LayoutInflater.Factory onCreateView 不使用 22.1+ 支持库调用

Posted 2023-04-14

【中文标题】LayoutInflater.Factory onCreateView 不使用 22.1+ 支持库调用

【英文标题】：LayoutInflater.Factory onCreateView is not called with 22.1+ support library

【发布时间】：2015-12-03 17:18:15

【问题描述】：

我的LayoutInflater.Factory（下面的代码示例）调用onCreateView 并与“com.android.support:support-v4:22.0.0”一起正常工作的主要问题。但是当我移动到 'com.android.support:support-v4:22.1.0' 或更高版本时，不会调用 onCreateView。我不明白为什么？

//From many fragments i Call hintManager.inflate
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, Bundle savedInstanceState) 
    layout = hintManager.inflate(inflater, R.layout.generate_code);

...

//here is HintManager method called from various fragments. 
public View inflate(LayoutInflater inflater, int layoutResourceId) 
    AttributeParser attributeParser = new AttributeParser();
    LayoutInflater layoutInflater = attributeParser.getLayoutInflater(inflater);

    final View v = layoutInflater.inflate(layoutResourceId, null);
    //here AttributeParserFactory#onCreateView should be called, but it fails with 22.1+ support lib, but works with 22.0
    attributeParser.setViewAttribute(v);
    return v;
 

...

//example of factory, that works fine with 22.0 support lib
private Map<Integer, HashMap<Integer, String>> helpViewList;

private class AttributeParser 

    private AttributeParserFactory mFactory;

    private class AttributeParserFactory implements LayoutInflater.Factory
        @Override
        public View onCreateView(String name, Context context, AttributeSet attrs) 
            String id = attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "id");

            if(id != null)
                // String with the reference character "@", so we strip it to keep only the reference
                id = id.replace("@", "");

                TypedArray libraryStyledAttributeList = context.obtainStyledAttributes(attrs, R.styleable.Help);
                HashMap<Integer, String> libraryViewAttribute = new HashMap<Integer, String>();
                int i = 0;

                for(int attribute : R.styleable.Help)
                    String attributeValue = null;
                    if (attribute == R.styleable.Help_arrow || attribute == R.styleable.Help_padding) 
                        attributeValue = String.valueOf(libraryStyledAttributeList.getInteger(i, 0));
                    
                    else 
                        attributeValue = libraryStyledAttributeList.getString(i);
                    

                    if(attributeValue != null)
                        libraryViewAttribute.put(attribute, attributeValue);

                    i++;
                

                if(!libraryViewAttribute.isEmpty()) 
                    helpViewList.put(Integer.valueOf(id), libraryViewAttribute);
                

                libraryStyledAttributeList.recycle();
            

            return null;
        

    

    public AttributeParser()
        mFactory = new AttributeParserFactory();
    

    public void clear() 
        helpViewList.clear();
    

    public LayoutInflater getLayoutInflater(LayoutInflater inflater) 
        LayoutInflater layoutInflater = inflater.cloneInContext(inflater.getContext());
        layoutInflater.setFactory(mFactory);

        return layoutInflater;
    

    public void setFactory(LayoutInflater inflater)
        inflater.cloneInContext(inflater.getContext()).setFactory(mFactory);
    

    public void setViewAttribute(Activity activity) 
        for(Map.Entry<Integer, HashMap<Integer, String>> attribute : helpViewList.entrySet())
            if(activity.findViewById((Integer) attribute.getKey()) != null)
                activity.findViewById((Integer) attribute.getKey()).setTag(attribute.getValue());

    

    public void setViewAttribute(View view) 
        for(Map.Entry<Integer, HashMap<Integer, String>> attribute : helpViewList.entrySet())
            if(view.findViewById((Integer) attribute.getKey()) != null)
                view.findViewById((Integer) attribute.getKey()).setTag(attribute.getValue());
    

    public Map<Integer, HashMap<Integer, String>> getAttributeList() 
        return helpViewList;
    

    public void setAttributeList(Map<Integer, HashMap<Integer, String>> attributeList) 
        helpViewList = attributeList;
    

【问题讨论】：

cloneInContext 要求什么？你到底想达到什么目标？

要为您自己的视图创建一个带有附加 LayoutInflater.Factory 的新 LayoutInflater，您可以使用 cloneInContext(Context) 克隆现有的 ViewFactory，然后在其上调用 setFactory(LayoutInflater.Factory) 以包含你的工厂。

您是否使用支持库中的片段？你确定 Fragment#onCreateView 被调用了吗？

你必须有适当的来源（与 buildToolsVersion 相同的版本）

如果您尝试使用支持库，为什么不使用LayoutInflaterCompat 和LayoutInflaterFactory 而不是LayoutInflater.Factory？

【参考方案1】：

修改后的答案：

为了解决这个问题，我们应该使用 LayoutInflaterCompat.setFactory，它有助于在 Lollipop 前后使用 LayoutInflater Factory。

这是一个例子

    LayoutInflater layoutInflaterCopy = inflater.cloneInContext(inflater.getContext());
    LayoutInflaterCompat.setFactory(layoutInflaterCopy, new LayoutInflaterFactory() 

        @Override
        public View onCreateView(View parent, String name, Context context, AttributeSet attrs) 
            String id = attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "id");

            if(id != null)
                // String with the reference character "@", so we strip it to keep only the reference
                id = id.replace("@", "");

                TypedArray libraryStyledAttributeList = context.obtainStyledAttributes(attrs, R.styleable.Help);
                HashMap<Integer, String> libraryViewAttribute = new HashMap<Integer, String>();
                int i = 0;

                for(int attribute : R.styleable.Help)
                    String attributeValue = null;
                    if (attribute == R.styleable.Help_arrow || attribute == R.styleable.Help_padding) 
                        attributeValue = String.valueOf(libraryStyledAttributeList.getInteger(i, 0));
                    
                    else 
                        attributeValue = libraryStyledAttributeList.getString(i);
                    

                    if(attributeValue != null)
                        libraryViewAttribute.put(attribute, attributeValue);

                    i++;
                

                if(!libraryViewAttribute.isEmpty()) 
                    helpViewList.put(Integer.valueOf(id), libraryViewAttribute);
                

                libraryStyledAttributeList.recycle();
            
            return null;
        
    );

    final View v = layoutInflaterCopy.inflate(layoutResourceId, null);

【参考方案2】：

AppCompat v23 已接受的答案已过时，请查看sdk\sources\android-23\android\support\v4\view\LayoutInflaterCompatHC.java 的来源，了解LayoutInflater.Factory 问题在forceSetFactory2 方法中是如何解决的。