java 错误：无法从静态上下文中引用非静态方法“findViewById(int)”
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/25367060/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Error: Non-static method 'findViewById(int)' cannot be referenced from a static context
提问by Quack
I am using Android Studio (Beta), and while using this java code in 'onCreateView()', I get an error.
我正在使用 Android Studio（测试版），在“onCreateView()”中使用此 java 代码时，出现错误。
ListView listView = (ListView) findViewById(R.id.someListView);
This is the error:
这是错误：
Non-static method 'findViewById(int)' cannot be referenced from a static context
How do I fix this?
我该如何解决？
回答by laalto
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.
假设您在活动中有一个静态片段内部类：您正在尝试调用该活动findViewById()，而您不能在不包含对父项的引用的静态内部类中调用该活动。
In onCreateView()you need to call it on the root view you just inflated, e.g.
在onCreateView()您需要在刚刚膨胀的根视图上调用它，例如
ListView listView = (ListView) rootView.findViewById(R.id.someListView);
回答by Eran
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()不应该是静态方法（我假设您是在 Activity 类中定义它），所以您一定是做错了什么。
回答by live-love
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 AsyncTask 或任何其他类中使用它，则可以将活动作为参数传递给方法或构造函数，例如：
activity onCreate:
活动创建：
//Pass activity variable (this)
new Main2Activity.MyTask().execute(this);
class inside activity:
课内活动：
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);
}
回答by Nadeem Iqbal
@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 viewvariable to access xml ui things in oncreateView and getActivity().findViewById(...) to access other then onCreateView() Method.
你现在可以实现这个...使用视图变量访问 oncreateView 和 getActivity().findViewById(...) 中的 xml ui 东西来访问其他然后 onCreateView() 方法。
回答by Aravindh Gopi
Inside Activity class
活动类内部
static ListView listView;
listView = (ListView) this.findViewById(R.id.someListView);
OR
或者
to create inside fragmentClass(static)
在 fragmentClass(static) 内部创建
static ListView listView;
listView = (ListView) getActivity().findViewById(R.id.someListView);
