我们知道，Eclipse工程的目录结构跟Android Studio的有很大的不同，采用Android Studio的导入Eclipse工程方法，却也会导致原本的目录结构改变。如果想要用Android Studio编译Eclipse工程，但却不想改变原本的目录结构，那么，只需要Eclipse工程的根目录下，新建一个build.gradle，更改下studio默认的工程目录即可。具体做法如下：

• 1.在根目录创建一个build.gradle,对当前工程（模块）进行配置.

      // Top-level build file where you can add configuration options common to all sub-projects/modules.

      buildscript {
          repositories {
              jcenter()
          }
      dependencies {
          classpath 'com.android.tools.build:gradle:2.0.0'

          // NOTE: Do not place your application dependencies here; they   belong
          // in the individual module build.gradle files
        }
      }

      allprojects {
          repositories {
              jcenter()
          }
      }

      task clean(type: Delete) {
          delete rootProject.buildDir
      }

      //this is module build.gradle
       apply plugin: 'com.android.application'

      android {
          compileSdkVersion 23
          buildToolsVersion "23.0.2"

          defaultConfig {
              applicationId "com.example.eclipse2studio"
              versionCode 1
              versionName "1.0"
          }

          packagingOptions {
              exclude 'META-INF/NOTICE.txt'
              exclude 'META-INF/LICENSE.txt'
          }

          sourceSets {
              main {
                 manifest.srcFile 'AndroidManifest.xml'
                  aidl.srcDirs = ['src']
                  java.srcDirs = ['src']
                  resources.srcDirs = ['src']
                  res.srcDirs = ['res']
                  assets.srcDirs = ['assets']
                  jniLibs.srcDirs = ['libs']
                  renderscript.srcDirs = ['src']
              }
       // Move the tests to tests/java, tests/res, etc...
        instrumentTest.setRoot('tests')

        // Move the build types to build-types/<type>
        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
        // This moves them out of them default location under src/<type>/... which would
        // conflict with src/ being used by the main source set.
        // Adding new build types or product flavors should be accompanied
        // by a similar customization.
        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
          }
      }

      //signHelper.setNeedSign()
      dependencies {
          //compile fileTree(dir: 'libs', include: ['*.jar'])
          compile 'com.android.support:appcompat-v7:23.2.0' exclude module: 'support-v4'
          compile files('../libs/bugly_crash_upgrade_v1.1.2.jar')
          compile project(':lib01')
          compile (project(':lib02')) {   
                 exclude module: 'support-v4'
            }
      }

注：关键的代码部分是sourceSets部分，该部分就将studio的目录结构更改为跟eclipse的相匹配，路径都是相对应该build.gradle的。

• 2.如果该工程还加载了其他工程作为库文件，那么则要在工程根目录下创建一个settings.gradle，来对库工程进行配置。

include ':lib01'
project(':lib01').projectDir = new File('../lib01')
include ':lib02'
project(':lib02').projectDir = new File('E:/android/lib02')

经过以上步骤，eclipse工程就已经顺利转换程Android Studio工程了，同时，它也仍然还是eclipse工程。

更多详细配置，请参考官方文档