如何加载布局并将其添加到Android中的其他布局？

Question

我想加载一个布局XML文件并将布局广告到当前的内容视图。

所以，如果我得到这个布局在这里：

，如果我打了硬件搜索按钮，然后我要显示在屏幕顶部的搜索栏，如下所示：

基于this answer，我想是这样的：

MainActivity.java

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    LayoutInflater inflater = (LayoutInflater) getBaseContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View v = inflater.inflate(R.layout.search_bar, null); 

    ViewGroup layout = (ViewGroup) findViewById(R.id.layout_main); 
    layout.addView(v); 
} 

搜索栏名为search_bar.xml布局文件。主要活动是R.layout.activity_main。 R.id.layout_main是RelativeLayout的编号，它是activity_main中的容器。

但我得到了错误膨胀类。

如何加载布局并将其添加到当前加载的布局？

Answer 1

我没有看到你的代码有一个明显的问题。正如在评论中提到的，请在这里发布日志。

我可以提出另一种方法吗？您可以包含搜索栏（在主布局中或使用include标签），并将其可见性设置为GONE，直到您需要显示它。

Answer 2

我做了一些研究，并将几个提示结合起来。
首先，我用LayoutInflater.from(Context)而不是Context.LAYOUT_INFLATER_SERVICE（虽然这似乎不是问题）。其次，我使用了onSearchRequest()方法。

这是结果：

/** 
* Whether the search bar is visible or not. 
*/ 
private boolean searchState = false; 

/** 
* The View loaded from the search_bar.xml layout. 
*/ 
private View searchView; 

/** 
* This method is overridden from the Activity class, enabling you to define events when the hardware search button is pressed. 
* 
* @return Returns true if search launched, and false if activity blocks it. 
*/ 
public boolean onSearchRequested() { 
    // Toggle the search state. 
    this.searchState = !this.searchState; 
    // Find the main layout 
    ViewGroup viewGroup = (ViewGroup) findViewById(R.id.layout_main); 
    // If the search button is pressed and the state has been toggled on: 
    if (this.searchState) { 
     LayoutInflater factory = LayoutInflater.from(this.activity); 
     // Load the search_bar.xml layout file and save it to a class attribute for later use. 
     this.searchView = factory.inflate(R.layout.search_bar, null); 
     // Add the search_bar to the main layout (on position 0, so it will be at the top of the screen if the viewGroup is a vertically oriented LinearLayout). 
     viewGroup.addView(this.searchView, 0); 
    } 
    // Else, if the search state is false, we assume that it was on and the search_bar was loaded. Now we remove the search_bar from the main view. 
    else { 
     viewGroup.removeView(this.searchView); 
    } 
    return false; 
} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
}