Question

我有这段代码

filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    public void onNothingSelected(AdapterView<?> parent) {
    }
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        int throwid = (int)id;  
        System.out.println( "from onItemselected" +throwid);
    }
});

我尝试获取throwid变量的值，因此我创建了一个全局变量themerowid，我这样做：

themerowid = throwid;

但我有这个错误：

throwid无法解析为变量

如何获得throwid价值？

问题是throwid没有改变值，它总是返回0，我想那个孔代码：

filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    public void onNothingSelected(AdapterView<?> parent) {
    }
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
           throwid = (int)id;  
          System.out.println( "from onItemselected" +throwid);
    }
});

没有被执行，这就是我一直得到0的原因，这段代码中有一个错误。

Answer 1

看起来thowid不在可见范围内。试试这个：

    filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
        public void onNothingSelected(AdapterView<?> parent) {
        }
        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
              themerowid = (int)id;  
              System.out.println( "from onItemselected" + id);
        }
    });

Answer 2

    public YOURActivty extend Activty{
    int themerowid;  //<--------------------



      public void onCreate(Bundle savedInstanceState) {
      ...

    }


 public void xYZ() {

    filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
                    public void onNothingSelected(AdapterView<?> parent) {
                    }
                    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                            int throwid = (int)id;  
                          System.out.println( "from onItemselected" +throwid);
                    }
                });

    }
}

Answer 3

全局宣告throwid .....然后使用它......

   int throwid
  filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
        public void onNothingSelected(AdapterView<?> parent) {
        }
        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                throwid = (int)id;  
              System.out.println( "from onItemselected" +throwid);
        }
    });

Answer 4

filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onNothingSelected(AdapterView<?> parent) {
            }
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                    throwid = (int)id;  
                  System.out.println( "from onItemselected" +throwid);
            }
        });

Answer 5

尝试这种方式：

public class testingActivity extends Activity 
{

public int throwid;
 /** Called when the activity is first created. */

@Override      
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
  ////YOUR CODE...
          filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onNothingSelected(AdapterView<?> parent) {
            }
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                     throwid = (int)id;  
                  System.out.println( "from onItemselected" +throwid);
            }
        });
}

}

Answer 6

在匿名类（侦听器）之外定义throwId，如下所示：

public class MyClass extends ... implements ... {
    ...
    ...
    int throwId;

    filethemeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
        public void onNothingSelected(AdapterView<?> parent) {}

        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
            throwId = (int)id;  
            System.out.println( "from onItemselected" +throwid);
        }
    });
}

无法解析为变量

6 个答案: