访问另一个类变量

Answer 1

如果座位是动态的（数据依赖于数据库），最简单的事情就是添加SharedPreferManager。你可以在YouTube上找到关于它的教程。

下面是我的例子：

YourActivity.java

public class YourActivity extends AppCompatActivity implements View.OnClickListener {
Context mContext;
String mySeat;

    //calling sharedpref class
SharedPrefManager sharedPrefManager;

@Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        setContentView(R.layout.youractivityxml);
        
        mContext = this;
        sharedPrefManager = new SharedPrefManager(this);
        
            //to get saved data use this
        sharedPrefManager.getSp_seats();
        
        ...
        
            //if you are going to change or to save something on your sharedpref use this
        String yourstring = "....";
        sharedPrefManager.savedatasp(SharedPrefManager.sp_seats, yourstring);
    }
}

public class SharedPrefManager {
 SharedPreferences sp;
 SharedPreferences.Editor speditor;
 
 //declaration
    public static final String sp_seats = "spseats";
    
 //saving string
    public void savedatasp(String keysp, String value) {
        speditor.putString(keysp, value);
        speditor.commit();
    }
    
 //saving bolean
    public void savebooleansp(String keysp, boolean value) {
        speditor.putBoolean(keysp, value);
        speditor.commit();
    }

 //get data
    public String getSp_seats() {
        return sp.getString(sp_seats, "null");
    }
}