错误:不能从静态上下文中引用非静态方法“findViewById(int)”

I am using Android Studio (Beta), and while using this java code in 'onCreateView()', I get an error.

我使用的是Android Studio (Beta)，在“onCreateView()”中使用这个java代码时，我得到了一个错误。

ListView listView = (ListView) findViewById(R.id.someListView);

This is the error:

这是错误的:

Non-static method 'findViewById(int)' cannot be referenced from a static context

How do I fix this?

我怎么修复这个?

5 个解决方案

#1

Assuming you have a static fragment inner class inside an activity: you're trying to call the activity's findViewById() which you cannot in a static inner class that doesn't hold a reference to the parent.

假设您在一个活动中有一个静态片段内部类:您正在尝试调用活动的findViewById()，而在一个不包含父类引用的静态内部类中，您不能调用它。

In onCreateView() you need to call it on the root view you just inflated, e.g.

在onCreateView()中，你需要在你刚刚膨胀的根视图中调用它。

 ListView listView = (ListView) rootView.findViewById(R.id.someListView);

#2

onCreateView() shouldn't be a static method (I'm assuming you are defining it within an Activity class), so you must be doing something wrong.

onCreateView()不应该是一个静态方法(我假设您在活动类中定义它)，所以您一定做错了什么。

#3

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.frag_layout, container, false);
    ListView listView = (ListView) view.findViewById(R.id.listviewID);
    context = getActivity();
    return view;
}

You can implement this now... Use view variable to access xml ui things in oncreateView and getActivity().findViewById(...) to access other then onCreateView() Method.

您现在可以实现这个……使用视图变量访问oncreateView和getActivity(). findviewbyid(…)来访问其他oncreateView()方法。

#4

Inside Activity class

在Activity类

 static ListView listView;
 listView = (ListView) this.findViewById(R.id.someListView);

或

to create inside fragmentClass(static)

创建内部fragmentClass(静态)

  static ListView listView;
  listView = (ListView) getActivity().findViewById(R.id.someListView);

#5

If you are using it in an static AsyncTask, or any other class, you can pass the activity as a parameter to a method or constructor, for example:

如果您在静态异步任务或任何其他类中使用它，您可以将活动作为参数传递给方法或构造函数，例如:

activity onCreate:

活动onCreate:

//Pass activity variable (this)
new Main2Activity.MyTask().execute(this);

class inside activity:

内部类活动:

private static class MyTask extends AsyncTask<Object, Void, String> {

        Main2Activity activity;

        @Override
        protected String doInBackground(Object... params) {
            activity = (Main2Activity)params[0];
            ....
        }

        @Override
        protected void onPostExecute(String str) {
            // Use parameter activity passed to class
            WebView webView = activity.findViewById(R.id.web_view);
            webView.loadData(str, "text/html; charset=UTF-8", null);
        }

#1