android中调用c++文件并转为so

1、新建项目，不选include support c++

2、新建文件夹cpp，将.cpp文件放入其中；

3、编写jni接口文件，注意文件内函数名称前缀要与app下的build.gradle的applicationId保持一致；

4、编写CMakeLists.txt，在view->tool windows->gradle->build生成.so文件

编译时遇到的错误

（1）Error:Execution failed for task ‘:app:transformClassesWithDexForDebug‘.

> com.android.build.api.transform.TransformException: java.lang.RuntimeException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process ‘command ‘C:\Program Files\Java\jdk1.7.0_67\bin\java.exe‘‘ finished with non-zero exit value 1

     解决办法：在app下的builder.gradle 下添加 defaultConfig {
       .....       
        multiDexEnabled true
        .....
         }

  （2）Execution failed for task ‘:excelSior:packageAllDebugClassesForMultiDex‘. > java.util.zip.ZipException: duplicate entry: android/support/v4/util/TimeUtils.class

   解决办法：在app下的build.gradle下添加：

   android{ configurations { all*.exclude group: ‘com.android.support‘, module: ‘support-v4‘ all*.exclude group: ‘com.android.support‘, module: ‘support-annotations‘ } }

  参考：https://stackoverflow.com/questions/26966843/java-util-zip-zipexception-duplicate-entry-during-packagealldebugclassesformult