Binary XML file line : Error inflating class 错误分析

Binary XML file #33 in com.xxx.xxx/activity_main:Error inflating class view

从源码上分析一下这个错误的原因：

先看下这个错误抛出异常的代码
final InflateException ie = new InflateException(attrs.getPositionDescription()+ ": Error inflating class " + name, e);

attrs.getPositionDescription()的解释如下：
Returns a description of the current position of the attribute set.For instance, if the attribute set is loaded from an XML document,the position description could indicate the current line number.
return A string representation of the current position in the set,
may be null.

情况分析：
这个错误的大部分情况会在res文件夹下抛出，加载布局文件一般是setContentView或者inflate ，都会调用inflate方法

public View inflate(@LayoutRes int resource, @Nullable ViewGroup root) {return inflate(resource, root, root != null);
}

inflate中会调用私有的inflate方法，这个方法中会加载资源，并获得XmlResourceParser，一个xml解析器

public View inflate(@LayoutRes int resource, @Nullable ViewGroup root, boolean attachToRoot) {final Resources res = getContext().getResources();if (DEBUG) {Log.d(TAG, "INFLATING from resource: \"" + res.getResourceName(resource) + "\" ("+ Integer.toHexString(resource) + ")");}final XmlResourceParser parser = res.getLayout(resource);try {return inflate(parser, root, attachToRoot);} finally {parser.close();}}

接下来在inflate方法中会调用

final View temp = createViewFromTag(root, name, inflaterContext, attrs);

最终createViewFromTag方法，可以看到是在加载一些属性或者资源文件的时候可能抛出异常

* Creates a view from a tag name using the supplied attribute set.
* <p>
* <strong>Note:</strong> Default visibility so the BridgeInflater can
* override it.
*
* @param parent the parent view, used to inflate layout params
* @param name the name of the XML tag used to define the view
* @param context the inflation context for the view, typically the
*                {@code parent} or base layout inflater context
* @param attrs the attribute set for the XML tag used to define the view
* @param ignoreThemeAttr {@code true} to ignore the {@code android:theme}
*                        attribute (if set) for the view being inflated,
*                        {@code false} otherwiseView createViewFromTag(View parent, String name, Context context, AttributeSet attrs,boolean ignoreThemeAttr) {if (name.equals("view")) {name = attrs.getAttributeValue(null, "class");}// Apply a theme wrapper, if allowed and one is specified.if (!ignoreThemeAttr) {final TypedArray ta = context.obtainStyledAttributes(attrs, ATTRS_THEME);final int themeResId = ta.getResourceId(0, 0);if (themeResId != 0) {context = new ContextThemeWrapper(context, themeResId);}ta.recycle();}if (name.equals(TAG_1995)) {// Let's party like it's 1995!return new BlinkLayout(context, attrs);}try {View view;if (mFactory2 != null) {view = mFactory2.onCreateView(parent, name, context, attrs);} else if (mFactory != null) {view = mFactory.onCreateView(name, context, attrs);} else {view = null;}if (view == null && mPrivateFactory != null) {view = mPrivateFactory.onCreateView(parent, name, context, attrs);}if (view == null) {final Object lastContext = mConstructorArgs[0];mConstructorArgs[0] = context;try {if (-1 == name.indexOf('.')) {view = onCreateView(parent, name, attrs);} else {view = createView(name, null, attrs);}} finally {mConstructorArgs[0] = lastContext;}}return view;} catch (InflateException e) {throw e;} catch (ClassNotFoundException e) {final InflateException ie = new InflateException(attrs.getPositionDescription()+ ": Error inflating class " + name, e);ie.setStackTrace(EMPTY_STACK_TRACE);throw ie;} catch (Exception e) {final InflateException ie = new InflateException(attrs.getPositionDescription()+ ": Error inflating class " + name, e);ie.setStackTrace(EMPTY_STACK_TRACE);throw ie;}}

所以这个遇到这个错误还是要好好检查你的属性或者资源文件
补充
setContentView方法调用inflate

public void setContentView(int resId) {this.ensureSubDecor();ViewGroup contentParent = (ViewGroup)this.mSubDecor.findViewById(16908290);contentParent.removeAllViews();LayoutInflater.from(this.mContext).inflate(resId, contentParent);this.mOriginalWindowCallback.onContentChanged();
}

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