0

如何从“OtherClass”中获取“somevariable”的值？正如我在下面尝试的那样，我可以/应该使用 Activity 的上下文吗？

public class ParentActivity extends Activity {
  //This variable is reused by multiple Activities inheriting form this class
  protected static String somevariable = "text";   
  ...
}

public class MyActivity extends ParentActivity {
  @Override
  public void onCreate(Bundle icicle) {
  super.onCreate(icicle);
  myObject = new OtherClass(this);
  myObject.doSomething();
  ...
  }

...
}

public class OtherClass(){
  private Context c;
  private String b;

  OtherClass(Context context) {
    c = context;
  }

    doSomething() {
        // This does NOT work. 
        // How can I get somevariable from the ParentActivity????
        b = c.somevariable;   
    }
}
4

3 回答 3

2

如果您想访问somevariable类中定义的特定内容，ParentActivity那么您应该尝试访问它，ParentActivity.somevariable因为它已被声明static：

public class OtherClass { // Why were there extra parentheses ()
  private Context c;
  private String b;

  OtherClass(Context context) {
    c = context;
  }

  doSomething(){
  b = ParentActivity.somevariable; // Try this at home ;)
  }

}
于 2012-09-23T12:43:00.510 回答
0

您可以像这样传递变量：

public void doSomething(String someVariable){
  b = someVariable;   
}
于 2012-09-23T12:30:27.043 回答
0 
a = ParentActivity.somevarible;

那应该工作。

于 2012-09-23T12:36:34.637 回答