如何从 Java 中的另一个类获取变量？

How do I get a variable from another class in Java?

提问by GrilledCheese

How do I set selectedPlayer to the value of position from my other class?

如何将 selectedPlayer 设置为我其他类的位置值？

I've read a bunch of similar questions on here, but I keep running into conflicts with my variables and functions.

我在这里阅读了一堆类似的问题，但我一直在与我的变量和函数发生冲突。

ScoreList.java

成绩单.java

public class ScoreList extends Activity {

    Integer selectedPlayer = 0;
}

ScoreListAdapter.java

分数列表适配器.java

public class ScoreListAdapter extends ArrayAdapter<Score> {

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

        final OnClickListener lsScoreView = new OnClickListener() {
              @Override
                public void onClick(View v) {
                  //send position to main class here
              }
        };

    }
}

回答by Tony Chhabada

set selectedPlayer as static:

将 selectedPlayer 设置为静态：

public class ScoreList extends Activity {

  static Integer selectedPlayer = 0;
}

This way,You can refer selecterPlayer using class name as it does not belong to any object of the class.

这样，您可以使用类名引用 selecterPlayer，因为它不属于该类的任何对象。

ScoreListAdapter.java

分数列表适配器.java

    public class ScoreListAdapter extends ArrayAdapter<Score> {

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

            final OnClickListener lsScoreView = new OnClickListener() {
                  @Override
                    public void onClick(View v) {
                       ScoreList.selectedPlayer;//You can use selectedPlayer here
                  }
            };

        }
    }

回答by xagyg

Options...

选项...

1. Pass ScoreListin as a parameter to the ScoreListAdapterconstructor and set it as an instance variable that you can refer to in ScoreListAdapter.getView.

2. Pass ScoreListin as a parameter to the getViewmethod.

1. ScoreList作为参数传入ScoreListAdapter构造函数并将其设置为实例变量，您可以在 中引用ScoreListAdapter.getView。

2. ScoreList作为参数传入getView方法。