support no child view

Author: andyxialm

README.md

@@ -1,6 +1,6 @@
 #MultiStateLayout
 [![](https://jitpack.io/v/andyxialm/MultiStateLayout.svg)](https://jitpack.io/#andyxialm/MultiStateLayout)
-<a href="http://www.methodscount.com/?lib=com.github.andyxialm%3AMultiStateLayout%3A0.0.1"><img src="https://img.shields.io/badge/Methods count-core: 60 | deps: 32-e91e63.svg"/></a>
+<a href="http://www.methodscount.com/?lib=com.github.andyxialm%3AMultiStateLayout%3A0.0.2"><img src="https://img.shields.io/badge/Methods count-core: 60 | deps: 32-e91e63.svg"/></a>
 
 A customize multiple state layout for Android.
 
@@ -21,7 +21,7 @@ allprojects {
 ##### Step 2. Add the dependency
 ~~~ xml
 dependencies {
-    compile 'com.github.andyxialm:MultiStateLayout:0.0.1'
+    compile 'com.github.andyxialm:MultiStateLayout:0.0.2'
 }
 ~~~
 
@@ -41,7 +41,7 @@ dependencies {
 <dependency>
     <groupId>com.github.andyxialm</groupId>
     <artifactId>MultiStateLayout</artifactId>
-    <version>0.0.1</version>
+    <version>0.0.2</version>
 </dependency>
 ~~~
 

multistatelayout/src/main/java/cn/refactor/multistatelayout/MultiStateLayout.java

@@ -98,8 +98,11 @@ protected void onFinishInflate() {
 
         if (getChildCount() > 1) {
             throw new IllegalStateException("Expect to have one child.");
+        } else if (getChildCount() == 1) {
+            mContentView = getChildAt(CONTENT);
+        } else {
+            mContentView = null;
         }
-        mContentView = getChildAt(CONTENT);
     }
 
     /**
@@ -351,7 +354,9 @@ private void showViewByState(@State int state) {
      * show content view
      */
     private void showContentView() {
-        mContentView.setVisibility(VISIBLE);
+        if (null != mContentView) {
+            mContentView.setVisibility(VISIBLE);
+        }
     }
 
     /**