如何加載佈局並將其添加到Android中的其他佈局？

Question

我想加載一個佈局XML文件並將佈局廣告到當前的內容視圖。

所以，如果我得到這個佈局在這裏：

，如果我打了硬件搜索按鈕，然後我要顯示在屏幕頂部的搜索欄，如下所示：

基於this answer，我想是這樣的：

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); 
} 

搜索欄名爲search_bar.xml佈局文件。主要活動是R.layout.activity_main。 R.id.layout_main是RelativeLayout的編號，它是activity_main中的容器。

但我得到了錯誤膨脹類。

如何加載佈局並將其添加到當前加載的佈局？

Answer 1

我沒有看到你的代碼有一個明顯的問題。正如在評論中提到的，請在這裏發佈日誌。

我可以提出另一種方法嗎？您可以包含搜索欄（在主佈局中或使用include標籤），並將其可見性設置爲GONE，直到您需要顯示它。

Answer 2

我做了一些研究，並將幾個提示結合起來。
首先，我用LayoutInflater.from(Context)而不是Context.LAYOUT_INFLATER_SERVICE（雖然這似乎不是問題）。其次，我使用了onSearchRequest()方法。

這是結果：

/** 
* 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); 
}