Question

我正在尝试创建一个简单的Android应用程序，我遇到了一个我不确定如何修复的问题。我是Android和Java的新手，所以如果你能提供帮助，我们将不胜感激。

这是我的代码：

public class arraylist extends ListActivity {

ArrayList<Team> teams = new ArrayList<Team>();

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Creating the array list
    teams.add(new Team("Everton ", "everton", "Liverpool", "1878", "Jagielka", "Premier League"));
    teams.add(new Team("Arsenal ", "arsenal", "London", "1886", "Arteta", "Premier League"));
    teams.add(new Team("Manchester United ", "manutd", "Manchester", "1878", "Rooney", "Premier League"));
    teams.add(new Team("Leeds United ", "leedsutd", "Leeds", "1919", "Cooper", "Championship"));
    CustomAdapter custAdapter = new CustomAdapter(this, teams);
    setListAdapter(custAdapter);
    registerForContextMenu(getListView());
}

protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    Team t = teams.get(position);
    Toast.makeText(this, t.getTeamName() + "are a team from " + t.getLocation() + ".", Toast.LENGTH_SHORT).show();
}


public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo main) {
    super.onCreateContextMenu(menu, v, main);
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main, menu);
}



public boolean onContextItemSelected(MenuItem item) {
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
    String itemTitle = (String) item.getTitle();
    switch (item.getItemId()) {
    case R.id.year:
        Toast.makeText(this, teams.getTeamName() + " were created in " + teams.getYear() + ".", Toast.LENGTH_SHORT).show();
        return true;
    case R.id.captain:
        Toast.makeText(this, teams.getCaptain() + " is the current captain of " + teams.getTeamName() + ".", Toast.LENGTH_SHORT).show();
        return true;
    case R.id.league:
        Toast.makeText(this, teams.getTeamName() + "are currently in the " + teams.getLeague() + ".", Toast.LENGTH_SHORT).show();
        return true;
    }
    return super.onContextItemSelected(item);
}
}

这是我的Team.java：

public class Team {
private String teamName;
private String imageName;
private String location;
private String year;
private String captain;
private String league;

Team (String teamName, String imageName, String location, String year, String captain, String league) {
    this.teamName = teamName;
    this.imageName = imageName;
    this.location = location;
    this.year = year;
    this.captain = captain;
    this.league = league;
}

public void setTeamName(String teamName) {
    this.teamName = teamName;
}
public void setImageName(String imageName) {
    this.imageName = imageName;
}
public void setLocation(String location) {
    this.location = location;
}
public void setYear(String year) {
    this.year = year;
}
public void setCaptain(String captain) {
    this.captain = captain;
}
public void setLeague(String league) {
    this.league = league;
}

public String getTeamName() {
    return teamName;
}
public String getImageName() {
    return imageName;
}
public String getLocation() {
    return location;
}
public String getYear() {
    return year;
}
public String getCaptain() {
    return captain;
}
public String getLeague() {
    return league;
}

}

我在这里收到一条错误，说“方法getTeamName（）未定义类型ArrayList”我还试着从ArrayList调用这个：

    Toast.makeText(this, teams.getTeamName() + " were created in " + teams.getYear() + ".", Toast.LENGTH_SHORT).show();
        return true;
    case R.id.captain:
        Toast.makeText(this, teams.getCaptain() + " is the current captain of " + teams.getTeamName() + ".", Toast.LENGTH_SHORT).show();
        return true;
    case R.id.league:
        Toast.makeText(this, teams.getTeamName() + "are currently in the " + teams.getLeague() + ".", Toast.LENGTH_SHORT).show();
        return true;

任何提示或帮助？如果这是一个简单的修复，我很抱歉，我没有长时间使用Java。

谢谢， DOM

Answer 1

这是错误的：

teams.getTeamName()

getTeamName()是Team的方法，而不是ArrayList<Team>的方法。

应该是

teams.get(i).getTeamName()

对于i和0之间的某些teams.size()-1，

。

同样适用于teams.getCaptain()，teams.getLeague()等......

方法getTeamName（）未定义类型ArrayList <team> - 错误代码，Java </team>

1 个答案: