主要原因是编译的classpath未加入v4和v7库
javah -d jni -classpath E:\Android\android-sdk\platforms\android-23\android.jar;E:\Android\android-sdk\extras\android\support\v4\android-support-v4.jar;E:\Android\android-sdk\extras\android\support\v7\appcompat\libs\android-support-v7-appcompat.jar;..\..\build\intermediates\classes\debug com.example.myapplication.MainActivity
有点长....
