findViewByID（R.layout.skeleton_activity）返回null [英] findViewByID(R.layout.skeleton_activity) returns null

问题描述

我想在一个骨架应用程序的OnCreate（）注册的上下文菜单：

  / **与第一次创建活动调用。 * /
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;    //从XML布局描述充气我们的UI。
    的setContentView（R.layout.skeleton_activity）;    视图V = findViewById（R.layout.skeleton_activity）;
    registerForContextMenu（五）;    //查找布局中的文本编辑器视图，因为我们
    //想要做的各种事情编程用它。
    mEditor =（EditText上）findViewById（R.id.editor）;    //挂钩按钮presses到相应的事件处理程序。
    （（按钮）findViewById（R.id.back））setOnClickListener（mBackListener）。
    （（按钮）findViewById（R.id.clear））setOnClickListener（mClearListener）。    mEditor.setText（的getText（R.string.main_label））;
}
 

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

@CommonsWare解决了类似的帖子是要等到onFinishInflate（）。然而，在<一href=\"https://github.com/commonsguy/cw-advandroid/blob/master/Animation/SlidingPanel/src/com/commonsware/android/anim/SlidingPanelDemo.java\"相对=nofollow>示例项目他提供了，它似乎并不认为他会等到onFinishInflate。

我的问题：

1. 可以registerForContextMenu（）等
   直到onFinishInflate（）？


2. 如果是这样，我怎么办呢？

解决方案

这行没有纠正其要求ID和你提供的布局

 视图V = findViewById（R.layout.skeleton_activity）;
 

相反，如果你想有你的根布局元素的对象，然后提供它的一些ID，然后尝试这样的事情

 视图V = findViewById（R.id.root_element）;
 

I am trying to register a context menu in a skeleton app's OnCreate():

/** 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));
}

The debugger tells me that findViewById(R.layout.skeleton_activity) returns null.

@CommonsWare solution to a similar post is to Wait until onFinishInflate(). However, in the sample project he provides, it doesn't seem that he waits until onFinishInflate.

My questions:

1. Can registerForContextMenu() wait until onFinishInflate()?
2. If so, how do I do so?

解决方案

This line is not correct its asking for id and you are providing layout

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

Instead if you want to have object of your root layout element then provide it some id and then try something like this

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

这篇关于findViewByID（R.layout.skeleton_activity）返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！