android 项目一导入support v4 包就报错

Question

报错信息如下，确认布局问题没有问题，support v4 jar包以导入：
Process: com.example.demo, PID: 32542
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.demo/com.example.demo.MainActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.v4.widget.DrawerLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2356)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2418)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5289)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.v4.widget.DrawerLayout
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:757)
at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:429)
at android.app.Activity.setContentView(Activity.java:2145)
at com.example.demo.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2309)
... 10 more
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.widget.DrawerLayout" on path: DexPathList[[zip file "/data/app/com.example.demo-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

Answer 1

已解决这个问题，下载了所有的sdk tools 就好了

Answer 2

个人觉得出现这种情况可能会有多种情况：

1. 你的资源文件中对android support包种的控件的引用有问题，在这里，极有可能是你的drawerlayout在引用的时候出现了问题，请仔细检查。
2. 其他资源的引用问题，包括图片资源。

如果还是不行，参看这个blog：http://blog.csdn.net/huangxiaohu_coder/article/details/8497286