android - findViewByID(R.layout.skeleton_activity) 返回 null

Question

我正在尝试在骨架应用程序的 OnCreate() 中注册上下文菜单:

/** Called with the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Inflate our UI from its XML layout description.
    setContentView(R.layout.skeleton_activity);

    View v = findViewById(R.layout.skeleton_activity);
    registerForContextMenu(v);      

    // Find the text editor view inside the layout, because we
    // want to do various programmatic things with it.
    mEditor = (EditText) findViewById(R.id.editor);

    // Hook up button presses to the appropriate event handler.
    ((Button) findViewById(R.id.back)).setOnClickListener(mBackListener);
    ((Button) findViewById(R.id.clear)).setOnClickListener(mClearListener);

    mEditor.setText(getText(R.string.main_label));
}

调试器告诉我 findViewById(R.layout.skeleton_activity) 返回 null。

@CommonsWare 对 similar post 的解决方案是等到 onFinishInflate()。然而，在 sample project他提供，似乎他并没有等到 onFinishInflate。

我的问题:

1. 可以registerForContextMenu()等待 直到 onFinishInflate()?
2. 如果可以，我该怎么做？

Answer 1

此行不正确，它要求提供 id 而您正在提供布局

View v = findViewById(R.layout.skeleton_activity);

相反，如果你想拥有你的根布局元素的对象，那么给它提供一些 id，然后尝试这样的事情

View v = findViewById(R.id.root_element);