject team = teamsArray.getJSONObject(i);

            leagueMembers.setTeamId(team.getString("ID"));
            leagueMembers.setTeams(team.getString("team_name"));

            leagueMembers.setLeaguePoints(team.getString("team_points"));

            leagueMembersList.add(leagueMembers);
            listView.setAdapter(leagueAdapter);


            //String[] team_points = new String[]{leagueMembers.getLeaguePoints()};
            teamId = leagueMembersList.get(0).getTeamId();
            Log.d("teamId",teamId);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

你可以从那个方法中看到变量teamId（它是静态的），它存储了第一行的teamId，即645.

现在我将此值传递给另一个类CountDownTimer。

 public class CounterClass1 extends CountDownTimer {

    public CounterClass1(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
    }

    @Override
    public void onTick(long millisUntilFinished) {

        long seconds = millisUntilFinished / 1000;
        long minutes = seconds / 60;
        long hours = minutes / 60;
        long days = hours / 24;
        String time = days+"d"+ ":" + hours % 24+"h" + ":" + minutes % 60 +"m"+ ":" + seconds % 60+"s";

        diffDays.setText("League finishes in: " + time);

    }

    @Override
    public void onFinish() {

        diffDays.setText("League Finished");
        viewResults.setVisibility(View.VISIBLE);
        leagueInvitation.setVisibility(View.GONE);

         winnerId = League.teamId;
        Log.d("team id",winnerId);

        viewResults(leagueId, winnerId, results, username, password);

    }
}

如图所示，我从另一个类

中读取了静态变量teamId

winnerId = League.teamId;

并将其存储到名为winnerId的变量中。不幸的是，winsId从调试器读为null。有什么建议？当然这是一个Java问题而不是Android问题。

感谢。

Answer 1

首先，你的联盟适应者在哪里。哇你初始化它。第二件事你是在内部设置适配器是错误的。如果你在json数组中有更多的oblect，它会一次又一次地设置adpter。

对于团队ID，您可以创建一个单例类，并在实例变量中设置团队ID。并根据需要获取该ID。这是您需要的单个类的代码。

public class ReferenceWrapper {
private static ReferenceWrapper wrapper;
private int teamId;
private Context context;
private ReferenceWrapper(Context context) {
    this.context=context;
}

public static ReferenceWrapper getInstance(Context context) {
    if (wrapper == null) {
        wrapper = new ReferenceWrapper(context);
    }
    return wrapper;
}

public int getTeamId(int teamId) {
    return teamId;
}

public int setTeamId() {
    this.teamId=teamId;
}

}

从列表视图行读取值

1 个答案: