public View inflate(XmlPullParser parser, @Nullable ViewGroup root, boolean attachToRoot)

public class InflateAdapter extends BaseAdapter {
    private LayoutInflater mInflater = null;   public InflateAdapter(Context context) {
        mInflater = LayoutInflater.from(context);
  }
    @Override
  public int getCount() {
        return 8;
  }
    @Override
  public Object getItem(int position) {
        return null;
  }
    @Override
  public long getItemId(int position) {
        return 0;
  }
    @Override
  public View getView(int position, View convertView, ViewGroup parent) {
        //说明：这里是测试inflate方法参数代码，不再考虑性能优化等TAG处理
  return getXmlToView(convertView, position, parent);
  }
    private View getXmlToView(View convertView, int position, ViewGroup parent) {
        View[] viewList = {
                mInflater.inflate(R.layout.textview_layout, null),
  mInflater.inflate(R.layout.textview_layout, parent, false),
  //mInflater.inflate(R.layout.textview_layout, parent, true),
  mInflater.inflate(R.layout.textview_layout, null, true),
  mInflater.inflate(R.layout.textview_layout, null, false),      mInflater.inflate(R.layout.textview_layout_parent, null),
  mInflater.inflate(R.layout.textview_layout_parent, parent, false),
  //mInflater.inflate(R.layout.textview_layout_parent, parent, true),
  mInflater.inflate(R.layout.textview_layout_parent, null, true),
  mInflater.inflate(R.layout.textview_layout_parent, null, false),
  };    //会抛出Caused by: java.lang.UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView
  convertView = viewList[position];   return convertView;
  }

public View inflate(XmlPullParser parser, @Nullable ViewGroup root, boolean attachToRoot) {
        synchronized (mConstructorArgs) {
            Trace.traceBegin(Trace.TRACE_TAG_VIEW, "inflate");
            final Context inflaterContext = mContext;				   				
			//这里是丛XML解析属性
			final AttributeSet attrs = Xml.asAttributeSet(parser);
            Context lastContext = (Context) mConstructorArgs[0];
            mConstructorArgs[0] = inflaterContext;
            View result = root;
            try {
                // Look for the root node.
                int type;
                while ((type = parser.next()) != XmlPullParser.START_TAG &&
                        type != XmlPullParser.END_DOCUMENT) {
                    // Empty
                }				
				//如果不是根结点的话就抛出异常
                if (type != XmlPullParser.START_TAG) {
                    throw new InflateException(parser.getPositionDescription()
                            + ": No start tag found!");
                }
                final String name = parser.getName();
				//这里判断的是Merge标签。用Merge的时候根布局不能为null且attachToRoot不能为false
                if (TAG_MERGE.equals(name)) {
                    if (root == null || !attachToRoot) {
                        throw new InflateException("<merge /> can be used only with a valid "
                                + "ViewGroup root and attachToRoot=true");
                    }
                    rInflate(parser, root, inflaterContext, attrs, false);
                } else {
                    // Temp is the root view that was found in the xml
                    final View temp = createViewFromTag(root, name, inflaterContext, attrs);
                    ViewGroup.LayoutParams params = null;
			
                    if (root != null) {
                        if (DEBUG) {
                            System.out.println("Creating params from root: " +
                                    root);
                        }
                        // Create layout params that match root, if supplied
                        params = root.generateLayoutParams(attrs);
						//这里可以看出只有root不为null且attachToRoot为false的时候，temp才会设置它自己的LayoutParams
                        if (!attachToRoot) {
                            // Set the layout params for temp if we are not
                            // attaching. (If we are, we use addView, below)
                            temp.setLayoutParams(params);
                        }
                    }
                    // Inflate all children under temp against its context.
                    rInflateChildren(parser, temp, attrs, true);
                    }
                    // We are supposed to attach all the views we found (int temp)
                    // to root. Do that now.
					//这里可以看出root不为null且attachToRoot为true的时候执行了一次addView
                    if (root != null && attachToRoot) {
                        root.addView(temp, params);
                    }
                    // Decide whether to return the root that was passed in or the
                    // top view found in xml.
                    if (root == null || !attachToRoot) {
                        result = temp;
                    }
                }
			//最终会把view返回
            return result;
        }
    }

/**
 * This method is not supported and throws an UnsupportedOperationException when called. * * @param child Ignored.
 * * @throws UnsupportedOperationException Every time this method is invoked.
 */ 
@Override 
public void addView(View child) {
    throw new UnsupportedOperationException("addView(View) is not supported in AdapterView"); 
}